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source: palm/trunk/SOURCE/init_grid.f90 @ 2284

Last change on this file since 2284 was 2274, checked in by Giersch, 8 years ago
Changed error messages
Property svn:keywords set to `Id`
File size: 84.7 KB

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[1682]	1	!> @file init_grid.f90
[2000]	2	!------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
[2000]	5	! PALM is free software: you can redistribute it and/or modify it under the
	6	! terms of the GNU General Public License as published by the Free Software
	7	! Foundation, either version 3 of the License, or (at your option) any later
	8	! version.
[1036]	9	!
	10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	13	!
	14	! You should have received a copy of the GNU General Public License along with
	15	! PALM. If not, see <http://www.gnu.org/licenses/>.
	16	!
[2101]	17	! Copyright 1997-2017 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[254]	20	! Current revisions:
[1]	21	! -----------------
[2233]	22	!
	23	!
	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 2274 2017-06-09 13:27:48Z witha $
[2274]	27	! Changed error messages
	28	!
	29	! 2233 2017-05-30 18:08:54Z suehring
[2233]	30	!
	31	! 2232 2017-05-30 17:47:52Z suehring
[2232]	32	! - Adjustments according to new topography representation
	33	! - Bugfix: Move determination of nzb_max behind topography modification in
	34	! cell-edge case
	35	! - Get rid off global arrays required for topography output
	36	! - Enable topography input via netcdf
	37	! - Generic tunnel set-up added
[1969]	38	!
[2201]	39	! 2200 2017-04-11 11:37:51Z suehring
	40	! monotonic_adjustment removed
	41	!
[2170]	42	! 2169 2017-03-06 18:16:35Z suehring
	43	! Bugfix, move setting for topography grid convention to init_grid, else, if no
	44	! value is set, the simulation may abort in case of restarts
	45	!
[2129]	46	! 2128 2017-01-23 15:00:03Z suehring
	47	! Bugfix in setting topography from file in case of ocean simulations
	48	!
[2089]	49	! 2088 2016-12-19 16:30:25Z suehring
	50	! Bugfix in generic topography in case of ocean simulations
	51	!
[2038]	52	! 2037 2016-10-26 11:15:40Z knoop
	53	! Anelastic approximation implemented
	54	!
[2022]	55	! 2021 2016-10-07 14:08:57Z suehring
	56	! Bugfix: setting Neumann boundary conditions for topography required for
	57	! topography flags in multigrid_noopt solver
	58	!
[2001]	59	! 2000 2016-08-20 18:09:15Z knoop
	60	! Forced header and separation lines into 80 columns
	61	!
[1995]	62	! 1994 2016-08-15 09:52:21Z suehring
	63	! Bugfix in definition of generic topography
	64	!
[1983]	65	! 1982 2016-08-01 11:04:48Z suehring
	66	! Bugfix concering consistency check for topography
	67	!
[1969]	68	! 1968 2016-07-18 12:01:49Z suehring
[1968]	69	! Changed: PE-wise reading of topography file in order to avoid global definition
	70	! of arrays nzb_local and nzb_tmp. Thereby, topography definition for single
	71	! buildings and street canyons has changed, as well as flag setting for
	72	! multigrid scheme.
	73	!
	74	! Bugfix in checking l_grid anisotropy.
	75	! Simplify initial computation of lwall and vertical_influence, i.e. remove
	76	! nzb_s_inner as it is still zero at this point.
[1932]	77	!
[1943]	78	! 1942 2016-06-14 12:18:18Z suehring
	79	! Topography filter implemented to fill holes resolved by only one grid point.
	80	! Initialization of flags for ws-scheme moved to advec_ws.
	81	!
[1932]	82	! 1931 2016-06-10 12:06:59Z suehring
	83	! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid
	84	!
[1911]	85	! 1910 2016-05-26 06:49:46Z raasch
	86	! Bugfix: if topography is read from file, Neumann conditions are used for the
	87	! nzb_local array (instead of cyclic conditions) in case that non-cyclic
	88	! boundary conditions are switched on for the run
	89	!
[1903]	90	! 1902 2016-05-09 11:18:56Z suehring
[1910]	91	! Set topography flags for multigrid solver only (not for multigrid_fast)
[1903]	92	!
[1887]	93	! 1886 2016-04-21 11:20:47Z suehring
	94	! Bugfix: setting advection flags near walls
	95	! reformulated index values for nzb_v_inner
	96	! variable discriptions added in declaration block
	97	!
[1846]	98	! 1845 2016-04-08 08:29:13Z raasch
	99	! nzb_2d removed
	100	!
[1805]	101	! 1804 2016-04-05 16:30:18Z maronga
	102	! Removed code for parameter file check (__check)
	103	!
[1780]	104	! 1779 2016-03-03 08:01:28Z raasch
	105	! coupling_char is trimmed at every place it occurs, because it can have
	106	! different length now
	107	!
[1763]	108	! 1762 2016-02-25 12:31:13Z hellstea
	109	! Introduction of nested domain feature
	110	!
[1744]	111	! 1743 2016-01-13 10:23:51Z raasch
	112	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	113	! total domain
	114	!
[1692]	115	! 1691 2015-10-26 16:17:44Z maronga
	116	! Renamed prandtl_layer to constant_flux_layer.
	117	!
[1683]	118	! 1682 2015-10-07 23:56:08Z knoop
	119	! Code annotations made doxygen readable
	120	!
[1678]	121	! 1677 2015-10-02 13:25:23Z boeske
	122	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	123	!
[1676]	124	! 1675 2015-10-02 08:28:59Z gronemeier
	125	! Bugfix: Definition of topography grid levels
	126	!
[1662]	127	! 1660 2015-09-21 08:15:16Z gronemeier
	128	! Bugfix: Definition of topography grid levels if vertical grid stretching
	129	! starts below the maximum topography height.
	130	!
[1581]	131	! 1580 2015-04-10 13:43:49Z suehring
	132	! Bugfix: setting flags for 5th order scheme near buildings
	133	!
[1576]	134	! 1575 2015-03-27 09:56:27Z raasch
	135	! adjustments for psolver-queries
	136	!
[1558]	137	! 1557 2015-03-05 16:43:04Z suehring
	138	! Adjustment for monotoinic limiter
	139	!
[1419]	140	! 1418 2014-06-06 13:05:08Z fricke
	141	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	142	! condition and a negative value for dz_stretch_level the condition
	143	! was always true for the whole model domain
	144	!
[1410]	145	! 1409 2014-05-23 12:11:32Z suehring
	146	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	147	! j <= nysv
	148	!
[1354]	149	! 1353 2014-04-08 15:21:23Z heinze
	150	! REAL constants provided with KIND-attribute
	151	!
[1323]	152	! 1322 2014-03-20 16:38:49Z raasch
	153	! REAL constants defined as wp-kind
	154	!
[1321]	155	! 1320 2014-03-20 08:40:49Z raasch
[1320]	156	! ONLY-attribute added to USE-statements,
	157	! kind-parameters added to all INTEGER and REAL declaration statements,
	158	! kinds are defined in new module kinds,
	159	! revision history before 2012 removed,
	160	! comment fields (!:) to be used for variable explanations added to
	161	! all variable declaration statements
[1321]	162	!
[1222]	163	! 1221 2013-09-10 08:59:13Z raasch
	164	! wall_flags_00 introduced to hold bits 32-63,
	165	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	166	! loops optimized for openACC (pres + flow_statistics)
	167	!
[1093]	168	! 1092 2013-02-02 11:24:22Z raasch
	169	! unused variables removed
	170	!
[1070]	171	! 1069 2012-11-28 16:18:43Z maronga
[1779]	172	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	173	! ocean model in case of coupled runs
[1070]	174	!
[1037]	175	! 1036 2012-10-22 13:43:42Z raasch
	176	! code put under GPL (PALM 3.9)
	177	!
[1017]	178	! 1015 2012-09-27 09:23:24Z raasch
	179	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	180	! nzb_w_inner+1
	181	!
[997]	182	! 996 2012-09-07 10:41:47Z raasch
	183	! little reformatting
	184	!
[979]	185	! 978 2012-08-09 08:28:32Z fricke
	186	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	187	! Bugfix: Set wall_flags_0 for inflow boundary
	188	!
[928]	189	! 927 2012-06-06 19:15:04Z raasch
	190	! Wall flags are not set for multigrid method in case of masking method
	191	!
[865]	192	! 864 2012-03-27 15:10:33Z gryschka
[927]	193	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	194	! were not correctly defined for k=1.
[865]	195	!
[863]	196	! 861 2012-03-26 14:18:34Z suehring
[861]	197	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	198	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	199	! model domain.!
[861]	200	! Initialization of nzb_s_inner and nzb_w_inner.
	201	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	202	! while setting wall_flags_0
	203	!
[844]	204	! 843 2012-02-29 15:16:21Z gryschka
	205	! In case of ocean and dirichlet bc for u and v at the bottom
	206	! the first u-level ist defined at same height as the first w-level
	207	!
[819]	208	! 818 2012-02-08 16:11:23Z maronga
	209	! Bugfix: topo_height is only required if topography is used. It is thus now
	210	! allocated in the topography branch
	211	!
[810]	212	! 809 2012-01-30 13:32:58Z maronga
	213	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	214	!
[808]	215	! 807 2012-01-25 11:53:51Z maronga
	216	! New cpp directive "__check" implemented which is used by check_namelist_files
	217	!
[1]	218	! Revision 1.1 1997/08/11 06:17:45 raasch
	219	! Initial revision (Testversion)
	220	!
	221	!
	222	! Description:
	223	! ------------
[1682]	224	!> Creating grid depending constants
[2232]	225	!> To Do: Setting topo flags only based on topo_3d array - flags for former
	226	!> nzb_outer arrays are still not set properly.
	227	!> To Do: Rearrange topo flag list
[1]	228	!------------------------------------------------------------------------------!
