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source: palm/trunk/SOURCE/init_grid.f90 @ 1108

Last change on this file since 1108 was 1093, checked in by raasch, 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	! -----------------
[1093]	22	!
[863]	23	!
	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1093 2013-02-02 12:58:49Z raasch $
	27	!
[1093]	28	! 1092 2013-02-02 11:24:22Z raasch
	29	! unused variables removed
	30	!
[1070]	31	! 1069 2012-11-28 16:18:43Z maronga
	32	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	33	! model in case of coupled runs
	34	!
[1037]	35	! 1036 2012-10-22 13:43:42Z raasch
	36	! code put under GPL (PALM 3.9)
	37	!
[1017]	38	! 1015 2012-09-27 09:23:24Z raasch
	39	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	40	! nzb_w_inner+1
	41	!
[997]	42	! 996 2012-09-07 10:41:47Z raasch
	43	! little reformatting
	44	!
[979]	45	! 978 2012-08-09 08:28:32Z fricke
	46	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	47	! Bugfix: Set wall_flags_0 for inflow boundary
	48	!
[928]	49	! 927 2012-06-06 19:15:04Z raasch
	50	! Wall flags are not set for multigrid method in case of masking method
	51	!
[865]	52	! 864 2012-03-27 15:10:33Z gryschka
[927]	53	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	54	! were not correctly defined for k=1.
[865]	55	!
[863]	56	! 861 2012-03-26 14:18:34Z suehring
[861]	57	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	58	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	59	! model domain.!
[861]	60	! Initialization of nzb_s_inner and nzb_w_inner.
	61	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	62	! while setting wall_flags_0
	63	!
[844]	64	! 843 2012-02-29 15:16:21Z gryschka
	65	! In case of ocean and dirichlet bc for u and v at the bottom
	66	! the first u-level ist defined at same height as the first w-level
	67	!
[819]	68	! 818 2012-02-08 16:11:23Z maronga
	69	! Bugfix: topo_height is only required if topography is used. It is thus now
	70	! allocated in the topography branch
	71	!
[810]	72	! 809 2012-01-30 13:32:58Z maronga
	73	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	74	!
[808]	75	! 807 2012-01-25 11:53:51Z maronga
	76	! New cpp directive "__check" implemented which is used by check_namelist_files
	77	!
[760]	78	! 759 2011-09-15 13:58:31Z raasch
	79	! Splitting of parallel I/O in blocks of PEs
	80	!
[723]	81	! 722 2011-04-11 06:21:09Z raasch
	82	! Bugfix: bc_lr/ns_cyc replaced by bc_lr/ns, because variables are not yet set
	83	! here
	84	!
[710]	85	! 709 2011-03-30 09:31:40Z raasch
	86	! formatting adjustments
	87	!
[708]	88	! 707 2011-03-29 11:39:40Z raasch
	89	! bc_lr/ns replaced by bc_lr/ns_cyc
	90	!
[668]	91	! 667 2010-12-23 12:06:00Z suehring/gryschka
[667]	92	! Definition of new array bounds nxlg, nxrg, nysg, nyng on each PE.
	93	! Furthermore the allocation of arrays and steering of loops is done with these
	94	! parameters. Call of exchange_horiz are modified.
	95	! In case of dirichlet bounday condition at the bottom zu(0)=0.0
	96	! dzu_mg has to be set explicitly for a equally spaced grid near bottom.
	97	! ddzu_pres added to use a equally spaced grid near bottom.
[139]	98	!
[556]	99	! 555 2010-09-07 07:32:53Z raasch
[818]	100	! Bugfix: default setting of nzb_local for flat topography
[556]	101	!
[392]	102	! 274 2009-03-26 15:11:21Z heinze
	103	! Output of messages replaced by message handling routine.
	104	! new topography case 'single_street_canyon'
	105	!
