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source: palm/trunk/SOURCE/init_grid.f90 @ 1088

Last change on this file since 1088 was 1070, checked in by maronga, 12 years ago
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[1]	1	SUBROUTINE init_grid
	2
[1036]	3	!--------------------------------------------------------------------------------!
	4	! This file is part of PALM.
	5	!
	6	! PALM is free software: you can redistribute it and/or modify it under the terms
	7	! of the GNU General Public License as published by the Free Software Foundation,
	8	! either version 3 of the License, or (at your option) any later version.
	9	!
	10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	13	!
	14	! You should have received a copy of the GNU General Public License along with
	15	! PALM. If not, see <http://www.gnu.org/licenses/>.
	16	!
	17	! Copyright 1997-2012 Leibniz University Hannover
	18	!--------------------------------------------------------------------------------!
	19	!
[254]	20	! Current revisions:
[1]	21	! -----------------
[863]	22	!
[1070]	23	!
[863]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1070 2012-11-28 16:26:33Z raasch $
	27	!
[1070]	28	! 1069 2012-11-28 16:18:43Z maronga
	29	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	30	! model in case of coupled runs
	31	!
[1037]	32	! 1036 2012-10-22 13:43:42Z raasch
	33	! code put under GPL (PALM 3.9)
	34	!
[1017]	35	! 1015 2012-09-27 09:23:24Z raasch
	36	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	37	! nzb_w_inner+1
	38	!
[997]	39	! 996 2012-09-07 10:41:47Z raasch
	40	! little reformatting
	41	!
[979]	42	! 978 2012-08-09 08:28:32Z fricke
	43	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	44	! Bugfix: Set wall_flags_0 for inflow boundary
	45	!
[928]	46	! 927 2012-06-06 19:15:04Z raasch
	47	! Wall flags are not set for multigrid method in case of masking method
	48	!
[865]	49	! 864 2012-03-27 15:10:33Z gryschka
[927]	50	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	51	! were not correctly defined for k=1.
[865]	52	!
[863]	53	! 861 2012-03-26 14:18:34Z suehring
[861]	54	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	55	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	56	! model domain.!
[861]	57	! Initialization of nzb_s_inner and nzb_w_inner.
	58	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	59	! while setting wall_flags_0
	60	!
[844]	61	! 843 2012-02-29 15:16:21Z gryschka
	62	! In case of ocean and dirichlet bc for u and v at the bottom
	63	! the first u-level ist defined at same height as the first w-level
	64	!
[819]	65	! 818 2012-02-08 16:11:23Z maronga
	66	! Bugfix: topo_height is only required if topography is used. It is thus now
	67	! allocated in the topography branch
	68	!
[810]	69	! 809 2012-01-30 13:32:58Z maronga
	70	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	71	!
[808]	72	! 807 2012-01-25 11:53:51Z maronga
	73	! New cpp directive "__check" implemented which is used by check_namelist_files
	74	!
[760]	75	! 759 2011-09-15 13:58:31Z raasch
	76	! Splitting of parallel I/O in blocks of PEs
	77	!
[723]	78	! 722 2011-04-11 06:21:09Z raasch
	79	! Bugfix: bc_lr/ns_cyc replaced by bc_lr/ns, because variables are not yet set
	80	! here
	81	!
[710]	82	! 709 2011-03-30 09:31:40Z raasch
	83	! formatting adjustments
	84	!
[708]	85	! 707 2011-03-29 11:39:40Z raasch
	86	! bc_lr/ns replaced by bc_lr/ns_cyc
	87	!
[668]	88	! 667 2010-12-23 12:06:00Z suehring/gryschka
[667]	89	! Definition of new array bounds nxlg, nxrg, nysg, nyng on each PE.
	90	! Furthermore the allocation of arrays and steering of loops is done with these
	91	! parameters. Call of exchange_horiz are modified.
	92	! In case of dirichlet bounday condition at the bottom zu(0)=0.0
	93	! dzu_mg has to be set explicitly for a equally spaced grid near bottom.
	94	! ddzu_pres added to use a equally spaced grid near bottom.
[139]	95	!
[556]	96	! 555 2010-09-07 07:32:53Z raasch
[818]	97	! Bugfix: default setting of nzb_local for flat topography
[556]	98	!
[392]	99	! 274 2009-03-26 15:11:21Z heinze
	100	! Output of messages replaced by message handling routine.
	101	! new topography case 'single_street_canyon'
	102	!
[226]	103	! 217 2008-12-09 18:00:48Z letzel
	104	! +topography_grid_convention
	105	!
[139]	106	! 134 2007-11-21 07:28:38Z letzel
[134]	107	! Redefine initial nzb_local as the actual total size of topography (later the
	108	! extent of topography in nzb_local is reduced by 1dx at the E topography walls
	109	! and by 1dy at the N topography walls to form the basis for nzb_s_inner);
	110	! for consistency redefine 'single_building' case.
[114]	111	! Calculation of wall flag arrays
[1]	112	!
[98]	113	! 94 2007-06-01 15:25:22Z raasch
	114	! Grid definition for ocean version
	115	!
[77]	116	! 75 2007-03-22 09:54:05Z raasch
	117	! storage of topography height arrays zu_s_inner and zw_s_inner,
	118	! 2nd+3rd argument removed from exchange horiz
	119	!
[39]	120	! 19 2007-02-23 04:53:48Z raasch
	121	! Setting of nzt_diff
	122	!
[3]	123	! RCS Log replace by Id keyword, revision history cleaned up
	124	!
[1]	125	! Revision 1.17 2006/08/22 14:00:05 raasch
	126	! +dz_max to limit vertical stretching,
	127	! bugfix in index array initialization for line- or point-like topography
	128	! structures
	129	!
	130	! Revision 1.1 1997/08/11 06:17:45 raasch
	131	! Initial revision (Testversion)
	132	!
	133	!
	134	! Description:
	135	! ------------
	136	! Creating grid depending constants
	137	!------------------------------------------------------------------------------!
