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source: palm/trunk/SOURCE/init_grid.f90 @ 978

Last change on this file since 978 was 978, checked in by fricke, 12 years ago
merge fricke branch back into trunk
Property svn:keywords set to `Id`
File size: 55.1 KB

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

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