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source: palm/trunk/SOURCE/init_grid.f90 @ 987

Last change on this file since 987 was 979, checked in by fricke, 12 years ago
last commit documented
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1	SUBROUTINE init_grid
2
3	!------------------------------------------------------------------------------!
4	! Current revisions:
5	! -----------------
6	!
7	!
8	! Former revisions:
9	! -----------------
10	! $Id: init_grid.f90 979 2012-08-09 08:50:11Z maronga $
11	!
12	! 978 2012-08-09 08:28:32Z fricke
13	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
14	! Bugfix: Set wall_flags_0 for inflow boundary
15	!
16	! 927 2012-06-06 19:15:04Z raasch
17	! Wall flags are not set for multigrid method in case of masking method
18	!
19	! 864 2012-03-27 15:10:33Z gryschka
20	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
21	! were not correctly defined for k=1.
22	!
23	! 861 2012-03-26 14:18:34Z suehring
24	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
25	! inflow and outflow boundaries as well as near the bottom and the top of the
26	! model domain.!
27	! Initialization of nzb_s_inner and nzb_w_inner.
28	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
29	! while setting wall_flags_0
30	!
31	! 843 2012-02-29 15:16:21Z gryschka
32	! In case of ocean and dirichlet bc for u and v at the bottom
33	! the first u-level ist defined at same height as the first w-level
34	!
35	! 818 2012-02-08 16:11:23Z maronga
36	! Bugfix: topo_height is only required if topography is used. It is thus now
37	! allocated in the topography branch
38	!
39	! 809 2012-01-30 13:32:58Z maronga
40	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
41	!
42	! 807 2012-01-25 11:53:51Z maronga
43	! New cpp directive "__check" implemented which is used by check_namelist_files
44	!
45	! 759 2011-09-15 13:58:31Z raasch
46	! Splitting of parallel I/O in blocks of PEs
47	!
48	! 722 2011-04-11 06:21:09Z raasch
49	! Bugfix: bc_lr/ns_cyc replaced by bc_lr/ns, because variables are not yet set
50	! here
51	!
52	! 709 2011-03-30 09:31:40Z raasch
53	! formatting adjustments
54	!
55	! 707 2011-03-29 11:39:40Z raasch
56	! bc_lr/ns replaced by bc_lr/ns_cyc
57	!
58	! 667 2010-12-23 12:06:00Z suehring/gryschka
59	! Definition of new array bounds nxlg, nxrg, nysg, nyng on each PE.
60	! Furthermore the allocation of arrays and steering of loops is done with these
61	! parameters. Call of exchange_horiz are modified.
62	! In case of dirichlet bounday condition at the bottom zu(0)=0.0
63	! dzu_mg has to be set explicitly for a equally spaced grid near bottom.
64	! ddzu_pres added to use a equally spaced grid near bottom.
65	!
66	! 555 2010-09-07 07:32:53Z raasch
67	! Bugfix: default setting of nzb_local for flat topography
68	!
69	! 274 2009-03-26 15:11:21Z heinze
70	! Output of messages replaced by message handling routine.
71	! new topography case 'single_street_canyon'
72	!
73	! 217 2008-12-09 18:00:48Z letzel
74	! +topography_grid_convention
75	!
76	! 134 2007-11-21 07:28:38Z letzel
77	! Redefine initial nzb_local as the actual total size of topography (later the
78	! extent of topography in nzb_local is reduced by 1dx at the E topography walls
79	! and by 1dy at the N topography walls to form the basis for nzb_s_inner);
80	! for consistency redefine 'single_building' case.
81	! Calculation of wall flag arrays
82	!
83	! 94 2007-06-01 15:25:22Z raasch
84	! Grid definition for ocean version
85	!
86	! 75 2007-03-22 09:54:05Z raasch
87	! storage of topography height arrays zu_s_inner and zw_s_inner,
88	! 2nd+3rd argument removed from exchange horiz
89	!
90	! 19 2007-02-23 04:53:48Z raasch
91	! Setting of nzt_diff
92	!
93	! RCS Log replace by Id keyword, revision history cleaned up
94	!
95	! Revision 1.17 2006/08/22 14:00:05 raasch
96	! +dz_max to limit vertical stretching,
97	! bugfix in index array initialization for line- or point-like topography
98	! structures
99	!
100	! Revision 1.1 1997/08/11 06:17:45 raasch
101	! Initial revision (Testversion)
102	!
103	!
104	! Description:
105	! ------------
106	! Creating grid depending constants
107	!------------------------------------------------------------------------------!
108
109	USE arrays_3d
110	USE control_parameters
111	USE grid_variables
112	USE indices
113	USE pegrid
114
115	IMPLICIT NONE
116
117	INTEGER :: bh, blx, bly, bxl, bxr, byn, bys, ch, cwx, cwy, cxl, cxr, cyn, &
118	cys, gls, i, ii, inc, i_center, j, j_center, k, l, nxl_l, &
119	nxr_l, nyn_l, nys_l, nzb_si, nzt_l, vi
120
121	INTEGER, DIMENSION(:), ALLOCATABLE :: vertical_influence
122
123	INTEGER, DIMENSION(:,:), ALLOCATABLE :: corner_nl, corner_nr, corner_sl, &
124	corner_sr, wall_l, wall_n, wall_r,&
125	wall_s, nzb_local, nzb_tmp
126
127	LOGICAL :: flag_set = .FALSE.
128
129	REAL :: dx_l, dy_l, dz_stretched
130
131	REAL, DIMENSION(:,:), ALLOCATABLE :: topo_height
132
133	REAL, DIMENSION(:,:,:), ALLOCATABLE :: distance
134
135	!
136	!-- Calculation of horizontal array bounds including ghost layers
137	nxlg = nxl - nbgp
138	nxrg = nxr + nbgp
139	nysg = nys - nbgp
140	nyng = nyn + nbgp
141
142	!