	138
	139	USE arrays_3d
	140	USE control_parameters
	141	USE grid_variables
	142	USE indices
	143	USE pegrid
	144
	145	IMPLICIT NONE
	146
[240]	147	INTEGER :: bh, blx, bly, bxl, bxr, byn, bys, ch, cwx, cwy, cxl, cxr, cyn, &
[759]	148	cys, gls, i, ii, inc, i_center, j, j_center, k, l, nxl_l, &
	149	nxr_l, nyn_l, nys_l, nzb_si, nzt_l, vi
[1]	150
	151	INTEGER, DIMENSION(:), ALLOCATABLE :: vertical_influence
	152
	153	INTEGER, DIMENSION(:,:), ALLOCATABLE :: corner_nl, corner_nr, corner_sl, &
	154	corner_sr, wall_l, wall_n, wall_r,&
	155	wall_s, nzb_local, nzb_tmp
	156
[861]	157	LOGICAL :: flag_set = .FALSE.
	158
[1]	159	REAL :: dx_l, dy_l, dz_stretched
	160
[818]	161	REAL, DIMENSION(:,:), ALLOCATABLE :: topo_height
[1]	162
	163	REAL, DIMENSION(:,:,:), ALLOCATABLE :: distance
[667]	164
[1]	165	!
[709]	166	!-- Calculation of horizontal array bounds including ghost layers
[667]	167	nxlg = nxl - nbgp
	168	nxrg = nxr + nbgp
	169	nysg = nys - nbgp
	170	nyng = nyn + nbgp
[709]	171
[667]	172	!
[1]	173	!-- Allocate grid arrays
	174	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	175	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	176
	177	!
	178	!-- Compute height of u-levels from constant grid length and dz stretch factors
	179	IF ( dz == -1.0 ) THEN
[254]	180	message_string = 'missing dz'
	181	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1]	182	ELSEIF ( dz <= 0.0 ) THEN
[254]	183	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	184	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	185	ENDIF
[94]	186
[1]	187	!
[94]	188	!-- Define the vertical grid levels
	189	IF ( .NOT. ocean ) THEN
	190	!
	191	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	192	!-- The second u-level (k=1) corresponds to the top of the
[94]	193	!-- Prandtl-layer.
[667]	194
	195	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
	196	zu(0) = 0.0
	197	! zu(0) = - dz * 0.5
	198	ELSE
	199	zu(0) = - dz * 0.5
	200	ENDIF
[94]	201	zu(1) = dz * 0.5
[1]	202
[94]	203	dz_stretch_level_index = nzt+1
	204	dz_stretched = dz
	205	DO k = 2, nzt+1
	206	IF ( dz_stretch_level <= zu(k-1) .AND. 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 == nzt+1 ) dz_stretch_level_index = k-1
	210	ENDIF
	211	zu(k) = zu(k-1) + dz_stretched
	212	ENDDO
[1]	213
	214	!
[94]	215	!-- Compute the w-levels. They are always staggered half-way between the
[843]	216	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	217	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	218	!-- The top w-level is extrapolated linearly.
[94]	219	zw(0) = 0.0
	220	DO k = 1, nzt
	221	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	222	ENDDO
	223	zw(nzt+1) = zw(nzt) + 2.0 * ( zu(nzt+1) - zw(nzt) )
[1]	224
[94]	225	ELSE
[1]	226	!
[843]	227	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	228	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	229	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	230	!-- w-level are defined at same height, but staggered from the second level.
	231	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[94]	232	zu(nzt+1) = dz * 0.5
	233	zu(nzt) = - dz * 0.5
	234
	235	dz_stretch_level_index = 0
	236	dz_stretched = dz
	237	DO k = nzt-1, 0, -1
	238	IF ( dz_stretch_level <= ABS( zu(k+1) ) .AND. &
	239	dz_stretched < dz_max ) THEN
	240	dz_stretched = dz_stretched * dz_stretch_factor
	241	dz_stretched = MIN( dz_stretched, dz_max )
	242	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	243	ENDIF
	244	zu(k) = zu(k+1) - dz_stretched
	245	ENDDO
	246
	247	!
	248	!-- Compute the w-levels. They are always staggered half-way between the
[843]	249	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	250	!-- at the ground. In this case the first u- and w-level are defined at
	251	!-- same height. The top w-level (nzt+1) is not used but set for
	252	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	253	zw(nzt+1) = dz
	254	zw(nzt) = 0.0
	255	DO k = 0, nzt
	256	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	257	ENDDO
	258
[843]	259	!
	260	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	261	!-- at same height.
	262	IF ( ibc_uv_b == 0 ) THEN
	263	zu(0) = zw(0)
	264	ENDIF
	265
[94]	266	ENDIF
	267
	268	!
[1]	269	!-- Compute grid lengths.
	270	DO k = 1, nzt+1
	271	dzu(k) = zu(k) - zu(k-1)
	272	ddzu(k) = 1.0 / dzu(k)
	273	dzw(k) = zw(k) - zw(k-1)
	274	ddzw(k) = 1.0 / dzw(k)
	275	ENDDO
	276
	277	DO k = 1, nzt
	278	dd2zu(k) = 1.0 / ( dzu(k) + dzu(k+1) )
	279	ENDDO
[667]	280
	281	!
[709]	282	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	283	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	284	!-- is only dz/2, but should be dz. Therefore, an additional array
	285	!-- containing with appropriate grid information is created for these
	286	!-- solvers.
	287	IF ( psolver /= 'multigrid' ) THEN
[667]	288	ALLOCATE( ddzu_pres(1:nzt+1) )
	289	ddzu_pres = ddzu
[864]	290	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	291	ENDIF
[1]	292
	293	!
	294	!-- In case of multigrid method, compute grid lengths and grid factors for the
	295	!-- grid levels
	296	IF ( psolver == 'multigrid' ) THEN
	297
	298	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	299	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	300	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	301	f1_mg(nzb+1:nzt,maximum_grid_level), &
	302	f2_mg(nzb+1:nzt,maximum_grid_level), &
	303	f3_mg(nzb+1:nzt,maximum_grid_level) )
	304
	305	dzu_mg(:,maximum_grid_level) = dzu
[667]	306	!
[864]	307	!-- Next line to ensure an equally spaced grid.