[1682]	229	SUBROUTINE init_grid
	230
[1942]	231	USE advec_ws, &
	232	ONLY: ws_init_flags
[1]	233
[1320]	234	USE arrays_3d, &
	235	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	236	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	237
[1353]	238	USE control_parameters, &
[1910]	239	ONLY: bc_lr_cyc, bc_ns_cyc, building_height, building_length_x, &
[1320]	240	building_length_y, building_wall_left, building_wall_south, &
	241	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	242	canyon_width_x, canyon_width_y, constant_flux_layer, &
	243	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
[1968]	244	dz_stretch_level, dz_stretch_level_index, grid_level, ibc_uv_b, &
	245	io_blocks, io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
[2232]	246	lod, masking_method, maximum_grid_level, message_string, &
[2021]	247	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	248	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
[1762]	249	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[2232]	250	topography_grid_convention, tunnel_height, tunnel_length, &
	251	tunnel_width_x, tunnel_width_y, tunnel_wall_depth, &
	252	use_surface_fluxes, use_top_fluxes, wall_adjustment_factor
[2021]	253
[1320]	254	USE grid_variables, &
[2232]	255	ONLY: ddx, ddx2, ddy, ddy2, dx, dx2, dy, dy2, zu_s_inner, zw_w_inner
[1320]	256
	257	USE indices, &
[2232]	258	ONLY: advc_flags_1, advc_flags_2, flags, nbgp, nx, nxl, nxlg, nxl_mg, &
	259	nxr, nxrg, nxr_mg, ny, nyn, nyng, nyn_mg, nys, nys_mg, nysg, nz,&
	260	nzb, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	261	nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
[1845]	262	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
[2232]	263	nzb_w_outer, nzt, nzt_mg, wall_flags_0, wall_flags_1, &
[1320]	264	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	265	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	266	wall_flags_9
	267
	268	USE kinds
[2232]	269	#if defined ( __netcdf )
	270	USE netcdf_interface, &
	271	ONLY: netcdf_close_file, netcdf_open_read_file, netcdf_get_attribute, &
	272	netcdf_get_variable
	273	#endif
[1]	274	USE pegrid
	275
[2232]	276	USE surface_mod, &
	277	ONLY: init_bc
	278
[1]	279	IMPLICIT NONE
	280
[1968]	281	INTEGER(iwp) :: bh !< temporary vertical index of building height
	282	INTEGER(iwp) :: blx !< grid point number of building size along x
	283	INTEGER(iwp) :: bly !< grid point number of building size along y
	284	INTEGER(iwp) :: bxl !< index for left building wall
	285	INTEGER(iwp) :: bxr !< index for right building wall
	286	INTEGER(iwp) :: byn !< index for north building wall
	287	INTEGER(iwp) :: bys !< index for south building wall
	288	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
	289	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
	290	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
	291	INTEGER(iwp) :: cxl !< index for left canyon wall
	292	INTEGER(iwp) :: cxr !< index for right canyon wall
	293	INTEGER(iwp) :: cyn !< index for north canyon wall
	294	INTEGER(iwp) :: cys !< index for south canyon wall
	295	INTEGER(iwp) :: i !< index variable along x
[2232]	296	INTEGER(iwp) :: id_topo !< NetCDF id of topograhy input file
[1968]	297	INTEGER(iwp) :: ii !< loop variable for reading topography file
	298	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
	299	INTEGER(iwp) :: j !< index variable along y
	300	INTEGER(iwp) :: k !< index variable along z
[2232]	301	INTEGER(iwp) :: k_top !< topography top index on local PE
[1968]	302	INTEGER(iwp) :: l !< loop variable
	303	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
	304	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
	305	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
	306	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
	307	INTEGER(iwp) :: nzb_local_max !< vertical grid index of maximum topography height
	308	INTEGER(iwp) :: nzb_local_min !< vertical grid index of minimum topography height
	309	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
	310	INTEGER(iwp) :: num_hole !< number of holes (in topography) resolved by only one grid point
	311	INTEGER(iwp) :: num_hole_l !< number of holes (in topography) resolved by only one grid point on local PE
	312	INTEGER(iwp) :: num_wall !< number of surrounding vertical walls for a single grid point
	313	INTEGER(iwp) :: skip_n_rows !< counting variable to skip rows while reading topography file
[2232]	314	INTEGER(iwp) :: hv_in !< heavyside function to model inner tunnel surface
	315	INTEGER(iwp) :: hv_out !< heavyside function to model outer tunnel surface
	316	INTEGER(iwp) :: txe_out !< end position of outer tunnel wall in x
	317	INTEGER(iwp) :: txs_out !< start position of outer tunnel wall in x
	318	INTEGER(iwp) :: tye_out !< end position of outer tunnel wall in y
	319	INTEGER(iwp) :: tys_out !< start position of outer tunnel wall in y
	320	INTEGER(iwp) :: txe_in !< end position of inner tunnel wall in x
	321	INTEGER(iwp) :: txs_in !< start position of inner tunnel wall in x
	322	INTEGER(iwp) :: tye_in !< end position of inner tunnel wall in y
	323	INTEGER(iwp) :: tys_in !< start position of inner tunnel wall in y
	324	INTEGER(iwp) :: td !< tunnel wall depth
	325	INTEGER(iwp) :: th !< height of outer tunnel wall
	326
[1968]	327	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography top at cell-center
	328	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate topography indices on u- and v-grid
[1]	329
[2232]	330	INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE :: topo_3d !< input array for 3D topography and dummy array for setting "outer"-flags
	331
	332	LOGICAL :: netcdf_extend = .FALSE. !< Flag indicating wether netcdf topography input file or not
	333
[1968]	334	REAL(wp) :: dum !< dummy variable to skip columns while reading topography file
[1886]	335	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
[861]	336
[2232]	337	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: oro_height !< input variable for terrain height
[1968]	338	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for topography height
[1]	339
	340	!
[709]	341	!-- Calculation of horizontal array bounds including ghost layers
[667]	342	nxlg = nxl - nbgp
	343	nxrg = nxr + nbgp
	344	nysg = nys - nbgp
	345	nyng = nyn + nbgp
[709]	346
[667]	347	!
[1]	348	!-- Allocate grid arrays
[1353]	349	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	350	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	351
	352	!
	353	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	354	IF ( dz == -1.0_wp ) THEN
[254]	355	message_string = 'missing dz'
	356	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	357	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	358	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	359	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	360	ENDIF
[94]	361
[1]	362	!
[94]	363	!-- Define the vertical grid levels
	364	IF ( .NOT. ocean ) THEN
	365	!
	366	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	367	!-- The second u-level (k=1) corresponds to the top of the
[94]	368	!-- Prandtl-layer.
[667]	369
	370	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	371	zu(0) = 0.0_wp
	372	! zu(0) = - dz * 0.5_wp
[667]	373	ELSE
[1353]	374	zu(0) = - dz * 0.5_wp
[667]	375	ENDIF
[1353]	376	zu(1) = dz * 0.5_wp
[1]	377
[94]	378	dz_stretch_level_index = nzt+1
	379	dz_stretched = dz
	380	DO k = 2, nzt+1
	381	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	382	dz_stretched = dz_stretched * dz_stretch_factor
	383	dz_stretched = MIN( dz_stretched, dz_max )
	384	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	385	ENDIF
	386	zu(k) = zu(k-1) + dz_stretched
	387	ENDDO
[1]	388
	389	!
[94]	390	!-- Compute the w-levels. They are always staggered half-way between the
[843]	391	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	392	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	393	!-- The top w-level is extrapolated linearly.
[1353]	394	zw(0) = 0.0_wp
[94]	395	DO k = 1, nzt
[1353]	396	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	397	ENDDO
[1353]	398	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	399
[94]	400	ELSE
[1]	401	!
[843]	402	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	403	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	404	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	405	!-- w-level are defined at same height, but staggered from the second level.
	406	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	407	zu(nzt+1) = dz * 0.5_wp
	408	zu(nzt) = - dz * 0.5_wp
[94]	409
	410	dz_stretch_level_index = 0
	411	dz_stretched = dz
	412	DO k = nzt-1, 0, -1
[1418]	413	!
	414	!-- The default value of dz_stretch_level is positive, thus the first
	415	!-- condition is always true. Hence, the second condition is necessary.
	416	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	417	.AND. dz_stretched < dz_max ) THEN
[94]	418	dz_stretched = dz_stretched * dz_stretch_factor
	419	dz_stretched = MIN( dz_stretched, dz_max )
	420	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	421	ENDIF
	422	zu(k) = zu(k+1) - dz_stretched
	423	ENDDO
	424
	425	!
	426	!-- Compute the w-levels. They are always staggered half-way between the
[843]	427	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	428	!-- at the ground. In this case the first u- and w-level are defined at
	429	!-- same height. The top w-level (nzt+1) is not used but set for
	430	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	431	zw(nzt+1) = dz
[1353]	432	zw(nzt) = 0.0_wp
[94]	433	DO k = 0, nzt
[1353]	434	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	435	ENDDO
	436
[843]	437	!
	438	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	439	!-- at same height.
	440	IF ( ibc_uv_b == 0 ) THEN
	441	zu(0) = zw(0)
	442	ENDIF
	443
[94]	444	ENDIF
	445
	446	!
[1]	447	!-- Compute grid lengths.
	448	DO k = 1, nzt+1
	449	dzu(k) = zu(k) - zu(k-1)
[1353]	450	ddzu(k) = 1.0_wp / dzu(k)
[1]	451	dzw(k) = zw(k) - zw(k-1)
[1353]	452	ddzw(k) = 1.0_wp / dzw(k)
[1]	453	ENDDO
	454
	455	DO k = 1, nzt
[1353]	456	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	457	ENDDO
[667]	458
	459	!
[709]	460	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	461	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	462	!-- is only dz/2, but should be dz. Therefore, an additional array
	463	!-- containing with appropriate grid information is created for these
	464	!-- solvers.
[1575]	465	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	466	ALLOCATE( ddzu_pres(1:nzt+1) )
	467	ddzu_pres = ddzu
[864]	468	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[1]	469	ENDIF
	470
	471	!
	472	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	473	ddx = 1.0_wp / dx
	474	ddy = 1.0_wp / dy
[1]	475	dx2 = dx * dx
	476	dy2 = dy * dy
[1353]	477	ddx2 = 1.0_wp / dx2
	478	ddy2 = 1.0_wp / dy2
[1]	479
	480	!
	481	!-- Compute the grid-dependent mixing length.
	482	DO k = 1, nzt
[1322]	483	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	484	ENDDO
	485
	486	!
	487	!-- Allocate outer and inner index arrays for topography and set
[2232]	488	!-- defaults.
	489	ALLOCATE( nzb_s_inner(nysg:nyng,nxlg:nxrg), &
[667]	490	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	491	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	492	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	493	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	494	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	495	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	496	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	497	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	498	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
[1968]	499	nzb_local(nysg:nyng,nxlg:nxrg), &
	500	nzb_tmp(nysg:nyng,nxlg:nxrg), &
[2232]	501	wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1]	502
[2232]	503	ALLOCATE( topo_3d(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	504	topo_3d = 0
[1]	505
[667]	506	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	507
[1]	508	nzb_s_inner = nzb; nzb_s_outer = nzb
	509	nzb_u_inner = nzb; nzb_u_outer = nzb
	510	nzb_v_inner = nzb; nzb_v_outer = nzb
	511	nzb_w_inner = nzb; nzb_w_outer = nzb
	512
	513	!
[19]	514	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	515	!-- form (which does not use surface fluxes) is applied
[1691]	516	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	517	nzb_diff = nzb + 2
	518	ELSE
	519	nzb_diff = nzb + 1
	520	ENDIF
	521
	522	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	523
	524	!
	525	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	526	!-- for the moment,
	527	!-- multiplication with wall_adjustment_factor near the end of this routine
	528	l_wall(nzb,:,:) = l_grid(1)
	529	DO k = nzb+1, nzt
	530	l_wall(k,:,:) = l_grid(k)
	531	ENDDO
	532	l_wall(nzt+1,:,:) = l_grid(nzt)
	533
	534	DO k = 1, nzt
[1353]	535	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	536	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	537	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	538	'threshold given by only local', &
	539	' &horizontal reduction of near_wall ', &
	540	'mixing length l_wall', &
	541	' &starting from height level k = ', k, '.'
	542	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	543	EXIT
	544	ENDIF
	545	ENDDO
	546	!
	547	!-- Set outer and inner index arrays for non-flat topography.
	548	!-- Here consistency checks concerning domain size and periodicity are
	549	!-- necessary.
	550	!-- Within this SELECT CASE structure only nzb_local is initialized
	551	!-- individually depending on the chosen topography type, all other index
	552	!-- arrays are initialized further below.
	553	SELECT CASE ( TRIM( topography ) )
	554
	555	CASE ( 'flat' )
	556	!
[555]	557	!-- nzb_local is required for the multigrid solver
	558	nzb_local = 0
[2232]	559	!
