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source: palm/trunk/SOURCE/init_grid.f90 @ 947

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

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