	308	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	309
[1]	310	dzw_mg(:,maximum_grid_level) = dzw
	311	nzt_l = nzt
	312	DO l = maximum_grid_level-1, 1, -1
	313	dzu_mg(nzb+1,l) = 2.0 * dzu_mg(nzb+1,l+1)
	314	dzw_mg(nzb+1,l) = 2.0 * dzw_mg(nzb+1,l+1)
	315	nzt_l = nzt_l / 2
	316	DO k = 2, nzt_l+1
	317	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	318	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	319	ENDDO
	320	ENDDO
	321
	322	nzt_l = nzt
	323	dx_l = dx
	324	dy_l = dy
	325	DO l = maximum_grid_level, 1, -1
	326	ddx2_mg(l) = 1.0 / dx_l**2
	327	ddy2_mg(l) = 1.0 / dy_l**2
	328	DO k = nzb+1, nzt_l
	329	f2_mg(k,l) = 1.0 / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	330	f3_mg(k,l) = 1.0 / ( dzu_mg(k,l) * dzw_mg(k,l) )
	331	f1_mg(k,l) = 2.0 * ( ddx2_mg(l) + ddy2_mg(l) ) + &
	332	f2_mg(k,l) + f3_mg(k,l)
	333	ENDDO
	334	nzt_l = nzt_l / 2
	335	dx_l = dx_l * 2.0
	336	dy_l = dy_l * 2.0
	337	ENDDO
	338
	339	ENDIF
	340
	341	!
	342	!-- Compute the reciprocal values of the horizontal grid lengths.
	343	ddx = 1.0 / dx
	344	ddy = 1.0 / dy
	345	dx2 = dx * dx
	346	dy2 = dy * dy
	347	ddx2 = 1.0 / dx2
	348	ddy2 = 1.0 / dy2
	349
	350	!
	351	!-- Compute the grid-dependent mixing length.
	352	DO k = 1, nzt
	353	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333
	354	ENDDO
	355
	356	!
	357	!-- Allocate outer and inner index arrays for topography and set
[114]	358	!-- defaults.
	359	!-- nzb_local has to contain additional layers of ghost points for calculating
	360	!-- the flag arrays needed for the multigrid method
	361	gls = 2**( maximum_grid_level )
[861]	362	IF ( gls < nbgp ) gls = nbgp
[667]	363
[114]	364	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	365	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	366	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	367	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	368	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	369	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	370	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	371	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	372	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	373	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	374	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	375	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	376	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	377	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	378	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	379	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	380	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	381	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	382	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	383	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	384	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	385	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	386	nzb_2d(nysg:nyng,nxlg:nxrg), &
	387	wall_e_x(nysg:nyng,nxlg:nxrg), &
	388	wall_e_y(nysg:nyng,nxlg:nxrg), &
	389	wall_u(nysg:nyng,nxlg:nxrg), &
	390	wall_v(nysg:nyng,nxlg:nxrg), &
	391	wall_w_x(nysg:nyng,nxlg:nxrg), &
	392	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	393
	394
[667]	395
	396	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	397
[818]	398
[1]	399	nzb_s_inner = nzb; nzb_s_outer = nzb
	400	nzb_u_inner = nzb; nzb_u_outer = nzb
	401	nzb_v_inner = nzb; nzb_v_outer = nzb
	402	nzb_w_inner = nzb; nzb_w_outer = nzb
	403
	404	!
[19]	405	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	406	!-- form (which does not use surface fluxes) is applied
	407	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	408	nzb_diff = nzb + 2
	409	ELSE
	410	nzb_diff = nzb + 1
	411	ENDIF
[19]	412	IF ( use_top_fluxes ) THEN
	413	nzt_diff = nzt - 1
	414	ELSE
	415	nzt_diff = nzt
	416	ENDIF
[1]	417
	418	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	419	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	420
	421	wall_e_x = 0.0; wall_e_y = 0.0; wall_u = 0.0; wall_v = 0.0
	422	wall_w_x = 0.0; wall_w_y = 0.0
	423	fwxp = 1.0; fwxm = 1.0; fwyp = 1.0; fwym = 1.0
	424	fxp = 1.0; fxm = 1.0; fyp = 1.0; fym = 1.0
	425
	426	!
	427	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	428	!-- for the moment,
	429	!-- multiplication with wall_adjustment_factor near the end of this routine
	430	l_wall(nzb,:,:) = l_grid(1)
	431	DO k = nzb+1, nzt
	432	l_wall(k,:,:) = l_grid(k)
	433	ENDDO
	434	l_wall(nzt+1,:,:) = l_grid(nzt)
	435
	436	ALLOCATE ( vertical_influence(nzb:nzt) )
	437	DO k = 1, nzt
	438	vertical_influence(k) = MIN ( INT( l_grid(k) / &
	439	( wall_adjustment_factor * dzw(k) ) + 0.5 ), nzt - k )
	440	ENDDO
	441
	442	DO k = 1, MAXVAL( nzb_s_inner )
	443	IF ( l_grid(k) > 1.5 * dx * wall_adjustment_factor .OR. &
	444	l_grid(k) > 1.5 * dy * wall_adjustment_factor ) THEN
[254]	445	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	446	'threshold given by only local', &
	447	' &horizontal reduction of near_wall ', &
	448	'mixing length l_wall', &
	449	' &starting from height level k = ', k, '.'
	450	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	451	EXIT
	452	ENDIF
	453	ENDDO
	454	vertical_influence(0) = vertical_influence(1)
	455
[667]	456	DO i = nxlg, nxrg
	457	DO j = nysg, nyng
[1]	458	DO k = nzb_s_inner(j,i) + 1, &
	459	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	460	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	461	ENDDO
	462	ENDDO
	463	ENDDO
	464
	465	!
	466	!-- Set outer and inner index arrays for non-flat topography.
	467	!-- Here consistency checks concerning domain size and periodicity are
	468	!-- necessary.
	469	!-- Within this SELECT CASE structure only nzb_local is initialized
	470	!-- individually depending on the chosen topography type, all other index
	471	!-- arrays are initialized further below.
	472	SELECT CASE ( TRIM( topography ) )
	473
	474	CASE ( 'flat' )
	475	!
[555]	476	!-- nzb_local is required for the multigrid solver
	477	nzb_local = 0
[1]	478
	479	CASE ( 'single_building' )
	480	!