	560	!-- Initialilize 3D topography array, used later for initializing flags
	561	topo_3d(nzb+1:nzt+1,:,:) = IBSET( topo_3d(nzb+1:nzt+1,:,:), 0 )
	562	!
	563	!-- level of detail is required for output routines
	564	lod = 1
[1]	565
	566	CASE ( 'single_building' )
	567	!
	568	!-- Single rectangular building, by default centered in the middle of the
	569	!-- total domain
	570	blx = NINT( building_length_x / dx )
	571	bly = NINT( building_length_y / dy )
[2232]	572	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	573	IF ( ABS( zw(bh) - building_height ) == &
[1675]	574	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	575
[1322]	576	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	577	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	578	ENDIF
	579	bxl = NINT( building_wall_left / dx )
	580	bxr = bxl + blx
	581
[1322]	582	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	583	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	584	ENDIF
	585	bys = NINT( building_wall_south / dy )
	586	byn = bys + bly
	587
	588	!
	589	!-- Building size has to meet some requirements
	590	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	591	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	592	WRITE( message_string, * ) 'inconsistent building parameters:', &
	593	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	594	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	595	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	596	ENDIF
	597
	598	!
[1968]	599	!-- Define the building.
[1]	600	nzb_local = 0
[1968]	601	IF ( bxl <= nxr .AND. bxr >= nxl .AND. &
	602	bys <= nyn .AND. byn >= nys ) &
	603	nzb_local(MAX(nys,bys):MIN(nyn,byn),MAX(nxl,bxl):MIN(nxr,bxr)) = bh
[1]	604
[1994]	605	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
[2232]	606	!
	607	!-- Set bit array to mask topography
	608	DO i = nxlg, nxrg
	609	DO j = nysg, nyng
[1994]	610
[2232]	611	topo_3d(nzb_local(j,i)+1:nzt+1,j,i) = &
	612	IBSET( topo_3d(nzb_local(j,i)+1:nzt+1,j,i), 0 )
	613	ENDDO
	614	ENDDO
	615	!
	616	!-- level of detail is required for output routines. Here, 2D topography.
	617	lod = 1
	618
	619	CALL exchange_horiz_int( topo_3d, nbgp )
	620
[240]	621	CASE ( 'single_street_canyon' )
	622	!
	623	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	624	!-- The canyon is centered in the other direction by default.
[1322]	625	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	626	!
	627	!-- Street canyon in y direction
	628	cwx = NINT( canyon_width_x / dx )
[1322]	629	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	630	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	631	ENDIF
	632	cxl = NINT( canyon_wall_left / dx )
	633	cxr = cxl + cwx
	634
[1322]	635	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	636	!
	637	!-- Street canyon in x direction
	638	cwy = NINT( canyon_width_y / dy )
[1322]	639	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	640	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	641	ENDIF
	642	cys = NINT( canyon_wall_south / dy )
	643	cyn = cys + cwy
	644
	645	ELSE
[254]	646
	647	message_string = 'no street canyon width given'
	648	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	649
[240]	650	ENDIF
	651
[2232]	652	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	653	IF ( ABS( zw(ch) - canyon_height ) == &
[1675]	654	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	655
[240]	656	dp_level_ind_b = ch
	657	!
	658	!-- Street canyon size has to meet some requirements
[1322]	659	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	660	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	661	( ch < 3 ) ) THEN
[1353]	662	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	663	'&cxl=', cxl, 'cxr=', cxr, &
	664	'cwx=', cwx, &
[254]	665	'ch=', ch, 'nx=', nx, 'ny=', ny
	666	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	667	ENDIF
[1322]	668	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	669	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	670	( ch < 3 ) ) THEN
[1353]	671	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	672	'&cys=', cys, 'cyn=', cyn, &
	673	'cwy=', cwy, &
[254]	674	'ch=', ch, 'nx=', nx, 'ny=', ny
	675	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	676	ENDIF
	677	ENDIF
[1353]	678	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	679	canyon_width_y /= 9999999.9_wp ) THEN
	680	message_string = 'inconsistent canyon parameters:' // &
	681	'&street canyon can only be oriented' // &
[254]	682	'&either in x- or in y-direction'
	683	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	684	ENDIF
	685
	686	nzb_local = ch
[1322]	687	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1968]	688	IF ( cxl <= nxr .AND. cxr >= nxl ) &
	689	nzb_local(:,MAX(nxl,cxl+1):MIN(nxr,cxr-1)) = 0
[1322]	690	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1968]	691	IF ( cys <= nyn .AND. cyn >= nys ) &
	692	nzb_local(MAX(nys,cys+1):MIN(nyn,cyn-1),:) = 0
[240]	693	ENDIF
	694
[1994]	695	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
[2232]	696	!
	697	!-- Set bit array to mask topography
	698	DO i = nxlg, nxrg
	699	DO j = nysg, nyng
	700	topo_3d(nzb_local(j,i)+1:nzt+1,j,i) = &
	701	IBSET( topo_3d(nzb_local(j,i)+1:nzt+1,j,i), 0 )
	702	ENDDO
	703	ENDDO
	704	!
	705	!-- level of detail is required for output routines. Here, 2D topography.
	706	lod = 1
[1994]	707
[2232]	708	CALL exchange_horiz_int( topo_3d, nbgp )
	709
	710	CASE ( 'tunnel' )
	711
	712	!
	713	!-- Tunnel height
	714	IF ( tunnel_height == 9999999.9_wp ) THEN
	715	th = zw( INT( 0.2 * nz) )
	716	ELSE
	717	th = tunnel_height
	718	ENDIF
	719	!
	720	!-- Tunnel-wall depth
	721	IF ( tunnel_wall_depth == 9999999.9_wp ) THEN
	722	td = MAX ( dx, dy, dz )
	723	ELSE
	724	td = tunnel_wall_depth
	725	ENDIF
	726	!
	727	!-- Check for tunnel width
	728	IF ( tunnel_width_x == 9999999.9_wp .AND. &
	729	tunnel_width_y == 9999999.9_wp ) THEN
	730	message_string = 'No tunnel width is given. '
[2274]	731	CALL message( 'init_grid', 'PA0280', 1, 2, 0, 6, 0 )
[2232]	732	ENDIF
	733	IF ( tunnel_width_x /= 9999999.9_wp .AND. &
	734	tunnel_width_y /= 9999999.9_wp ) THEN
	735	message_string = 'Inconsistent tunnel parameters:' // &
	736	'tunnel can only be oriented' // &
	737	'either in x- or in y-direction.'
[2274]	738	CALL message( 'init_grid', 'PA0281', 1, 2, 0, 6, 0 )
[2232]	739	ENDIF
	740	!
	741	!-- Tunnel axis along y
	742	IF ( tunnel_width_x /= 9999999.9_wp ) THEN
	743	IF ( tunnel_width_x > ( nx + 1 ) * dx ) THEN
	744	message_string = 'Tunnel width too large'
[2274]	745	CALL message( 'init_grid', 'PA0282', 1, 2, 0, 6, 0 )
[2232]	746	ENDIF
	747
	748	txs_out = INT( ( nx + 1 ) * 0.5_wp * dx - tunnel_width_x * 0.5_wp )
	749	txe_out = INT( ( nx + 1 ) * 0.5_wp * dx + tunnel_width_x * 0.5_wp )
	750	txs_in = INT( ( nx + 1 ) * 0.5_wp * dx - &
	751	( tunnel_width_x * 0.5_wp - td ) )
	752	txe_in = INT( ( nx + 1 ) * 0.5_wp * dx + &
	753	( tunnel_width_x * 0.5_wp - td ) )
	754
	755	tys_out = INT( ( ny + 1 ) * 0.5_wp * dy - tunnel_length * 0.5_wp )
	756	tye_out = INT( ( ny + 1 ) * 0.5_wp * dy + tunnel_length * 0.5_wp )
	757	tys_in = tys_out
	758	tye_in = tye_out
	759	ENDIF
	760	IF ( tunnel_width_x /= 9999999.9_wp .AND. &
	761	tunnel_width_x - 2.0_wp * tunnel_wall_depth <= 2.0_wp * dx ) THEN
	762	message_string = 'Tunnel width too small'
[2274]	763	CALL message( 'init_grid', 'PA0175', 1, 2, 0, 6, 0 )
[2232]	764	ENDIF
	765	IF ( tunnel_width_y /= 9999999.9_wp .AND. &
	766	tunnel_width_y - 2.0_wp * tunnel_wall_depth <= 2.0_wp * dy ) THEN
	767	message_string = 'Tunnel width too small'
[2274]	768	CALL message( 'init_grid', 'PA0455', 1, 2, 0, 6, 0 )
[2232]	769	ENDIF
	770	!
	771	!-- Tunnel axis along x
	772	IF ( tunnel_width_y /= 9999999.9_wp ) THEN
	773	IF ( tunnel_width_y > ( ny + 1 ) * dy ) THEN
	774	message_string = 'Tunnel width too large'
[2274]	775	CALL message( 'init_grid', 'PA0456', 1, 2, 0, 6, 0 )
[2232]	776	ENDIF
	777
	778	txs_out = INT( ( nx + 1 ) * 0.5_wp * dx - tunnel_length * 0.5_wp )
	779	txe_out = INT( ( nx + 1 ) * 0.5_wp * dx + tunnel_length * 0.5_wp )
	780	txs_in = txs_out
	781	txe_in = txe_out
	782
	783	tys_out = INT( ( ny + 1 ) * 0.5_wp * dy - tunnel_width_y * 0.5_wp )
	784	tye_out = INT( ( ny + 1 ) * 0.5_wp * dy + tunnel_width_y * 0.5_wp )
	785	tys_in = INT( ( ny + 1 ) * 0.5_wp * dy - &
	786	( tunnel_width_y * 0.5_wp - td ) )
	787	tye_in = INT( ( ny + 1 ) * 0.5_wp * dy + &
	788	( tunnel_width_y * 0.5_wp - td ) )
	789	ENDIF
	790
	791	topo_3d = 0
	792	DO i = nxl, nxr
	793	DO j = nys, nyn
	794	!
	795	!-- Use heaviside function to model outer tunnel surface
	796	hv_out = th * 0.5_wp * &
	797	( ( SIGN( 1.0_wp, i * dx - txs_out ) + 1.0_wp ) &
	798	- ( SIGN( 1.0_wp, i * dx - txe_out ) + 1.0_wp ) )
	799
	800	hv_out = hv_out * 0.5_wp * &
	801	( ( SIGN( 1.0_wp, j * dy - tys_out ) + 1.0_wp ) &
	802	- ( SIGN( 1.0_wp, j * dy - tye_out ) + 1.0_wp ) )
	803	!
	804	!-- Use heaviside function to model inner tunnel surface
	805	hv_in = ( th - td ) * 0.5_wp * &
	806	( ( SIGN( 1.0_wp, i * dx - txs_in ) + 1.0_wp ) &
	807	- ( SIGN( 1.0_wp, i * dx - txe_in ) + 1.0_wp ) )
	808
	809	hv_in = hv_in * 0.5_wp * &
	810	( ( SIGN( 1.0_wp, j * dy - tys_in ) + 1.0_wp ) &
	811	- ( SIGN( 1.0_wp, j * dy - tye_in ) + 1.0_wp ) )
	812	!
	813	!-- Set flags at x-y-positions without any tunnel surface
	814	IF ( hv_out - hv_in == 0.0_wp ) THEN
	815	topo_3d(nzb+1:nzt+1,j,i) = IBSET( topo_3d(nzb+1:nzt+1,j,i), 0 )
	816	!
