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source: palm/trunk/SOURCE/init_grid.f90 @ 1941

Last change on this file since 1941 was 1932, checked in by suehring, 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	! -----------------
[1932]	21	!
	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: init_grid.f90 1932 2016-06-10 12:09:21Z raasch $
	26	!
[1932]	27	! 1931 2016-06-10 12:06:59Z suehring
	28	! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid
	29	!
[1911]	30	! 1910 2016-05-26 06:49:46Z raasch
	31	! Bugfix: if topography is read from file, Neumann conditions are used for the
	32	! nzb_local array (instead of cyclic conditions) in case that non-cyclic
	33	! boundary conditions are switched on for the run
	34	!
[1903]	35	! 1902 2016-05-09 11:18:56Z suehring
[1910]	36	! Set topography flags for multigrid solver only (not for multigrid_fast)
[1903]	37	!
[1887]	38	! 1886 2016-04-21 11:20:47Z suehring
	39	! Bugfix: setting advection flags near walls
	40	! reformulated index values for nzb_v_inner
	41	! variable discriptions added in declaration block
	42	!
[1846]	43	! 1845 2016-04-08 08:29:13Z raasch
	44	! nzb_2d removed
	45	!
[1805]	46	! 1804 2016-04-05 16:30:18Z maronga
	47	! Removed code for parameter file check (__check)
	48	!
[1780]	49	! 1779 2016-03-03 08:01:28Z raasch
	50	! coupling_char is trimmed at every place it occurs, because it can have
	51	! different length now
	52	!
[1763]	53	! 1762 2016-02-25 12:31:13Z hellstea
	54	! Introduction of nested domain feature
	55	!
[1744]	56	! 1743 2016-01-13 10:23:51Z raasch
	57	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	58	! total domain
	59	!
[1692]	60	! 1691 2015-10-26 16:17:44Z maronga
	61	! Renamed prandtl_layer to constant_flux_layer.
	62	!
[1683]	63	! 1682 2015-10-07 23:56:08Z knoop
	64	! Code annotations made doxygen readable
	65	!
[1678]	66	! 1677 2015-10-02 13:25:23Z boeske
	67	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	68	!
[1676]	69	! 1675 2015-10-02 08:28:59Z gronemeier
	70	! Bugfix: Definition of topography grid levels
	71	!
[1662]	72	! 1660 2015-09-21 08:15:16Z gronemeier
	73	! Bugfix: Definition of topography grid levels if vertical grid stretching
	74	! starts below the maximum topography height.
	75	!
[1581]	76	! 1580 2015-04-10 13:43:49Z suehring
	77	! Bugfix: setting flags for 5th order scheme near buildings
	78	!
[1576]	79	! 1575 2015-03-27 09:56:27Z raasch
	80	! adjustments for psolver-queries
	81	!
[1558]	82	! 1557 2015-03-05 16:43:04Z suehring
	83	! Adjustment for monotoinic limiter
	84	!
[1419]	85	! 1418 2014-06-06 13:05:08Z fricke
	86	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	87	! condition and a negative value for dz_stretch_level the condition
	88	! was always true for the whole model domain
	89	!
[1410]	90	! 1409 2014-05-23 12:11:32Z suehring
	91	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	92	! j <= nysv
	93	!
[1354]	94	! 1353 2014-04-08 15:21:23Z heinze
	95	! REAL constants provided with KIND-attribute
	96	!
[1323]	97	! 1322 2014-03-20 16:38:49Z raasch
	98	! REAL constants defined as wp-kind
	99	!
[1321]	100	! 1320 2014-03-20 08:40:49Z raasch
[1320]	101	! ONLY-attribute added to USE-statements,
	102	! kind-parameters added to all INTEGER and REAL declaration statements,
	103	! kinds are defined in new module kinds,
	104	! revision history before 2012 removed,
	105	! comment fields (!:) to be used for variable explanations added to
	106	! all variable declaration statements
[1321]	107	!
[1222]	108	! 1221 2013-09-10 08:59:13Z raasch
	109	! wall_flags_00 introduced to hold bits 32-63,
	110	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	111	! loops optimized for openACC (pres + flow_statistics)
	112	!
[1093]	113	! 1092 2013-02-02 11:24:22Z raasch
	114	! unused variables removed
	115	!
[1070]	116	! 1069 2012-11-28 16:18:43Z maronga
[1779]	117	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the
	118	! ocean model in case of coupled runs
[1070]	119	!
[1037]	120	! 1036 2012-10-22 13:43:42Z raasch
	121	! code put under GPL (PALM 3.9)
	122	!
[1017]	123	! 1015 2012-09-27 09:23:24Z raasch
	124	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	125	! nzb_w_inner+1
	126	!
[997]	127	! 996 2012-09-07 10:41:47Z raasch
	128	! little reformatting
	129	!
[979]	130	! 978 2012-08-09 08:28:32Z fricke
	131	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	132	! Bugfix: Set wall_flags_0 for inflow boundary
	133	!
[928]	134	! 927 2012-06-06 19:15:04Z raasch
	135	! Wall flags are not set for multigrid method in case of masking method
	136	!
[865]	137	! 864 2012-03-27 15:10:33Z gryschka
[927]	138	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	139	! were not correctly defined for k=1.
[865]	140	!
[863]	141	! 861 2012-03-26 14:18:34Z suehring
[861]	142	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	143	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	144	! model domain.!
[861]	145	! Initialization of nzb_s_inner and nzb_w_inner.
	146	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	147	! while setting wall_flags_0
	148	!
[844]	149	! 843 2012-02-29 15:16:21Z gryschka
	150	! In case of ocean and dirichlet bc for u and v at the bottom
	151	! the first u-level ist defined at same height as the first w-level
	152	!
[819]	153	! 818 2012-02-08 16:11:23Z maronga
	154	! Bugfix: topo_height is only required if topography is used. It is thus now
	155	! allocated in the topography branch
	156	!
[810]	157	! 809 2012-01-30 13:32:58Z maronga
	158	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	159	!
[808]	160	! 807 2012-01-25 11:53:51Z maronga
	161	! New cpp directive "__check" implemented which is used by check_namelist_files
	162	!
[1]	163	! Revision 1.1 1997/08/11 06:17:45 raasch
	164	! Initial revision (Testversion)
	165	!
	166	!
	167	! Description:
	168	! ------------
[1682]	169	!> Creating grid depending constants
[1]	170	!------------------------------------------------------------------------------!