	481	!-- Single rectangular building, by default centered in the middle of the
	482	!-- total domain
	483	blx = NINT( building_length_x / dx )
	484	bly = NINT( building_length_y / dy )
	485	bh = NINT( building_height / dz )
	486
	487	IF ( building_wall_left == 9999999.9 ) THEN
	488	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	489	ENDIF
	490	bxl = NINT( building_wall_left / dx )
	491	bxr = bxl + blx
	492
	493	IF ( building_wall_south == 9999999.9 ) THEN
	494	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	495	ENDIF
	496	bys = NINT( building_wall_south / dy )
	497	byn = bys + bly
	498
	499	!
	500	!-- Building size has to meet some requirements
	501	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	502	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	503	WRITE( message_string, * ) 'inconsistent building parameters:', &
	504	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	505	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	506	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	507	ENDIF
	508
	509	!
[217]	510	!-- Define the building.
[1]	511	nzb_local = 0
[134]	512	nzb_local(bys:byn,bxl:bxr) = bh
[1]	513
[240]	514	CASE ( 'single_street_canyon' )
	515	!
	516	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	517	!-- The canyon is centered in the other direction by default.
	518	IF ( canyon_width_x /= 9999999.9 ) THEN
	519	!
	520	!-- Street canyon in y direction
	521	cwx = NINT( canyon_width_x / dx )
	522	IF ( canyon_wall_left == 9999999.9 ) THEN
	523	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	524	ENDIF
	525	cxl = NINT( canyon_wall_left / dx )
	526	cxr = cxl + cwx
	527
	528	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	529	!
	530	!-- Street canyon in x direction
	531	cwy = NINT( canyon_width_y / dy )
	532	IF ( canyon_wall_south == 9999999.9 ) THEN
	533	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	534	ENDIF
	535	cys = NINT( canyon_wall_south / dy )
	536	cyn = cys + cwy
	537
	538	ELSE
[254]	539
	540	message_string = 'no street canyon width given'
	541	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	542
[240]	543	ENDIF
	544
	545	ch = NINT( canyon_height / dz )
	546	dp_level_ind_b = ch
	547	!
	548	!-- Street canyon size has to meet some requirements
	549	IF ( canyon_width_x /= 9999999.9 ) THEN
	550	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
	551	( ch < 3 ) ) THEN
[254]	552	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	553	'&cxl=', cxl, 'cxr=', cxr, &
	554	'cwx=', cwx, &
[254]	555	'ch=', ch, 'nx=', nx, 'ny=', ny
	556	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	557	ENDIF
	558	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	559	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
	560	( ch < 3 ) ) THEN
[254]	561	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	562	'&cys=', cys, 'cyn=', cyn, &
	563	'cwy=', cwy, &
[254]	564	'ch=', ch, 'nx=', nx, 'ny=', ny
	565	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	566	ENDIF
	567	ENDIF
[274]	568	IF ( canyon_width_x /= 9999999.9 .AND. canyon_width_y /= 9999999.9 ) &
[240]	569	THEN
[274]	570	message_string = 'inconsistent canyon parameters:' // &
[254]	571	'&street canyon can only be oriented' // &
	572	'&either in x- or in y-direction'
	573	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	574	ENDIF
	575
	576	nzb_local = ch
	577	IF ( canyon_width_x /= 9999999.9 ) THEN
	578	nzb_local(:,cxl+1:cxr-1) = 0
	579	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	580	nzb_local(cys+1:cyn-1,:) = 0
	581	ENDIF
	582
[1]	583	CASE ( 'read_from_file' )
[759]	584
[818]	585	ALLOCATE ( topo_height(0:ny,0:nx) )
	586
[759]	587	DO ii = 0, io_blocks-1
	588	IF ( ii == io_group ) THEN
	589
[1]	590	!
[759]	591	!-- Arbitrary irregular topography data in PALM format (exactly
	592	!-- matching the grid size and total domain size)
[1069]	593	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	594	FORM='FORMATTED', ERR=10 )
	595	DO j = ny, 0, -1
	596	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	597	ENDDO
	598
	599	GOTO 12
	600
[1069]	601	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	602	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	603
[1069]	604	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	605	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	606
	607	12 CLOSE( 90 )
	608
	609	ENDIF
[809]	610	#if defined( __parallel ) && ! defined ( __check )
[759]	611	CALL MPI_BARRIER( comm2d, ierr )
	612	#endif
[559]	613	ENDDO
[759]	614
[1]	615	!
	616	!-- Calculate the index height of the topography
	617	DO i = 0, nx
	618	DO j = 0, ny
	619	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
	620	ENDDO
	621	ENDDO
[818]	622
	623	DEALLOCATE ( topo_height )
[114]	624	!
[759]	625	!-- Add cyclic boundaries (additional layers are for calculating
	626	!-- flag arrays needed for the multigrid sover)
[114]	627	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	628	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	629	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	630	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	631
[1]	632	CASE DEFAULT
	633	!
	634	!-- The DEFAULT case is reached either if the parameter topography
[217]	635	!-- contains a wrong character string or if the user has defined a special
[1]	636	!-- case in the user interface. There, the subroutine user_init_grid
	637	!-- checks which of these two conditions applies.
[114]	638	CALL user_init_grid( gls, nzb_local )
[1]	639
	640	END SELECT
	641	!
[861]	642	!-- Determine the maximum level of topography. Furthermore it is used for
	643	!-- steering the degradation of order of the applied advection scheme.
[978]	644	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	645	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[861]	646	nzb_max = MAXVAL( nzb_local )
[978]	647	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
	648	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	649	nzb_max = nzt
	650	ENDIF
	651
[861]	652	!
[1]	653	!-- Consistency checks and index array initialization are only required for
[217]	654	!-- non-flat topography, also the initialization of topography height arrays
[49]	655	!-- zu_s_inner and zw_w_inner
[1]	656	IF ( TRIM( topography ) /= 'flat' ) THEN
	657
	658	!
	659	!-- Consistency checks
	660	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[274]	661	WRITE( message_string, * ) 'nzb_local values are outside the', &
	662	'model domain', &
	663	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
	664	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	665	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	666	ENDIF
	667
[722]	668	IF ( bc_lr == 'cyclic' ) THEN
[1]	669	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
	670	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[254]	671	message_string = 'nzb_local does not fulfill cyclic' // &
	672	' boundary condition in x-direction'
	673	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	674	ENDIF
	675	ENDIF
[722]	676	IF ( bc_ns == 'cyclic' ) THEN
[1]	677	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
	678	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[254]	679	message_string = 'nzb_local does not fulfill cyclic' // &
	680	' boundary condition in y-direction'
	681	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	682	ENDIF
	683	ENDIF
	684
[217]	685	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	686	!