143	!-- Allocate grid arrays
144	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
145	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
146
147	!
148	!-- Compute height of u-levels from constant grid length and dz stretch factors
149	IF ( dz == -1.0 ) THEN
150	message_string = 'missing dz'
151	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
152	ELSEIF ( dz <= 0.0 ) THEN
153	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
154	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
155	ENDIF
156
157	!
158	!-- Define the vertical grid levels
159	IF ( .NOT. ocean ) THEN
160	!
161	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
162	!-- The second u-level (k=1) corresponds to the top of the
163	!-- Prandtl-layer.
164
165	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
166	zu(0) = 0.0
167	! zu(0) = - dz * 0.5
168	ELSE
169	zu(0) = - dz * 0.5
170	ENDIF
171	zu(1) = dz * 0.5
172
173	dz_stretch_level_index = nzt+1
174	dz_stretched = dz
175	DO k = 2, nzt+1
176	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
177	dz_stretched = dz_stretched * dz_stretch_factor
178	dz_stretched = MIN( dz_stretched, dz_max )
179	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
180	ENDIF
181	zu(k) = zu(k-1) + dz_stretched
182	ENDDO
183
184	!
185	!-- Compute the w-levels. They are always staggered half-way between the
186	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
187	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
188	!-- The top w-level is extrapolated linearly.
189	zw(0) = 0.0
190	DO k = 1, nzt
191	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
192	ENDDO
193	zw(nzt+1) = zw(nzt) + 2.0 * ( zu(nzt+1) - zw(nzt) )
194
195	ELSE
196	!
197	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
198	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
199	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
200	!-- w-level are defined at same height, but staggered from the second level.
201	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
202	zu(nzt+1) = dz * 0.5
203	zu(nzt) = - dz * 0.5
204
205	dz_stretch_level_index = 0
206	dz_stretched = dz
207	DO k = nzt-1, 0, -1
208	IF ( dz_stretch_level <= ABS( zu(k+1) ) .AND. &
209	dz_stretched < dz_max ) THEN
210	dz_stretched = dz_stretched * dz_stretch_factor
211	dz_stretched = MIN( dz_stretched, dz_max )
212	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
213	ENDIF
214	zu(k) = zu(k+1) - dz_stretched
215	ENDDO
216
217	!
218	!-- Compute the w-levels. They are always staggered half-way between the
219	!-- corresponding u-levels, except in case of dirichlet bc for u and v
220	!-- at the ground. In this case the first u- and w-level are defined at
221	!-- same height. The top w-level (nzt+1) is not used but set for
222	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
223	zw(nzt+1) = dz
224	zw(nzt) = 0.0
225	DO k = 0, nzt
226	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
227	ENDDO
228
229	!
230	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
231	!-- at same height.
232	IF ( ibc_uv_b == 0 ) THEN
233	zu(0) = zw(0)
234	ENDIF
235
236	ENDIF
237
238	!
239	!-- Compute grid lengths.
240	DO k = 1, nzt+1
241	dzu(k) = zu(k) - zu(k-1)
242	ddzu(k) = 1.0 / dzu(k)
243	dzw(k) = zw(k) - zw(k-1)
244	ddzw(k) = 1.0 / dzw(k)
245	ENDDO
246
247	DO k = 1, nzt
248	dd2zu(k) = 1.0 / ( dzu(k) + dzu(k+1) )
249	ENDDO
250
251	!
252	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
253	!-- everywhere. For the actual grid, the grid spacing at the lowest level
254	!-- is only dz/2, but should be dz. Therefore, an additional array
255	!-- containing with appropriate grid information is created for these
256	!-- solvers.
257	IF ( psolver /= 'multigrid' ) THEN
258	ALLOCATE( ddzu_pres(1:nzt+1) )
259	ddzu_pres = ddzu
260	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
261	ENDIF
262
263	!
264	!-- In case of multigrid method, compute grid lengths and grid factors for the
265	!-- grid levels
266	IF ( psolver == 'multigrid' ) THEN
267
268	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
269	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
270	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
271	f1_mg(nzb+1:nzt,maximum_grid_level), &
272	f2_mg(nzb+1:nzt,maximum_grid_level), &
273	f3_mg(nzb+1:nzt,maximum_grid_level) )
274
275	dzu_mg(:,maximum_grid_level) = dzu
276	!
277	!-- Next line to ensure an equally spaced grid.
278	dzu_mg(1,maximum_grid_level) = dzu(2)
279
280	dzw_mg(:,maximum_grid_level) = dzw
281	nzt_l = nzt
282	DO l = maximum_grid_level-1, 1, -1
283	dzu_mg(nzb+1,l) = 2.0 * dzu_mg(nzb+1,l+1)
284	dzw_mg(nzb+1,l) = 2.0 * dzw_mg(nzb+1,l+1)
285	nzt_l = nzt_l / 2
286	DO k = 2, nzt_l+1
287	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
288	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
289	ENDDO
290	ENDDO
291
292	nzt_l = nzt
293	dx_l = dx
294	dy_l = dy
295	DO l = maximum_grid_level, 1, -1
296	ddx2_mg(l) = 1.0 / dx_l**2
297	ddy2_mg(l) = 1.0 / dy_l**2
298	DO k = nzb+1, nzt_l
299	f2_mg(k,l) = 1.0 / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
300	f3_mg(k,l) = 1.0 / ( dzu_mg(k,l) * dzw_mg(k,l) )
301	f1_mg(k,l) = 2.0 * ( ddx2_mg(l) + ddy2_mg(l) ) + &
302	f2_mg(k,l) + f3_mg(k,l)
303	ENDDO
304	nzt_l = nzt_l / 2
305	dx_l = dx_l * 2.0
306	dy_l = dy_l * 2.0
307	ENDDO
308
309	ENDIF
310
311	!