[1682]	171	SUBROUTINE init_grid
	172
[1]	173
[1320]	174	USE arrays_3d, &
	175	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	176	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	177
[1353]	178	USE control_parameters, &
[1910]	179	ONLY: bc_lr_cyc, bc_ns_cyc, building_height, building_length_x, &
[1320]	180	building_length_y, building_wall_left, building_wall_south, &
	181	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	182	canyon_width_x, canyon_width_y, constant_flux_layer, &
	183	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	184	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	185	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	186	masking_method, maximum_grid_level, message_string, &
[1762]	187	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	188	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
	189	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	190	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	191	wall_adjustment_factor
[1320]	192
	193	USE grid_variables, &
	194	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	195	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	196	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	197
	198	USE indices, &
	199	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	200	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
[1845]	201	nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, nzb_diff_u, &
	202	nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, nzb_u_inner, &
	203	nzb_u_outer, nzb_v_inner, nzb_v_outer, nzb_w_inner, &
	204	nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
[1320]	205	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	206	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	207	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	208	wall_flags_9
	209
	210	USE kinds
	211
[1]	212	USE pegrid
	213
	214	IMPLICIT NONE
	215
[1886]	216	INTEGER(iwp) :: bh !< temporary vertical index of building height
	217	INTEGER(iwp) :: blx !< grid point number of building size along x
	218	INTEGER(iwp) :: bly !< grid point number of building size along y
	219	INTEGER(iwp) :: bxl !< index for left building wall
	220	INTEGER(iwp) :: bxr !< index for right building wall
	221	INTEGER(iwp) :: byn !< index for north building wall
	222	INTEGER(iwp) :: bys !< index for south building wall
	223	INTEGER(iwp) :: ch !< temporary vertical index for canyon height
	224	INTEGER(iwp) :: cwx !< grid point number of canyon size along x
	225	INTEGER(iwp) :: cwy !< grid point number of canyon size along y
	226	INTEGER(iwp) :: cxl !< index for left canyon wall
	227	INTEGER(iwp) :: cxr !< index for right canyon wall
	228	INTEGER(iwp) :: cyn !< index for north canyon wall
	229	INTEGER(iwp) :: cys !< index for south canyon wall
[1931]	230	INTEGER(iwp) :: gls !< number of lateral ghost points at total model domain boundaries required for multigrid solver
[1886]	231	INTEGER(iwp) :: i !< index variable along x
	232	INTEGER(iwp) :: ii !< loop variable for reading topography file
	233	INTEGER(iwp) :: inc !< incremental parameter for coarsening grid level
	234	INTEGER(iwp) :: j !< index variable along y
	235	INTEGER(iwp) :: k !< index variable along z
	236	INTEGER(iwp) :: l !< loop variable
	237	INTEGER(iwp) :: nxl_l !< index of left PE boundary for multigrid level
	238	INTEGER(iwp) :: nxr_l !< index of right PE boundary for multigrid level
	239	INTEGER(iwp) :: nyn_l !< index of north PE boundary for multigrid level
	240	INTEGER(iwp) :: nys_l !< index of south PE boundary for multigrid level
	241	INTEGER(iwp) :: nzb_si !< dummy index for local nzb_s_inner
	242	INTEGER(iwp) :: nzt_l !< index of top PE boundary for multigrid level
	243	INTEGER(iwp) :: vi !< dummy for vertical influence
[1]	244
[1886]	245	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: &
[1931]	246	vertical_influence !< number of vertical grid points above obstacle where adjustment of near-wall mixing length is required
[1886]	247
[1931]	248	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !< index of north-left corner location to limit near-wall mixing length
[1886]	249	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !< north-right
	250	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !< south-left
	251	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !< south-right
[1931]	252	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !< distance to adjacent left-facing
[1886]	253	!< wall
	254	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !< north-facing
	255	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !< right-facing
	256	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !< right-facing
	257	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !< index for topography
	258	!< top at cell-center
[1931]	259	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !< dummy to calculate topography indices on u- and v-grid
[1]	260
[1886]	261	LOGICAL :: flag_set = .FALSE. !< steering variable for advection flags
[1]	262
[1886]	263	REAL(wp) :: dx_l !< grid spacing along x on different multigrid level
	264	REAL(wp) :: dy_l !< grid spacing along y on different multigrid level
	265	REAL(wp) :: dz_stretched !< stretched vertical grid spacing
[861]	266
[1931]	267	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !< input variable for topography height
[1]	268
[667]	269
[1]	270	!
[709]	271	!-- Calculation of horizontal array bounds including ghost layers
[667]	272	nxlg = nxl - nbgp
	273	nxrg = nxr + nbgp
	274	nysg = nys - nbgp
	275	nyng = nyn + nbgp
[709]	276
[667]	277	!
[1]	278	!-- Allocate grid arrays
[1353]	279	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	280	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	281
	282	!
	283	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	284	IF ( dz == -1.0_wp ) THEN
[254]	285	message_string = 'missing dz'
	286	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	287	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	288	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	289	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	290	ENDIF
[94]	291
[1]	292	!
[94]	293	!-- Define the vertical grid levels
	294	IF ( .NOT. ocean ) THEN
	295	!
	296	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	297	!-- The second u-level (k=1) corresponds to the top of the
[94]	298	!-- Prandtl-layer.
[667]	299
	300	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	301	zu(0) = 0.0_wp
	302	! zu(0) = - dz * 0.5_wp
[667]	303	ELSE
[1353]	304	zu(0) = - dz * 0.5_wp
[667]	305	ENDIF
[1353]	306	zu(1) = dz * 0.5_wp
[1]	307
[94]	308	dz_stretch_level_index = nzt+1
	309	dz_stretched = dz
	310	DO k = 2, nzt+1
	311	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	312	dz_stretched = dz_stretched * dz_stretch_factor
	313	dz_stretched = MIN( dz_stretched, dz_max )
	314	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	315	ENDIF
	316	zu(k) = zu(k-1) + dz_stretched
	317	ENDDO
[1]	318
	319	!
[94]	320	!-- Compute the w-levels. They are always staggered half-way between the
[843]	321	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	322	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	323	!-- The top w-level is extrapolated linearly.
[1353]	324	zw(0) = 0.0_wp
[94]	325	DO k = 1, nzt
[1353]	326	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	327	ENDDO
[1353]	328	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	329
[94]	330	ELSE
[1]	331	!
[843]	332	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	333	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	334	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	335	!-- w-level are defined at same height, but staggered from the second level.
	336	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	337	zu(nzt+1) = dz * 0.5_wp
	338	zu(nzt) = - dz * 0.5_wp
[94]	339
	340	dz_stretch_level_index = 0
	341	dz_stretched = dz
	342	DO k = nzt-1, 0, -1
[1418]	343	!
	344	!-- The default value of dz_stretch_level is positive, thus the first
	345	!-- condition is always true. Hence, the second condition is necessary.
	346	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	347	.AND. dz_stretched < dz_max ) THEN
[94]	348	dz_stretched = dz_stretched * dz_stretch_factor
	349	dz_stretched = MIN( dz_stretched, dz_max )
	350	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	351	ENDIF
	352	zu(k) = zu(k+1) - dz_stretched
	353	ENDDO
	354
	355	!
	356	!-- Compute the w-levels. They are always staggered half-way between the
[843]	357	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	358	!-- at the ground. In this case the first u- and w-level are defined at
	359	!-- same height. The top w-level (nzt+1) is not used but set for
	360	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	361	zw(nzt+1) = dz
[1353]	362	zw(nzt) = 0.0_wp
[94]	363	DO k = 0, nzt
[1353]	364	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	365	ENDDO
	366
[843]	367	!
	368	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	369	!-- at same height.
	370	IF ( ibc_uv_b == 0 ) THEN
	371	zu(0) = zw(0)
	372	ENDIF
	373
[94]	374	ENDIF
	375
	376	!
[1]	377	!-- Compute grid lengths.
	378	DO k = 1, nzt+1
	379	dzu(k) = zu(k) - zu(k-1)
[1353]	380	ddzu(k) = 1.0_wp / dzu(k)
[1]	381	dzw(k) = zw(k) - zw(k-1)
[1353]	382	ddzw(k) = 1.0_wp / dzw(k)
[1]	383	ENDDO
	384
	385	DO k = 1, nzt
[1353]	386	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	387	ENDDO
[667]	388
	389	!
[709]	390	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	391	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	392	!-- is only dz/2, but should be dz. Therefore, an additional array
	393	!-- containing with appropriate grid information is created for these
	394	!-- solvers.
[1575]	395	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	396	ALLOCATE( ddzu_pres(1:nzt+1) )
	397	ddzu_pres = ddzu
[864]	398	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	399	ENDIF
[1]	400
	401	!
