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source: palm/trunk/SOURCE/init_grid.f90 @ 1558

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

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