[226]	106	! 217 2008-12-09 18:00:48Z letzel
	107	! +topography_grid_convention
	108	!
[139]	109	! 134 2007-11-21 07:28:38Z letzel
[134]	110	! Redefine initial nzb_local as the actual total size of topography (later the
	111	! extent of topography in nzb_local is reduced by 1dx at the E topography walls
	112	! and by 1dy at the N topography walls to form the basis for nzb_s_inner);
	113	! for consistency redefine 'single_building' case.
[114]	114	! Calculation of wall flag arrays
[1]	115	!
[98]	116	! 94 2007-06-01 15:25:22Z raasch
	117	! Grid definition for ocean version
	118	!
[77]	119	! 75 2007-03-22 09:54:05Z raasch
	120	! storage of topography height arrays zu_s_inner and zw_s_inner,
	121	! 2nd+3rd argument removed from exchange horiz
	122	!
[39]	123	! 19 2007-02-23 04:53:48Z raasch
	124	! Setting of nzt_diff
	125	!
[3]	126	! RCS Log replace by Id keyword, revision history cleaned up
	127	!
[1]	128	! Revision 1.17 2006/08/22 14:00:05 raasch
	129	! +dz_max to limit vertical stretching,
	130	! bugfix in index array initialization for line- or point-like topography
	131	! structures
	132	!
	133	! Revision 1.1 1997/08/11 06:17:45 raasch
	134	! Initial revision (Testversion)
	135	!
	136	!
	137	! Description:
	138	! ------------
	139	! Creating grid depending constants
	140	!------------------------------------------------------------------------------!
	141
	142	USE arrays_3d
	143	USE control_parameters
	144	USE grid_variables
	145	USE indices
	146	USE pegrid
	147
	148	IMPLICIT NONE
	149
[240]	150	INTEGER :: bh, blx, bly, bxl, bxr, byn, bys, ch, cwx, cwy, cxl, cxr, cyn, &
[1092]	151	cys, gls, i, ii, inc, j, k, l, nxl_l, nxr_l, nyn_l, nys_l, &
	152	nzb_si, nzt_l, vi
[1]	153
	154	INTEGER, DIMENSION(:), ALLOCATABLE :: vertical_influence
	155
	156	INTEGER, DIMENSION(:,:), ALLOCATABLE :: corner_nl, corner_nr, corner_sl, &
	157	corner_sr, wall_l, wall_n, wall_r,&
	158	wall_s, nzb_local, nzb_tmp
	159
[861]	160	LOGICAL :: flag_set = .FALSE.
	161
[1]	162	REAL :: dx_l, dy_l, dz_stretched
	163
[818]	164	REAL, DIMENSION(:,:), ALLOCATABLE :: topo_height
[1]	165
[667]	166
[1]	167	!
[709]	168	!-- Calculation of horizontal array bounds including ghost layers
[667]	169	nxlg = nxl - nbgp
	170	nxrg = nxr + nbgp
	171	nysg = nys - nbgp
	172	nyng = nyn + nbgp
[709]	173
[667]	174	!
[1]	175	!-- Allocate grid arrays
	176	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	177	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	178
	179	!
	180	!-- Compute height of u-levels from constant grid length and dz stretch factors
	181	IF ( dz == -1.0 ) THEN
[254]	182	message_string = 'missing dz'
	183	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1]	184	ELSEIF ( dz <= 0.0 ) THEN
[254]	185	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	186	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	187	ENDIF
[94]	188
[1]	189	!
[94]	190	!-- Define the vertical grid levels
	191	IF ( .NOT. ocean ) THEN
	192	!
	193	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	194	!-- The second u-level (k=1) corresponds to the top of the
[94]	195	!-- Prandtl-layer.