	402	!-- In case of multigrid method, compute grid lengths and grid factors for the
	403	!-- grid levels
[1575]	404	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	405
	406	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	407	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	408	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	409	f1_mg(nzb+1:nzt,maximum_grid_level), &
	410	f2_mg(nzb+1:nzt,maximum_grid_level), &
	411	f3_mg(nzb+1:nzt,maximum_grid_level) )
	412
	413	dzu_mg(:,maximum_grid_level) = dzu
[667]	414	!
[864]	415	!-- Next line to ensure an equally spaced grid.
	416	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	417
[1]	418	dzw_mg(:,maximum_grid_level) = dzw
	419	nzt_l = nzt
	420	DO l = maximum_grid_level-1, 1, -1
[1353]	421	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	422	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	423	nzt_l = nzt_l / 2
	424	DO k = 2, nzt_l+1
	425	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	426	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	427	ENDDO
	428	ENDDO
	429
	430	nzt_l = nzt
	431	dx_l = dx
	432	dy_l = dy
	433	DO l = maximum_grid_level, 1, -1
[1353]	434	ddx2_mg(l) = 1.0_wp / dx_l**2
	435	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	436	DO k = nzb+1, nzt_l
[1353]	437	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	438	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	439	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	440	f2_mg(k,l) + f3_mg(k,l)
	441	ENDDO
	442	nzt_l = nzt_l / 2
[1353]	443	dx_l = dx_l * 2.0_wp
	444	dy_l = dy_l * 2.0_wp
[1]	445	ENDDO
	446
	447	ENDIF
	448
	449	!
	450	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	451	ddx = 1.0_wp / dx
	452	ddy = 1.0_wp / dy
[1]	453	dx2 = dx * dx
	454	dy2 = dy * dy
[1353]	455	ddx2 = 1.0_wp / dx2
	456	ddy2 = 1.0_wp / dy2
[1]	457
	458	!
	459	!-- Compute the grid-dependent mixing length.
	460	DO k = 1, nzt
[1322]	461	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	462	ENDDO
	463
	464	!
	465	!-- Allocate outer and inner index arrays for topography and set
[114]	466	!-- defaults.
	467	!-- nzb_local has to contain additional layers of ghost points for calculating
	468	!-- the flag arrays needed for the multigrid method
	469	gls = 2**( maximum_grid_level )
[861]	470	IF ( gls < nbgp ) gls = nbgp
[667]	471
[114]	472	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	473	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	474	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	475	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	476	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	477	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	478	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	479	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	480	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	481	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	482	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	483	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	484	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	485	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	486	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	487	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	488	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	489	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	490	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	491	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	492	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	493	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
[1221]	494	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	495	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	496	wall_e_x(nysg:nyng,nxlg:nxrg), &
	497	wall_e_y(nysg:nyng,nxlg:nxrg), &
	498	wall_u(nysg:nyng,nxlg:nxrg), &
	499	wall_v(nysg:nyng,nxlg:nxrg), &
	500	wall_w_x(nysg:nyng,nxlg:nxrg), &
	501	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	502
	503
[667]	504
	505	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	506
[818]	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
[1353]	513	rflags_s_inner = 1.0_wp
	514	rflags_invers = 1.0_wp
[1221]	515
[1]	516	!
[19]	517	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	518	!-- form (which does not use surface fluxes) is applied
[1691]	519	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	520	nzb_diff = nzb + 2
	521	ELSE
	522	nzb_diff = nzb + 1
	523	ENDIF
[19]	524	IF ( use_top_fluxes ) THEN
	525	nzt_diff = nzt - 1
	526	ELSE
	527	nzt_diff = nzt
	528	ENDIF
[1]	529
	530	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	531	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	532
[1353]	533	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	534	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	535	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	536	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	537
	538	!
	539	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	540	!-- for the moment,
	541	!-- multiplication with wall_adjustment_factor near the end of this routine
	542	l_wall(nzb,:,:) = l_grid(1)
	543	DO k = nzb+1, nzt
	544	l_wall(k,:,:) = l_grid(k)
	545	ENDDO
	546	l_wall(nzt+1,:,:) = l_grid(nzt)
	547
	548	ALLOCATE ( vertical_influence(nzb:nzt) )
	549	DO k = 1, nzt
	550	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	551	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	552	ENDDO
	553
	554	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	555	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	556	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	557	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	558	'threshold given by only local', &
	559	' &horizontal reduction of near_wall ', &
	560	'mixing length l_wall', &
	561	' &starting from height level k = ', k, '.'
	562	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	563	EXIT
	564	ENDIF
	565	ENDDO
	566	vertical_influence(0) = vertical_influence(1)
	567
[667]	568	DO i = nxlg, nxrg
	569	DO j = nysg, nyng
[1]	570	DO k = nzb_s_inner(j,i) + 1, &
	571	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	572	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	573	ENDDO
	574	ENDDO
	575	ENDDO
	576
	577	!
	578	!-- Set outer and inner index arrays for non-flat topography.
	579	!-- Here consistency checks concerning domain size and periodicity are
	580	!-- necessary.
	581	!-- Within this SELECT CASE structure only nzb_local is initialized
	582	!-- individually depending on the chosen topography type, all other index
	583	!-- arrays are initialized further below.
	584	SELECT CASE ( TRIM( topography ) )
	585
	586	CASE ( 'flat' )
	587	!
[555]	588	!-- nzb_local is required for the multigrid solver
	589	nzb_local = 0
[1]	590
	591	CASE ( 'single_building' )
	592	!
	593	!-- Single rectangular building, by default centered in the middle of the
	594	!-- total domain
	595	blx = NINT( building_length_x / dx )
	596	bly = NINT( building_length_y / dy )
[1675]	597	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	598	IF ( ABS( zw(bh ) - building_height ) == &
	599	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	600
[1322]	601	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	602	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	603	ENDIF
	604	bxl = NINT( building_wall_left / dx )
	605	bxr = bxl + blx
	606
[1322]	607	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	608	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	609	ENDIF
	610	bys = NINT( building_wall_south / dy )
	611	byn = bys + bly
	612
	613	!
	614	!-- Building size has to meet some requirements
	615	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	616	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	617	WRITE( message_string, * ) 'inconsistent building parameters:', &
	618	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	619	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	620	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	621	ENDIF
	622
	623	!
[217]	624	!-- Define the building.
[1]	625	nzb_local = 0
[134]	626	nzb_local(bys:byn,bxl:bxr) = bh
[1]	627
[240]	628	CASE ( 'single_street_canyon' )
	629	!
	630	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	631	!-- The canyon is centered in the other direction by default.
[1322]	632	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	633	!
	634	!-- Street canyon in y direction
	635	cwx = NINT( canyon_width_x / dx )
[1322]	636	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	637	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	638	ENDIF
	639	cxl = NINT( canyon_wall_left / dx )
	640	cxr = cxl + cwx
	641
[1322]	642	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	643	!
	644	!-- Street canyon in x direction
	645	cwy = NINT( canyon_width_y / dy )
[1322]	646	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	647	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	648	ENDIF
	649	cys = NINT( canyon_wall_south / dy )
	650	cyn = cys + cwy
	651
	652	ELSE
[254]	653
	654	message_string = 'no street canyon width given'
	655	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	656
[240]	657	ENDIF
	658
[1675]	659	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	660	IF ( ABS( zw(ch ) - canyon_height ) == &
	661	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	662
[240]	663	dp_level_ind_b = ch
	664	!
