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source: palm/trunk/SOURCE/init_grid.f90 @ 1339

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

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