	817	!-- Set flags at x-y-positions with tunnel surfaces
	818	ELSE
	819	DO k = nzb + 1, nzt + 1
	820	!
	821	!-- Inner tunnel
	822	IF ( hv_out - hv_in == th ) THEN
	823	IF ( zw(k) <= hv_out ) THEN
	824	topo_3d(k,j,i) = IBCLR( topo_3d(k,j,i), 0 )
	825	ELSE
	826	topo_3d(k,j,i) = IBSET( topo_3d(k,j,i), 0 )
	827	ENDIF
	828	ENDIF
	829	!
	830	!-- Lateral tunnel walls
	831	IF ( hv_out - hv_in == td ) THEN
	832	IF ( zw(k) <= hv_in ) THEN
	833	topo_3d(k,j,i) = IBSET( topo_3d(k,j,i), 0 )
	834	ELSEIF ( zw(k) > hv_in .AND. zw(k) <= hv_out ) THEN
	835	topo_3d(k,j,i) = IBCLR( topo_3d(k,j,i), 0 )
	836	ELSEIF ( zw(k) > hv_out ) THEN
	837	topo_3d(k,j,i) = IBSET( topo_3d(k,j,i), 0 )
	838	ENDIF
	839	ENDIF
	840	ENDDO
	841	ENDIF
	842	ENDDO
	843	ENDDO
	844
	845	nzb_local = 0
	846	!
	847	!-- level of detail is required for output routines. Here, 3D topography.
	848	lod = 2
	849
	850	CALL exchange_horiz_int( topo_3d, nbgp )
	851
[1]	852	CASE ( 'read_from_file' )
[759]	853
[2232]	854	ALLOCATE ( oro_height(nys:nyn,nxl:nxr) )
[1968]	855	ALLOCATE ( topo_height(nys:nyn,nxl:nxr) )
[2232]	856	oro_height = 0.0_wp
	857	topo_height = 0.0_wp
[818]	858
[759]	859	DO ii = 0, io_blocks-1
	860	IF ( ii == io_group ) THEN
	861
[1]	862	!
[759]	863	!-- Arbitrary irregular topography data in PALM format (exactly
[2232]	864	!-- matching the grid size and total domain size).
	865	!-- First, check if NetCDF file for topography exist or not.
	866	!-- This case, read topography from NetCDF, else read it from
	867	!-- ASCII file.
	868	#if defined ( __netcdf )
	869	INQUIRE( FILE='TOPOGRAPHY_DATA_NC'//TRIM( coupling_char ), &
	870	EXIST=netcdf_extend )
[1968]	871	!
[2232]	872	!-- NetCDF branch
	873	IF ( netcdf_extend ) THEN
[1968]	874	!
[2232]	875	!-- Open file in read-only mode
	876	CALL netcdf_open_read_file( 'TOPOGRAPHY_DATA_NC', &
	877	id_topo, 20 ) !Error number still need to be set properly
	878
	879	!
	880	!-- Read terrain height. Reading is done PE-wise, i.e. each
	881	!-- processor reads its own domain. Reading is realized
	882	!-- via looping over x-dimension, i.e. calling
	883	!-- netcdf_get_variable reads topography along y for given x.
	884	!-- Orography is 2D.
	885	DO i = nxl, nxr
	886	CALL netcdf_get_variable( id_topo, 'orography_0', &
	887	i, oro_height(:,i), 20 ) !Error number still need to be set properly
	888	ENDDO
	889	!
	890	!-- Read attribute lod (level of detail), required for variable
	891	!-- buildings_0
	892	CALL netcdf_get_attribute( id_topo, "lod", lod, .FALSE., &
	893	20, 'buildings_0' ) !Error number still need to be set properly
	894	!
	895	!-- Read building height
	896	!-- 2D for lod = 1, 3D for lod = 2
	897	IF ( lod == 1 ) THEN
	898	DO i = nxl, nxr
	899	CALL netcdf_get_variable( id_topo, 'buildings_0', &
	900	i, topo_height(:,i), 20 ) !Error number still need to be set properly
	901	ENDDO
	902
	903	ELSEIF ( lod == 2 ) THEN
	904	!
	905	!-- Read data PE-wise. Read yz-slices.
	906	DO i = nxl, nxr
	907	DO j = nys, nyn
	908	CALL netcdf_get_variable( id_topo, 'buildings_0', &
	909	i, j, topo_3d(:,j,i), 20 ) !Error number still need to be set properly
	910	ENDDO
	911	ENDDO
	912	ELSE
	913	message_string = 'NetCDF attribute lod ' // &
	914	'(level of detail) is not set properly.'
[2274]	915	CALL message( 'init_grid', 'PA0457', 1, 2, 0, 6, 0 )
[2232]	916	ENDIF
	917	!
	918	!-- Close topography input file
	919	CALL netcdf_close_file( id_topo, 20 )
	920	#endif
	921
	922	!
	923	!-- ASCII branch. Please note, reading of 3D topography is not
	924	!-- supported in ASCII format. Further, no distinction is made
	925	!-- between orography and buildings
	926	ELSE
	927
	928	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	929	STATUS='OLD', FORM='FORMATTED', ERR=10 )
	930	!
	931	!-- Read topography PE-wise. Rows are read from nyn to nys, columns
	932	!-- are read from nxl to nxr. At first, ny-nyn rows need to be skipped.
	933	skip_n_rows = 0
	934	DO WHILE ( skip_n_rows < ny - nyn )
	935	READ( 90, * )
	936	skip_n_rows = skip_n_rows + 1
	937	ENDDO
	938	!
	939	!-- Read data from nyn to nys and nxl to nxr. Therefore, skip
	940	!-- column until nxl-1 is reached
	941	DO j = nyn, nys, -1
	942	READ( 90, *, ERR=11, END=11 ) &
[1968]	943	( dum, i = 0, nxl-1 ), &
	944	( topo_height(j,i), i = nxl, nxr )
[2232]	945	ENDDO
[759]	946
[2232]	947	GOTO 12
[759]	948
[2232]	949	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	950	' does not exist'
	951	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
[759]	952
[2232]	953	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	954	TRIM( coupling_char )
	955	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
[759]	956
[2232]	957	12 CLOSE( 90 )
[759]	958
[2232]	959	ENDIF
	960
[759]	961	ENDIF
[1804]	962	#if defined( __parallel )
[759]	963	CALL MPI_BARRIER( comm2d, ierr )
	964	#endif
[559]	965	ENDDO
[759]	966
[1]	967	!
	968	!-- Calculate the index height of the topography
[1968]	969	nzb_local = 0
	970	DO i = nxl, nxr
	971	DO j = nys, nyn
[2128]	972	IF ( .NOT. ocean ) THEN
[2232]	973	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) &
	974	- oro_height(j,i) ), 1 ) - 1
	975	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) &
	976	- oro_height(j,i) ) == &
	977	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) &
	978	- oro_height(j,i) ) ) &
[2128]	979	nzb_local(j,i) = nzb_local(j,i) + 1
	980	ELSE
	981	nzb_local(j,i) = MINLOC( ABS( zw - zw(0) &
[2232]	982	- topo_height(j,i) &
	983	- oro_height(j,i) ), 1 ) - 1
[2128]	984	IF ( ABS( zw(nzb_local(j,i) ) - zw(0) &
[2232]	985	- topo_height(j,i) &
	986	- oro_height(j,i) ) == &
[2128]	987	ABS( zw(nzb_local(j,i)+1) - zw(0) &
[2232]	988	- topo_height(j,i) &
	989	- oro_height(j,i) ) ) &
[2128]	990	nzb_local(j,i) = nzb_local(j,i) + 1
	991	ENDIF
	992
[1]	993	ENDDO
	994	ENDDO
[818]	995
[2232]	996	DEALLOCATE ( oro_height )
[818]	997	DEALLOCATE ( topo_height )
[1942]	998	!
	999	!-- Filter topography, i.e. fill holes resolved by only one grid point.
	1000	!-- Such holes are suspected to lead to velocity blow-ups as continuity
	1001	!-- equation on discrete grid cannot be fulfilled in such case.
	1002	!-- For now, check only for holes and fill them to the lowest height level
	1003	!-- of the directly adjoining grid points along x- and y- direction.
	1004	!-- Before checking for holes, set lateral boundary conditions for
	1005	!-- topography. After hole-filling, boundary conditions must be set again!
[1968]	1006	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	1007
	1008	IF ( .NOT. bc_ns_cyc ) THEN
	1009	IF ( nys == 0 ) nzb_local(-1,:) = nzb_local(0,:)
	1010	IF ( nyn == ny ) nzb_local(ny+1,:) = nzb_local(ny,:)
[1942]	1011	ENDIF
[1910]	1012
[1968]	1013	IF ( .NOT. bc_lr_cyc ) THEN
	1014	IF ( nxl == 0 ) nzb_local(:,-1) = nzb_local(:,0)
	1015	IF ( nxr == nx ) nzb_local(:,nx+1) = nzb_local(:,nx)
[1942]	1016	ENDIF
	1017
[1968]	1018	num_hole_l = 0
	1019	DO i = nxl, nxr
	1020	DO j = nys, nyn
[1942]	1021
	1022	num_wall = 0
	1023
	1024	IF ( nzb_local(j-1,i) > nzb_local(j,i) ) &
	1025	num_wall = num_wall + 1
	1026	IF ( nzb_local(j+1,i) > nzb_local(j,i) ) &
	1027	num_wall = num_wall + 1
	1028	IF ( nzb_local(j,i-1) > nzb_local(j,i) ) &
	1029	num_wall = num_wall + 1
	1030	IF ( nzb_local(j,i+1) > nzb_local(j,i) ) &
	1031	num_wall = num_wall + 1
	1032
	1033	IF ( num_wall == 4 ) THEN
	1034	nzb_local(j,i) = MIN( nzb_local(j-1,i), nzb_local(j+1,i), &
	1035	nzb_local(j,i-1), nzb_local(j,i+1) )
[1968]	1036	num_hole_l = num_hole_l + 1
[1942]	1037	ENDIF
	1038	ENDDO
	1039	ENDDO
[114]	1040	!
[1968]	1041	!-- Count the total number of holes, required for informative message.
	1042	#if defined( __parallel )
	1043	CALL MPI_ALLREDUCE( num_hole_l, num_hole, 1, MPI_INTEGER, MPI_SUM, &
	1044	comm2d, ierr )
	1045	#else
	1046	num_hole = num_hole_l
	1047	#endif
	1048	!
[1942]	1049	!-- Create an informative message if any hole was removed.
[1968]	1050	IF ( num_hole > 0 ) THEN
[1942]	1051	WRITE( message_string, * ) num_hole, 'hole(s) resolved by only '//&
	1052	'one grid point were filled'
	1053	CALL message( 'init_grid', 'PA0430', 0, 0, 0, 6, 0 )
	1054	ENDIF
[2232]	1055
[1942]	1056	!
[2232]	1057	!-- Set bit array to mask topography. Only required for lod = 1
	1058	IF ( lod == 1 ) THEN
	1059	DO i = nxlg, nxrg
	1060	DO j = nysg, nyng
	1061	topo_3d(nzb_local(j,i)+1:nzt+1,j,i) = &
	1062	IBSET( topo_3d(nzb_local(j,i)+1:nzt+1,j,i), 0 )
	1063	ENDDO
	1064	ENDDO
	1065	ENDIF
	1066	!