312	!-- Compute the reciprocal values of the horizontal grid lengths.
313	ddx = 1.0 / dx
314	ddy = 1.0 / dy
315	dx2 = dx * dx
316	dy2 = dy * dy
317	ddx2 = 1.0 / dx2
318	ddy2 = 1.0 / dy2
319
320	!
321	!-- Compute the grid-dependent mixing length.
322	DO k = 1, nzt
323	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333
324	ENDDO
325
326	!
327	!-- Allocate outer and inner index arrays for topography and set
328	!-- defaults.
329	!-- nzb_local has to contain additional layers of ghost points for calculating
330	!-- the flag arrays needed for the multigrid method
331	gls = 2**( maximum_grid_level )
332	IF ( gls < nbgp ) gls = nbgp
333
334	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
335	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
336	nzb_local(-gls:ny+gls,-gls:nx+gls), &
337	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
338	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
339	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
340	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
341	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
342	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
343	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
344	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
345	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
346	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
347	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
348	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
349	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
350	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
351	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
352	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
353	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
354	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
355	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
356	nzb_2d(nysg:nyng,nxlg:nxrg), &
357	wall_e_x(nysg:nyng,nxlg:nxrg), &
358	wall_e_y(nysg:nyng,nxlg:nxrg), &
359	wall_u(nysg:nyng,nxlg:nxrg), &
360	wall_v(nysg:nyng,nxlg:nxrg), &
361	wall_w_x(nysg:nyng,nxlg:nxrg), &
362	wall_w_y(nysg:nyng,nxlg:nxrg) )
363
364
365
366	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
367
368
369	nzb_s_inner = nzb; nzb_s_outer = nzb
370	nzb_u_inner = nzb; nzb_u_outer = nzb
371	nzb_v_inner = nzb; nzb_v_outer = nzb
372	nzb_w_inner = nzb; nzb_w_outer = nzb
373
374	!
375	!-- Define vertical gridpoint from (or to) which on the usual finite difference
376	!-- form (which does not use surface fluxes) is applied
377	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
378	nzb_diff = nzb + 2
379	ELSE
380	nzb_diff = nzb + 1
381	ENDIF
382	IF ( use_top_fluxes ) THEN
383	nzt_diff = nzt - 1
384	ELSE
385	nzt_diff = nzt
386	ENDIF
387
388	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
389	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
390
391	wall_e_x = 0.0; wall_e_y = 0.0; wall_u = 0.0; wall_v = 0.0
392	wall_w_x = 0.0; wall_w_y = 0.0
393	fwxp = 1.0; fwxm = 1.0; fwyp = 1.0; fwym = 1.0
394	fxp = 1.0; fxm = 1.0; fyp = 1.0; fym = 1.0
395
396	!
397	!-- Initialize near-wall mixing length l_wall only in the vertical direction
398	!-- for the moment,
399	!-- multiplication with wall_adjustment_factor near the end of this routine
400	l_wall(nzb,:,:) = l_grid(1)
401	DO k = nzb+1, nzt
402	l_wall(k,:,:) = l_grid(k)
403	ENDDO
404	l_wall(nzt+1,:,:) = l_grid(nzt)
405
406	ALLOCATE ( vertical_influence(nzb:nzt) )
407	DO k = 1, nzt
408	vertical_influence(k) = MIN ( INT( l_grid(k) / &
409	( wall_adjustment_factor * dzw(k) ) + 0.5 ), nzt - k )
410	ENDDO
411
412	DO k = 1, MAXVAL( nzb_s_inner )
413	IF ( l_grid(k) > 1.5 * dx * wall_adjustment_factor .OR. &
414	l_grid(k) > 1.5 * dy * wall_adjustment_factor ) THEN
415	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
416	'threshold given by only local', &
417	' &horizontal reduction of near_wall ', &
418	'mixing length l_wall', &
419	' &starting from height level k = ', k, '.'
420	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
421	EXIT
422	ENDIF
423	ENDDO
424	vertical_influence(0) = vertical_influence(1)
425
426	DO i = nxlg, nxrg
427	DO j = nysg, nyng
428	DO k = nzb_s_inner(j,i) + 1, &
429	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
430	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
431	ENDDO
432	ENDDO
433	ENDDO
434
435	!
436	!-- Set outer and inner index arrays for non-flat topography.
437	!-- Here consistency checks concerning domain size and periodicity are
438	!-- necessary.
439	!-- Within this SELECT CASE structure only nzb_local is initialized
440	!-- individually depending on the chosen topography type, all other index
441	!-- arrays are initialized further below.
442	SELECT CASE ( TRIM( topography ) )
443
444	CASE ( 'flat' )
445	!
446	!-- nzb_local is required for the multigrid solver
447	nzb_local = 0
448
449	CASE ( 'single_building' )
450	!
451	!-- Single rectangular building, by default centered in the middle of the
452	!-- total domain
453	blx = NINT( building_length_x / dx )
454	bly = NINT( building_length_y / dy )
455	bh = NINT( building_height / dz )
456
457	IF ( building_wall_left == 9999999.9 ) THEN
458	building_wall_left = ( nx + 1 - blx ) / 2 * dx
459	ENDIF
460	bxl = NINT( building_wall_left / dx )
461	bxr = bxl + blx
462
463	IF ( building_wall_south == 9999999.9 ) THEN
464	building_wall_south = ( ny + 1 - bly ) / 2 * dy
465	ENDIF
466	bys = NINT( building_wall_south / dy )
467	byn = bys + bly
468
469	!
470	!-- Building size has to meet some requirements
471	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
472	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
473	WRITE( message_string, * ) 'inconsistent building parameters:', &
474	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
475	'byn=', byn, 'nx=', nx, 'ny=', ny
476	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
477	ENDIF
478
479	!