[217]	687	!-- The array nzb_local as defined using the 'cell_edge' convention
	688	!-- describes the actual total size of topography which is defined at the
	689	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	690	!-- on the topography walls in y-direction. However, PALM uses individual
	691	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	692	!-- Therefore, the extent of topography in nzb_local is now reduced by
	693	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	694	!-- to form the basis for nzb_s_inner.
	695	DO j = -gls, ny + gls
	696	DO i = -gls, nx
	697	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	698	ENDDO
[134]	699	ENDDO
[217]	700	!-- apply cyclic boundary conditions in x-direction
	701	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	702	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	703	DO i = -gls, nx + gls
	704	DO j = -gls, ny
	705	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	706	ENDDO
[134]	707	ENDDO
[217]	708	!-- apply cyclic boundary conditions in y-direction
	709	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	710	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	711	ENDIF
[134]	712
[1]	713	!
	714	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	715	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	716	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	717
	718	!
	719	!-- Initialize remaining index arrays:
	720	!-- first pre-initialize them with nzb_s_inner...
	721	nzb_u_inner = nzb_s_inner
	722	nzb_u_outer = nzb_s_inner
	723	nzb_v_inner = nzb_s_inner
	724	nzb_v_outer = nzb_s_inner
	725	nzb_w_outer = nzb_s_inner
	726	nzb_s_outer = nzb_s_inner
	727
	728	!
	729	!-- ...then extend pre-initialized arrays in their according directions
	730	!-- based on nzb_local using nzb_tmp as a temporary global index array
	731
	732	!
	733	!-- nzb_s_outer:
	734	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	735	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	736	DO j = -1, ny + 1
	737	DO i = 0, nx
	738	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
	739	nzb_local(j,i+1) )
	740	ENDDO
	741	ENDDO
	742	DO i = nxl, nxr
	743	DO j = nys, nyn
	744	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	745	nzb_tmp(j+1,i) )
	746	ENDDO
	747	!
	748	!-- non-cyclic boundary conditions (overwritten by call of
	749	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	750	IF ( nys == 0 ) THEN
	751	j = -1
	752	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	753	ENDIF
	754	IF ( nys == ny ) THEN
	755	j = ny + 1
	756	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	757	ENDIF
	758	ENDDO
	759	!
	760	!-- nzb_w_outer:
	761	!-- identical to nzb_s_outer
	762	nzb_w_outer = nzb_s_outer
	763
	764	!
	765	!-- nzb_u_inner:
	766	!-- extend nzb_local rightwards only
[667]	767	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	768	DO j = -1, ny + 1
	769	DO i = 0, nx + 1
	770	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	771	ENDDO
	772	ENDDO
[667]	773	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	774
	775	!
	776	!-- nzb_u_outer:
	777	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	778	DO i = nxl, nxr
	779	DO j = nys, nyn
	780	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	781	nzb_tmp(j+1,i) )
	782	ENDDO
	783	!
	784	!-- non-cyclic boundary conditions (overwritten by call of
	785	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	786	IF ( nys == 0 ) THEN
	787	j = -1
	788	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	789	ENDIF
	790	IF ( nys == ny ) THEN
	791	j = ny + 1
	792	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	793	ENDIF
	794	ENDDO
	795
	796	!
	797	!-- nzb_v_inner:
	798	!-- extend nzb_local northwards only
[667]	799	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	800	DO i = -1, nx + 1
	801	DO j = 0, ny + 1
	802	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	803	ENDDO
	804	ENDDO
[667]	805	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	806
	807	!
	808	!-- nzb_v_outer:
	809	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	810	DO j = nys, nyn
	811	DO i = nxl, nxr
	812	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
	813	nzb_tmp(j,i+1) )
	814	ENDDO
	815	!
	816	!-- non-cyclic boundary conditions (overwritten by call of
	817	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	818	IF ( nxl == 0 ) THEN
	819	i = -1
	820	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	821	ENDIF
	822	IF ( nxr == nx ) THEN
	823	i = nx + 1
	824	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	825	ENDIF
	826	ENDDO
[809]	827	#if ! defined ( __check )
[1]	828	!
	829	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	830	!-- boundary conditions, if applicable.
	831	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	832	!-- they do not require exchange and are not included here.
	833	CALL exchange_horiz_2d_int( nzb_u_inner )
	834	CALL exchange_horiz_2d_int( nzb_u_outer )
	835	CALL exchange_horiz_2d_int( nzb_v_inner )
	836	CALL exchange_horiz_2d_int( nzb_v_outer )
	837	CALL exchange_horiz_2d_int( nzb_w_outer )
	838	CALL exchange_horiz_2d_int( nzb_s_outer )
	839
[49]	840	!
	841	!-- Allocate and set the arrays containing the topography height
	842	IF ( myid == 0 ) THEN
	843
	844	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	845
	846	DO i = 0, nx + 1
	847	DO j = 0, ny + 1
	848	zu_s_inner(i,j) = zu(nzb_local(j,i))
	849	zw_w_inner(i,j) = zw(nzb_local(j,i))
	850	ENDDO
	851	ENDDO
	852
	853	ENDIF
[807]	854	#endif
[1]	855	ENDIF
	856
[809]	857	#if ! defined ( __check )
[1]	858	!
	859	!-- Preliminary: to be removed after completion of the topography code!
	860	!-- Set the former default k index arrays nzb_2d
	861	nzb_2d = nzb
	862
	863	!
	864	!-- Set the individual index arrays which define the k index from which on
	865	!-- the usual finite difference form (which does not use surface fluxes) is
	866	!-- applied
	867	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	868	nzb_diff_u = nzb_u_inner + 2
	869	nzb_diff_v = nzb_v_inner + 2
	870	nzb_diff_s_inner = nzb_s_inner + 2
	871	nzb_diff_s_outer = nzb_s_outer + 2
	872	ELSE
	873	nzb_diff_u = nzb_u_inner + 1
	874	nzb_diff_v = nzb_v_inner + 1
	875	nzb_diff_s_inner = nzb_s_inner + 1
	876	nzb_diff_s_outer = nzb_s_outer + 1
	877	ENDIF
	878
	879	!