	665	!-- Street canyon size has to meet some requirements
[1322]	666	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	667	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	668	( ch < 3 ) ) THEN
[1353]	669	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	670	'&cxl=', cxl, 'cxr=', cxr, &
	671	'cwx=', cwx, &
[254]	672	'ch=', ch, 'nx=', nx, 'ny=', ny
	673	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	674	ENDIF
[1322]	675	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	676	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	677	( ch < 3 ) ) THEN
[1353]	678	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	679	'&cys=', cys, 'cyn=', cyn, &
	680	'cwy=', cwy, &
[254]	681	'ch=', ch, 'nx=', nx, 'ny=', ny
	682	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	683	ENDIF
	684	ENDIF
[1353]	685	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	686	canyon_width_y /= 9999999.9_wp ) THEN
	687	message_string = 'inconsistent canyon parameters:' // &
	688	'&street canyon can only be oriented' // &
[254]	689	'&either in x- or in y-direction'
	690	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	691	ENDIF
	692
	693	nzb_local = ch
[1322]	694	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	695	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	696	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	697	nzb_local(cys+1:cyn-1,:) = 0
	698	ENDIF
	699
[1]	700	CASE ( 'read_from_file' )
[759]	701
[818]	702	ALLOCATE ( topo_height(0:ny,0:nx) )
	703
[759]	704	DO ii = 0, io_blocks-1
	705	IF ( ii == io_group ) THEN
	706
[1]	707	!
[759]	708	!-- Arbitrary irregular topography data in PALM format (exactly
	709	!-- matching the grid size and total domain size)
[1779]	710	OPEN( 90, FILE='TOPOGRAPHY_DATA'//TRIM( coupling_char ), &
	711	STATUS='OLD', FORM='FORMATTED', ERR=10 )
[759]	712	DO j = ny, 0, -1
	713	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	714	ENDDO
	715
	716	GOTO 12
	717
[1779]	718	10 message_string = 'file TOPOGRAPHY'//TRIM( coupling_char )// &
	719	' does not exist'
[759]	720	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	721
[1779]	722	11 message_string = 'errors in file TOPOGRAPHY_DATA'// &
	723	TRIM( coupling_char )
[759]	724	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	725
	726	12 CLOSE( 90 )
	727
	728	ENDIF
[1804]	729	#if defined( __parallel )
[759]	730	CALL MPI_BARRIER( comm2d, ierr )
	731	#endif
[559]	732	ENDDO
[759]	733
[1]	734	!
	735	!-- Calculate the index height of the topography
	736	DO i = 0, nx
	737	DO j = 0, ny
[1675]	738	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	739	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	740	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	741	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	742	ENDDO
	743	ENDDO
[818]	744
	745	DEALLOCATE ( topo_height )
[1910]	746
[114]	747	!
[1910]	748	!-- Add cyclic or Neumann boundary conditions (additional layers are for
	749	!-- calculating flag arrays needed for the multigrid sover)
	750	IF ( bc_ns_cyc ) THEN
	751	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	752	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	753	ELSE
	754	DO j = -gls, -1
	755	nzb_local(j,0:nx) = nzb_local(0,0:nx)
	756	ENDDO
	757	DO j = ny+1, ny+gls
	758	nzb_local(j,0:nx) = nzb_local(ny,0:nx)
	759	ENDDO
	760	ENDIF
[667]	761
[1910]	762	IF ( bc_lr_cyc ) THEN
	763	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	764	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	765	ELSE
	766	DO i = -gls, -1
	767	nzb_local(:,i) = nzb_local(:,0)
	768	ENDDO
	769	DO i = nx+1, nx+gls
	770	nzb_local(:,i) = nzb_local(:,nx)
	771	ENDDO
	772	ENDIF
	773
[1]	774	CASE DEFAULT
	775	!
	776	!-- The DEFAULT case is reached either if the parameter topography
[217]	777	!-- contains a wrong character string or if the user has defined a special
[1]	778	!-- case in the user interface. There, the subroutine user_init_grid
	779	!-- checks which of these two conditions applies.
[114]	780	CALL user_init_grid( gls, nzb_local )
[1]	781
	782	END SELECT
	783	!
[861]	784	!-- Determine the maximum level of topography. Furthermore it is used for
	785	!-- steering the degradation of order of the applied advection scheme.
[978]	786	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	787	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	788	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	789	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	790	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	791	nest_domain ) &
	792	THEN
	793	nzb_max = nzt
[978]	794	ENDIF
	795
[861]	796	!
[1]	797	!-- Consistency checks and index array initialization are only required for
[217]	798	!-- non-flat topography, also the initialization of topography height arrays
[49]	799	!-- zu_s_inner and zw_w_inner
[1]	800	IF ( TRIM( topography ) /= 'flat' ) THEN
	801
	802	!
	803	!-- Consistency checks
	804	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	805	WRITE( message_string, * ) 'nzb_local values are outside the', &
	806	'model domain', &
	807	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	808	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	809	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	810	ENDIF
	811
[1910]	812	IF ( bc_lr_cyc ) THEN
[1353]	813	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	814	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	815	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	816	' boundary condition in x-direction'
	817	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	818	ENDIF
	819	ENDIF
[1910]	820	IF ( bc_ns_cyc ) THEN
[1353]	821	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	822	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	823	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	824	' boundary condition in y-direction'
	825	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	826	ENDIF
	827	ENDIF
	828
[217]	829	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	830	!
[217]	831	!-- The array nzb_local as defined using the 'cell_edge' convention
	832	!-- describes the actual total size of topography which is defined at the
	833	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	834	!-- on the topography walls in y-direction. However, PALM uses individual
	835	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	836	!-- Therefore, the extent of topography in nzb_local is now reduced by
	837	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	838	!-- to form the basis for nzb_s_inner.
	839	DO j = -gls, ny + gls
	840	DO i = -gls, nx
	841	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	842	ENDDO
[134]	843	ENDDO
[217]	844	!-- apply cyclic boundary conditions in x-direction
	845	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	846	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	847	DO i = -gls, nx + gls
	848	DO j = -gls, ny
	849	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	850	ENDDO
[134]	851	ENDDO
[217]	852	!-- apply cyclic boundary conditions in y-direction
	853	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	854	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	855	ENDIF
[134]	856
[1]	857	!
	858	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	859	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	860	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	861
	862	!
	863	!-- Initialize remaining index arrays:
	864	!-- first pre-initialize them with nzb_s_inner...
	865	nzb_u_inner = nzb_s_inner
	866	nzb_u_outer = nzb_s_inner
	867	nzb_v_inner = nzb_s_inner
	868	nzb_v_outer = nzb_s_inner
	869	nzb_w_outer = nzb_s_inner
	870	nzb_s_outer = nzb_s_inner
	871
	872	!
	873	!-- ...then extend pre-initialized arrays in their according directions
	874	!-- based on nzb_local using nzb_tmp as a temporary global index array
	875
	876	!
	877	!-- nzb_s_outer:
	878	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	879	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	880	DO j = -1, ny + 1
	881	DO i = 0, nx
[1353]	882	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	883	nzb_local(j,i+1) )
	884	ENDDO
	885	ENDDO
	886	DO i = nxl, nxr
	887	DO j = nys, nyn
[1353]	888	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	889	nzb_tmp(j+1,i) )
	890	ENDDO
	891	!
	892	!-- non-cyclic boundary conditions (overwritten by call of
	893	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	894	IF ( nys == 0 ) THEN
	895	j = -1
	896	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	897	ENDIF
[1743]	898	IF ( nyn == ny ) THEN
[1]	899	j = ny + 1
	900	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	901	ENDIF
	902	ENDDO
	903	!
	904	!-- nzb_w_outer:
	905	!-- identical to nzb_s_outer
	906	nzb_w_outer = nzb_s_outer
	907
	908	!
