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source: palm/trunk/SOURCE/init_grid.f90 @ 1927

Last change on this file since 1927 was 1911, checked in by raasch, 8 years ago
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[1682]	1	!> @file init_grid.f90
[1743]	2	!-------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
	5	! PALM is free software: you can redistribute it and/or modify it under the terms
	6	! of the GNU General Public License as published by the Free Software Foundation,
	7	! either version 3 of the License, or (at your option) any later version.
	8	!
	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	12	!
	13	! You should have received a copy of the GNU General Public License along with
	14	! PALM. If not, see <http://www.gnu.org/licenses/>.
	15	!
[1818]	16	! Copyright 1997-2016 Leibniz Universitaet Hannover
[1743]	17	!-------------------------------------------------------------------------------!
[1036]	18	!
[254]	19	! Current revisions:
[1]	20	! -----------------
[1805]	21	!
[1911]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: init_grid.f90 1911 2016-05-26 06:55:16Z hellstea $
	26	!
[1911]	27	! 1910 2016-05-26 06:49:46Z raasch
	28	! Bugfix: if topography is read from file, Neumann conditions are used for the
	29	! nzb_local array (instead of cyclic conditions) in case that non-cyclic
	30	! boundary conditions are switched on for the run
	31	!
[1903]	32	! 1902 2016-05-09 11:18:56Z suehring
[1910]	33	! Set topography flags for multigrid solver only (not for multigrid_fast)
[1903]	34	!
[1887]	35	! 1886 2016-04-21 11:20:47Z suehring
	36	! Bugfix: setting advection flags near walls
	37	! reformulated index values for nzb_v_inner
	38	! variable discriptions added in declaration block
	39	!
[1846]	40	! 1845 2016-04-08 08:29:13Z raasch
	41	! nzb_2d removed
	42	!
[1805]	43	! 1804 2016-04-05 16:30:18Z maronga
	44	! Removed code for parameter file check (__check)
	45	!
[1780]	46	! 1779 2016-03-03 08:01:28Z raasch
	47	! coupling_char is trimmed at every place it occurs, because it can have
	48	! different length now
	49	!
[1763]	50	! 1762 2016-02-25 12:31:13Z hellstea
	51	! Introduction of nested domain feature
	52	!
[1744]	53	! 1743 2016-01-13 10:23:51Z raasch
	54	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	55	! total domain
	56	!
[1692]	57	! 1691 2015-10-26 16:17:44Z maronga
	58	! Renamed prandtl_layer to constant_flux_layer.
	59	!
[1683]	60	! 1682 2015-10-07 23:56:08Z knoop
	61	! Code annotations made doxygen readable
	62	!
[1678]	63	! 1677 2015-10-02 13:25:23Z boeske
	64	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	65	!
[1676]	66	! 1675 2015-10-02 08:28:59Z gronemeier
	67	! Bugfix: Definition of topography grid levels
	68	!
[1662]	69	! 1660 2015-09-21 08:15:16Z gronemeier
	70	! Bugfix: Definition of topography grid levels if vertical grid stretching
	71	! starts below the maximum topography height.
	72	!
[1581]	73	! 1580 2015-04-10 13:43:49Z suehring
	74	! Bugfix: setting flags for 5th order scheme near buildings
	75	!
[1576]	76	! 1575 2015-03-27 09:56:27Z raasch
	77	! adjustments for psolver-queries
	78	!
[1558]	79	! 1557 2015-03-05 16:43:04Z suehring
	80	! Adjustment for monotoinic limiter
	81	!
[1419]	82	! 1418 2014-06-06 13:05:08Z fricke
	83	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	84	! condition and a negative value for dz_stretch_level the condition
	85	! was always true for the whole model domain
	86	!
[1410]	87	! 1409 2014-05-23 12:11:32Z suehring
	88	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	89	! j <= nysv
	90	!
[1354]	91	! 1353 2014-04-08 15:21:23Z heinze
	92	! REAL constants provided with KIND-attribute
	93	!
[1323]	94	! 1322 2014-03-20 16:38:49Z raasch
	95	! REAL constants defined as wp-kind
	96	!
[1321]	97	! 1320 2014-03-20 08:40:49Z raasch
[1320]	98	! ONLY-attribute added to USE-statements,
	99	! kind-parameters added to all INTEGER and REAL declaration statements,
	100	! kinds are defined in new module kinds,
	101	! revision history before 2012 removed,
	102	! comment fields (!:) to be used for variable explanations added to
	103	! all variable declaration statements
[1321]	104	!
[1222]	105	! 1221 2013-09-10 08:59:13Z raasch
	106	! wall_flags_00 introduced to hold bits 32-63,
	107	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	108	! loops optimized for openACC (pres + flow_statistics)
	109	!
[1093]	110	! 1092 2013-02-02 11:24:22Z raasch
	111	! unused variables removed
	112	!
[1070]	113	! 1069 2012-11-28 16:18:43Z maronga
[1779]	114	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	115	! ocean model in case of coupled runs
[1070]	116	!
[1037]	117	! 1036 2012-10-22 13:43:42Z raasch
	118	! code put under GPL (PALM 3.9)
	119	!
[1017]	120	! 1015 2012-09-27 09:23:24Z raasch
	121	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	122	! nzb_w_inner+1
	123	!
[997]	124	! 996 2012-09-07 10:41:47Z raasch
	125	! little reformatting
	126	!
[979]	127	! 978 2012-08-09 08:28:32Z fricke
	128	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	129	! Bugfix: Set wall_flags_0 for inflow boundary
	130	!
[928]	131	! 927 2012-06-06 19:15:04Z raasch
	132	! Wall flags are not set for multigrid method in case of masking method
	133	!
[865]	134	! 864 2012-03-27 15:10:33Z gryschka
[927]	135	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	136	! were not correctly defined for k=1.
[865]	137	!
[863]	138	! 861 2012-03-26 14:18:34Z suehring
[861]	139	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	140	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	141	! model domain.!
[861]	142	! Initialization of nzb_s_inner and nzb_w_inner.
	143	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	144	! while setting wall_flags_0
	145	!
[844]	146	! 843 2012-02-29 15:16:21Z gryschka
	147	! In case of ocean and dirichlet bc for u and v at the bottom
	148	! the first u-level ist defined at same height as the first w-level
	149	!
[819]	150	! 818 2012-02-08 16:11:23Z maronga
	151	! Bugfix: topo_height is only required if topography is used. It is thus now
	152	! allocated in the topography branch
	153	!
[810]	154	! 809 2012-01-30 13:32:58Z maronga
	155	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	156	!
[808]	157	! 807 2012-01-25 11:53:51Z maronga
	158	! New cpp directive "__check" implemented which is used by check_namelist_files
	159	!
[1]	160	! Revision 1.1 1997/08/11 06:17:45 raasch
	161	! Initial revision (Testversion)
	162	!
	163	!
	164	! Description:
	165	! ------------
[1682]	166	!> Creating grid depending constants
[1]	167	!------------------------------------------------------------------------------!