480	!-- Define the building.
481	nzb_local = 0
482	nzb_local(bys:byn,bxl:bxr) = bh
483
484	CASE ( 'single_street_canyon' )
485	!
486	!-- Single quasi-2D street canyon of infinite length in x or y direction.
487	!-- The canyon is centered in the other direction by default.
488	IF ( canyon_width_x /= 9999999.9 ) THEN
489	!
490	!-- Street canyon in y direction
491	cwx = NINT( canyon_width_x / dx )
492	IF ( canyon_wall_left == 9999999.9 ) THEN
493	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
494	ENDIF
495	cxl = NINT( canyon_wall_left / dx )
496	cxr = cxl + cwx
497
498	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
499	!
500	!-- Street canyon in x direction
501	cwy = NINT( canyon_width_y / dy )
502	IF ( canyon_wall_south == 9999999.9 ) THEN
503	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
504	ENDIF
505	cys = NINT( canyon_wall_south / dy )
506	cyn = cys + cwy
507
508	ELSE
509
510	message_string = 'no street canyon width given'
511	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
512
513	ENDIF
514
515	ch = NINT( canyon_height / dz )
516	dp_level_ind_b = ch
517	!
518	!-- Street canyon size has to meet some requirements
519	IF ( canyon_width_x /= 9999999.9 ) THEN
520	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
521	( ch < 3 ) ) THEN
522	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
523	'&cxl=', cxl, 'cxr=', cxr, &
524	'cwx=', cwx, &
525	'ch=', ch, 'nx=', nx, 'ny=', ny
526	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
527	ENDIF
528	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
529	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
530	( ch < 3 ) ) THEN
531	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
532	'&cys=', cys, 'cyn=', cyn, &
533	'cwy=', cwy, &
534	'ch=', ch, 'nx=', nx, 'ny=', ny
535	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
536	ENDIF
537	ENDIF
538	IF ( canyon_width_x /= 9999999.9 .AND. canyon_width_y /= 9999999.9 ) &
539	THEN
540	message_string = 'inconsistent canyon parameters:' // &
541	'&street canyon can only be oriented' // &
542	'&either in x- or in y-direction'
543	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
544	ENDIF
545
546	nzb_local = ch
547	IF ( canyon_width_x /= 9999999.9 ) THEN
548	nzb_local(:,cxl+1:cxr-1) = 0
549	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
550	nzb_local(cys+1:cyn-1,:) = 0
551	ENDIF
552
553	CASE ( 'read_from_file' )
554
555	ALLOCATE ( topo_height(0:ny,0:nx) )
556
557	DO ii = 0, io_blocks-1
558	IF ( ii == io_group ) THEN
559
560	!
561	!-- Arbitrary irregular topography data in PALM format (exactly
562	!-- matching the grid size and total domain size)
563	OPEN( 90, FILE='TOPOGRAPHY_DATA', STATUS='OLD', &
564	FORM='FORMATTED', ERR=10 )
565	DO j = ny, 0, -1
566	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
567	ENDDO
568
569	GOTO 12
570
571	10 message_string = 'file TOPOGRAPHY_DATA does not exist'
572	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
573
574	11 message_string = 'errors in file TOPOGRAPHY_DATA'
575	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
576
577	12 CLOSE( 90 )
578
579	ENDIF
580	#if defined( __parallel ) && ! defined ( __check )
581	CALL MPI_BARRIER( comm2d, ierr )
582	#endif
583	ENDDO
584
585	!
586	!-- Calculate the index height of the topography
587	DO i = 0, nx
588	DO j = 0, ny
589	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
590	ENDDO
591	ENDDO
592
593	DEALLOCATE ( topo_height )
594	!
595	!-- Add cyclic boundaries (additional layers are for calculating
596	!-- flag arrays needed for the multigrid sover)
597	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
598	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
599	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
600	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
601
602	CASE DEFAULT
603	!
604	!-- The DEFAULT case is reached either if the parameter topography
605	!-- contains a wrong character string or if the user has defined a special
606	!-- case in the user interface. There, the subroutine user_init_grid
607	!-- checks which of these two conditions applies.
608	CALL user_init_grid( gls, nzb_local )
609
610	END SELECT
611	!
612	!-- Determine the maximum level of topography. Furthermore it is used for
613	!-- steering the degradation of order of the applied advection scheme.
614	!-- In case of non-cyclic lateral boundaries, the order of the advection
615	!-- scheme is reduced at the lateral boundaries up to nzt.
616	nzb_max = MAXVAL( nzb_local )
617	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
618	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
619	nzb_max = nzt
620	ENDIF
621
622	!
623	!-- Consistency checks and index array initialization are only required for
624	!-- non-flat topography, also the initialization of topography height arrays
625	!-- zu_s_inner and zw_w_inner
626	IF ( TRIM( topography ) /= 'flat' ) THEN
627
628	!
629	!-- Consistency checks
630	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
631	WRITE( message_string, * ) 'nzb_local values are outside the', &
632	'model domain', &
633	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
634	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
635	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
636	ENDIF
637
638	IF ( bc_lr == 'cyclic' ) THEN
639	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
640	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
641	message_string = 'nzb_local does not fulfill cyclic' // &
642	' boundary condition in x-direction'
643	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
644	ENDIF
645	ENDIF
646	IF ( bc_ns == 'cyclic' ) THEN
647	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
648	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
649	message_string = 'nzb_local does not fulfill cyclic' // &
650	' boundary condition in y-direction'
651	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
652	ENDIF
653	ENDIF
654
655	IF ( topography_grid_convention == 'cell_edge' ) THEN
656	!