	909	!-- nzb_u_inner:
	910	!-- extend nzb_local rightwards only
[667]	911	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	912	DO j = -1, ny + 1
	913	DO i = 0, nx + 1
	914	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	915	ENDDO
	916	ENDDO
[667]	917	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	918
	919	!
	920	!-- nzb_u_outer:
	921	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	922	DO i = nxl, nxr
	923	DO j = nys, nyn
[1353]	924	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	925	nzb_tmp(j+1,i) )
	926	ENDDO
	927	!
	928	!-- non-cyclic boundary conditions (overwritten by call of
	929	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	930	IF ( nys == 0 ) THEN
	931	j = -1
	932	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	933	ENDIF
[1743]	934	IF ( nyn == ny ) THEN
[1]	935	j = ny + 1
	936	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	937	ENDIF
	938	ENDDO
	939
	940	!
	941	!-- nzb_v_inner:
	942	!-- extend nzb_local northwards only
[667]	943	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	944	DO i = -1, nx + 1
	945	DO j = 0, ny + 1
	946	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	947	ENDDO
	948	ENDDO
[1886]	949	nzb_v_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	950
	951	!
	952	!-- nzb_v_outer:
	953	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	954	DO j = nys, nyn
	955	DO i = nxl, nxr
[1353]	956	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	957	nzb_tmp(j,i+1) )
	958	ENDDO
	959	!
	960	!-- non-cyclic boundary conditions (overwritten by call of
	961	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	962	IF ( nxl == 0 ) THEN
	963	i = -1
	964	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	965	ENDIF
	966	IF ( nxr == nx ) THEN
	967	i = nx + 1
	968	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	969	ENDIF
	970	ENDDO
[1804]	971
[1]	972	!
	973	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	974	!-- boundary conditions, if applicable.
	975	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	976	!-- they do not require exchange and are not included here.
	977	CALL exchange_horiz_2d_int( nzb_u_inner )
	978	CALL exchange_horiz_2d_int( nzb_u_outer )
	979	CALL exchange_horiz_2d_int( nzb_v_inner )
	980	CALL exchange_horiz_2d_int( nzb_v_outer )
	981	CALL exchange_horiz_2d_int( nzb_w_outer )
	982	CALL exchange_horiz_2d_int( nzb_s_outer )
	983
[49]	984	!
	985	!-- Allocate and set the arrays containing the topography height
	986	IF ( myid == 0 ) THEN
	987
	988	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	989
	990	DO i = 0, nx + 1
	991	DO j = 0, ny + 1
	992	zu_s_inner(i,j) = zu(nzb_local(j,i))
	993	zw_w_inner(i,j) = zw(nzb_local(j,i))
	994	ENDDO
	995	ENDDO
	996
	997	ENDIF
[1221]	998	!
	999	!-- Set flag arrays to be used for masking of grid points
	1000	DO i = nxlg, nxrg
	1001	DO j = nysg, nyng
	1002	DO k = nzb, nzt+1
[1353]	1003	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	1004	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	1005	ENDDO
	1006	ENDDO
	1007	ENDDO
[1804]	1008
[1]	1009	ENDIF
	1010
	1011	!
	1012	!-- Set the individual index arrays which define the k index from which on
	1013	!-- the usual finite difference form (which does not use surface fluxes) is
	1014	!-- applied
[1691]	1015	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	1016	nzb_diff_u = nzb_u_inner + 2
	1017	nzb_diff_v = nzb_v_inner + 2
	1018	nzb_diff_s_inner = nzb_s_inner + 2
	1019	nzb_diff_s_outer = nzb_s_outer + 2
	1020	ELSE
	1021	nzb_diff_u = nzb_u_inner + 1
	1022	nzb_diff_v = nzb_v_inner + 1
	1023	nzb_diff_s_inner = nzb_s_inner + 1
	1024	nzb_diff_s_outer = nzb_s_outer + 1
	1025	ENDIF
	1026
	1027	!
	1028	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	1029	!-- for limitation of near-wall mixing length l_wall further below
	1030	corner_nl = 0
	1031	corner_nr = 0
	1032	corner_sl = 0
	1033	corner_sr = 0
	1034	wall_l = 0
	1035	wall_n = 0
	1036	wall_r = 0
	1037	wall_s = 0
	1038
	1039	DO i = nxl, nxr
	1040	DO j = nys, nyn
	1041	!
	1042	!-- u-component
	1043	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1044	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1045	fym(j,i) = 0.0_wp
	1046	fyp(j,i) = 1.0_wp
[1]	1047	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1048	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1049	fym(j,i) = 1.0_wp
	1050	fyp(j,i) = 0.0_wp
[1]	1051	ENDIF
	1052	!
	1053	!-- v-component
	1054	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1055	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1056	fxm(j,i) = 0.0_wp
	1057	fxp(j,i) = 1.0_wp
[1]	1058	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1059	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1060	fxm(j,i) = 1.0_wp
	1061	fxp(j,i) = 0.0_wp
[1]	1062	ENDIF
	1063	!
	1064	!-- w-component, also used for scalars, separate arrays for shear
	1065	!-- production of tke
	1066	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1067	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1068	wall_w_y(j,i) = 1.0_wp
	1069	fwym(j,i) = 0.0_wp
	1070	fwyp(j,i) = 1.0_wp
[1]	1071	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1072	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1073	wall_w_y(j,i) = 1.0_wp
	1074	fwym(j,i) = 1.0_wp
	1075	fwyp(j,i) = 0.0_wp
[1]	1076	ENDIF
	1077	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1078	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1079	wall_w_x(j,i) = 1.0_wp
	1080	fwxm(j,i) = 0.0_wp
	1081	fwxp(j,i) = 1.0_wp
[1]	1082	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1083	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1084	wall_w_x(j,i) = 1.0_wp
	1085	fwxm(j,i) = 1.0_wp
	1086	fwxp(j,i) = 0.0_wp
[1]	1087	ENDIF
	1088	!
	1089	!-- Wall and corner locations inside buildings for limitation of
	1090	!-- near-wall mixing length l_wall
	1091	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1092
	1093	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1094
	1095	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1096	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1097	nzb_s_inner(j,i-1) ) + 1
	1098	ENDIF
	1099
	1100	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1101	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1102	nzb_s_inner(j,i+1) ) + 1
	1103	ENDIF
	1104
	1105	ENDIF
	1106
	1107	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1108
	1109	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1110	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1111	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1112	nzb_s_inner(j,i-1) ) + 1
	1113	ENDIF
	1114
	1115	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1116	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1117	nzb_s_inner(j,i+1) ) + 1
	1118	ENDIF
	1119
	1120	ENDIF
	1121
	1122	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1123	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1124	ENDIF
	1125
	1126	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1127	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1128	ENDIF
	1129
	1130	ENDDO
	1131	ENDDO
	1132
	1133	!
[1931]	1134	!-- Calculate wall flag arrays for the multigrid method.
	1135	!-- Please note, wall flags are only applied in the not cache-optimized
	1136	!-- version.
	1137	IF ( psolver == 'multigrid_noopt' ) THEN
[114]	1138	!
	1139	!-- Gridpoint increment of the current level
	1140	inc = 1
	1141
	1142	DO l = maximum_grid_level, 1 , -1
	1143
	1144	nxl_l = nxl_mg(l)
	1145	nxr_l = nxr_mg(l)
	1146	nys_l = nys_mg(l)
	1147	nyn_l = nyn_mg(l)
	1148	nzt_l = nzt_mg(l)
	1149
	1150	!