[667]	196
	197	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
	198	zu(0) = 0.0
	199	! zu(0) = - dz * 0.5
	200	ELSE
	201	zu(0) = - dz * 0.5
	202	ENDIF
[94]	203	zu(1) = dz * 0.5
[1]	204
[94]	205	dz_stretch_level_index = nzt+1
	206	dz_stretched = dz
	207	DO k = 2, nzt+1
	208	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	209	dz_stretched = dz_stretched * dz_stretch_factor
	210	dz_stretched = MIN( dz_stretched, dz_max )
	211	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	212	ENDIF
	213	zu(k) = zu(k-1) + dz_stretched
	214	ENDDO
[1]	215
	216	!
[94]	217	!-- Compute the w-levels. They are always staggered half-way between the
[843]	218	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	219	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	220	!-- The top w-level is extrapolated linearly.
[94]	221	zw(0) = 0.0
	222	DO k = 1, nzt
	223	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	224	ENDDO
	225	zw(nzt+1) = zw(nzt) + 2.0 * ( zu(nzt+1) - zw(nzt) )
[1]	226
[94]	227	ELSE
[1]	228	!
[843]	229	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	230	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	231	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	232	!-- w-level are defined at same height, but staggered from the second level.
	233	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[94]	234	zu(nzt+1) = dz * 0.5
	235	zu(nzt) = - dz * 0.5
	236
	237	dz_stretch_level_index = 0
	238	dz_stretched = dz
	239	DO k = nzt-1, 0, -1
	240	IF ( dz_stretch_level <= ABS( zu(k+1) ) .AND. &
	241	dz_stretched < dz_max ) THEN
	242	dz_stretched = dz_stretched * dz_stretch_factor
	243	dz_stretched = MIN( dz_stretched, dz_max )
	244	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	245	ENDIF
	246	zu(k) = zu(k+1) - dz_stretched
	247	ENDDO
	248
	249	!
	250	!-- Compute the w-levels. They are always staggered half-way between the
[843]	251	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	252	!-- at the ground. In this case the first u- and w-level are defined at
	253	!-- same height. The top w-level (nzt+1) is not used but set for
	254	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	255	zw(nzt+1) = dz
	256	zw(nzt) = 0.0
	257	DO k = 0, nzt
	258	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	259	ENDDO
	260
[843]	261	!
	262	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	263	!-- at same height.
	264	IF ( ibc_uv_b == 0 ) THEN
	265	zu(0) = zw(0)
	266	ENDIF
	267
[94]	268	ENDIF
	269
	270	!
[1]	271	!-- Compute grid lengths.
	272	DO k = 1, nzt+1
	273	dzu(k) = zu(k) - zu(k-1)
	274	ddzu(k) = 1.0 / dzu(k)
	275	dzw(k) = zw(k) - zw(k-1)
	276	ddzw(k) = 1.0 / dzw(k)
	277	ENDDO
	278
	279	DO k = 1, nzt
	280	dd2zu(k) = 1.0 / ( dzu(k) + dzu(k+1) )
	281	ENDDO
[667]	282
	283	!
[709]	284	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	285	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	286	!-- is only dz/2, but should be dz. Therefore, an additional array
	287	!-- containing with appropriate grid information is created for these
	288	!-- solvers.
	289	IF ( psolver /= 'multigrid' ) THEN
[667]	290	ALLOCATE( ddzu_pres(1:nzt+1) )
	291	ddzu_pres = ddzu
[864]	292	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	293	ENDIF
[1]	294
	295	!
	296	!-- In case of multigrid method, compute grid lengths and grid factors for the
	297	!-- grid levels
	298	IF ( psolver == 'multigrid' ) THEN
	299
	300	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	301	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	302	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	303	f1_mg(nzb+1:nzt,maximum_grid_level), &
	304	f2_mg(nzb+1:nzt,maximum_grid_level), &
	305	f3_mg(nzb+1:nzt,maximum_grid_level) )
	306
	307	dzu_mg(:,maximum_grid_level) = dzu
[667]	308	!
[864]	309	!-- Next line to ensure an equally spaced grid.