657	!-- The array nzb_local as defined using the 'cell_edge' convention
658	!-- describes the actual total size of topography which is defined at the
659	!-- cell edges where u=0 on the topography walls in x-direction and v=0
660	!-- on the topography walls in y-direction. However, PALM uses individual
661	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
662	!-- Therefore, the extent of topography in nzb_local is now reduced by
663	!-- 1dx at the E topography walls and by 1dy at the N topography walls
664	!-- to form the basis for nzb_s_inner.
665	DO j = -gls, ny + gls
666	DO i = -gls, nx
667	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
668	ENDDO
669	ENDDO
670	!-- apply cyclic boundary conditions in x-direction
671	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
672	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
673	DO i = -gls, nx + gls
674	DO j = -gls, ny
675	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
676	ENDDO
677	ENDDO
678	!-- apply cyclic boundary conditions in y-direction
679	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
680	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
681	ENDIF
682
683	!
684	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
685	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
686	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
687
688	!
689	!-- Initialize remaining index arrays:
690	!-- first pre-initialize them with nzb_s_inner...
691	nzb_u_inner = nzb_s_inner
692	nzb_u_outer = nzb_s_inner
693	nzb_v_inner = nzb_s_inner
694	nzb_v_outer = nzb_s_inner
695	nzb_w_outer = nzb_s_inner
696	nzb_s_outer = nzb_s_inner
697
698	!
699	!-- ...then extend pre-initialized arrays in their according directions
700	!-- based on nzb_local using nzb_tmp as a temporary global index array
701
702	!
703	!-- nzb_s_outer:
704	!-- extend nzb_local east-/westwards first, then north-/southwards
705	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
706	DO j = -1, ny + 1
707	DO i = 0, nx
708	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
709	nzb_local(j,i+1) )
710	ENDDO
711	ENDDO
712	DO i = nxl, nxr
713	DO j = nys, nyn
714	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
715	nzb_tmp(j+1,i) )
716	ENDDO
717	!
718	!-- non-cyclic boundary conditions (overwritten by call of
719	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
720	IF ( nys == 0 ) THEN
721	j = -1
722	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
723	ENDIF
724	IF ( nys == ny ) THEN
725	j = ny + 1
726	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
727	ENDIF
728	ENDDO
729	!
730	!-- nzb_w_outer:
731	!-- identical to nzb_s_outer
732	nzb_w_outer = nzb_s_outer
733
734	!
735	!-- nzb_u_inner:
736	!-- extend nzb_local rightwards only
737	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
738	DO j = -1, ny + 1
739	DO i = 0, nx + 1
740	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
741	ENDDO
742	ENDDO
743	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
744
745	!
746	!-- nzb_u_outer:
747	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
748	DO i = nxl, nxr
749	DO j = nys, nyn
750	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
751	nzb_tmp(j+1,i) )
752	ENDDO
753	!
754	!-- non-cyclic boundary conditions (overwritten by call of
755	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
756	IF ( nys == 0 ) THEN
757	j = -1
758	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
759	ENDIF
760	IF ( nys == ny ) THEN
761	j = ny + 1
762	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
763	ENDIF
764	ENDDO
765
766	!
767	!-- nzb_v_inner:
768	!-- extend nzb_local northwards only
769	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
770	DO i = -1, nx + 1
771	DO j = 0, ny + 1
772	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
773	ENDDO
774	ENDDO
775	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
776
777	!
778	!-- nzb_v_outer:
779	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
780	DO j = nys, nyn
781	DO i = nxl, nxr
782	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
783	nzb_tmp(j,i+1) )
784	ENDDO
785	!
786	!-- non-cyclic boundary conditions (overwritten by call of
787	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
788	IF ( nxl == 0 ) THEN
789	i = -1
790	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
791	ENDIF
792	IF ( nxr == nx ) THEN
793	i = nx + 1
794	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
795	ENDIF
796	ENDDO
797	#if ! defined ( __check )
798	!
799	!-- Exchange of lateral boundary values (parallel computers) and cyclic
800	!-- boundary conditions, if applicable.
801	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
802	!-- they do not require exchange and are not included here.
803	CALL exchange_horiz_2d_int( nzb_u_inner )
804	CALL exchange_horiz_2d_int( nzb_u_outer )
805	CALL exchange_horiz_2d_int( nzb_v_inner )
806	CALL exchange_horiz_2d_int( nzb_v_outer )
807	CALL exchange_horiz_2d_int( nzb_w_outer )
808	CALL exchange_horiz_2d_int( nzb_s_outer )
809
810	!
811	!-- Allocate and set the arrays containing the topography height
812	IF ( myid == 0 ) THEN
813
814	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
815
816	DO i = 0, nx + 1
817	DO j = 0, ny + 1
818	zu_s_inner(i,j) = zu(nzb_local(j,i))
819	zw_w_inner(i,j) = zw(nzb_local(j,i))
820	ENDDO
821	ENDDO
822
823	ENDIF
824	#endif
825	ENDIF
826
827	#if ! defined ( __check )
828	!
829	!-- Preliminary: to be removed after completion of the topography code!
830	!-- Set the former default k index arrays nzb_2d
831	nzb_2d = nzb
832
833	!
834	!-- Set the individual index arrays which define the k index from which on
835	!-- the usual finite difference form (which does not use surface fluxes) is
836	!-- applied
837	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
838	nzb_diff_u = nzb_u_inner + 2
839	nzb_diff_v = nzb_v_inner + 2
840	nzb_diff_s_inner = nzb_s_inner + 2
841	nzb_diff_s_outer = nzb_s_outer + 2
842	ELSE
843	nzb_diff_u = nzb_u_inner + 1
844	nzb_diff_v = nzb_v_inner + 1
845	nzb_diff_s_inner = nzb_s_inner + 1
846	nzb_diff_s_outer = nzb_s_outer + 1
847	ENDIF
848
849	!