	1151	!-- Assign the flag level to be calculated
	1152	SELECT CASE ( l )
	1153	CASE ( 1 )
	1154	flags => wall_flags_1
	1155	CASE ( 2 )
	1156	flags => wall_flags_2
	1157	CASE ( 3 )
	1158	flags => wall_flags_3
	1159	CASE ( 4 )
	1160	flags => wall_flags_4
	1161	CASE ( 5 )
	1162	flags => wall_flags_5
	1163	CASE ( 6 )
	1164	flags => wall_flags_6
	1165	CASE ( 7 )
	1166	flags => wall_flags_7
	1167	CASE ( 8 )
	1168	flags => wall_flags_8
	1169	CASE ( 9 )
	1170	flags => wall_flags_9
	1171	CASE ( 10 )
	1172	flags => wall_flags_10
	1173	END SELECT
	1174
	1175	!
	1176	!-- Depending on the grid level, set the respective bits in case of
	1177	!-- neighbouring walls
	1178	!-- Bit 0: wall to the bottom
	1179	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1180	!-- Bit 2: wall to the south
	1181	!-- Bit 3: wall to the north
	1182	!-- Bit 4: wall to the left
	1183	!-- Bit 5: wall to the right
[116]	1184	!-- Bit 6: inside building
[114]	1185
	1186	flags = 0
	1187
[927]	1188	!
	1189	!-- In case of masking method, flags are not set and multigrid method
	1190	!-- works like FFT-solver
[1931]	1191	IF ( .NOT. masking_method ) THEN
[927]	1192
	1193	DO i = nxl_l-1, nxr_l+1
	1194	DO j = nys_l-1, nyn_l+1
	1195	DO k = nzb, nzt_l+1
[114]	1196
	1197	!
[927]	1198	!-- Inside/outside building (inside building does not need
	1199	!-- further tests for walls)
	1200	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1201
[927]	1202	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1203
[927]	1204	ELSE
[114]	1205	!
[927]	1206	!-- Bottom wall
	1207	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1208	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1209	ENDIF
[114]	1210	!
[927]	1211	!-- South wall
	1212	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1213	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1214	ENDIF
[114]	1215	!
[927]	1216	!-- North wall
	1217	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1218	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1219	ENDIF
[114]	1220	!
[927]	1221	!-- Left wall
	1222	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1223	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1224	ENDIF
[114]	1225	!
[927]	1226	!-- Right wall
	1227	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1228	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1229	ENDIF
	1230
[114]	1231	ENDIF
	1232
[927]	1233	ENDDO
[114]	1234	ENDDO
	1235	ENDDO
	1236
[927]	1237	ENDIF
	1238
[114]	1239	!
	1240	!-- Test output of flag arrays
[145]	1241	! i = nxl_l
	1242	! WRITE (9,*) ' '
	1243	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1244	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1245	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1246	! DO k = nzt_l+1, nzb, -1
	1247	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1248	! ENDDO
[114]	1249
	1250	inc = inc * 2
	1251
	1252	ENDDO
	1253
	1254	ENDIF
[861]	1255	!
	1256	!-- Allocate flags needed for masking walls.
[1677]	1257	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1258	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1259	wall_flags_0 = 0
	1260	wall_flags_00 = 0
[114]	1261
[1886]	1262	IF ( scalar_advec == 'ws-scheme' .OR. &
[1557]	1263	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1264	!
[861]	1265	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1266	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1267	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1268	!-- grid points.
	1269	DO i = nxl, nxr
	1270	DO j = nys, nyn
	1271	DO k = nzb_s_inner(j,i)+1, nzt
	1272	!
	1273	!-- scalar - x-direction
	1274	!-- WS1 (0), WS3 (1), WS5 (2)
[1886]	1275	IF ( ( k <= nzb_s_inner(j,i+1) .OR. k <= nzb_s_inner(j,i+2) &
	1276	.OR. k <= nzb_s_inner(j,i-1) ) &
	1277	.OR. ( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
[1762]	1278	.AND. i == nxl ) .OR. &
	1279	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1280	.AND. i == nxr ) ) &
	1281	THEN
[861]	1282	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
[1886]	1283	ELSEIF ( ( k <= nzb_s_inner(j,i+3) .AND. k > nzb_s_inner(j,i+1)&
	1284	.AND. k > nzb_s_inner(j,i+2)&
	1285	.AND. k > nzb_s_inner(j,i-1)&
	1286	) .OR. &
	1287	( k <= nzb_s_inner(j,i-2) .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	) &
[1762]	1291	.OR. &
	1292	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1293	.AND. i == nxr-1 ) .OR. &
	1294	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1295	.AND. i == nxlu ) ) &
	1296	THEN
[861]	1297	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
[1886]	1298	ELSEIF ( k > nzb_s_inner(j,i+1) .AND. k > nzb_s_inner(j,i+2) &
	1299	.AND. k > nzb_s_inner(j,i+3) .AND. k > nzb_s_inner(j,i-1) &
	1300	.AND. k > nzb_s_inner(j,i-2) ) &
	1301	THEN
[861]	1302	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1303	ENDIF
	1304	!
	1305	!-- scalar - y-direction
	1306	!-- WS1 (3), WS3 (4), WS5 (5)
[1886]	1307	IF ( ( k <= nzb_s_inner(j+1,i) .OR. k <= nzb_s_inner(j+2,i) &
	1308	.OR. k <= nzb_s_inner(j-1,i) ) &
	1309	.OR. &
[1762]	1310	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1311	.AND. j == nys ) .OR. &
	1312	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1313	.AND. j == nyn ) ) &
	1314	THEN
[861]	1315	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
[1762]	1316	!
[861]	1317	!-- WS3
[1886]	1318	ELSEIF ( ( k <= nzb_s_inner(j+3,i) .AND. k > nzb_s_inner(j+1,i)&
	1319	.AND. k > nzb_s_inner(j+2,i)&
	1320	.AND. k > nzb_s_inner(j-1,i)&
	1321	) .OR. &
	1322	( k <= nzb_s_inner(j-2,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	) &
	1326	.OR. &
[1762]	1327	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1328	.AND. j == nysv ) .OR. &
	1329	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1330	.AND. j == nyn-1 ) ) &
	1331	THEN
[861]	1332	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
[1762]	1333	!
[861]	1334	!-- WS5
[1886]	1335	ELSEIF ( k > nzb_s_inner(j+1,i) .AND. k > nzb_s_inner(j+2,i) &
	1336	.AND. k > nzb_s_inner(j+3,i) .AND. k > nzb_s_inner(j-1,i) &
	1337	.AND. k > nzb_s_inner(j-2,i) ) &
	1338	THEN
[861]	1339	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1340	ENDIF
	1341	!
	1342	!-- scalar - z-direction
	1343	!-- WS1 (6), WS3 (7), WS5 (8)
	1344	flag_set = .FALSE.
	1345	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1346	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1347	flag_set = .TRUE.
	1348	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1349	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1350	flag_set = .TRUE.
	1351	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1352	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1353	ENDIF
[1886]	1354
[861]	1355	ENDDO
	1356	ENDDO
	1357	ENDDO
	1358	ENDIF
	1359
	1360	IF ( momentum_advec == 'ws-scheme' ) THEN
	1361	!
	1362	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1363	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1364	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1365	!-- grid points.
	1366	DO i = nxl, nxr
	1367	DO j = nys, nyn
[1580]	1368	DO k = nzb+1, nzt
[861]	1369	!
[1580]	1370	!-- At first, set flags to WS1.
	1371	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1372	!-- in order to handle the left/south flux.
	1373	!-- near vertical walls.
	1374	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1375	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1376	!