[1682]	168	SUBROUTINE init_grid
	169
[1]	170
[1320]	171	USE arrays_3d, &
	172	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	173	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	174
[1353]	175	USE control_parameters, &
[1910]	176	ONLY: bc_lr_cyc, bc_ns_cyc, building_height, building_length_x, &
[1320]	177	building_length_y, building_wall_left, building_wall_south, &
	178	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	179	canyon_width_x, canyon_width_y, constant_flux_layer, &
	180	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	181	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	182	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	183	masking_method, maximum_grid_level, message_string, &
[1762]	184	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	185	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
	186	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	187	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	188	wall_adjustment_factor
[1320]	189
	190	USE grid_variables, &
	191	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	192	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	193	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	194
	195	USE indices, &
	196	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	197	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
[1845]	198	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
	199	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
	200	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
	201	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
[1320]	202	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	203	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	204	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	205	wall_flags_9
	206
	207	USE kinds
	208
[1]	209	USE pegrid
	210
	211	IMPLICIT NONE
	212
[1886]	213	INTEGER(iwp) :: bh !< temporary vertical index of building height
	214	INTEGER(iwp) :: blx !< grid point number of building size along x
	215	INTEGER(iwp) :: bly !< grid point number of building size along y
	216	INTEGER(iwp) :: bxl !< index for left building wall
	217	INTEGER(iwp) :: bxr !< index for right building wall
	218	INTEGER(iwp) :: byn !< index for north building wall
	219	INTEGER(iwp) :: bys !< index for south building wall
	220	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
	221	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
	222	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
	223	INTEGER(iwp) :: cxl !< index for left canyon wall
	224	INTEGER(iwp) :: cxr !< index for right canyon wall
	225	INTEGER(iwp) :: cyn !< index for north canyon wall
	226	INTEGER(iwp) :: cys !< index for south canyon wall
	227	INTEGER(iwp) :: gls !< number of lateral ghost points at total model
	228	!< domain boundaries required for multigrid solver
	229	INTEGER(iwp) :: i !< index variable along x
	230	INTEGER(iwp) :: ii !< loop variable for reading topography file
	231	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
	232	INTEGER(iwp) :: j !< index variable along y
	233	INTEGER(iwp) :: k !< index variable along z
	234	INTEGER(iwp) :: l !< loop variable
	235	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
	236	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
	237	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
	238	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
	239	INTEGER(iwp) :: nzb_si !< dummy index for local nzb_s_inner
	240	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
	241	INTEGER(iwp) :: vi !< dummy for vertical influence
[1]	242
[1886]	243	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: &
	244	vertical_influence !< number of vertical grid points above
	245	!< obstacle where adjustment of near-
	246	!< wall mixing length is required
	247
	248	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !< index of
	249	!< north-left corner location to limit
	250	!< near-wall mixing length
	251	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !< north-right
	252	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !< south-left
	253	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !< south-right
	254	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !< distance to
	255	!< adjacent left-facing
	256	!< wall
	257	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !< north-facing
	258	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !< right-facing
	259	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !< right-facing
	260	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography
	261	!< top at cell-center
	262	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate
	263	!< topography indices
	264	!< on u- and v-grid
[1]	265
[1886]	266	LOGICAL :: flag_set = .FALSE. !< steering variable for advection flags
[1]	267
[1886]	268	REAL(wp) :: dx_l !< grid spacing along x on different multigrid level
	269	REAL(wp) :: dy_l !< grid spacing along y on different multigrid level
	270	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
[861]	271
[1886]	272	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for
	273	!< topography height
[1]	274
[667]	275
[1]	276	!
[709]	277	!-- Calculation of horizontal array bounds including ghost layers
[667]	278	nxlg = nxl - nbgp
	279	nxrg = nxr + nbgp
	280	nysg = nys - nbgp
	281	nyng = nyn + nbgp
[709]	282
[667]	283	!
[1]	284	!-- Allocate grid arrays
[1353]	285	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	286	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	287
	288	!
	289	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	290	IF ( dz == -1.0_wp ) THEN
[254]	291	message_string = 'missing dz'
	292	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	293	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	294	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	295	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	296	ENDIF
[94]	297
[1]	298	!
[94]	299	!-- Define the vertical grid levels
	300	IF ( .NOT. ocean ) THEN
	301	!
	302	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	303	!-- The second u-level (k=1) corresponds to the top of the
[94]	304	!-- Prandtl-layer.
[667]	305
	306	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	307	zu(0) = 0.0_wp
	308	! zu(0) = - dz * 0.5_wp
[667]	309	ELSE
[1353]	310	zu(0) = - dz * 0.5_wp
[667]	311	ENDIF
[1353]	312	zu(1) = dz * 0.5_wp
[1]	313
[94]	314	dz_stretch_level_index = nzt+1
	315	dz_stretched = dz
	316	DO k = 2, nzt+1
	317	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	318	dz_stretched = dz_stretched * dz_stretch_factor
	319	dz_stretched = MIN( dz_stretched, dz_max )
	320	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	321	ENDIF
	322	zu(k) = zu(k-1) + dz_stretched
	323	ENDDO
[1]	324
	325	!
[94]	326	!-- Compute the w-levels. They are always staggered half-way between the
[843]	327	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	328	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	329	!-- The top w-level is extrapolated linearly.
[1353]	330	zw(0) = 0.0_wp
[94]	331	DO k = 1, nzt
[1353]	332	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	333	ENDDO
[1353]	334	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	335
[94]	336	ELSE
[1]	337	!
[843]	338	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	339	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	340	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	341	!-- w-level are defined at same height, but staggered from the second level.
	342	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	343	zu(nzt+1) = dz * 0.5_wp
	344	zu(nzt) = - dz * 0.5_wp
[94]	345
	346	dz_stretch_level_index = 0
	347	dz_stretched = dz
	348	DO k = nzt-1, 0, -1
[1418]	349	!
	350	!-- The default value of dz_stretch_level is positive, thus the first
	351	!-- condition is always true. Hence, the second condition is necessary.
	352	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	353	.AND. dz_stretched < dz_max ) THEN
[94]	354	dz_stretched = dz_stretched * dz_stretch_factor
	355	dz_stretched = MIN( dz_stretched, dz_max )
	356	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	357	ENDIF
	358	zu(k) = zu(k+1) - dz_stretched
	359	ENDDO
	360
	361	!
	362	!-- Compute the w-levels. They are always staggered half-way between the
[843]	363	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	364	!-- at the ground. In this case the first u- and w-level are defined at
	365	!-- same height. The top w-level (nzt+1) is not used but set for
	366	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	367	zw(nzt+1) = dz
[1353]	368	zw(nzt) = 0.0_wp
[94]	369	DO k = 0, nzt
[1353]	370	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	371	ENDDO
	372
[843]	373	!
	374	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	375	!-- at same height.
	376	IF ( ibc_uv_b == 0 ) THEN
	377	zu(0) = zw(0)
	378	ENDIF
	379
[94]	380	ENDIF
	381
	382	!
[1]	383	!-- Compute grid lengths.
	384	DO k = 1, nzt+1
	385	dzu(k) = zu(k) - zu(k-1)
[1353]	386	ddzu(k) = 1.0_wp / dzu(k)
[1]	387	dzw(k) = zw(k) - zw(k-1)
[1353]	388	ddzw(k) = 1.0_wp / dzw(k)
[1]	389	ENDDO
	390
	391	DO k = 1, nzt
[1353]	392	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	393	ENDDO
[667]	394
	395	!
[709]	396	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	397	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	398	!-- is only dz/2, but should be dz. Therefore, an additional array
	399	!-- containing with appropriate grid information is created for these
	400	!-- solvers.
[1575]	401	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	402	ALLOCATE( ddzu_pres(1:nzt+1) )
	403	ddzu_pres = ddzu
[864]	404	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	405	ENDIF
[1]	406
	407	!
	408	!-- In case of multigrid method, compute grid lengths and grid factors for the
	409	!-- grid levels
[1575]	410	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	411
	412	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	413	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	414	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	415	f1_mg(nzb+1:nzt,maximum_grid_level), &
	416	f2_mg(nzb+1:nzt,maximum_grid_level), &
	417	f3_mg(nzb+1:nzt,maximum_grid_level) )
	418
	419	dzu_mg(:,maximum_grid_level) = dzu
[667]	420	!
