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source: palm/trunk/SOURCE/init_grid.f90 @ 1493

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

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