[861]	1377	!-- u component - x-direction
	1378	!-- WS1 (9), WS3 (10), WS5 (11)
[1886]	1379	IF ( k <= nzb_u_inner(j,i+1) .OR. &
[1762]	1380	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1381	.AND. i <= nxlu ) .OR. &
	1382	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1383	.AND. i == nxr ) ) &
	1384	THEN
[1580]	1385	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[1886]	1386	ELSEIF ( ( k <= nzb_u_inner(j,i+2) .AND. &
	1387	k > nzb_u_inner(j,i+1) ) .OR. &
	1388	k <= nzb_u_inner(j,i-1) &
	1389	.OR. &
[1762]	1390	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1391	.AND. i == nxr-1 ) .OR. &
	1392	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1393	.AND. i == nxlu+1) ) &
	1394	THEN
[861]	1395	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1396	!
	1397	!-- Clear flag for WS1
	1398	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[1886]	1399	ELSEIF ( k > nzb_u_inner(j,i+1) .AND. k > nzb_u_inner(j,i+2) &
	1400	.AND. k > nzb_u_inner(j,i-1) ) &
	1401	THEN
[861]	1402	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1403	!
	1404	!-- Clear flag for WS1
	1405	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1406	ENDIF
	1407	!
	1408	!-- u component - y-direction
	1409	!-- WS1 (12), WS3 (13), WS5 (14)
[1762]	1410	IF ( k <= nzb_u_inner(j+1,i) .OR. &
	1411	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1412	.AND. j == nys ) .OR. &
	1413	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1414	.AND. j == nyn ) ) &
	1415	THEN
	1416	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[1886]	1417	ELSEIF ( ( k <= nzb_u_inner(j+2,i) .AND. &
	1418	k > nzb_u_inner(j+1,i) ) .OR. &
	1419	k <= nzb_u_inner(j-1,i) &
	1420	.OR. &
[1762]	1421	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1422	.AND. j == nysv ) .OR. &
	1423	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1424	.AND. j == nyn-1 ) ) &
	1425	THEN
[861]	1426	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1427	!
	1428	!-- Clear flag for WS1
	1429	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[1886]	1430	ELSEIF ( k > nzb_u_inner(j+1,i) .AND. k > nzb_u_inner(j+2,i) &
	1431	.AND. k > nzb_u_inner(j-1,i) ) &
	1432	THEN
[861]	1433	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1434	!
	1435	!-- Clear flag for WS1
	1436	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1437	ENDIF
	1438	!
	1439	!-- u component - z-direction
	1440	!-- WS1 (15), WS3 (16), WS5 (17)
	1441	flag_set = .FALSE.
	1442	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1443	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1444	flag_set = .TRUE.
	1445	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1446	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1447	flag_set = .TRUE.
	1448	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1449	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1450	ENDIF
	1451
	1452	ENDDO
	1453	ENDDO
	1454	ENDDO
	1455
	1456	DO i = nxl, nxr
	1457	DO j = nys, nyn
[1580]	1458	DO k = nzb+1, nzt
[861]	1459	!
[1580]	1460	!-- At first, set flags to WS1.
	1461	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1462	!-- in order to handle the left/south flux.
	1463	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1464	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1465	!
[861]	1466	!-- v component - x-direction
	1467	!-- WS1 (18), WS3 (19), WS5 (20)
[1762]	1468	IF ( k <= nzb_v_inner(j,i+1) .OR. &
	1469	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1470	.AND. i == nxl ) .OR. &
	1471	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1472	.AND. i == nxr ) ) &
	1473	THEN
	1474	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1475	!
[861]	1476	!-- WS3
[1886]	1477	ELSEIF ( ( k <= nzb_v_inner(j,i+2) .AND. &
	1478	k > nzb_v_inner(j,i+1) ) .OR. &
	1479	k <= nzb_v_inner(j,i-1) &
[1762]	1480	.OR. &
	1481	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1482	.AND. i == nxr-1 ) .OR. &
	1483	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1484	.AND. i == nxlu ) ) &
	1485	THEN
[861]	1486	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1487	!
	1488	!-- Clear flag for WS1
	1489	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[1886]	1490	ELSEIF ( k > nzb_v_inner(j,i+1) .AND. k > nzb_v_inner(j,i+2) &
	1491	.AND. k > nzb_v_inner(j,i-1) ) &
	1492	THEN
[861]	1493	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1494	!
	1495	!-- Clear flag for WS1
	1496	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1497	ENDIF
	1498	!
	1499	!-- v component - y-direction
	1500	!-- WS1 (21), WS3 (22), WS5 (23)
[1762]	1501	IF ( k <= nzb_v_inner(j+1,i) .OR. &
	1502	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1503	.AND. j <= nysv ) .OR. &
	1504	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1505	.AND. j == nyn ) ) &
	1506	THEN
	1507	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[1886]	1508	ELSEIF ( ( k <= nzb_v_inner(j+2,i) .AND. &
	1509	k > nzb_v_inner(j+1,i) ) .OR. &
	1510	k <= nzb_v_inner(j-1,i) &
	1511	.OR. &
[1762]	1512	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1513	.AND. j == nysv+1) .OR. &
	1514	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1515	.AND. j == nyn-1 ) ) &
	1516	THEN
[861]	1517	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1518	!
	1519	!-- Clear flag for WS1
	1520	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[1886]	1521	ELSEIF ( k > nzb_v_inner(j+1,i) .AND. k > nzb_v_inner(j+2,i) &
	1522	.AND. k > nzb_v_inner(j-1,i) ) &
	1523	THEN
[861]	1524	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1525	!
	1526	!-- Clear flag for WS1
	1527	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1528	ENDIF
	1529	!
	1530	!-- v component - z-direction
	1531	!-- WS1 (24), WS3 (25), WS5 (26)
	1532	flag_set = .FALSE.
	1533	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1534	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1535	flag_set = .TRUE.
	1536	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1537	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1538	flag_set = .TRUE.
	1539	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1540	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1541	ENDIF
	1542
	1543	ENDDO
	1544	ENDDO
	1545	ENDDO
	1546	DO i = nxl, nxr
	1547	DO j = nys, nyn
[1580]	1548	DO k = nzb+1, nzt
[861]	1549	!
[1580]	1550	!-- At first, set flags to WS1.
	1551	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1552	!-- in order to handle the left/south flux.
	1553	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1554	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1555	!
[861]	1556	!-- w component - x-direction
	1557	!-- WS1 (27), WS3 (28), WS5 (29)
[1762]	1558	IF ( k <= nzb_w_inner(j,i+1) .OR. &
	1559	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1560	.AND. i == nxl ) .OR. &
	1561	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1562	.AND. i == nxr ) ) &
	1563	THEN
	1564	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[1886]	1565	ELSEIF ( ( k <= nzb_w_inner(j,i+2) .AND. &
	1566	k > nzb_w_inner(j,i+1) ) .OR. &
	1567	k <= nzb_w_inner(j,i-1) &
	1568	.OR. &
[1762]	1569	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1570	.AND. i == nxr-1 ) .OR. &
	1571	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1572	.AND. i == nxlu ) ) &
	1573	THEN
[861]	1574	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1575	!
	1576	!-- Clear flag for WS1
	1577	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[1886]	1578	ELSEIF ( k > nzb_w_inner(j,i+1) .AND. k > nzb_w_inner(j,i+2) &
	1579	.AND. k > nzb_w_inner(j,i-1) ) &
	1580	THEN
[861]	1581	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1582	!
	1583	!-- Clear flag for WS1
	1584	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1585	ENDIF
	1586	!