[1968]	1067	!-- Exchange ghost-points, as well as add cyclic or Neumann boundary
	1068	!-- conditions.
[2232]	1069	CALL exchange_horiz_int( topo_3d, nbgp )
[1968]	1070	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	1071
	1072	IF ( .NOT. bc_ns_cyc ) THEN
[2232]	1073	IF ( nys == 0 ) topo_3d(:,-1,:) = topo_3d(:,0,:)
	1074	IF ( nyn == ny ) topo_3d(:,ny+1,:) = topo_3d(:,ny,:)
	1075
[1968]	1076	IF ( nys == 0 ) nzb_local(-1,:) = nzb_local(0,:)
	1077	IF ( nyn == ny ) nzb_local(ny+1,:) = nzb_local(ny,:)
[1910]	1078	ENDIF
[667]	1079
[1968]	1080	IF ( .NOT. bc_lr_cyc ) THEN
[2232]	1081	IF ( nxl == 0 ) topo_3d(:,:,-1) = topo_3d(:,:,0)
	1082	IF ( nxr == nx ) topo_3d(:,:,nx+1) = topo_3d(:,:,nx)
	1083
[1968]	1084	IF ( nxl == 0 ) nzb_local(:,-1) = nzb_local(:,0)
	1085	IF ( nxr == nx ) nzb_local(:,nx+1) = nzb_local(:,nx)
[1910]	1086	ENDIF
	1087
[2232]	1088
[1]	1089	CASE DEFAULT
	1090	!
	1091	!-- The DEFAULT case is reached either if the parameter topography
[217]	1092	!-- contains a wrong character string or if the user has defined a special
[1]	1093	!-- case in the user interface. There, the subroutine user_init_grid
	1094	!-- checks which of these two conditions applies.
[2232]	1095	CALL user_init_grid( topo_3d )
[1]	1096
	1097	END SELECT
	1098	!
	1099	!-- Consistency checks and index array initialization are only required for
[217]	1100	!-- non-flat topography, also the initialization of topography height arrays
[49]	1101	!-- zu_s_inner and zw_w_inner
[1]	1102	IF ( TRIM( topography ) /= 'flat' ) THEN
[1968]	1103	#if defined( __parallel )
	1104	CALL MPI_ALLREDUCE( MAXVAL( nzb_local ), nzb_local_max, 1, MPI_INTEGER, &
	1105	MPI_MAX, comm2d, ierr )
[1982]	1106	CALL MPI_ALLREDUCE( MINVAL( nzb_local ), nzb_local_min, 1, MPI_INTEGER, &
[1968]	1107	MPI_MIN, comm2d, ierr )
	1108	#else
	1109	nzb_local_max = MAXVAL( nzb_local )
	1110	nzb_local_min = MINVAL( nzb_local )
	1111	#endif
[1982]	1112
[1]	1113	!
	1114	!-- Consistency checks
[1968]	1115	IF ( nzb_local_min < 0 .OR. nzb_local_max > nz + 1 ) THEN
[1353]	1116	WRITE( message_string, * ) 'nzb_local values are outside the', &
	1117	'model domain', &
[1968]	1118	'&MINVAL( nzb_local ) = ', nzb_local_min, &
	1119	'&MAXVAL( nzb_local ) = ', nzb_local_max
[254]	1120	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	1121	ENDIF
[2232]	1122	!
	1123	!-- In case of non-flat topography, check whether the convention how to
	1124	!-- define the topography grid has been set correctly, or whether the default
	1125	!-- is applicable. If this is not possible, abort.
	1126	IF ( TRIM( topography_grid_convention ) == ' ' ) THEN
	1127	IF ( TRIM( topography ) /= 'single_building' .AND. &
	1128	TRIM( topography ) /= 'single_street_canyon' .AND. &
	1129	TRIM( topography ) /= 'tunnel' .AND. &
	1130	TRIM( topography ) /= 'read_from_file') THEN
	1131	!-- The default value is not applicable here, because it is only valid
	1132	!-- for the two standard cases 'single_building' and 'read_from_file'
	1133	!-- defined in init_grid.
	1134	WRITE( message_string, * ) &
	1135	'The value for "topography_grid_convention" ', &
	1136	'is not set. Its default value is & only valid for ', &
	1137	'"topography" = ''single_building'', ', &
	1138	'''single_street_canyon'' & or ''read_from_file''.', &
	1139	' & Choose ''cell_edge'' or ''cell_center''.'
	1140	CALL message( 'init_grid', 'PA0239', 1, 2, 0, 6, 0 )
	1141	ELSE
	1142	!-- The default value is applicable here.
	1143	!-- Set convention according to topography.
	1144	IF ( TRIM( topography ) == 'single_building' .OR. &
	1145	TRIM( topography ) == 'single_street_canyon' ) THEN
	1146	topography_grid_convention = 'cell_edge'
	1147	ELSEIF ( TRIM( topography ) == 'read_from_file' .OR. &
	1148	TRIM( topography ) == 'tunnel') THEN
	1149	topography_grid_convention = 'cell_center'
	1150	ENDIF
	1151	ENDIF
	1152	ELSEIF ( TRIM( topography_grid_convention ) /= 'cell_edge' .AND. &
	1153	TRIM( topography_grid_convention ) /= 'cell_center' ) THEN
	1154	WRITE( message_string, * ) &
	1155	'The value for "topography_grid_convention" is ', &
	1156	'not recognized. & Choose ''cell_edge'' or ''cell_center''.'
	1157	CALL message( 'init_grid', 'PA0240', 1, 2, 0, 6, 0 )
	1158	ENDIF
[1]	1159
[2169]	1160	!
	1161	!-- In case of non-flat topography, check whether the convention how to
	1162	!-- define the topography grid has been set correctly, or whether the default
	1163	!-- is applicable. If this is not possible, abort.
	1164	IF ( TRIM( topography_grid_convention ) == ' ' ) THEN
	1165	IF ( TRIM( topography ) /= 'single_building' .AND. &
	1166	TRIM( topography ) /= 'single_street_canyon' .AND. &
	1167	TRIM( topography ) /= 'read_from_file' ) THEN
	1168	!-- The default value is not applicable here, because it is only valid
	1169	!-- for the two standard cases 'single_building' and 'read_from_file'
	1170	!-- defined in init_grid.
	1171	WRITE( message_string, * ) &
	1172	'The value for "topography_grid_convention" ', &
	1173	'is not set. Its default value is & only valid for ', &
	1174	'"topography" = ''single_building'', ', &
	1175	'''single_street_canyon'' & or ''read_from_file''.', &
	1176	' & Choose ''cell_edge'' or ''cell_center''.'
	1177	CALL message( 'init_grid', 'PA0239', 1, 2, 0, 6, 0 )
	1178	ELSE
	1179	!-- The default value is applicable here.
	1180	!-- Set convention according to topography.
	1181	IF ( TRIM( topography ) == 'single_building' .OR. &
	1182	TRIM( topography ) == 'single_street_canyon' ) THEN
	1183	topography_grid_convention = 'cell_edge'
	1184	ELSEIF ( TRIM( topography ) == 'read_from_file' ) THEN
	1185	topography_grid_convention = 'cell_center'
	1186	ENDIF
	1187	ENDIF
	1188	ELSEIF ( TRIM( topography_grid_convention ) /= 'cell_edge' .AND. &
	1189	TRIM( topography_grid_convention ) /= 'cell_center' ) THEN
	1190	WRITE( message_string, * ) &
	1191	'The value for "topography_grid_convention" is ', &
	1192	'not recognized. & Choose ''cell_edge'' or ''cell_center''.'
	1193	CALL message( 'init_grid', 'PA0240', 1, 2, 0, 6, 0 )
	1194	ENDIF
	1195
[217]	1196	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	1197	!
[217]	1198	!-- The array nzb_local as defined using the 'cell_edge' convention
	1199	!-- describes the actual total size of topography which is defined at the
	1200	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	1201	!-- on the topography walls in y-direction. However, PALM uses individual
	1202	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	1203	!-- Therefore, the extent of topography in nzb_local is now reduced by
	1204	!-- 1dx at the E topography walls and by 1dy at the N topography walls
[1968]	1205	!-- to form the basis for nzb_s_inner.
	1206	!-- Note, the reverse memory access (i-j instead of j-i) is absolutely
	1207	!-- required at this point.
	1208	DO j = nys+1, nyn+1
	1209	DO i = nxl-1, nxr
[217]	1210	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	1211	ENDDO
[134]	1212	ENDDO
[1968]	1213	!
	1214	!-- Exchange ghost points
	1215	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
	1216
	1217	DO i = nxl, nxr+1
	1218	DO j = nys-1, nyn
[217]	1219	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	1220	ENDDO
[2232]	1221	ENDDO
[1968]	1222	!
	1223	!-- Exchange ghost points
	1224	CALL exchange_horiz_2d_int( nzb_local, nys, nyn, nxl, nxr, nbgp )
[2232]	1225	!
	1226	!-- Apply cell-edge convention also for 3D topo array. The former setting
	1227	!-- of nzb_local will be removed later.
	1228	DO j = nys+1, nyn+1
	1229	DO i = nxl-1, nxr
	1230	DO k = nzb, nzt+1
	1231	IF ( BTEST( topo_3d(k,j,i), 0 ) .OR. &
	1232	BTEST( topo_3d(k,j,i+1), 0 ) ) &
	1233	topo_3d(k,j,i) = IBSET( topo_3d(k,j,i), 0 )
	1234	ENDDO
	1235	ENDDO
	1236	ENDDO
	1237	CALL exchange_horiz_int( topo_3d, nbgp )
	1238
	1239	DO i = nxl, nxr+1
	1240	DO j = nys-1, nyn
	1241	DO k = nzb, nzt+1
	1242	IF ( BTEST( topo_3d(k,j,i), 0 ) .OR. &
	1243	BTEST( topo_3d(k,j+1,i), 0 ) ) &
	1244	topo_3d(k,j,i) = IBSET( topo_3d(k,j,i), 0 )
	1245	ENDDO
	1246	ENDDO
	1247	ENDDO
	1248	CALL exchange_horiz_int( topo_3d, nbgp )
	1249
[217]	1250	ENDIF
[2232]	1251
[1]	1252	!
	1253	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[2232]	1254
[1968]	1255	nzb_s_inner = nzb_local
	1256	nzb_w_inner = nzb_local
[1]	1257
	1258	!
	1259	!-- Initialize remaining index arrays:
	1260	!-- first pre-initialize them with nzb_s_inner...
	1261	nzb_u_inner = nzb_s_inner
	1262	nzb_u_outer = nzb_s_inner
	1263	nzb_v_inner = nzb_s_inner
	1264	nzb_v_outer = nzb_s_inner
	1265	nzb_w_outer = nzb_s_inner
	1266	nzb_s_outer = nzb_s_inner
	1267
	1268	!
	1269	!-- ...then extend pre-initialized arrays in their according directions
	1270	!-- based on nzb_local using nzb_tmp as a temporary global index array
	1271
	1272	!
	1273	!-- nzb_s_outer:
	1274	!-- extend nzb_local east-/westwards first, then north-/southwards
[1968]	1275	nzb_tmp = nzb_local
	1276	DO j = nys, nyn
	1277	DO i = nxl, nxr
[1353]	1278	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	1279	nzb_local(j,i+1) )
	1280	ENDDO
	1281	ENDDO
[1968]	1282
	1283	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	1284
[1]	1285	DO i = nxl, nxr
	1286	DO j = nys, nyn
[1353]	1287	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	1288	nzb_tmp(j+1,i) )
	1289	ENDDO
	1290	!