	880	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	881	!-- for limitation of near-wall mixing length l_wall further below
	882	corner_nl = 0
	883	corner_nr = 0
	884	corner_sl = 0
	885	corner_sr = 0
	886	wall_l = 0
	887	wall_n = 0
	888	wall_r = 0
	889	wall_s = 0
	890
	891	DO i = nxl, nxr
	892	DO j = nys, nyn
	893	!
	894	!-- u-component
	895	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
	896	wall_u(j,i) = 1.0 ! north wall (location of adjacent fluid)
	897	fym(j,i) = 0.0
	898	fyp(j,i) = 1.0
	899	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
	900	wall_u(j,i) = 1.0 ! south wall (location of adjacent fluid)
	901	fym(j,i) = 1.0
	902	fyp(j,i) = 0.0
	903	ENDIF
	904	!
	905	!-- v-component
	906	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
	907	wall_v(j,i) = 1.0 ! rigth wall (location of adjacent fluid)
	908	fxm(j,i) = 0.0
	909	fxp(j,i) = 1.0
	910	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
	911	wall_v(j,i) = 1.0 ! left wall (location of adjacent fluid)
	912	fxm(j,i) = 1.0
	913	fxp(j,i) = 0.0
	914	ENDIF
	915	!
	916	!-- w-component, also used for scalars, separate arrays for shear
	917	!-- production of tke
	918	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
	919	wall_e_y(j,i) = 1.0 ! north wall (location of adjacent fluid)
	920	wall_w_y(j,i) = 1.0
	921	fwym(j,i) = 0.0
	922	fwyp(j,i) = 1.0
	923	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
	924	wall_e_y(j,i) = -1.0 ! south wall (location of adjacent fluid)
	925	wall_w_y(j,i) = 1.0
	926	fwym(j,i) = 1.0
	927	fwyp(j,i) = 0.0
	928	ENDIF
	929	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
	930	wall_e_x(j,i) = 1.0 ! right wall (location of adjacent fluid)
	931	wall_w_x(j,i) = 1.0
	932	fwxm(j,i) = 0.0
	933	fwxp(j,i) = 1.0
	934	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
	935	wall_e_x(j,i) = -1.0 ! left wall (location of adjacent fluid)
	936	wall_w_x(j,i) = 1.0
	937	fwxm(j,i) = 1.0
	938	fwxp(j,i) = 0.0
	939	ENDIF
	940	!
	941	!-- Wall and corner locations inside buildings for limitation of
	942	!-- near-wall mixing length l_wall
	943	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	944
	945	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	946
	947	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	948	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	949	nzb_s_inner(j,i-1) ) + 1
	950	ENDIF
	951
	952	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	953	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	954	nzb_s_inner(j,i+1) ) + 1
	955	ENDIF
	956
	957	ENDIF
	958
	959	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	960
	961	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	962	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	963	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	964	nzb_s_inner(j,i-1) ) + 1
	965	ENDIF
	966
	967	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	968	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	969	nzb_s_inner(j,i+1) ) + 1
	970	ENDIF
	971
	972	ENDIF
	973
	974	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	975	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	976	ENDIF
	977
	978	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	979	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	980	ENDIF
	981
	982	ENDDO
	983	ENDDO
	984
	985	!
[114]	986	!-- Calculate wall flag arrays for the multigrid method
	987	IF ( psolver == 'multigrid' ) THEN
	988	!
	989	!-- Gridpoint increment of the current level
	990	inc = 1
	991
	992	DO l = maximum_grid_level, 1 , -1
	993
	994	nxl_l = nxl_mg(l)
	995	nxr_l = nxr_mg(l)
	996	nys_l = nys_mg(l)
	997	nyn_l = nyn_mg(l)
	998	nzt_l = nzt_mg(l)
	999
	1000	!
	1001	!-- Assign the flag level to be calculated
	1002	SELECT CASE ( l )
	1003	CASE ( 1 )
	1004	flags => wall_flags_1
	1005	CASE ( 2 )
	1006	flags => wall_flags_2
	1007	CASE ( 3 )
	1008	flags => wall_flags_3
	1009	CASE ( 4 )
	1010	flags => wall_flags_4
	1011	CASE ( 5 )
	1012	flags => wall_flags_5
	1013	CASE ( 6 )
	1014	flags => wall_flags_6
	1015	CASE ( 7 )
	1016	flags => wall_flags_7
	1017	CASE ( 8 )
	1018	flags => wall_flags_8
	1019	CASE ( 9 )
	1020	flags => wall_flags_9
	1021	CASE ( 10 )
	1022	flags => wall_flags_10
	1023	END SELECT
	1024
	1025	!
	1026	!-- Depending on the grid level, set the respective bits in case of
	1027	!-- neighbouring walls
	1028	!-- Bit 0: wall to the bottom
	1029	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1030	!-- Bit 2: wall to the south
	1031	!-- Bit 3: wall to the north
	1032	!-- Bit 4: wall to the left
	1033	!-- Bit 5: wall to the right
[116]	1034	!-- Bit 6: inside building
[114]	1035
	1036	flags = 0
	1037
[927]	1038	!
	1039	!-- In case of masking method, flags are not set and multigrid method
	1040	!-- works like FFT-solver
	1041	IF ( .NOT. masking_method ) THEN
	1042
	1043	DO i = nxl_l-1, nxr_l+1
	1044	DO j = nys_l-1, nyn_l+1
	1045	DO k = nzb, nzt_l+1
[114]	1046
	1047	!
[927]	1048	!-- Inside/outside building (inside building does not need
	1049	!-- further tests for walls)
	1050	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1051
[927]	1052	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1053
[927]	1054	ELSE
[114]	1055	!
[927]	1056	!-- Bottom wall
	1057	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1058	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1059	ENDIF
[114]	1060	!
[927]	1061	!-- South wall
	1062	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1063	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1064	ENDIF
[114]	1065	!
[927]	1066	!-- North wall
	1067	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1068	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1069	ENDIF
[114]	1070	!