	310	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	311
[1]	312	dzw_mg(:,maximum_grid_level) = dzw
	313	nzt_l = nzt
	314	DO l = maximum_grid_level-1, 1, -1
	315	dzu_mg(nzb+1,l) = 2.0 * dzu_mg(nzb+1,l+1)
	316	dzw_mg(nzb+1,l) = 2.0 * dzw_mg(nzb+1,l+1)
	317	nzt_l = nzt_l / 2
	318	DO k = 2, nzt_l+1
	319	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	320	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	321	ENDDO
	322	ENDDO
	323
	324	nzt_l = nzt
	325	dx_l = dx
	326	dy_l = dy
	327	DO l = maximum_grid_level, 1, -1
	328	ddx2_mg(l) = 1.0 / dx_l**2
	329	ddy2_mg(l) = 1.0 / dy_l**2
	330	DO k = nzb+1, nzt_l
	331	f2_mg(k,l) = 1.0 / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	332	f3_mg(k,l) = 1.0 / ( dzu_mg(k,l) * dzw_mg(k,l) )
	333	f1_mg(k,l) = 2.0 * ( ddx2_mg(l) + ddy2_mg(l) ) + &
	334	f2_mg(k,l) + f3_mg(k,l)
	335	ENDDO
	336	nzt_l = nzt_l / 2
	337	dx_l = dx_l * 2.0
	338	dy_l = dy_l * 2.0
	339	ENDDO
	340
	341	ENDIF
	342
	343	!
	344	!-- Compute the reciprocal values of the horizontal grid lengths.
	345	ddx = 1.0 / dx
	346	ddy = 1.0 / dy
	347	dx2 = dx * dx
	348	dy2 = dy * dy
	349	ddx2 = 1.0 / dx2
	350	ddy2 = 1.0 / dy2
	351
	352	!
	353	!-- Compute the grid-dependent mixing length.
	354	DO k = 1, nzt
	355	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333
	356	ENDDO
	357
	358	!
	359	!-- Allocate outer and inner index arrays for topography and set
[114]	360	!-- defaults.
	361	!-- nzb_local has to contain additional layers of ghost points for calculating
	362	!-- the flag arrays needed for the multigrid method
	363	gls = 2**( maximum_grid_level )
[861]	364	IF ( gls < nbgp ) gls = nbgp
[667]	365
[114]	366	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	367	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	368	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	369	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	370	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	371	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	372	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	373	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	374	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	375	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	376	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	377	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	378	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	379	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	380	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	381	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	382	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	383	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	384	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	385	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	386	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	387	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	388	nzb_2d(nysg:nyng,nxlg:nxrg), &
	389	wall_e_x(nysg:nyng,nxlg:nxrg), &
	390	wall_e_y(nysg:nyng,nxlg:nxrg), &
	391	wall_u(nysg:nyng,nxlg:nxrg), &
	392	wall_v(nysg:nyng,nxlg:nxrg), &
	393	wall_w_x(nysg:nyng,nxlg:nxrg), &
	394	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	395
	396
[667]	397
	398	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	399
[818]	400
[1]	401	nzb_s_inner = nzb; nzb_s_outer = nzb
	402	nzb_u_inner = nzb; nzb_u_outer = nzb
	403	nzb_v_inner = nzb; nzb_v_outer = nzb
	404	nzb_w_inner = nzb; nzb_w_outer = nzb
	405
	406	!
[19]	407	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	408	!-- form (which does not use surface fluxes) is applied
	409	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	410	nzb_diff = nzb + 2
	411	ELSE
	412	nzb_diff = nzb + 1
	413	ENDIF
[19]	414	IF ( use_top_fluxes ) THEN
	415	nzt_diff = nzt - 1
	416	ELSE
	417	nzt_diff = nzt
	418	ENDIF
[1]	419
	420	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	421	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	422
	423	wall_e_x = 0.0; wall_e_y = 0.0; wall_u = 0.0; wall_v = 0.0
	424	wall_w_x = 0.0; wall_w_y = 0.0
	425	fwxp = 1.0; fwxm = 1.0; fwyp = 1.0; fwym = 1.0
	426	fxp = 1.0; fxm = 1.0; fyp = 1.0; fym = 1.0
	427
	428	!