850	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
851	!-- for limitation of near-wall mixing length l_wall further below
852	corner_nl = 0
853	corner_nr = 0
854	corner_sl = 0
855	corner_sr = 0
856	wall_l = 0
857	wall_n = 0
858	wall_r = 0
859	wall_s = 0
860
861	DO i = nxl, nxr
862	DO j = nys, nyn
863	!
864	!-- u-component
865	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
866	wall_u(j,i) = 1.0 ! north wall (location of adjacent fluid)
867	fym(j,i) = 0.0
868	fyp(j,i) = 1.0
869	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
870	wall_u(j,i) = 1.0 ! south wall (location of adjacent fluid)
871	fym(j,i) = 1.0
872	fyp(j,i) = 0.0
873	ENDIF
874	!
875	!-- v-component
876	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
877	wall_v(j,i) = 1.0 ! rigth wall (location of adjacent fluid)
878	fxm(j,i) = 0.0
879	fxp(j,i) = 1.0
880	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
881	wall_v(j,i) = 1.0 ! left wall (location of adjacent fluid)
882	fxm(j,i) = 1.0
883	fxp(j,i) = 0.0
884	ENDIF
885	!
886	!-- w-component, also used for scalars, separate arrays for shear
887	!-- production of tke
888	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
889	wall_e_y(j,i) = 1.0 ! north wall (location of adjacent fluid)
890	wall_w_y(j,i) = 1.0
891	fwym(j,i) = 0.0
892	fwyp(j,i) = 1.0
893	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
894	wall_e_y(j,i) = -1.0 ! south wall (location of adjacent fluid)
895	wall_w_y(j,i) = 1.0
896	fwym(j,i) = 1.0
897	fwyp(j,i) = 0.0
898	ENDIF
899	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
900	wall_e_x(j,i) = 1.0 ! right wall (location of adjacent fluid)
901	wall_w_x(j,i) = 1.0
902	fwxm(j,i) = 0.0
903	fwxp(j,i) = 1.0
904	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
905	wall_e_x(j,i) = -1.0 ! left wall (location of adjacent fluid)
906	wall_w_x(j,i) = 1.0
907	fwxm(j,i) = 1.0
908	fwxp(j,i) = 0.0
909	ENDIF
910	!
911	!-- Wall and corner locations inside buildings for limitation of
912	!-- near-wall mixing length l_wall
913	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
914
915	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
916
917	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
918	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
919	nzb_s_inner(j,i-1) ) + 1
920	ENDIF
921
922	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
923	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
924	nzb_s_inner(j,i+1) ) + 1
925	ENDIF
926
927	ENDIF
928
929	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
930
931	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
932	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
933	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
934	nzb_s_inner(j,i-1) ) + 1
935	ENDIF
936
937	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
938	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
939	nzb_s_inner(j,i+1) ) + 1
940	ENDIF
941
942	ENDIF
943
944	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
945	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
946	ENDIF
947
948	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
949	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
950	ENDIF
951
952	ENDDO
953	ENDDO
954
955	!
956	!-- Calculate wall flag arrays for the multigrid method
957	IF ( psolver == 'multigrid' ) THEN
958	!
959	!-- Gridpoint increment of the current level
960	inc = 1
961
962	DO l = maximum_grid_level, 1 , -1
963
964	nxl_l = nxl_mg(l)
965	nxr_l = nxr_mg(l)
966	nys_l = nys_mg(l)
967	nyn_l = nyn_mg(l)
968	nzt_l = nzt_mg(l)
969
970	!
971	!-- Assign the flag level to be calculated
972	SELECT CASE ( l )
973	CASE ( 1 )
974	flags => wall_flags_1
975	CASE ( 2 )
976	flags => wall_flags_2
977	CASE ( 3 )
978	flags => wall_flags_3
979	CASE ( 4 )
980	flags => wall_flags_4
981	CASE ( 5 )
982	flags => wall_flags_5
983	CASE ( 6 )
984	flags => wall_flags_6
985	CASE ( 7 )
986	flags => wall_flags_7
987	CASE ( 8 )
988	flags => wall_flags_8
989	CASE ( 9 )
990	flags => wall_flags_9
991	CASE ( 10 )
992	flags => wall_flags_10
993	END SELECT
994
995	!
996	!-- Depending on the grid level, set the respective bits in case of
997	!-- neighbouring walls
998	!-- Bit 0: wall to the bottom
999	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
1000	!-- Bit 2: wall to the south
1001	!-- Bit 3: wall to the north
1002	!-- Bit 4: wall to the left
1003	!-- Bit 5: wall to the right
1004	!-- Bit 6: inside building
1005
1006	flags = 0
1007
1008	!
1009	!-- In case of masking method, flags are not set and multigrid method
1010	!-- works like FFT-solver
1011	IF ( .NOT. masking_method ) THEN
1012
1013	DO i = nxl_l-1, nxr_l+1
1014	DO j = nys_l-1, nyn_l+1
1015	DO k = nzb, nzt_l+1
1016
1017	!
1018	!-- Inside/outside building (inside building does not need
1019	!-- further tests for walls)
1020	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
1021
1022	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
1023
1024	ELSE
1025	!
1026	!-- Bottom wall
1027	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
1028	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
1029	ENDIF
1030	!
1031	!-- South wall
1032	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
1033	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
1034	ENDIF
1035	!
1036	!-- North wall
1037	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
1038	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
1039	ENDIF
1040	!
1041	!-- Left wall
1042	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
1043	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
1044	ENDIF
1045	!
1046	!-- Right wall
1047	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
1048	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
1049	ENDIF
1050
1051	ENDIF
1052
1053	ENDDO
1054	ENDDO
1055	ENDDO
1056
1057	ENDIF
1058
1059	!
1060	!-- Test output of flag arrays
1061	! i = nxl_l
1062	! WRITE (9,*) ' '
1063	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
1064	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
1065	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
1066	! DO k = nzt_l+1, nzb, -1
1067	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
1068	! ENDDO
1069
1070	inc = inc * 2
1071
1072	ENDDO
1073
1074	ENDIF
1075	!