[864]	421	!-- Next line to ensure an equally spaced grid.
	422	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	423
[1]	424	dzw_mg(:,maximum_grid_level) = dzw
	425	nzt_l = nzt
	426	DO l = maximum_grid_level-1, 1, -1
[1353]	427	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	428	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	429	nzt_l = nzt_l / 2
	430	DO k = 2, nzt_l+1
	431	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	432	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	433	ENDDO
	434	ENDDO
	435
	436	nzt_l = nzt
	437	dx_l = dx
	438	dy_l = dy
	439	DO l = maximum_grid_level, 1, -1
[1353]	440	ddx2_mg(l) = 1.0_wp / dx_l**2
	441	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	442	DO k = nzb+1, nzt_l
[1353]	443	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	444	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	445	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	446	f2_mg(k,l) + f3_mg(k,l)
	447	ENDDO
	448	nzt_l = nzt_l / 2
[1353]	449	dx_l = dx_l * 2.0_wp
	450	dy_l = dy_l * 2.0_wp
[1]	451	ENDDO
	452
	453	ENDIF
	454
	455	!
	456	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	457	ddx = 1.0_wp / dx
	458	ddy = 1.0_wp / dy
[1]	459	dx2 = dx * dx
	460	dy2 = dy * dy
[1353]	461	ddx2 = 1.0_wp / dx2
	462	ddy2 = 1.0_wp / dy2
[1]	463
	464	!
	465	!-- Compute the grid-dependent mixing length.
	466	DO k = 1, nzt
[1322]	467	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	468	ENDDO
	469
	470	!
	471	!-- Allocate outer and inner index arrays for topography and set
[114]	472	!-- defaults.
	473	!-- nzb_local has to contain additional layers of ghost points for calculating
	474	!-- the flag arrays needed for the multigrid method
	475	gls = 2**( maximum_grid_level )
[861]	476	IF ( gls < nbgp ) gls = nbgp
[667]	477
[114]	478	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	479	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	480	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	481	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	482	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	483	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	484	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	485	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	486	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	487	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	488	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	489	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	490	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	491	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	492	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	493	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	494	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	495	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	496	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	497	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	498	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	499	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
[1221]	500	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	501	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	502	wall_e_x(nysg:nyng,nxlg:nxrg), &
	503	wall_e_y(nysg:nyng,nxlg:nxrg), &
	504	wall_u(nysg:nyng,nxlg:nxrg), &
	505	wall_v(nysg:nyng,nxlg:nxrg), &
	506	wall_w_x(nysg:nyng,nxlg:nxrg), &
	507	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	508
	509
[667]	510
	511	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	512
[818]	513
[1]	514	nzb_s_inner = nzb; nzb_s_outer = nzb
	515	nzb_u_inner = nzb; nzb_u_outer = nzb
	516	nzb_v_inner = nzb; nzb_v_outer = nzb
	517	nzb_w_inner = nzb; nzb_w_outer = nzb
	518
[1353]	519	rflags_s_inner = 1.0_wp
	520	rflags_invers = 1.0_wp
[1221]	521
[1]	522	!
[19]	523	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	524	!-- form (which does not use surface fluxes) is applied
[1691]	525	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	526	nzb_diff = nzb + 2
	527	ELSE
	528	nzb_diff = nzb + 1
	529	ENDIF
[19]	530	IF ( use_top_fluxes ) THEN
	531	nzt_diff = nzt - 1
	532	ELSE
	533	nzt_diff = nzt
	534	ENDIF
[1]	535
	536	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	537	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	538
[1353]	539	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	540	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	541	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	542	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	543
	544	!
	545	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	546	!-- for the moment,
	547	!-- multiplication with wall_adjustment_factor near the end of this routine
	548	l_wall(nzb,:,:) = l_grid(1)
	549	DO k = nzb+1, nzt
	550	l_wall(k,:,:) = l_grid(k)
	551	ENDDO
	552	l_wall(nzt+1,:,:) = l_grid(nzt)
	553
	554	ALLOCATE ( vertical_influence(nzb:nzt) )
	555	DO k = 1, nzt
	556	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	557	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	558	ENDDO
	559
	560	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	561	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	562	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	563	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	564	'threshold given by only local', &
	565	' &horizontal reduction of near_wall ', &
	566	'mixing length l_wall', &
	567	' &starting from height level k = ', k, '.'
	568	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	569	EXIT
	570	ENDIF
	571	ENDDO
	572	vertical_influence(0) = vertical_influence(1)
	573
[667]	574	DO i = nxlg, nxrg
	575	DO j = nysg, nyng
[1]	576	DO k = nzb_s_inner(j,i) + 1, &
	577	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	578	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	579	ENDDO
	580	ENDDO
	581	ENDDO
	582
	583	!
	584	!-- Set outer and inner index arrays for non-flat topography.
	585	!-- Here consistency checks concerning domain size and periodicity are
	586	!-- necessary.
	587	!-- Within this SELECT CASE structure only nzb_local is initialized
	588	!-- individually depending on the chosen topography type, all other index
	589	!-- arrays are initialized further below.
	590	SELECT CASE ( TRIM( topography ) )
	591
	592	CASE ( 'flat' )
	593	!
[555]	594	!-- nzb_local is required for the multigrid solver
	595	nzb_local = 0
[1]	596
	597	CASE ( 'single_building' )
	598	!
	599	!-- Single rectangular building, by default centered in the middle of the
	600	!-- total domain
	601	blx = NINT( building_length_x / dx )
	602	bly = NINT( building_length_y / dy )
[1675]	603	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	604	IF ( ABS( zw(bh ) - building_height ) == &
	605	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	606
[1322]	607	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	608	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	609	ENDIF
	610	bxl = NINT( building_wall_left / dx )
	611	bxr = bxl + blx
	612
[1322]	613	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	614	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	615	ENDIF
	616	bys = NINT( building_wall_south / dy )
	617	byn = bys + bly
	618
	619	!
	620	!-- Building size has to meet some requirements
	621	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	622	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	623	WRITE( message_string, * ) 'inconsistent building parameters:', &
	624	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	625	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	626	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	627	ENDIF
	628
	629	!
[217]	630	!-- Define the building.
[1]	631	nzb_local = 0
[134]	632	nzb_local(bys:byn,bxl:bxr) = bh
[1]	633
[240]	634	CASE ( 'single_street_canyon' )
	635	!
	636	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	637	!-- The canyon is centered in the other direction by default.
[1322]	638	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	639	!
	640	!-- Street canyon in y direction
	641	cwx = NINT( canyon_width_x / dx )
[1322]	642	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	643	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	644	ENDIF
	645	cxl = NINT( canyon_wall_left / dx )
	646	cxr = cxl + cwx
	647
[1322]	648	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	649	!
	650	!-- Street canyon in x direction
	651	cwy = NINT( canyon_width_y / dy )
[1322]	652	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	653	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	654	ENDIF
	655	cys = NINT( canyon_wall_south / dy )
	656	cyn = cys + cwy
	657
	658	ELSE
[254]	659
	660	message_string = 'no street canyon width given'
	661	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	662
[240]	663	ENDIF
	664
[1675]	665	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	666	IF ( ABS( zw(ch ) - canyon_height ) == &
	667	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	668
[240]	669	dp_level_ind_b = ch
	670	!