	1291	!-- non-cyclic boundary conditions (overwritten by call of
	1292	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1293	IF ( nys == 0 ) THEN
	1294	j = -1
	1295	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	1296	ENDIF
[1743]	1297	IF ( nyn == ny ) THEN
[1]	1298	j = ny + 1
	1299	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	1300	ENDIF
	1301	ENDDO
	1302	!
	1303	!-- nzb_w_outer:
	1304	!-- identical to nzb_s_outer
	1305	nzb_w_outer = nzb_s_outer
	1306
	1307	!
	1308	!-- nzb_u_inner:
	1309	!-- extend nzb_local rightwards only
[1968]	1310	nzb_tmp = nzb_local
	1311	DO j = nys, nyn
	1312	DO i = nxl, nxr
[1]	1313	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	1314	ENDDO
	1315	ENDDO
[1968]	1316
	1317	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	1318
	1319	nzb_u_inner = nzb_tmp
[1]	1320	!
	1321	!-- nzb_u_outer:
	1322	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	1323	DO i = nxl, nxr
	1324	DO j = nys, nyn
[1353]	1325	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	1326	nzb_tmp(j+1,i) )
	1327	ENDDO
	1328	!
	1329	!-- non-cyclic boundary conditions (overwritten by call of
	1330	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1331	IF ( nys == 0 ) THEN
	1332	j = -1
	1333	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	1334	ENDIF
[1743]	1335	IF ( nyn == ny ) THEN
[1]	1336	j = ny + 1
	1337	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	1338	ENDIF
	1339	ENDDO
	1340
	1341	!
	1342	!-- nzb_v_inner:
	1343	!-- extend nzb_local northwards only
[1968]	1344	nzb_tmp = nzb_local
	1345	DO i = nxl, nxr
	1346	DO j = nys, nyn
[1]	1347	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	1348	ENDDO
	1349	ENDDO
[1968]	1350
	1351	CALL exchange_horiz_2d_int( nzb_tmp, nys, nyn, nxl, nxr, nbgp )
	1352	nzb_v_inner = nzb_tmp
[1]	1353
	1354	!
	1355	!-- nzb_v_outer:
	1356	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	1357	DO j = nys, nyn
	1358	DO i = nxl, nxr
[1353]	1359	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	1360	nzb_tmp(j,i+1) )
	1361	ENDDO
	1362	!
	1363	!-- non-cyclic boundary conditions (overwritten by call of
	1364	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	1365	IF ( nxl == 0 ) THEN
	1366	i = -1
	1367	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	1368	ENDIF
	1369	IF ( nxr == nx ) THEN
	1370	i = nx + 1
	1371	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	1372	ENDIF
	1373	ENDDO
[1804]	1374
[1]	1375	!
	1376	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	1377	!-- boundary conditions, if applicable.
	1378	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	1379	!-- they do not require exchange and are not included here.
[1968]	1380	CALL exchange_horiz_2d_int( nzb_u_inner, nys, nyn, nxl, nxr, nbgp )
	1381	CALL exchange_horiz_2d_int( nzb_u_outer, nys, nyn, nxl, nxr, nbgp )
	1382	CALL exchange_horiz_2d_int( nzb_v_inner, nys, nyn, nxl, nxr, nbgp )
	1383	CALL exchange_horiz_2d_int( nzb_v_outer, nys, nyn, nxl, nxr, nbgp )
	1384	CALL exchange_horiz_2d_int( nzb_w_outer, nys, nyn, nxl, nxr, nbgp )
	1385	CALL exchange_horiz_2d_int( nzb_s_outer, nys, nyn, nxl, nxr, nbgp )
[1]	1386
[2232]	1387	ENDIF
[49]	1388	!
[2232]	1389	!-- Deallocate temporary array, as it might be reused for different
	1390	!-- grid-levels further below.
	1391	DEALLOCATE( nzb_tmp )
	1392
	1393	!
	1394	!-- Determine the maximum level of topography. It is used for
	1395	!-- steering the degradation of order of the applied advection scheme.
	1396	!-- In case of non-cyclic lateral boundaries, the order of the advection
	1397	!-- scheme has to be reduced up to nzt (required at the lateral boundaries).
	1398	k_top = 0
	1399	DO i = nxl, nxr
	1400	DO j = nys, nyn
	1401	DO k = nzb, nzt + 1
	1402	k_top = MAX( k_top, MERGE( k, 0, &
	1403	.NOT. BTEST( topo_3d(k,j,i), 0 ) ) )
[1968]	1404	ENDDO
	1405	ENDDO
[2232]	1406	ENDDO
[1968]	1407	#if defined( __parallel )
[2232]	1408	CALL MPI_ALLREDUCE( k_top + 1, nzb_max, 1, MPI_INTEGER, & !is +1 really necessary here?
	1409	MPI_MAX, comm2d, ierr )
[1968]	1410	#else
[2232]	1411	nzb_max = k_top + 1
[1968]	1412	#endif
[2232]	1413	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
	1414	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	1415	nest_domain ) &
	1416	THEN
	1417	nzb_max = nzt
[1]	1418	ENDIF
[1968]	1419	!
[2232]	1420	!-- Finally, if topography extents up to the model top, limit nzb_max to nzt.
	1421	nzb_max = MIN( nzb_max, nzt )
[1]	1422
	1423	!
	1424	!-- Set the individual index arrays which define the k index from which on
	1425	!-- the usual finite difference form (which does not use surface fluxes) is
	1426	!-- applied
[1691]	1427	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	1428	nzb_diff_s_inner = nzb_s_inner + 2
	1429	nzb_diff_s_outer = nzb_s_outer + 2
	1430	ELSE
	1431	nzb_diff_s_inner = nzb_s_inner + 1
	1432	nzb_diff_s_outer = nzb_s_outer + 1
	1433	ENDIF
	1434
	1435	!
[2232]	1436	!-- Set-up topography flags. First, set flags only for s, u, v and w-grid.
	1437	!-- Further special flags will be set in following loops.
	1438	wall_flags_0 = 0
	1439	DO j = nys, nyn
	1440	DO i = nxl, nxr
	1441	DO k = nzb, nzt+1
	1442	!
	1443	!-- scalar grid
	1444	IF ( BTEST( topo_3d(k,j,i), 0 ) ) &
	1445	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1446	!
	1447	!-- v grid
	1448	IF ( BTEST( topo_3d(k,j,i), 0 ) .AND. &
	1449	BTEST( topo_3d(k,j-1,i), 0 ) ) &
	1450	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1451	!
	1452	!-- To do: set outer arrays on basis of topo_3d array, adjust for downward-facing walls
	1453	!-- s grid outer array
	1454	IF ( k >= nzb_s_outer(j,i) ) &
	1455	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1456	!
	1457	!-- s grid outer array
	1458	IF ( k >= nzb_u_outer(j,i) ) &
	1459	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1460	!
	1461	!-- s grid outer array
	1462	IF ( k >= nzb_v_outer(j,i) ) &
	1463	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1464	!
	1465	!-- w grid outer array
	1466	IF ( k >= nzb_w_outer(j,i) ) &
	1467	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
	1468	ENDDO
[1]	1469
[2232]	1470	DO k = nzb, nzt
[1]	1471	!
[2232]	1472	!-- w grid
	1473	IF ( BTEST( topo_3d(k,j,i), 0 ) .AND. &
	1474	BTEST( topo_3d(k+1,j,i), 0 ) ) &
	1475	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1476	ENDDO
	1477	wall_flags_0(nzt+1,j,i) = IBSET( wall_flags_0(nzt+1,j,i), 3 )
	1478
	1479	ENDDO
	1480	ENDDO
[1]	1481	!
[2232]	1482	!-- u grid. Note, reverse
	1483	!-- memory access is required for setting flag on u-grid
	1484	DO j = nys, nyn
	1485	DO i = nxl, nxr
	1486	DO k = nzb, nzt+1
	1487	IF ( BTEST( topo_3d(k,j,i), 0 ) .AND. &
	1488	BTEST( topo_3d(k,j,i-1), 0 ) ) &
	1489	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1490	ENDDO
	1491	ENDDO
	1492	ENDDO
[1]	1493	!
[2232]	1494	!-- Set further special flags
	1495	DO i = nxl, nxr
	1496	DO j = nys, nyn
	1497	DO k = nzb, nzt+1
[1]	1498	!
[2232]	1499	!-- scalar grid, former nzb_diff_s_inner.
	1500	!-- Note, use this flag also to mask topography in diffusion_u and
	1501	!-- diffusion_v along the vertical direction. In case of
	1502	!-- use_surface_fluxes, fluxes are calculated via MOST, else, simple
	1503	!-- gradient approach is applied. Please note, in case of u- and v-
	1504	!-- diffuison, a small error is made at edges (on the east side for u,
	1505	!-- at the north side for v), since topography on scalar grid point
	1506	!-- is used instead of topography on u/v-grid. As number of topography grid
	1507	!-- points on uv-grid is different than s-grid, different number of
	1508	!-- surface elements would be required. In order to avoid this,
	1509	!-- treat edges (u(k,j,i+1)) simply by a gradient approach, i.e. these
	1510	!-- points are not masked within diffusion_u. Tests had shown that the
	1511	!-- effect on the flow is negligible.
	1512	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
	1513	IF ( BTEST( wall_flags_0(k,j,i), 0 ) ) &
	1514	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1515	ELSE
	1516	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1517	ENDIF
[1]	1518
[2232]	1519	ENDDO
	1520	!
	1521	!-- Special flag to control vertical diffusion at model top - former
	1522	!-- nzt_diff
	1523	wall_flags_0(:,j,i) = IBSET( wall_flags_0(:,j,i), 9 )
	1524	IF ( use_top_fluxes ) &
	1525	wall_flags_0(nzt:nzt+1,j,i) = IBCLR( wall_flags_0(nzt:nzt+1,j,i), 9 )
[1]	1526
[2232]	1527	DO k = nzb+1, nzt
	1528	!
	1529	!-- Special flag on u grid, former nzb_u_inner + 1, required
	1530	!-- for disturb_field and initialization. Do not disturb directly at
	1531	!-- topography, as well as initialize u with zero one grid point outside
	1532	!-- of topography.
	1533	IF ( BTEST( wall_flags_0(k-1,j,i), 1 ) .AND. &
	1534	BTEST( wall_flags_0(k,j,i), 1 ) .AND. &
	1535	BTEST( wall_flags_0(k+1,j,i), 1 ) ) &
	1536	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
	1537	!
	1538	!-- Special flag on v grid, former nzb_v_inner + 1, required
	1539	!-- for disturb_field and initialization. Do not disturb directly at
	1540	!-- topography, as well as initialize v with zero one grid point outside
	1541	!-- of topography.
	1542	IF ( BTEST( wall_flags_0(k-1,j,i), 2 ) .AND. &
	1543	BTEST( wall_flags_0(k,j,i), 2 ) .AND. &
	1544	BTEST( wall_flags_0(k+1,j,i), 2 ) ) &
	1545	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1546	!