1076	!-- Allocate flags needed for masking walls.
1077	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr) )
1078	wall_flags_0 = 0
1079
1080	IF ( scalar_advec == 'ws-scheme' ) THEN
1081	!
1082	!-- Set flags to steer the degradation of the advection scheme in advec_ws
1083	!-- near topography, inflow- and outflow boundaries as well as bottom and
1084	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1085	!-- grid points.
1086	DO i = nxl, nxr
1087	DO j = nys, nyn
1088	DO k = nzb_s_inner(j,i)+1, nzt
1089	!
1090	!-- scalar - x-direction
1091	!-- WS1 (0), WS3 (1), WS5 (2)
1092	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1093	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1094	.AND. i == nxr ) ) THEN
1095	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
1096	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
1097	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1098	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1099	) THEN
1100	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
1101	ELSE
1102	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
1103	ENDIF
1104	!
1105	!-- scalar - y-direction
1106	!-- WS1 (3), WS3 (4), WS5 (5)
1107	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1108	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1109	.AND. j == nyn ) ) THEN
1110	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
1111	!-- WS3
1112	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
1113	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1114	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1115	) THEN
1116	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
1117	!-- WS5
1118	ELSE
1119	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
1120	ENDIF
1121	!
1122	!-- scalar - z-direction
1123	!-- WS1 (6), WS3 (7), WS5 (8)
1124	flag_set = .FALSE.
1125	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
1126	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
1127	flag_set = .TRUE.
1128	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1129	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
1130	flag_set = .TRUE.
1131	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
1132	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
1133	ENDIF
1134	ENDDO
1135	ENDDO
1136	ENDDO
1137	ENDIF
1138
1139	IF ( momentum_advec == 'ws-scheme' ) THEN
1140	!
1141	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
1142	!-- near topography, inflow- and outflow boundaries as well as bottom and
1143	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
1144	!-- grid points.
1145	DO i = nxl, nxr
1146	DO j = nys, nyn
1147	DO k = nzb_u_inner(j,i)+1, nzt
1148	!
1149	!-- u component - x-direction
1150	!-- WS1 (9), WS3 (10), WS5 (11)
1151	IF ( k <= nzb_u_inner(j,i+1) &
1152	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1153	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
1154	) THEN
1155	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
1156	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
1157	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
1158	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
1159	) THEN
1160	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
1161	ELSE
1162	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
1163	ENDIF
1164
1165	!
1166	!-- u component - y-direction
1167	!-- WS1 (12), WS3 (13), WS5 (14)
1168	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1169	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1170	.AND. j == nyn ) ) THEN
1171	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
1172	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
1173	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1174	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1175	) THEN
1176	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
1177	ELSE
1178	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
1179	ENDIF
1180	!
1181	!-- u component - z-direction
1182	!-- WS1 (15), WS3 (16), WS5 (17)
1183	flag_set = .FALSE.
1184	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
1185	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
1186	flag_set = .TRUE.
1187	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1188	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
1189	flag_set = .TRUE.
1190	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
1191	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
1192	ENDIF
1193
1194	ENDDO
1195	ENDDO
1196	ENDDO
1197
1198	DO i = nxl, nxr
1199	DO j = nys, nyn
1200	DO k = nzb_v_inner(j,i)+1, nzt
1201	!
1202	!-- v component - x-direction
1203	!-- WS1 (18), WS3 (19), WS5 (20)
1204	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1205	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
1206	.AND. i == nxr ) ) THEN
1207	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
1208	!-- WS3
1209	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
1210	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1211	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1212	) THEN
1213	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
1214	ELSE
1215	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
1216	ENDIF
1217	!
1218	!-- v component - y-direction
1219	!-- WS1 (21), WS3 (22), WS5 (23)
1220	IF ( k <= nzb_v_inner(j+1,i) &
1221	.OR. ( ( inflow_s .OR. outflow_s ) .AND. i == nysv ) &
1222	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
1223	) THEN
1224	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
1225	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
1226	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
1227	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
1228	) THEN
1229	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
1230	ELSE
1231	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
1232	ENDIF
1233	!
1234	!-- v component - z-direction
1235	!-- WS1 (24), WS3 (25), WS5 (26)
1236	flag_set = .FALSE.
1237	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
1238	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
1239	flag_set = .TRUE.
1240	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1241	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
1242	flag_set = .TRUE.
1243	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
1244	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
1245	ENDIF
1246
1247	ENDDO
1248	ENDDO
1249	ENDDO
1250	DO i = nxl, nxr
1251	DO j = nys, nyn
1252	DO k = nzb_w_inner(j,i)+1, nzt
1253	!
1254	!-- w component - x-direction
1255	!-- WS1 (27), WS3 (28), WS5 (29)
1256	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
1257	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
1258	.AND. i == nxr ) ) THEN
1259	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
1260	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
1261	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
1262	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
1263	) THEN
1264	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
1265	ELSE
1266	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
1267	ENDIF
1268	!
1269	!-- w component - y-direction
1270	!-- WS1 (30), WS3 (31), WS5 (32)
1271	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
1272	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
1273	.AND. j == nyn ) ) THEN
1274	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
1275	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
1276	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
1277	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
1278	) THEN
1279	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
1280	ELSE
1281	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 32 )
1282	ENDIF
1283	!
1284	!-- w component - z-direction
1285	!-- WS1 (33), WS3 (34), WS5 (35)
1286	flag_set = .FALSE.
1287	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
1288	.OR. k == nzt ) THEN
1289	!
1290	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
1291	!-- set, although this is not a prognostic level. However,
1292	!-- contrary to the advection of u,v and s this is necessary
1293	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
1294	!-- at k == nzb_w_inner(j,i)+1.