	671	!-- Street canyon size has to meet some requirements
[1322]	672	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	673	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	674	( ch < 3 ) ) THEN
[1353]	675	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	676	'&cxl=', cxl, 'cxr=', cxr, &
	677	'cwx=', cwx, &
[254]	678	'ch=', ch, 'nx=', nx, 'ny=', ny
	679	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	680	ENDIF
[1322]	681	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	682	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	683	( ch < 3 ) ) THEN
[1353]	684	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	685	'&cys=', cys, 'cyn=', cyn, &
	686	'cwy=', cwy, &
[254]	687	'ch=', ch, 'nx=', nx, 'ny=', ny
	688	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	689	ENDIF
	690	ENDIF
[1353]	691	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	692	canyon_width_y /= 9999999.9_wp ) THEN
	693	message_string = 'inconsistent canyon parameters:' // &
	694	'&street canyon can only be oriented' // &
[254]	695	'&either in x- or in y-direction'
	696	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	697	ENDIF
	698
	699	nzb_local = ch
[1322]	700	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	701	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	702	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	703	nzb_local(cys+1:cyn-1,:) = 0
	704	ENDIF
	705
[1]	706	CASE ( 'read_from_file' )
[759]	707
[818]	708	ALLOCATE ( topo_height(0:ny,0:nx) )
	709
[759]	710	DO ii = 0, io_blocks-1
	711	IF ( ii == io_group ) THEN
	712
[1]	713	!
[759]	714	!-- Arbitrary irregular topography data in PALM format (exactly
	715	!-- matching the grid size and total domain size)
[1779]	716	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	717	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[759]	718	DO j = ny, 0, -1
	719	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	720	ENDDO
	721
	722	GOTO 12
	723
[1779]	724	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	725	' does not exist'
[759]	726	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	727
[1779]	728	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	729	TRIM( coupling_char )
[759]	730	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	731
	732	12 CLOSE( 90 )
	733
	734	ENDIF
[1804]	735	#if defined( __parallel )
[759]	736	CALL MPI_BARRIER( comm2d, ierr )
	737	#endif
[559]	738	ENDDO
[759]	739
[1]	740	!
	741	!-- Calculate the index height of the topography
	742	DO i = 0, nx
	743	DO j = 0, ny
[1675]	744	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	745	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	746	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	747	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	748	ENDDO
	749	ENDDO
[818]	750
	751	DEALLOCATE ( topo_height )
[1910]	752
[114]	753	!
[1910]	754	!-- Add cyclic or Neumann boundary conditions (additional layers are for
	755	!-- calculating flag arrays needed for the multigrid sover)
	756	IF ( bc_ns_cyc ) THEN
	757	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	758	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	759	ELSE
	760	DO j = -gls, -1
	761	nzb_local(j,0:nx) = nzb_local(0,0:nx)
	762	ENDDO
	763	DO j = ny+1, ny+gls
	764	nzb_local(j,0:nx) = nzb_local(ny,0:nx)
	765	ENDDO
	766	ENDIF
[667]	767
[1910]	768	IF ( bc_lr_cyc ) THEN
	769	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	770	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	771	ELSE
	772	DO i = -gls, -1
	773	nzb_local(:,i) = nzb_local(:,0)
	774	ENDDO
	775	DO i = nx+1, nx+gls
	776	nzb_local(:,i) = nzb_local(:,nx)
	777	ENDDO
	778	ENDIF
	779
[1]	780	CASE DEFAULT
	781	!
	782	!-- The DEFAULT case is reached either if the parameter topography
[217]	783	!-- contains a wrong character string or if the user has defined a special
[1]	784	!-- case in the user interface. There, the subroutine user_init_grid
	785	!-- checks which of these two conditions applies.
[114]	786	CALL user_init_grid( gls, nzb_local )
[1]	787
	788	END SELECT
	789	!
[861]	790	!-- Determine the maximum level of topography. Furthermore it is used for
	791	!-- steering the degradation of order of the applied advection scheme.
[978]	792	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	793	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	794	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	795	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	796	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	797	nest_domain ) &
	798	THEN
	799	nzb_max = nzt
[978]	800	ENDIF
	801
[861]	802	!
[1]	803	!-- Consistency checks and index array initialization are only required for
[217]	804	!-- non-flat topography, also the initialization of topography height arrays
[49]	805	!-- zu_s_inner and zw_w_inner
[1]	806	IF ( TRIM( topography ) /= 'flat' ) THEN
	807
	808	!
	809	!-- Consistency checks
	810	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	811	WRITE( message_string, * ) 'nzb_local values are outside the', &
	812	'model domain', &
	813	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	814	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	815	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	816	ENDIF
	817
[1910]	818	IF ( bc_lr_cyc ) THEN
[1353]	819	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	820	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	821	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	822	' boundary condition in x-direction'
	823	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	824	ENDIF
	825	ENDIF
[1910]	826	IF ( bc_ns_cyc ) THEN
[1353]	827	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	828	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	829	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	830	' boundary condition in y-direction'
	831	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	832	ENDIF
	833	ENDIF
	834
[217]	835	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	836	!
[217]	837	!-- The array nzb_local as defined using the 'cell_edge' convention
	838	!-- describes the actual total size of topography which is defined at the
	839	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	840	!-- on the topography walls in y-direction. However, PALM uses individual
	841	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	842	!-- Therefore, the extent of topography in nzb_local is now reduced by
	843	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	844	!-- to form the basis for nzb_s_inner.
	845	DO j = -gls, ny + gls
	846	DO i = -gls, nx
	847	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	848	ENDDO
[134]	849	ENDDO
[217]	850	!-- apply cyclic boundary conditions in x-direction
	851	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	852	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	853	DO i = -gls, nx + gls
	854	DO j = -gls, ny
	855	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	856	ENDDO
[134]	857	ENDDO
[217]	858	!-- apply cyclic boundary conditions in y-direction
	859	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	860	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	861	ENDIF
[134]	862
[1]	863	!
	864	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	865	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	866	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	867
	868	!
	869	!-- Initialize remaining index arrays:
	870	!-- first pre-initialize them with nzb_s_inner...
	871	nzb_u_inner = nzb_s_inner
	872	nzb_u_outer = nzb_s_inner
	873	nzb_v_inner = nzb_s_inner
	874	nzb_v_outer = nzb_s_inner
	875	nzb_w_outer = nzb_s_inner
	876	nzb_s_outer = nzb_s_inner
	877
	878	!
	879	!-- ...then extend pre-initialized arrays in their according directions
	880	!-- based on nzb_local using nzb_tmp as a temporary global index array
	881
	882	!
	883	!-- nzb_s_outer:
	884	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	885	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	886	DO j = -1, ny + 1
	887	DO i = 0, nx
[1353]	888	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	889	nzb_local(j,i+1) )
	890	ENDDO
	891	ENDDO
	892	DO i = nxl, nxr
	893	DO j = nys, nyn
[1353]	894	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	895	nzb_tmp(j+1,i) )
	896	ENDDO
	897	!
	898	!-- non-cyclic boundary conditions (overwritten by call of
	899	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	900	IF ( nys == 0 ) THEN
	901	j = -1
	902	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	903	ENDIF
[1743]	904	IF ( nyn == ny ) THEN
[1]	905	j = ny + 1
	906	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	907	ENDIF
	908	ENDDO
	909	!
	910	!-- nzb_w_outer:
	911	!-- identical to nzb_s_outer
	912	nzb_w_outer = nzb_s_outer
	913
	914	!
	915	!-- nzb_u_inner:
	916	!-- extend nzb_local rightwards only
[667]	917	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	918	DO j = -1, ny + 1
	919	DO i = 0, nx + 1
	920	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	921	ENDDO
	922	ENDDO
[667]	923	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	924
	925	!