	1587	!-- w component - y-direction
	1588	!-- WS1 (30), WS3 (31), WS5 (32)
[1762]	1589	IF ( k <= nzb_w_inner(j+1,i) .OR. &
	1590	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1591	.AND. j == nys ) .OR. &
	1592	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1593	.AND. j == nyn ) ) &
	1594	THEN
	1595	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[1886]	1596	ELSEIF ( ( k <= nzb_w_inner(j+2,i) .AND. &
	1597	k > nzb_w_inner(j+1,i) ) .OR. &
	1598	k <= nzb_w_inner(j-1,i) &
	1599	.OR. &
[1762]	1600	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1601	.AND. j == nysv ) .OR. &
	1602	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1603	.AND. j == nyn-1 ) ) &
	1604	THEN
[861]	1605	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1606	!
	1607	!-- Clear flag for WS1
	1608	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[1886]	1609	ELSEIF ( k > nzb_w_inner(j+1,i) .AND. k > nzb_w_inner(j+2,i) &
	1610	.AND. k > nzb_w_inner(j-1,i) ) &
	1611	THEN
[1221]	1612	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1613	!
	1614	!-- Clear flag for WS1
	1615	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1616	ENDIF
	1617	!
	1618	!-- w component - z-direction
[1679]	1619	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1620	flag_set = .FALSE.
	1621	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1622	.OR. k == nzt ) THEN
	1623	!
	1624	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1625	!-- set, although this is not a prognostic level. However,
	1626	!-- contrary to the advection of u,v and s this is necessary
	1627	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1628	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1629	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1630	flag_set = .TRUE.
	1631	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1632	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1633	flag_set = .TRUE.
	1634	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1635	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1636	ENDIF
	1637
	1638	ENDDO
	1639	ENDDO
	1640	ENDDO
	1641
	1642	ENDIF
	1643
	1644	!
[1677]	1645	!-- Exchange 3D integer wall_flags.
	1646	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1647	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1648	!
	1649	!-- Exchange ghost points for advection flags
	1650	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1651	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1652	!
	1653	!-- Set boundary flags at inflow and outflow boundary in case of
	1654	!-- non-cyclic boundary conditions.
[1762]	1655	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1677]	1656	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1657	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1658	ENDIF
	1659
[1762]	1660	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
[1677]	1661	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1662	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1663	ENDIF
	1664
[1762]	1665	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
[1677]	1666	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1667	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1668	ENDIF
	1669
[1762]	1670	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1677]	1671	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1672	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1673	ENDIF
	1674
	1675	ENDIF
	1676
	1677	!
[1]	1678	!-- In case of topography: limit near-wall mixing length l_wall further:
	1679	!-- Go through all points of the subdomain one by one and look for the closest
	1680	!-- surface
	1681	IF ( TRIM(topography) /= 'flat' ) THEN
	1682	DO i = nxl, nxr
	1683	DO j = nys, nyn
	1684
	1685	nzb_si = nzb_s_inner(j,i)
	1686	vi = vertical_influence(nzb_si)
	1687
	1688	IF ( wall_n(j,i) > 0 ) THEN
	1689	!
	1690	!-- North wall (y distance)
	1691	DO k = wall_n(j,i), nzb_si
[1353]	1692	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1693	ENDDO
	1694	!
	1695	!-- Above North wall (yz distance)
	1696	DO k = nzb_si + 1, nzb_si + vi
[1353]	1697	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1698	SQRT( 0.25_wp * dy**2 + &
[1]	1699	( zu(k) - zw(nzb_si) )**2 ) )
	1700	ENDDO
	1701	!
	1702	!-- Northleft corner (xy distance)
	1703	IF ( corner_nl(j,i) > 0 ) THEN
	1704	DO k = corner_nl(j,i), nzb_si
	1705	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1706	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1707	ENDDO
	1708	!
	1709	!-- Above Northleft corner (xyz distance)
	1710	DO k = nzb_si + 1, nzb_si + vi
[1353]	1711	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1712	SQRT( 0.25_wp * (dx2 + dy2) + &
	1713	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1714	ENDDO
	1715	ENDIF
	1716	!
	1717	!-- Northright corner (xy distance)
	1718	IF ( corner_nr(j,i) > 0 ) THEN
	1719	DO k = corner_nr(j,i), nzb_si
[1353]	1720	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1721	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1722	ENDDO
	1723	!
	1724	!-- Above northright corner (xyz distance)
	1725	DO k = nzb_si + 1, nzb_si + vi
[1353]	1726	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1727	SQRT( 0.25_wp * (dx2 + dy2) + &
	1728	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1729	ENDDO
	1730	ENDIF
	1731	ENDIF
	1732
	1733	IF ( wall_s(j,i) > 0 ) THEN
	1734	!
	1735	!-- South wall (y distance)
	1736	DO k = wall_s(j,i), nzb_si
[1353]	1737	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1738	ENDDO
	1739	!
	1740	!-- Above south wall (yz distance)
[1353]	1741	DO k = nzb_si + 1, nzb_si + vi
	1742	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1743	SQRT( 0.25_wp * dy**2 + &
[1]	1744	( zu(k) - zw(nzb_si) )**2 ) )
	1745	ENDDO
	1746	!
	1747	!-- Southleft corner (xy distance)
	1748	IF ( corner_sl(j,i) > 0 ) THEN
	1749	DO k = corner_sl(j,i), nzb_si
[1353]	1750	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1751	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1752	ENDDO
	1753	!
	1754	!-- Above southleft corner (xyz distance)
	1755	DO k = nzb_si + 1, nzb_si + vi
[1353]	1756	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1757	SQRT( 0.25_wp * (dx2 + dy2) + &
	1758	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1759	ENDDO
	1760	ENDIF
	1761	!
	1762	!-- Southright corner (xy distance)
	1763	IF ( corner_sr(j,i) > 0 ) THEN
	1764	DO k = corner_sr(j,i), nzb_si
[1353]	1765	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1766	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1767	ENDDO
	1768	!
	1769	!-- Above southright corner (xyz distance)
	1770	DO k = nzb_si + 1, nzb_si + vi
[1353]	1771	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1772	SQRT( 0.25_wp * (dx2 + dy2) + &
	1773	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1774	ENDDO
	1775	ENDIF
	1776
	1777	ENDIF
	1778
	1779	IF ( wall_l(j,i) > 0 ) THEN
	1780	!
	1781	!-- Left wall (x distance)
	1782	DO k = wall_l(j,i), nzb_si
[1353]	1783	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1784	ENDDO
	1785	!
	1786	!-- Above left wall (xz distance)
	1787	DO k = nzb_si + 1, nzb_si + vi
[1353]	1788	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1789	SQRT( 0.25_wp * dx**2 + &
	1790	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1791	ENDDO
	1792	ENDIF
	1793
	1794	IF ( wall_r(j,i) > 0 ) THEN
	1795	!
	1796	!-- Right wall (x distance)
	1797	DO k = wall_r(j,i), nzb_si
[1353]	1798	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1799	ENDDO
	1800	!
	1801	!-- Above right wall (xz distance)
	1802	DO k = nzb_si + 1, nzb_si + vi
[1353]	1803	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1804	SQRT( 0.25_wp * dx**2 + &
[1]	1805	( zu(k) - zw(nzb_si) )**2 ) )
	1806	ENDDO
	1807
	1808	ENDIF
	1809
	1810	ENDDO
	1811	ENDDO
	1812
	1813	ENDIF
	1814
	1815	!
	1816	!-- Multiplication with wall_adjustment_factor
	1817	l_wall = wall_adjustment_factor * l_wall
	1818
	1819	!
[709]	1820	!-- Set lateral boundary conditions for l_wall
[667]	1821	CALL exchange_horiz( l_wall, nbgp )
	1822
[1]	1823	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1824	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1825
	1826
	1827	END SUBROUTINE init_grid

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