1295	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 33 )
1296	flag_set = .TRUE.
1297	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
1298	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 34 )
1299	flag_set = .TRUE.
1300	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
1301	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 35 )
1302	ENDIF
1303
1304	ENDDO
1305	ENDDO
1306	ENDDO
1307
1308	ENDIF
1309
1310	!
1311	!-- In case of topography: limit near-wall mixing length l_wall further:
1312	!-- Go through all points of the subdomain one by one and look for the closest
1313	!-- surface
1314	IF ( TRIM(topography) /= 'flat' ) THEN
1315	DO i = nxl, nxr
1316	DO j = nys, nyn
1317
1318	nzb_si = nzb_s_inner(j,i)
1319	vi = vertical_influence(nzb_si)
1320
1321	IF ( wall_n(j,i) > 0 ) THEN
1322	!
1323	!-- North wall (y distance)
1324	DO k = wall_n(j,i), nzb_si
1325	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5 * dy )
1326	ENDDO
1327	!
1328	!-- Above North wall (yz distance)
1329	DO k = nzb_si + 1, nzb_si + vi
1330	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
1331	SQRT( 0.25 * dy**2 + &
1332	( zu(k) - zw(nzb_si) )**2 ) )
1333	ENDDO
1334	!
1335	!-- Northleft corner (xy distance)
1336	IF ( corner_nl(j,i) > 0 ) THEN
1337	DO k = corner_nl(j,i), nzb_si
1338	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1339	0.5 * SQRT( dx2 + dy2 ) )
1340	ENDDO
1341	!
1342	!-- Above Northleft corner (xyz distance)
1343	DO k = nzb_si + 1, nzb_si + vi
1344	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
1345	SQRT( 0.25 * (dx2 + dy2) + &
1346	( zu(k) - zw(nzb_si) )**2 ) )
1347	ENDDO
1348	ENDIF
1349	!
1350	!-- Northright corner (xy distance)
1351	IF ( corner_nr(j,i) > 0 ) THEN
1352	DO k = corner_nr(j,i), nzb_si
1353	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1354	0.5 * SQRT( dx2 + dy2 ) )
1355	ENDDO
1356	!
1357	!-- Above northright corner (xyz distance)
1358	DO k = nzb_si + 1, nzb_si + vi
1359	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
1360	SQRT( 0.25 * (dx2 + dy2) + &
1361	( zu(k) - zw(nzb_si) )**2 ) )
1362	ENDDO
1363	ENDIF
1364	ENDIF
1365
1366	IF ( wall_s(j,i) > 0 ) THEN
1367	!
1368	!-- South wall (y distance)
1369	DO k = wall_s(j,i), nzb_si
1370	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5 * dy )
1371	ENDDO
1372	!
1373	!-- Above south wall (yz distance)
1374	DO k = nzb_si + 1, &
1375	nzb_si + vi
1376	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
1377	SQRT( 0.25 * dy**2 + &
1378	( zu(k) - zw(nzb_si) )**2 ) )
1379	ENDDO
1380	!
1381	!-- Southleft corner (xy distance)
1382	IF ( corner_sl(j,i) > 0 ) THEN
1383	DO k = corner_sl(j,i), nzb_si
1384	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1385	0.5 * SQRT( dx2 + dy2 ) )
1386	ENDDO
1387	!
1388	!-- Above southleft corner (xyz distance)
1389	DO k = nzb_si + 1, nzb_si + vi
1390	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
1391	SQRT( 0.25 * (dx2 + dy2) + &
1392	( zu(k) - zw(nzb_si) )**2 ) )
1393	ENDDO
1394	ENDIF
1395	!
1396	!-- Southright corner (xy distance)
1397	IF ( corner_sr(j,i) > 0 ) THEN
1398	DO k = corner_sr(j,i), nzb_si
1399	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1400	0.5 * SQRT( dx2 + dy2 ) )
1401	ENDDO
1402	!
1403	!-- Above southright corner (xyz distance)
1404	DO k = nzb_si + 1, nzb_si + vi
1405	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
1406	SQRT( 0.25 * (dx2 + dy2) + &
1407	( zu(k) - zw(nzb_si) )**2 ) )
1408	ENDDO
1409	ENDIF
1410
1411	ENDIF
1412
1413	IF ( wall_l(j,i) > 0 ) THEN
1414	!
1415	!-- Left wall (x distance)
1416	DO k = wall_l(j,i), nzb_si
1417	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5 * dx )
1418	ENDDO
1419	!
1420	!-- Above left wall (xz distance)
1421	DO k = nzb_si + 1, nzb_si + vi
1422	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
1423	SQRT( 0.25 * dx**2 + &
1424	( zu(k) - zw(nzb_si) )**2 ) )
1425	ENDDO
1426	ENDIF
1427
1428	IF ( wall_r(j,i) > 0 ) THEN
1429	!
1430	!-- Right wall (x distance)
1431	DO k = wall_r(j,i), nzb_si
1432	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5 * dx )
1433	ENDDO
1434	!
1435	!-- Above right wall (xz distance)
1436	DO k = nzb_si + 1, nzb_si + vi
1437	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
1438	SQRT( 0.25 * dx**2 + &
1439	( zu(k) - zw(nzb_si) )**2 ) )
1440	ENDDO
1441
1442	ENDIF
1443
1444	ENDDO
1445	ENDDO
1446
1447	ENDIF
1448
1449	!
1450	!-- Multiplication with wall_adjustment_factor
1451	l_wall = wall_adjustment_factor * l_wall
1452
1453	!
1454	!-- Set lateral boundary conditions for l_wall
1455	CALL exchange_horiz( l_wall, nbgp )
1456
1457	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
1458	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
1459
1460	#endif
1461
1462	END SUBROUTINE init_grid

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