	926	!-- nzb_u_outer:
	927	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	928	DO i = nxl, nxr
	929	DO j = nys, nyn
[1353]	930	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	931	nzb_tmp(j+1,i) )
	932	ENDDO
	933	!
	934	!-- non-cyclic boundary conditions (overwritten by call of
	935	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	936	IF ( nys == 0 ) THEN
	937	j = -1
	938	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	939	ENDIF
[1743]	940	IF ( nyn == ny ) THEN
[1]	941	j = ny + 1
	942	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	943	ENDIF
	944	ENDDO
	945
	946	!
	947	!-- nzb_v_inner:
	948	!-- extend nzb_local northwards only
[667]	949	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	950	DO i = -1, nx + 1
	951	DO j = 0, ny + 1
	952	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	953	ENDDO
	954	ENDDO
[1886]	955	nzb_v_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	956
	957	!
	958	!-- nzb_v_outer:
	959	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	960	DO j = nys, nyn
	961	DO i = nxl, nxr
[1353]	962	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	963	nzb_tmp(j,i+1) )
	964	ENDDO
	965	!
	966	!-- non-cyclic boundary conditions (overwritten by call of
	967	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	968	IF ( nxl == 0 ) THEN
	969	i = -1
	970	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	971	ENDIF
	972	IF ( nxr == nx ) THEN
	973	i = nx + 1
	974	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	975	ENDIF
	976	ENDDO
[1804]	977
[1]	978	!
	979	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	980	!-- boundary conditions, if applicable.
	981	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	982	!-- they do not require exchange and are not included here.
	983	CALL exchange_horiz_2d_int( nzb_u_inner )
	984	CALL exchange_horiz_2d_int( nzb_u_outer )
	985	CALL exchange_horiz_2d_int( nzb_v_inner )
	986	CALL exchange_horiz_2d_int( nzb_v_outer )
	987	CALL exchange_horiz_2d_int( nzb_w_outer )
	988	CALL exchange_horiz_2d_int( nzb_s_outer )
	989
[49]	990	!
	991	!-- Allocate and set the arrays containing the topography height
	992	IF ( myid == 0 ) THEN
	993
	994	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	995
	996	DO i = 0, nx + 1
	997	DO j = 0, ny + 1
	998	zu_s_inner(i,j) = zu(nzb_local(j,i))
	999	zw_w_inner(i,j) = zw(nzb_local(j,i))
	1000	ENDDO
	1001	ENDDO
	1002
	1003	ENDIF
[1221]	1004	!
	1005	!-- Set flag arrays to be used for masking of grid points
	1006	DO i = nxlg, nxrg
	1007	DO j = nysg, nyng
	1008	DO k = nzb, nzt+1
[1353]	1009	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	1010	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	1011	ENDDO
	1012	ENDDO
	1013	ENDDO
[1804]	1014
[1]	1015	ENDIF
	1016
	1017	!
	1018	!-- Set the individual index arrays which define the k index from which on
	1019	!-- the usual finite difference form (which does not use surface fluxes) is
	1020	!-- applied
[1691]	1021	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	1022	nzb_diff_u = nzb_u_inner + 2
	1023	nzb_diff_v = nzb_v_inner + 2
	1024	nzb_diff_s_inner = nzb_s_inner + 2
	1025	nzb_diff_s_outer = nzb_s_outer + 2
	1026	ELSE
	1027	nzb_diff_u = nzb_u_inner + 1
	1028	nzb_diff_v = nzb_v_inner + 1
	1029	nzb_diff_s_inner = nzb_s_inner + 1
	1030	nzb_diff_s_outer = nzb_s_outer + 1
	1031	ENDIF
	1032
	1033	!
	1034	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	1035	!-- for limitation of near-wall mixing length l_wall further below
	1036	corner_nl = 0
	1037	corner_nr = 0
	1038	corner_sl = 0
	1039	corner_sr = 0
	1040	wall_l = 0
	1041	wall_n = 0
	1042	wall_r = 0
	1043	wall_s = 0
	1044
	1045	DO i = nxl, nxr
	1046	DO j = nys, nyn
	1047	!
	1048	!-- u-component
	1049	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1050	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1051	fym(j,i) = 0.0_wp
	1052	fyp(j,i) = 1.0_wp
[1]	1053	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1054	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1055	fym(j,i) = 1.0_wp
	1056	fyp(j,i) = 0.0_wp
[1]	1057	ENDIF
	1058	!
	1059	!-- v-component
	1060	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1061	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1062	fxm(j,i) = 0.0_wp
	1063	fxp(j,i) = 1.0_wp
[1]	1064	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1065	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1066	fxm(j,i) = 1.0_wp
	1067	fxp(j,i) = 0.0_wp
[1]	1068	ENDIF
	1069	!
	1070	!-- w-component, also used for scalars, separate arrays for shear
	1071	!-- production of tke
	1072	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1073	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1074	wall_w_y(j,i) = 1.0_wp
	1075	fwym(j,i) = 0.0_wp
	1076	fwyp(j,i) = 1.0_wp
[1]	1077	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1078	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1079	wall_w_y(j,i) = 1.0_wp
	1080	fwym(j,i) = 1.0_wp
	1081	fwyp(j,i) = 0.0_wp
[1]	1082	ENDIF
	1083	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1084	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1085	wall_w_x(j,i) = 1.0_wp
	1086	fwxm(j,i) = 0.0_wp
	1087	fwxp(j,i) = 1.0_wp
[1]	1088	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1089	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1090	wall_w_x(j,i) = 1.0_wp
	1091	fwxm(j,i) = 1.0_wp
	1092	fwxp(j,i) = 0.0_wp
[1]	1093	ENDIF
	1094	!
	1095	!-- Wall and corner locations inside buildings for limitation of
	1096	!-- near-wall mixing length l_wall
	1097	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1098
	1099	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1100
	1101	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1102	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1103	nzb_s_inner(j,i-1) ) + 1
	1104	ENDIF
	1105
	1106	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1107	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1108	nzb_s_inner(j,i+1) ) + 1
	1109	ENDIF
	1110
	1111	ENDIF
	1112
	1113	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1114
	1115	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1116	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1117	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1118	nzb_s_inner(j,i-1) ) + 1
	1119	ENDIF
	1120
	1121	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1122	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1123	nzb_s_inner(j,i+1) ) + 1
	1124	ENDIF
	1125
	1126	ENDIF
	1127
	1128	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1129	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1130	ENDIF
	1131
	1132	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1133	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1134	ENDIF
	1135
	1136	ENDDO
	1137	ENDDO
	1138
	1139	!
[114]	1140	!-- Calculate wall flag arrays for the multigrid method
[1575]	1141	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1142	!
	1143	!-- Gridpoint increment of the current level
	1144	inc = 1
	1145
	1146	DO l = maximum_grid_level, 1 , -1
	1147
	1148	nxl_l = nxl_mg(l)
	1149	nxr_l = nxr_mg(l)
	1150	nys_l = nys_mg(l)
	1151	nyn_l = nyn_mg(l)
	1152	nzt_l = nzt_mg(l)
	1153
	1154	!
	1155	!-- Assign the flag level to be calculated
	1156	SELECT CASE ( l )
	1157	CASE ( 1 )
	1158	flags => wall_flags_1
	1159	CASE ( 2 )
	1160	flags => wall_flags_2
	1161	CASE ( 3 )
	1162	flags => wall_flags_3
	1163	CASE ( 4 )
	1164	flags => wall_flags_4
	1165	CASE ( 5 )
	1166	flags => wall_flags_5
	1167	CASE ( 6 )
	1168	flags => wall_flags_6
	1169	CASE ( 7 )
	1170	flags => wall_flags_7
	1171	CASE ( 8 )
	1172	flags => wall_flags_8
	1173	CASE ( 9 )
	1174	flags => wall_flags_9
	1175	CASE ( 10 )
	1176	flags => wall_flags_10
	1177	END SELECT
	1178
	1179	!