	1547	!-- Special flag on scalar grid, former nzb_s_inner+1. Used for
	1548	!-- lpm_sgs_tke
	1549	IF ( BTEST( wall_flags_0(k,j,i), 0 ) .AND. &
	1550	BTEST( wall_flags_0(k-1,j,i), 0 ) .AND. &
	1551	BTEST( wall_flags_0(k+1,j,i), 0 ) ) &
	1552	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1553	!
	1554	!-- Special flag on scalar grid, nzb_diff_s_outer - 1, required in
	1555	!-- in production_e
	1556	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
	1557	IF ( BTEST( wall_flags_0(k,j,i), 24 ) .AND. &
	1558	BTEST( wall_flags_0(k-1,j,i), 24 ) .AND. &
	1559	BTEST( wall_flags_0(k+1,j,i), 0 ) ) &
	1560	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 29 )
	1561	ELSE
	1562	IF ( BTEST( wall_flags_0(k,j,i), 0 ) ) &
	1563	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 29 )
[1]	1564	ENDIF
[2232]	1565	!
	1566	!-- Special flag on scalar grid, nzb_diff_s_outer - 1, required in
	1567	!-- in production_e
	1568	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
	1569	IF ( BTEST( wall_flags_0(k,j,i), 0 ) .AND. &
	1570	BTEST( wall_flags_0(k-1,j,i), 0 ) .AND. &
	1571	BTEST( wall_flags_0(k+1,j,i), 0 ) ) &
	1572	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1573	ELSE
	1574	IF ( BTEST( wall_flags_0(k,j,i), 0 ) ) &
	1575	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1576	ENDIF
	1577	ENDDO
	1578	!
	1579	!-- Flags indicating downward facing walls
	1580	DO k = nzb+1, nzt
	1581	!
	1582	!-- Scalar grid
	1583	IF ( BTEST( wall_flags_0(k-1,j,i), 0 ) .AND. &
	1584	.NOT. BTEST( wall_flags_0(k,j,i), 0 ) ) &
	1585	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
	1586	!
	1587	!-- Downward facing wall on u grid
	1588	IF ( BTEST( wall_flags_0(k-1,j,i), 1 ) .AND. &
	1589	.NOT. BTEST( wall_flags_0(k,j,i), 1 ) ) &
	1590	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1591	!
	1592	!-- Downward facing wall on v grid
	1593	IF ( BTEST( wall_flags_0(k-1,j,i), 2 ) .AND. &
	1594	.NOT. BTEST( wall_flags_0(k,j,i), 2 ) ) &
	1595	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1596	!
	1597	!-- Downward facing wall on w grid
	1598	IF ( BTEST( wall_flags_0(k-1,j,i), 3 ) .AND. &
	1599	.NOT. BTEST( wall_flags_0(k,j,i), 3 ) ) &
	1600	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
	1601	ENDDO
	1602	!
	1603	!-- Flags indicating upward facing walls
	1604	DO k = nzb, nzt
	1605	!
	1606	!-- Upward facing wall on scalar grid
	1607	IF ( .NOT. BTEST( wall_flags_0(k,j,i), 0 ) .AND. &
	1608	BTEST( wall_flags_0(k+1,j,i), 0 ) ) &
	1609	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1610	!
	1611	!-- Upward facing wall on u grid
	1612	IF ( .NOT. BTEST( wall_flags_0(k,j,i), 1 ) .AND. &
	1613	BTEST( wall_flags_0(k+1,j,i), 1 ) ) &
	1614	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1]	1615
[2232]	1616	!
	1617	!-- Upward facing wall on v grid
	1618	IF ( .NOT. BTEST( wall_flags_0(k,j,i), 2 ) .AND. &
	1619	BTEST( wall_flags_0(k+1,j,i), 2 ) ) &
	1620	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1621
	1622	!
	1623	!-- Upward facing wall on w grid
	1624	IF ( .NOT. BTEST( wall_flags_0(k,j,i), 3 ) .AND. &
	1625	BTEST( wall_flags_0(k+1,j,i), 3 ) ) &
	1626	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1627	!
	1628	!-- Special flag on scalar grid, former nzb_s_inner
	1629	IF ( BTEST( wall_flags_0(k,j,i), 0 ) .OR. &
	1630	BTEST( wall_flags_0(k,j,i), 12 ) .OR. &
	1631	BTEST( wall_flags_0(k,j,i), 13 ) ) &
	1632	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
	1633	!
	1634	!-- Special flag on scalar grid, nzb_diff_s_inner - 1, required for
	1635	!-- flow_statistics
	1636	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
	1637	IF ( BTEST( wall_flags_0(k,j,i), 0 ) .AND. &
	1638	BTEST( wall_flags_0(k+1,j,i), 0 ) ) &
	1639	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
	1640	ELSE
	1641	IF ( BTEST( wall_flags_0(k,j,i), 22 ) ) &
	1642	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1]	1643	ENDIF
	1644
	1645
[2232]	1646	ENDDO
	1647	wall_flags_0(nzt+1,j,i) = IBSET( wall_flags_0(nzt+1,j,i), 22 )
	1648	wall_flags_0(nzt+1,j,i) = IBSET( wall_flags_0(nzt+1,j,i), 23 )
	1649	ENDDO
	1650	ENDDO
	1651	!
	1652	!-- Exchange ghost points for wall flags
	1653	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1654	!
	1655	!-- Set boundary conditions also for flags. Can be interpreted as Neumann
	1656	!-- boundary conditions for topography.
	1657	IF ( .NOT. bc_ns_cyc ) THEN
	1658	IF ( nys == 0 ) wall_flags_0(:,-1,:) = wall_flags_0(:,0,:)
	1659	IF ( nyn == ny ) wall_flags_0(:,ny+1,:) = wall_flags_0(:,ny,:)
	1660	ENDIF
	1661	IF ( .NOT. bc_lr_cyc ) THEN
	1662	IF ( nxl == 0 ) wall_flags_0(:,:,-1) = wall_flags_0(:,:,0)
	1663	IF ( nxr == nx ) wall_flags_0(:,:,nx+1) = wall_flags_0(:,:,nx)
	1664	ENDIF
[1]	1665
[2232]	1666	!
	1667	!-- Initialize boundary conditions via surface type
	1668	CALL init_bc
	1669	!
	1670	!-- Allocate and set topography height arrays required for data output
	1671	IF ( TRIM( topography ) /= 'flat' ) THEN
	1672	!
	1673	!-- Allocate and set the arrays containing the topography height
[1]	1674
[2232]	1675	IF ( nxr == nx .AND. nyn /= ny ) THEN
	1676	ALLOCATE( zu_s_inner(nxl:nxr+1,nys:nyn), &
	1677	zw_w_inner(nxl:nxr+1,nys:nyn) )
	1678	ELSEIF ( nxr /= nx .AND. nyn == ny ) THEN
	1679	ALLOCATE( zu_s_inner(nxl:nxr,nys:nyn+1), &
	1680	zw_w_inner(nxl:nxr,nys:nyn+1) )
	1681	ELSEIF ( nxr == nx .AND. nyn == ny ) THEN
	1682	ALLOCATE( zu_s_inner(nxl:nxr+1,nys:nyn+1), &
	1683	zw_w_inner(nxl:nxr+1,nys:nyn+1) )
	1684	ELSE
	1685	ALLOCATE( zu_s_inner(nxl:nxr,nys:nyn), &
	1686	zw_w_inner(nxl:nxr,nys:nyn) )
	1687	ENDIF
[1]	1688
[2232]	1689	zu_s_inner = 0.0_wp
	1690	zw_w_inner = 0.0_wp
	1691	!
	1692	!-- Determine local topography height on scalar and w-grid. Note, setting
	1693	!-- lateral boundary values is not necessary, realized via wall_flags_0
	1694	!-- array. Further, please note that loop bounds are different from
	1695	!-- nxl to nxr and nys to nyn on south and right model boundary, hence,
	1696	!-- use intrinsic lbound and ubound functions to infer array bounds.
	1697	DO i = lbound(zu_s_inner, 1), ubound(zu_s_inner, 1)
	1698	DO j = lbound(zu_s_inner, 2), ubound(zu_s_inner, 2)
	1699	!
	1700	!-- Topography height on scalar grid. Therefore, determine index of
	1701	!-- upward-facing surface element on scalar grid (bit 12).
	1702	zu_s_inner(i,j) = zu( MAXLOC( MERGE( &
	1703	1, 0, BTEST( wall_flags_0(:,j,i), 12 )&
	1704	), DIM = 1 &
	1705	) - 1 &
	1706	)
	1707	!
	1708	!-- Topography height on w grid. Therefore, determine index of
	1709	!-- upward-facing surface element on w grid (bit 18).
	1710	zw_w_inner(i,j) = zw( MAXLOC( MERGE( &
	1711	1, 0, BTEST( wall_flags_0(:,j,i), 18 )&
	1712	), DIM = 1 &
	1713	) - 1 &
	1714	)
	1715	ENDDO
	1716	ENDDO
[1]	1717
	1718
[2232]	1719	ENDIF
[1]	1720
	1721	!
[1931]	1722	!-- Calculate wall flag arrays for the multigrid method.
	1723	!-- Please note, wall flags are only applied in the not cache-optimized
	1724	!-- version.
	1725	IF ( psolver == 'multigrid_noopt' ) THEN
[1968]	1726
[114]	1727	!
[1968]	1728	!-- Gridpoint increment of the current level.
[114]	1729	inc = 1
	1730	DO l = maximum_grid_level, 1 , -1
[1968]	1731	!
	1732	!-- Set grid_level as it is required for exchange_horiz_2d_int
	1733	grid_level = l
[114]	1734
	1735	nxl_l = nxl_mg(l)
	1736	nxr_l = nxr_mg(l)
	1737	nys_l = nys_mg(l)
	1738	nyn_l = nyn_mg(l)
	1739	nzt_l = nzt_mg(l)
	1740	!
	1741	!-- Assign the flag level to be calculated
	1742	SELECT CASE ( l )
	1743	CASE ( 1 )
	1744	flags => wall_flags_1
	1745	CASE ( 2 )
	1746	flags => wall_flags_2
	1747	CASE ( 3 )
	1748	flags => wall_flags_3
	1749	CASE ( 4 )
	1750	flags => wall_flags_4
	1751	CASE ( 5 )
	1752	flags => wall_flags_5
	1753	CASE ( 6 )
	1754	flags => wall_flags_6
	1755	CASE ( 7 )
	1756	flags => wall_flags_7
	1757	CASE ( 8 )
	1758	flags => wall_flags_8
	1759	CASE ( 9 )
	1760	flags => wall_flags_9
	1761	CASE ( 10 )
	1762	flags => wall_flags_10
	1763	END SELECT
	1764
	1765	!
	1766	!-- Depending on the grid level, set the respective bits in case of
	1767	!-- neighbouring walls
	1768	!-- Bit 0: wall to the bottom
	1769	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1770	!-- Bit 2: wall to the south
	1771	!-- Bit 3: wall to the north
	1772	!-- Bit 4: wall to the left
	1773	!-- Bit 5: wall to the right
[116]	1774	!-- Bit 6: inside building
[114]	1775
	1776	flags = 0
	1777
[927]	1778	!
	1779	!-- In case of masking method, flags are not set and multigrid method
	1780	!-- works like FFT-solver
[1931]	1781	IF ( .NOT. masking_method ) THEN
[927]	1782
[1968]	1783	!
	1784	!-- Allocate temporary array for topography heights on coarser grid
	1785	!-- level. Please note, 2 ghoist points are required, in order to
	1786	!-- calculate flags() on the interior ghost point.