[927]	1071	!-- Left wall
	1072	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1073	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1074	ENDIF
[114]	1075	!
[927]	1076	!-- Right wall
	1077	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1078	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1079	ENDIF
	1080
[114]	1081	ENDIF
	1082
[927]	1083	ENDDO
[114]	1084	ENDDO
	1085	ENDDO
	1086
[927]	1087	ENDIF
	1088
[114]	1089	!
	1090	!-- Test output of flag arrays
[145]	1091	! i = nxl_l
	1092	! WRITE (9,*) ' '
	1093	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1094	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1095	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1096	! DO k = nzt_l+1, nzb, -1
	1097	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1098	! ENDDO
[114]	1099
	1100	inc = inc * 2
	1101
	1102	ENDDO
	1103
	1104	ENDIF
[861]	1105	!
	1106	!-- Allocate flags needed for masking walls.
	1107	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr) )
	1108	wall_flags_0 = 0
[114]	1109
[861]	1110	IF ( scalar_advec == 'ws-scheme' ) THEN
[114]	1111	!
[861]	1112	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1113	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1114	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1115	!-- grid points.
	1116	DO i = nxl, nxr
	1117	DO j = nys, nyn
	1118	DO k = nzb_s_inner(j,i)+1, nzt
	1119	!
	1120	!-- scalar - x-direction
	1121	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1122	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1123	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1124	.AND. i == nxr ) ) THEN
[861]	1125	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1126	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1127	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1128	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1129	) THEN
[861]	1130	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1131	ELSE
	1132	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1133	ENDIF
	1134	!
	1135	!-- scalar - y-direction
	1136	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1137	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1138	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1139	.AND. j == nyn ) ) THEN
[861]	1140	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1141	!-- WS3
	1142	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1143	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1144	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1145	) THEN
[861]	1146	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1147	!-- WS5
	1148	ELSE
	1149	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1150	ENDIF
	1151	!
	1152	!-- scalar - z-direction
	1153	!-- WS1 (6), WS3 (7), WS5 (8)
	1154	flag_set = .FALSE.
	1155	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1156	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1157	flag_set = .TRUE.
	1158	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1159	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1160	flag_set = .TRUE.
	1161	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1162	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1163	ENDIF
	1164	ENDDO
	1165	ENDDO
	1166	ENDDO
	1167	ENDIF
	1168
	1169	IF ( momentum_advec == 'ws-scheme' ) THEN
	1170	!
	1171	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1172	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1173	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1174	!-- grid points.
	1175	DO i = nxl, nxr
	1176	DO j = nys, nyn
	1177	DO k = nzb_u_inner(j,i)+1, nzt
	1178	!
	1179	!-- u component - x-direction
	1180	!-- WS1 (9), WS3 (10), WS5 (11)
	1181	IF ( k <= nzb_u_inner(j,i+1) &
[978]	1182	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1183	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1184	) THEN
[861]	1185	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1186	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1187	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1188	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1189	) THEN
[861]	1190	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
	1191	ELSE
	1192	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
	1193	ENDIF
[978]	1194
[861]	1195	!
	1196	!-- u component - y-direction
	1197	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1198	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1199	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1200	.AND. j == nyn ) ) THEN
[861]	1201	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1202	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1203	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1204	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1205	) THEN
[861]	1206	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
	1207	ELSE
	1208	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
	1209	ENDIF
	1210	!
	1211	!-- u component - z-direction
	1212	!-- WS1 (15), WS3 (16), WS5 (17)
	1213	flag_set = .FALSE.
	1214	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1215	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1216	flag_set = .TRUE.
	1217	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1218	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1219	flag_set = .TRUE.
	1220	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1221	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1222	ENDIF
	1223
	1224	ENDDO
	1225	ENDDO
	1226	ENDDO
	1227
	1228	DO i = nxl, nxr
	1229	DO j = nys, nyn
	1230	DO k = nzb_v_inner(j,i)+1, nzt
	1231	!
	1232	!-- v component - x-direction
	1233	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1234	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1235	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1236	.AND. i == nxr ) ) THEN
[861]	1237	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1238	!-- WS3
	1239	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1240	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1241	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1242	) THEN
[861]	1243	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
	1244	ELSE
	1245	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
	1246	ENDIF
	1247	!
	1248	!-- v component - y-direction
	1249	!-- WS1 (21), WS3 (22), WS5 (23)
	1250	IF ( k <= nzb_v_inner(j+1,i) &
[978]	1251	.OR. ( ( inflow_s .OR. outflow_s ) .AND. i == nysv ) &
	1252	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1253	) THEN
[861]	1254	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1255	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1256	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1257	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1258	) THEN
[861]	1259	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
	1260	ELSE
	1261	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
	1262	ENDIF
	1263	!
	1264	!-- v component - z-direction
	1265	!-- WS1 (24), WS3 (25), WS5 (26)
	1266	flag_set = .FALSE.
	1267	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1268	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1269	flag_set = .TRUE.
	1270	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1271	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1272	flag_set = .TRUE.
	1273	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1274	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1275	ENDIF
	1276
	1277	ENDDO
	1278	ENDDO
	1279	ENDDO
	1280	DO i = nxl, nxr
	1281	DO j = nys, nyn
[1015]	1282	DO k = nzb_w_inner(j,i), nzt
[861]	1283	!
	1284	!-- w component - x-direction
	1285	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1286	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1287	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1288	.AND. i == nxr ) ) THEN
[861]	1289	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1290	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1291	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1292	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1293	) THEN
[861]	1294	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
	1295	ELSE
	1296	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
	1297	ENDIF
	1298	!
	1299	!-- w component - y-direction
	1300	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1301	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1302	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1303	.AND. j == nyn ) ) THEN
[861]	1304	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1305	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1306	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1307	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1308	) THEN
[861]	1309	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
	1310	ELSE
	1311	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 32 )
	1312	ENDIF
	1313	!
	1314	!-- w component - z-direction
	1315	!-- WS1 (33), WS3 (34), WS5 (35)
	1316	flag_set = .FALSE.
	1317	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1318	.OR. k == nzt ) THEN
	1319	!
	1320	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1321	!-- set, although this is not a prognostic level. However,
	1322	!-- contrary to the advection of u,v and s this is necessary
	1323	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1324	!-- at k == nzb_w_inner(j,i)+1.