	1180	!-- Depending on the grid level, set the respective bits in case of
	1181	!-- neighbouring walls
	1182	!-- Bit 0: wall to the bottom
	1183	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1184	!-- Bit 2: wall to the south
	1185	!-- Bit 3: wall to the north
	1186	!-- Bit 4: wall to the left
	1187	!-- Bit 5: wall to the right
[116]	1188	!-- Bit 6: inside building
[114]	1189
	1190	flags = 0
	1191
[927]	1192	!
	1193	!-- In case of masking method, flags are not set and multigrid method
	1194	!-- works like FFT-solver
[1902]	1195	IF ( psolver == 'multigrid' .AND. .NOT. masking_method ) THEN
[927]	1196
	1197	DO i = nxl_l-1, nxr_l+1
	1198	DO j = nys_l-1, nyn_l+1
	1199	DO k = nzb, nzt_l+1
[114]	1200
	1201	!
[927]	1202	!-- Inside/outside building (inside building does not need
	1203	!-- further tests for walls)
	1204	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1205
[927]	1206	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1207
[927]	1208	ELSE
[114]	1209	!
[927]	1210	!-- Bottom wall
	1211	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1212	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1213	ENDIF
[114]	1214	!
[927]	1215	!-- South wall
	1216	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1217	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1218	ENDIF
[114]	1219	!
[927]	1220	!-- North wall
	1221	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1222	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1223	ENDIF
[114]	1224	!
[927]	1225	!-- Left wall
	1226	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1227	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1228	ENDIF
[114]	1229	!
[927]	1230	!-- Right wall
	1231	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1232	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1233	ENDIF
	1234
[114]	1235	ENDIF
	1236
[927]	1237	ENDDO
[114]	1238	ENDDO
	1239	ENDDO
	1240
[927]	1241	ENDIF
	1242
[114]	1243	!
	1244	!-- Test output of flag arrays
[145]	1245	! i = nxl_l
	1246	! WRITE (9,*) ' '
	1247	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1248	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1249	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1250	! DO k = nzt_l+1, nzb, -1
	1251	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1252	! ENDDO
[114]	1253
	1254	inc = inc * 2
	1255
	1256	ENDDO
	1257
	1258	ENDIF
[861]	1259	!
	1260	!-- Allocate flags needed for masking walls.
[1677]	1261	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1262	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1263	wall_flags_0 = 0
	1264	wall_flags_00 = 0
[114]	1265
[1886]	1266	IF ( scalar_advec == 'ws-scheme' .OR. &
[1557]	1267	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1268	!
[861]	1269	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1270	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1271	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1272	!-- grid points.
	1273	DO i = nxl, nxr
	1274	DO j = nys, nyn
	1275	DO k = nzb_s_inner(j,i)+1, nzt
	1276	!
	1277	!-- scalar - x-direction
	1278	!-- WS1 (0), WS3 (1), WS5 (2)
[1886]	1279	IF ( ( k <= nzb_s_inner(j,i+1) .OR. k <= nzb_s_inner(j,i+2) &
	1280	.OR. k <= nzb_s_inner(j,i-1) ) &
	1281	.OR. ( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
[1762]	1282	.AND. i == nxl ) .OR. &
	1283	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1284	.AND. i == nxr ) ) &
	1285	THEN
[861]	1286	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
[1886]	1287	ELSEIF ( ( k <= nzb_s_inner(j,i+3) .AND. k > nzb_s_inner(j,i+1)&
	1288	.AND. k > nzb_s_inner(j,i+2)&
	1289	.AND. k > nzb_s_inner(j,i-1)&
	1290	) .OR. &
	1291	( k <= nzb_s_inner(j,i-2) .AND. k > nzb_s_inner(j,i+1)&
	1292	.AND. k > nzb_s_inner(j,i+2)&
	1293	.AND. k > nzb_s_inner(j,i-1)&
	1294	) &
[1762]	1295	.OR. &
	1296	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1297	.AND. i == nxr-1 ) .OR. &
	1298	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1299	.AND. i == nxlu ) ) &
	1300	THEN
[861]	1301	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
[1886]	1302	ELSEIF ( k > nzb_s_inner(j,i+1) .AND. k > nzb_s_inner(j,i+2) &
	1303	.AND. k > nzb_s_inner(j,i+3) .AND. k > nzb_s_inner(j,i-1) &
	1304	.AND. k > nzb_s_inner(j,i-2) ) &
	1305	THEN
[861]	1306	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1307	ENDIF
	1308	!
	1309	!-- scalar - y-direction
	1310	!-- WS1 (3), WS3 (4), WS5 (5)
[1886]	1311	IF ( ( k <= nzb_s_inner(j+1,i) .OR. k <= nzb_s_inner(j+2,i) &
	1312	.OR. k <= nzb_s_inner(j-1,i) ) &
	1313	.OR. &
[1762]	1314	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1315	.AND. j == nys ) .OR. &
	1316	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1317	.AND. j == nyn ) ) &
	1318	THEN
[861]	1319	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
[1762]	1320	!
[861]	1321	!-- WS3
[1886]	1322	ELSEIF ( ( k <= nzb_s_inner(j+3,i) .AND. k > nzb_s_inner(j+1,i)&
	1323	.AND. k > nzb_s_inner(j+2,i)&
	1324	.AND. k > nzb_s_inner(j-1,i)&
	1325	) .OR. &
	1326	( k <= nzb_s_inner(j-2,i) .AND. k > nzb_s_inner(j+1,i)&
	1327	.AND. k > nzb_s_inner(j+2,i)&
	1328	.AND. k > nzb_s_inner(j-1,i)&
	1329	) &
	1330	.OR. &
[1762]	1331	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1332	.AND. j == nysv ) .OR. &
	1333	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1334	.AND. j == nyn-1 ) ) &
	1335	THEN
[861]	1336	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
[1762]	1337	!
[861]	1338	!-- WS5
[1886]	1339	ELSEIF ( k > nzb_s_inner(j+1,i) .AND. k > nzb_s_inner(j+2,i) &
	1340	.AND. k > nzb_s_inner(j+3,i) .AND. k > nzb_s_inner(j-1,i) &
	1341	.AND. k > nzb_s_inner(j-2,i) ) &
	1342	THEN
[861]	1343	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1344	ENDIF
	1345	!
	1346	!-- scalar - z-direction
	1347	!-- WS1 (6), WS3 (7), WS5 (8)
	1348	flag_set = .FALSE.
	1349	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1350	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1351	flag_set = .TRUE.
	1352	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1353	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1354	flag_set = .TRUE.
	1355	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1356	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1357	ENDIF
[1886]	1358
[861]	1359	ENDDO
	1360	ENDDO
	1361	ENDDO
	1362	ENDIF
	1363
	1364	IF ( momentum_advec == 'ws-scheme' ) THEN
	1365	!
	1366	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1367	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1368	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1369	!-- grid points.
	1370	DO i = nxl, nxr
	1371	DO j = nys, nyn
[1580]	1372	DO k = nzb+1, nzt
[861]	1373	!
[1580]	1374	!-- At first, set flags to WS1.
	1375	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1376	!-- in order to handle the left/south flux.
	1377	!-- near vertical walls.
	1378	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1379	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1380	!