	1787	ALLOCATE( nzb_tmp(nys_l-2:nyn_l+2,nxl_l-2:nxr_l+2) )
	1788	nzb_tmp = 0
	1789
	1790	DO i = nxl_l, nxr_l
	1791	DO j = nys_l, nyn_l
	1792	nzb_tmp(j,i) = nzb_local(jinc,iinc)
	1793	ENDDO
	1794	ENDDO
	1795	!
	1796	!-- Exchange ghost points on respective multigrid level. 2 ghost points
	1797	!-- are required, in order to calculate flags on
	1798	!-- nys_l-1 / nyn_l+1 / nxl_l-1 / nxr_l+1. The alternative would be to
	1799	!-- exchange 3D-INTEGER array flags on the respective multigrid level.
	1800	CALL exchange_horiz_2d_int( nzb_tmp, nys_l, nyn_l, nxl_l, nxr_l, 2 )
	1801	!
	1802	!-- Set non-cyclic boundary conditions on respective multigrid level
	1803	IF ( .NOT. bc_ns_cyc ) THEN
[2021]	1804	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1968]	1805	nzb_tmp(-2,:) = nzb_tmp(0,:)
	1806	nzb_tmp(-1,:) = nzb_tmp(0,:)
	1807	ENDIF
[2021]	1808	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
	1809	nzb_tmp(nyn_l+2,:) = nzb_tmp(nyn_l,:)
	1810	nzb_tmp(nyn_l+1,:) = nzb_tmp(nyn_l,:)
[1968]	1811	ENDIF
	1812	ENDIF
	1813	IF ( .NOT. bc_lr_cyc ) THEN
[2021]	1814	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1968]	1815	nzb_tmp(:,-2) = nzb_tmp(:,0)
	1816	nzb_tmp(:,-1) = nzb_tmp(:,0)
	1817	ENDIF
[2021]	1818	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
	1819	nzb_tmp(:,nxr_l+1) = nzb_tmp(:,nxr_l)
	1820	nzb_tmp(:,nxr_l+2) = nzb_tmp(:,nxr_l)
[1968]	1821	ENDIF
	1822	ENDIF
	1823
[927]	1824	DO i = nxl_l-1, nxr_l+1
	1825	DO j = nys_l-1, nyn_l+1
[1968]	1826	DO k = nzb, nzt_l+1
[114]	1827	!
[927]	1828	!-- Inside/outside building (inside building does not need
	1829	!-- further tests for walls)
[1968]	1830	IF ( k*inc <= nzb_tmp(j,i) ) THEN
[114]	1831
[927]	1832	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1833
[927]	1834	ELSE
[114]	1835	!
[927]	1836	!-- Bottom wall
[1968]	1837	IF ( (k-1)*inc <= nzb_tmp(j,i) ) THEN
[927]	1838	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1839	ENDIF
[114]	1840	!
[927]	1841	!-- South wall
[1968]	1842	IF ( k*inc <= nzb_tmp(j-1,i) ) THEN
[927]	1843	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1844	ENDIF
[114]	1845	!
[927]	1846	!-- North wall
[1968]	1847	IF ( k*inc <= nzb_tmp(j+1,i) ) THEN
[927]	1848	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1849	ENDIF
[114]	1850	!
[927]	1851	!-- Left wall
[1968]	1852	IF ( k*inc <= nzb_tmp(j,i-1) ) THEN
[927]	1853	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1854	ENDIF
[114]	1855	!
[927]	1856	!-- Right wall
[1968]	1857	IF ( k*inc <= nzb_tmp(j,i+1) ) THEN
[927]	1858	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1859	ENDIF
	1860
[114]	1861	ENDIF
	1862
[927]	1863	ENDDO
[114]	1864	ENDDO
	1865	ENDDO
	1866
[1968]	1867	DEALLOCATE( nzb_tmp )
	1868
[927]	1869	ENDIF
	1870
[114]	1871	inc = inc * 2
	1872
	1873	ENDDO
[1968]	1874	!
	1875	!-- Reset grid_level to "normal" grid
	1876	grid_level = 0
	1877
[114]	1878	ENDIF
[861]	1879	!
[1942]	1880	!-- Allocate flags needed for masking walls. Even though these flags are only
[2021]	1881	!-- required in the ws-scheme, the arrays need to be allocated here as they are
[1942]	1882	!-- used in OpenACC directives.
[2232]	1883	ALLOCATE( advc_flags_1(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1884	advc_flags_2(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	1885	advc_flags_1 = 0
	1886	advc_flags_2 = 0
[114]	1887	!
[2021]	1888	!-- Init flags for ws-scheme to degrade order of the numerics near walls, i.e.
	1889	!-- to decrease the numerical stencil appropriately.
[2200]	1890	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1891	) THEN
[1942]	1892	CALL ws_init_flags
[861]	1893	ENDIF
	1894
	1895	!
[1]	1896	!-- In case of topography: limit near-wall mixing length l_wall further:
	1897	!-- Go through all points of the subdomain one by one and look for the closest
	1898	!-- surface
[2232]	1899	DO i = nxl, nxr
	1900	DO j = nys, nyn
	1901	DO k = nzb+1, nzt
[1]	1902	!
[2232]	1903	!-- Check if current gridpoint belongs to the atmosphere
	1904	IF ( BTEST( wall_flags_0(k,j,i), 0 ) ) THEN
[1]	1905	!
[2232]	1906	!-- Check for neighbouring grid-points.
	1907	!-- Vertical distance, down
	1908	IF ( .NOT. BTEST( wall_flags_0(k-1,j,i), 0 ) ) &
	1909	l_wall(k,j,i) = MIN( l_grid(k), zu(k) - zw(k-1) )
[1]	1910	!
[2232]	1911	!-- Vertical distance, up
	1912	IF ( .NOT. BTEST( wall_flags_0(k+1,j,i), 0 ) ) &
	1913	l_wall(k,j,i) = MIN( l_grid(k), zw(k) - zu(k) )
[1]	1914	!
[2232]	1915	!-- y-distance
	1916	IF ( .NOT. BTEST( wall_flags_0(k,j-1,i), 0 ) .OR. &
	1917	.NOT. BTEST( wall_flags_0(k,j+1,i), 0 ) ) &
	1918	l_wall(k,j,i) = MIN( l_wall(k,j,i), l_grid(k), 0.5_wp * dy )
[1]	1919	!
[2232]	1920	!-- x-distance
	1921	IF ( .NOT. BTEST( wall_flags_0(k,j,i-1), 0 ) .OR. &
	1922	.NOT. BTEST( wall_flags_0(k,j,i+1), 0 ) ) &
	1923	l_wall(k,j,i) = MIN( l_wall(k,j,i), l_grid(k), 0.5_wp * dx )
[1]	1924	!
[2232]	1925	!-- yz-distance (vertical edges, down)
	1926	IF ( .NOT. BTEST( wall_flags_0(k-1,j-1,i), 0 ) .OR. &
	1927	.NOT. BTEST( wall_flags_0(k-1,j+1,i), 0 ) ) &
	1928	l_wall(k,j,i) = MIN( l_wall(k,j,i), l_grid(k), &
	1929	SQRT( 0.25_wp * dy**2 + &
	1930	( zu(k) - zw(k-1) )**2 ) )
[1]	1931	!
[2232]	1932	!-- yz-distance (vertical edges, up)
	1933	IF ( .NOT. BTEST( wall_flags_0(k+1,j-1,i), 0 ) .OR. &
	1934	.NOT. BTEST( wall_flags_0(k+1,j+1,i), 0 ) ) &
	1935	l_wall(k,j,i) = MIN( l_wall(k,j,i), l_grid(k), &
	1936	SQRT( 0.25_wp * dy**2 + &
	1937	( zw(k) - zu(k) )**2 ) )
[1]	1938	!
[2232]	1939	!-- xz-distance (vertical edges, down)
	1940	IF ( .NOT. BTEST( wall_flags_0(k-1,j,i-1), 0 ) .OR. &
	1941	.NOT. BTEST( wall_flags_0(k-1,j,i+1), 0 ) ) &
	1942	l_wall(k,j,i) = MIN( l_wall(k,j,i), l_grid(k), &
	1943	SQRT( 0.25_wp * dx**2 + &
	1944	( zu(k) - zw(k-1) )**2 ) )
[1]	1945	!
[2232]	1946	!-- xz-distance (vertical edges, up)
	1947	IF ( .NOT. BTEST( wall_flags_0(k+1,j,i-1), 0 ) .OR. &
	1948	.NOT. BTEST( wall_flags_0(k+1,j,i+1), 0 ) ) &
	1949	l_wall(k,j,i) = MIN( l_wall(k,j,i), l_grid(k), &
	1950	SQRT( 0.25_wp * dx**2 + &
	1951	( zw(k) - zu(k) )**2 ) )
[1]	1952	!
[2232]	1953	!-- xy-distance (horizontal edges)
	1954	IF ( .NOT. BTEST( wall_flags_0(k,j-1,i-1), 0 ) .OR. &
	1955	.NOT. BTEST( wall_flags_0(k,j+1,i-1), 0 ) .OR. &
	1956	.NOT. BTEST( wall_flags_0(k,j-1,i+1), 0 ) .OR. &
	1957	.NOT. BTEST( wall_flags_0(k,j+1,i+1), 0 ) ) &
	1958	l_wall(k,j,i) = MIN( l_wall(k,j,i), l_grid(k), &
	1959	SQRT( 0.25_wp * ( dx2 + dy2 ) ) )
[1]	1960	!
[2232]	1961	!-- xyz distance (vertical and horizontal edges, down)
	1962	IF ( .NOT. BTEST( wall_flags_0(k-1,j-1,i-1), 0 ) .OR. &
	1963	.NOT. BTEST( wall_flags_0(k-1,j+1,i-1), 0 ) .OR. &
	1964	.NOT. BTEST( wall_flags_0(k-1,j-1,i+1), 0 ) .OR. &
	1965	.NOT. BTEST( wall_flags_0(k-1,j+1,i+1), 0 ) ) &
	1966	l_wall(k,j,i) = MIN( l_wall(k,j,i), l_grid(k), &
	1967	SQRT( 0.25_wp * ( dx2 + dy2 ) &
	1968	+ ( zu(k) - zw(k-1) )**2 ) )
[1]	1969	!
[2232]	1970	!-- xyz distance (vertical and horizontal edges, up)
	1971	IF ( .NOT. BTEST( wall_flags_0(k+1,j-1,i-1), 0 ) .OR. &
	1972	.NOT. BTEST( wall_flags_0(k+1,j+1,i-1), 0 ) .OR. &
	1973	.NOT. BTEST( wall_flags_0(k+1,j-1,i+1), 0 ) .OR. &
	1974	.NOT. BTEST( wall_flags_0(k+1,j+1,i+1), 0 ) ) &
	1975	l_wall(k,j,i) = MIN( l_wall(k,j,i), l_grid(k), &
	1976	SQRT( 0.25_wp * ( dx2 + dy2 ) &
	1977	+ ( zw(k) - zu(k) )**2 ) )
	1978
[1]	1979	ENDIF
	1980	ENDDO
	1981	ENDDO
[2232]	1982	ENDDO
[1]	1983	!
[709]	1984	!-- Set lateral boundary conditions for l_wall
[2232]	1985	CALL exchange_horiz( l_wall, nbgp )
[667]	1986
[1]	1987
	1988	END SUBROUTINE init_grid

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