	1325	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 33 )
	1326	flag_set = .TRUE.
	1327	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1328	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 34 )
	1329	flag_set = .TRUE.
	1330	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
	1331	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 35 )
	1332	ENDIF
	1333
	1334	ENDDO
	1335	ENDDO
	1336	ENDDO
	1337
	1338	ENDIF
	1339
	1340	!
[1]	1341	!-- In case of topography: limit near-wall mixing length l_wall further:
	1342	!-- Go through all points of the subdomain one by one and look for the closest
	1343	!-- surface
	1344	IF ( TRIM(topography) /= 'flat' ) THEN
	1345	DO i = nxl, nxr
	1346	DO j = nys, nyn
	1347
	1348	nzb_si = nzb_s_inner(j,i)
	1349	vi = vertical_influence(nzb_si)
	1350
	1351	IF ( wall_n(j,i) > 0 ) THEN
	1352	!
	1353	!-- North wall (y distance)
	1354	DO k = wall_n(j,i), nzb_si
	1355	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5 * dy )
	1356	ENDDO
	1357	!
	1358	!-- Above North wall (yz distance)
	1359	DO k = nzb_si + 1, nzb_si + vi
	1360	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1361	SQRT( 0.25 * dy**2 + &
	1362	( zu(k) - zw(nzb_si) )**2 ) )
	1363	ENDDO
	1364	!
	1365	!-- Northleft corner (xy distance)
	1366	IF ( corner_nl(j,i) > 0 ) THEN
	1367	DO k = corner_nl(j,i), nzb_si
	1368	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1369	0.5 * SQRT( dx2 + dy2 ) )
	1370	ENDDO
	1371	!
	1372	!-- Above Northleft corner (xyz distance)
	1373	DO k = nzb_si + 1, nzb_si + vi
	1374	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1375	SQRT( 0.25 * (dx2 + dy2) + &
	1376	( zu(k) - zw(nzb_si) )**2 ) )
	1377	ENDDO
	1378	ENDIF
	1379	!
	1380	!-- Northright corner (xy distance)
	1381	IF ( corner_nr(j,i) > 0 ) THEN
	1382	DO k = corner_nr(j,i), nzb_si
	1383	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1384	0.5 * SQRT( dx2 + dy2 ) )
	1385	ENDDO
	1386	!
	1387	!-- Above northright corner (xyz distance)
	1388	DO k = nzb_si + 1, nzb_si + vi
	1389	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1390	SQRT( 0.25 * (dx2 + dy2) + &
	1391	( zu(k) - zw(nzb_si) )**2 ) )
	1392	ENDDO
	1393	ENDIF
	1394	ENDIF
	1395
	1396	IF ( wall_s(j,i) > 0 ) THEN
	1397	!
	1398	!-- South wall (y distance)
	1399	DO k = wall_s(j,i), nzb_si
	1400	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5 * dy )
	1401	ENDDO
	1402	!
	1403	!-- Above south wall (yz distance)
	1404	DO k = nzb_si + 1, &
	1405	nzb_si + vi
	1406	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1407	SQRT( 0.25 * dy**2 + &
	1408	( zu(k) - zw(nzb_si) )**2 ) )
	1409	ENDDO
	1410	!
	1411	!-- Southleft corner (xy distance)
	1412	IF ( corner_sl(j,i) > 0 ) THEN
	1413	DO k = corner_sl(j,i), nzb_si
	1414	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1415	0.5 * SQRT( dx2 + dy2 ) )
	1416	ENDDO
	1417	!
	1418	!-- Above southleft corner (xyz distance)
	1419	DO k = nzb_si + 1, nzb_si + vi
	1420	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1421	SQRT( 0.25 * (dx2 + dy2) + &
	1422	( zu(k) - zw(nzb_si) )**2 ) )
	1423	ENDDO
	1424	ENDIF
	1425	!
	1426	!-- Southright corner (xy distance)
	1427	IF ( corner_sr(j,i) > 0 ) THEN
	1428	DO k = corner_sr(j,i), nzb_si
	1429	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1430	0.5 * SQRT( dx2 + dy2 ) )
	1431	ENDDO
	1432	!
	1433	!-- Above southright corner (xyz distance)
	1434	DO k = nzb_si + 1, nzb_si + vi
	1435	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1436	SQRT( 0.25 * (dx2 + dy2) + &
	1437	( zu(k) - zw(nzb_si) )**2 ) )
	1438	ENDDO
	1439	ENDIF
	1440
	1441	ENDIF
	1442
	1443	IF ( wall_l(j,i) > 0 ) THEN
	1444	!
	1445	!-- Left wall (x distance)
	1446	DO k = wall_l(j,i), nzb_si
	1447	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5 * dx )
	1448	ENDDO
	1449	!
	1450	!-- Above left wall (xz distance)
	1451	DO k = nzb_si + 1, nzb_si + vi
	1452	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1453	SQRT( 0.25 * dx**2 + &
	1454	( zu(k) - zw(nzb_si) )**2 ) )
	1455	ENDDO
	1456	ENDIF
	1457
	1458	IF ( wall_r(j,i) > 0 ) THEN
	1459	!
	1460	!-- Right wall (x distance)
	1461	DO k = wall_r(j,i), nzb_si
	1462	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5 * dx )
	1463	ENDDO
	1464	!
	1465	!-- Above right wall (xz distance)
	1466	DO k = nzb_si + 1, nzb_si + vi
	1467	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1468	SQRT( 0.25 * dx**2 + &
	1469	( zu(k) - zw(nzb_si) )**2 ) )
	1470	ENDDO
	1471
	1472	ENDIF
	1473
	1474	ENDDO
	1475	ENDDO
	1476
	1477	ENDIF
	1478
	1479	!
	1480	!-- Multiplication with wall_adjustment_factor
	1481	l_wall = wall_adjustment_factor * l_wall
	1482
	1483	!
[709]	1484	!-- Set lateral boundary conditions for l_wall
[667]	1485	CALL exchange_horiz( l_wall, nbgp )
	1486
[1]	1487	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1488	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1489
[807]	1490	#endif
[1]	1491
	1492	END SUBROUTINE init_grid

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