[861]	1381	!-- u component - x-direction
	1382	!-- WS1 (9), WS3 (10), WS5 (11)
[1886]	1383	IF ( k <= nzb_u_inner(j,i+1) .OR. &
[1762]	1384	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1385	.AND. i <= nxlu ) .OR. &
	1386	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1387	.AND. i == nxr ) ) &
	1388	THEN
[1580]	1389	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[1886]	1390	ELSEIF ( ( k <= nzb_u_inner(j,i+2) .AND. &
	1391	k > nzb_u_inner(j,i+1) ) .OR. &
	1392	k <= nzb_u_inner(j,i-1) &
	1393	.OR. &
[1762]	1394	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1395	.AND. i == nxr-1 ) .OR. &
	1396	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1397	.AND. i == nxlu+1) ) &
	1398	THEN
[861]	1399	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1400	!
	1401	!-- Clear flag for WS1
	1402	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[1886]	1403	ELSEIF ( k > nzb_u_inner(j,i+1) .AND. k > nzb_u_inner(j,i+2) &
	1404	.AND. k > nzb_u_inner(j,i-1) ) &
	1405	THEN
[861]	1406	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1407	!
	1408	!-- Clear flag for WS1
	1409	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1410	ENDIF
	1411	!
	1412	!-- u component - y-direction
	1413	!-- WS1 (12), WS3 (13), WS5 (14)
[1762]	1414	IF ( k <= nzb_u_inner(j+1,i) .OR. &
	1415	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1416	.AND. j == nys ) .OR. &
	1417	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1418	.AND. j == nyn ) ) &
	1419	THEN
	1420	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[1886]	1421	ELSEIF ( ( k <= nzb_u_inner(j+2,i) .AND. &
	1422	k > nzb_u_inner(j+1,i) ) .OR. &
	1423	k <= nzb_u_inner(j-1,i) &
	1424	.OR. &
[1762]	1425	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1426	.AND. j == nysv ) .OR. &
	1427	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1428	.AND. j == nyn-1 ) ) &
	1429	THEN
[861]	1430	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1431	!
	1432	!-- Clear flag for WS1
	1433	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[1886]	1434	ELSEIF ( k > nzb_u_inner(j+1,i) .AND. k > nzb_u_inner(j+2,i) &
	1435	.AND. k > nzb_u_inner(j-1,i) ) &
	1436	THEN
[861]	1437	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1438	!
	1439	!-- Clear flag for WS1
	1440	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1441	ENDIF
	1442	!
	1443	!-- u component - z-direction
	1444	!-- WS1 (15), WS3 (16), WS5 (17)
	1445	flag_set = .FALSE.
	1446	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1447	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1448	flag_set = .TRUE.
	1449	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1450	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1451	flag_set = .TRUE.
	1452	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1453	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1454	ENDIF
	1455
	1456	ENDDO
	1457	ENDDO
	1458	ENDDO
	1459
	1460	DO i = nxl, nxr
	1461	DO j = nys, nyn
[1580]	1462	DO k = nzb+1, nzt
[861]	1463	!
[1580]	1464	!-- At first, set flags to WS1.
	1465	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1466	!-- in order to handle the left/south flux.
	1467	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1468	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1469	!
[861]	1470	!-- v component - x-direction
	1471	!-- WS1 (18), WS3 (19), WS5 (20)
[1762]	1472	IF ( k <= nzb_v_inner(j,i+1) .OR. &
	1473	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1474	.AND. i == nxl ) .OR. &
	1475	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1476	.AND. i == nxr ) ) &
	1477	THEN
	1478	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1479	!
[861]	1480	!-- WS3
[1886]	1481	ELSEIF ( ( k <= nzb_v_inner(j,i+2) .AND. &
	1482	k > nzb_v_inner(j,i+1) ) .OR. &
	1483	k <= nzb_v_inner(j,i-1) &
[1762]	1484	.OR. &
	1485	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1486	.AND. i == nxr-1 ) .OR. &
	1487	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1488	.AND. i == nxlu ) ) &
	1489	THEN
[861]	1490	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1491	!
	1492	!-- Clear flag for WS1
	1493	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[1886]	1494	ELSEIF ( k > nzb_v_inner(j,i+1) .AND. k > nzb_v_inner(j,i+2) &
	1495	.AND. k > nzb_v_inner(j,i-1) ) &
	1496	THEN
[861]	1497	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1498	!
	1499	!-- Clear flag for WS1
	1500	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1501	ENDIF
	1502	!
	1503	!-- v component - y-direction
	1504	!-- WS1 (21), WS3 (22), WS5 (23)
[1762]	1505	IF ( k <= nzb_v_inner(j+1,i) .OR. &
	1506	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1507	.AND. j <= nysv ) .OR. &
	1508	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1509	.AND. j == nyn ) ) &
	1510	THEN
	1511	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[1886]	1512	ELSEIF ( ( k <= nzb_v_inner(j+2,i) .AND. &
	1513	k > nzb_v_inner(j+1,i) ) .OR. &
	1514	k <= nzb_v_inner(j-1,i) &
	1515	.OR. &
[1762]	1516	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1517	.AND. j == nysv+1) .OR. &
	1518	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1519	.AND. j == nyn-1 ) ) &
	1520	THEN
[861]	1521	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1522	!
	1523	!-- Clear flag for WS1
	1524	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[1886]	1525	ELSEIF ( k > nzb_v_inner(j+1,i) .AND. k > nzb_v_inner(j+2,i) &
	1526	.AND. k > nzb_v_inner(j-1,i) ) &
	1527	THEN
[861]	1528	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1529	!
	1530	!-- Clear flag for WS1
	1531	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1532	ENDIF
	1533	!
	1534	!-- v component - z-direction
	1535	!-- WS1 (24), WS3 (25), WS5 (26)
	1536	flag_set = .FALSE.
	1537	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1538	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1539	flag_set = .TRUE.
	1540	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1541	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1542	flag_set = .TRUE.
	1543	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1544	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1545	ENDIF
	1546
	1547	ENDDO
	1548	ENDDO
	1549	ENDDO
	1550	DO i = nxl, nxr
	1551	DO j = nys, nyn
[1580]	1552	DO k = nzb+1, nzt
[861]	1553	!
[1580]	1554	!-- At first, set flags to WS1.
	1555	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1556	!-- in order to handle the left/south flux.
	1557	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1558	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1559	!
[861]	1560	!-- w component - x-direction
	1561	!-- WS1 (27), WS3 (28), WS5 (29)
[1762]	1562	IF ( k <= nzb_w_inner(j,i+1) .OR. &
	1563	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1564	.AND. i == nxl ) .OR. &
	1565	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1566	.AND. i == nxr ) ) &
	1567	THEN
	1568	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[1886]	1569	ELSEIF ( ( k <= nzb_w_inner(j,i+2) .AND. &
	1570	k > nzb_w_inner(j,i+1) ) .OR. &
	1571	k <= nzb_w_inner(j,i-1) &
	1572	.OR. &
[1762]	1573	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1574	.AND. i == nxr-1 ) .OR. &
	1575	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1576	.AND. i == nxlu ) ) &
	1577	THEN
[861]	1578	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1579	!
	1580	!-- Clear flag for WS1
	1581	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[1886]	1582	ELSEIF ( k > nzb_w_inner(j,i+1) .AND. k > nzb_w_inner(j,i+2) &
	1583	.AND. k > nzb_w_inner(j,i-1) ) &
	1584	THEN
[861]	1585	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1586	!
	1587	!-- Clear flag for WS1
	1588	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1589	ENDIF
	1590	!
	1591	!-- w component - y-direction
	1592	!-- WS1 (30), WS3 (31), WS5 (32)
[1762]	1593	IF ( k <= nzb_w_inner(j+1,i) .OR. &
	1594	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1595	.AND. j == nys ) .OR. &
	1596	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1597	.AND. j == nyn ) ) &
	1598	THEN
	1599	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[1886]	1600	ELSEIF ( ( k <= nzb_w_inner(j+2,i) .AND. &
	1601	k > nzb_w_inner(j+1,i) ) .OR. &
	1602	k <= nzb_w_inner(j-1,i) &
	1603	.OR. &
[1762]	1604	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1605	.AND. j == nysv ) .OR. &
	1606	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1607	.AND. j == nyn-1 ) ) &
	1608	THEN
[861]	1609	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1610	!
	1611	!-- Clear flag for WS1
	1612	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[1886]	1613	ELSEIF ( k > nzb_w_inner(j+1,i) .AND. k > nzb_w_inner(j+2,i) &
	1614	.AND. k > nzb_w_inner(j-1,i) ) &
	1615	THEN
[1221]	1616	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1617	!
	1618	!-- Clear flag for WS1
	1619	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1620	ENDIF
	1621	!
	1622	!-- w component - z-direction
[1679]	1623	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1624	flag_set = .FALSE.
	1625	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1626	.OR. k == nzt ) THEN
	1627	!
	1628	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1629	!-- set, although this is not a prognostic level. However,
	1630	!-- contrary to the advection of u,v and s this is necessary
	1631	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1632	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1633	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1634	flag_set = .TRUE.
	1635	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1636	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1637	flag_set = .TRUE.
	1638	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1639	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1640	ENDIF
	1641
	1642	ENDDO
	1643	ENDDO
	1644	ENDDO
	1645
	1646	ENDIF
	1647
	1648	!
[1677]	1649	!-- Exchange 3D integer wall_flags.
	1650	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1651	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1652	!
	1653	!-- Exchange ghost points for advection flags
	1654	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1655	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1656	!
	1657	!-- Set boundary flags at inflow and outflow boundary in case of
	1658	!-- non-cyclic boundary conditions.
[1762]	1659	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1677]	1660	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1661	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1662	ENDIF
	1663
[1762]	1664	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
[1677]	1665	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1666	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1667	ENDIF
	1668
[1762]	1669	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
[1677]	1670	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1671	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1672	ENDIF
	1673
[1762]	1674	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1677]	1675	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1676	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1677	ENDIF
	1678
	1679	ENDIF
	1680
	1681	!
[1]	1682	!-- In case of topography: limit near-wall mixing length l_wall further:
	1683	!-- Go through all points of the subdomain one by one and look for the closest
	1684	!-- surface
	1685	IF ( TRIM(topography) /= 'flat' ) THEN
	1686	DO i = nxl, nxr
	1687	DO j = nys, nyn
	1688
	1689	nzb_si = nzb_s_inner(j,i)
	1690	vi = vertical_influence(nzb_si)
	1691
	1692	IF ( wall_n(j,i) > 0 ) THEN
	1693	!
	1694	!-- North wall (y distance)
	1695	DO k = wall_n(j,i), nzb_si
[1353]	1696	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1697	ENDDO
	1698	!
	1699	!-- Above North wall (yz distance)
	1700	DO k = nzb_si + 1, nzb_si + vi
[1353]	1701	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1702	SQRT( 0.25_wp * dy**2 + &
[1]	1703	( zu(k) - zw(nzb_si) )**2 ) )
	1704	ENDDO
	1705	!
	1706	!-- Northleft corner (xy distance)
	1707	IF ( corner_nl(j,i) > 0 ) THEN
	1708	DO k = corner_nl(j,i), nzb_si
	1709	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1710	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1711	ENDDO
	1712	!
	1713	!-- Above Northleft corner (xyz distance)
	1714	DO k = nzb_si + 1, nzb_si + vi
[1353]	1715	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1716	SQRT( 0.25_wp * (dx2 + dy2) + &
	1717	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1718	ENDDO
	1719	ENDIF
	1720	!
	1721	!-- Northright corner (xy distance)
	1722	IF ( corner_nr(j,i) > 0 ) THEN
	1723	DO k = corner_nr(j,i), nzb_si
[1353]	1724	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1725	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1726	ENDDO
	1727	!
	1728	!-- Above northright corner (xyz distance)
	1729	DO k = nzb_si + 1, nzb_si + vi
[1353]	1730	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1731	SQRT( 0.25_wp * (dx2 + dy2) + &
	1732	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1733	ENDDO
	1734	ENDIF
	1735	ENDIF
	1736
	1737	IF ( wall_s(j,i) > 0 ) THEN
	1738	!
	1739	!-- South wall (y distance)
	1740	DO k = wall_s(j,i), nzb_si
[1353]	1741	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1742	ENDDO
	1743	!
	1744	!-- Above south wall (yz distance)
[1353]	1745	DO k = nzb_si + 1, nzb_si + vi
	1746	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1747	SQRT( 0.25_wp * dy**2 + &
[1]	1748	( zu(k) - zw(nzb_si) )**2 ) )
	1749	ENDDO
	1750	!
	1751	!-- Southleft corner (xy distance)
	1752	IF ( corner_sl(j,i) > 0 ) THEN
	1753	DO k = corner_sl(j,i), nzb_si
[1353]	1754	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1755	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1756	ENDDO
	1757	!
	1758	!-- Above southleft corner (xyz distance)
	1759	DO k = nzb_si + 1, nzb_si + vi
[1353]	1760	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1761	SQRT( 0.25_wp * (dx2 + dy2) + &
	1762	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1763	ENDDO
	1764	ENDIF
	1765	!
	1766	!-- Southright corner (xy distance)
	1767	IF ( corner_sr(j,i) > 0 ) THEN
	1768	DO k = corner_sr(j,i), nzb_si
[1353]	1769	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1770	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1771	ENDDO
	1772	!
	1773	!-- Above southright corner (xyz distance)
	1774	DO k = nzb_si + 1, nzb_si + vi
[1353]	1775	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1776	SQRT( 0.25_wp * (dx2 + dy2) + &
	1777	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1778	ENDDO
	1779	ENDIF
	1780
	1781	ENDIF
	1782
	1783	IF ( wall_l(j,i) > 0 ) THEN
	1784	!
	1785	!-- Left wall (x distance)
	1786	DO k = wall_l(j,i), nzb_si
[1353]	1787	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1788	ENDDO
	1789	!
	1790	!-- Above left wall (xz distance)
	1791	DO k = nzb_si + 1, nzb_si + vi
[1353]	1792	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1793	SQRT( 0.25_wp * dx**2 + &
	1794	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1795	ENDDO
	1796	ENDIF
	1797
	1798	IF ( wall_r(j,i) > 0 ) THEN
	1799	!
	1800	!-- Right wall (x distance)
	1801	DO k = wall_r(j,i), nzb_si
[1353]	1802	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1803	ENDDO
	1804	!
	1805	!-- Above right wall (xz distance)
	1806	DO k = nzb_si + 1, nzb_si + vi
[1353]	1807	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1808	SQRT( 0.25_wp * dx**2 + &
[1]	1809	( zu(k) - zw(nzb_si) )**2 ) )
	1810	ENDDO
	1811
	1812	ENDIF
	1813
	1814	ENDDO
	1815	ENDDO
	1816
	1817	ENDIF
	1818
	1819	!
	1820	!-- Multiplication with wall_adjustment_factor
	1821	l_wall = wall_adjustment_factor * l_wall
	1822
	1823	!
[709]	1824	!-- Set lateral boundary conditions for l_wall
[667]	1825	CALL exchange_horiz( l_wall, nbgp )
	1826
[1]	1827	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1828	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1829
	1830
	1831	END SUBROUTINE init_grid

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