	429	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	430	!-- for the moment,
	431	!-- multiplication with wall_adjustment_factor near the end of this routine
	432	l_wall(nzb,:,:) = l_grid(1)
	433	DO k = nzb+1, nzt
	434	l_wall(k,:,:) = l_grid(k)
	435	ENDDO
	436	l_wall(nzt+1,:,:) = l_grid(nzt)
	437
	438	ALLOCATE ( vertical_influence(nzb:nzt) )
	439	DO k = 1, nzt
	440	vertical_influence(k) = MIN ( INT( l_grid(k) / &
	441	( wall_adjustment_factor * dzw(k) ) + 0.5 ), nzt - k )
	442	ENDDO
	443
	444	DO k = 1, MAXVAL( nzb_s_inner )
	445	IF ( l_grid(k) > 1.5 * dx * wall_adjustment_factor .OR. &
	446	l_grid(k) > 1.5 * dy * wall_adjustment_factor ) THEN
[254]	447	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	448	'threshold given by only local', &
	449	' &horizontal reduction of near_wall ', &
	450	'mixing length l_wall', &
	451	' &starting from height level k = ', k, '.'
	452	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	453	EXIT
	454	ENDIF
	455	ENDDO
	456	vertical_influence(0) = vertical_influence(1)
	457
[667]	458	DO i = nxlg, nxrg
	459	DO j = nysg, nyng
[1]	460	DO k = nzb_s_inner(j,i) + 1, &
	461	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	462	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	463	ENDDO
	464	ENDDO
	465	ENDDO
	466
	467	!
	468	!-- Set outer and inner index arrays for non-flat topography.
	469	!-- Here consistency checks concerning domain size and periodicity are
	470	!-- necessary.
	471	!-- Within this SELECT CASE structure only nzb_local is initialized
	472	!-- individually depending on the chosen topography type, all other index
	473	!-- arrays are initialized further below.
	474	SELECT CASE ( TRIM( topography ) )
	475
	476	CASE ( 'flat' )
	477	!
[555]	478	!-- nzb_local is required for the multigrid solver
	479	nzb_local = 0
[1]	480
	481	CASE ( 'single_building' )
	482	!
	483	!-- Single rectangular building, by default centered in the middle of the
	484	!-- total domain
	485	blx = NINT( building_length_x / dx )
	486	bly = NINT( building_length_y / dy )
	487	bh = NINT( building_height / dz )
	488
	489	IF ( building_wall_left == 9999999.9 ) THEN
	490	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	491	ENDIF
	492	bxl = NINT( building_wall_left / dx )
	493	bxr = bxl + blx
	494
	495	IF ( building_wall_south == 9999999.9 ) THEN
	496	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	497	ENDIF
	498	bys = NINT( building_wall_south / dy )
	499	byn = bys + bly
	500
	501	!
	502	!-- Building size has to meet some requirements
	503	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	504	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	505	WRITE( message_string, * ) 'inconsistent building parameters:', &
	506	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	507	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	508	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	509	ENDIF
	510
	511	!
[217]	512	!-- Define the building.
[1]	513	nzb_local = 0
[134]	514	nzb_local(bys:byn,bxl:bxr) = bh
[1]	515
[240]	516	CASE ( 'single_street_canyon' )
	517	!
	518	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	519	!-- The canyon is centered in the other direction by default.
	520	IF ( canyon_width_x /= 9999999.9 ) THEN
	521	!
	522	!-- Street canyon in y direction
	523	cwx = NINT( canyon_width_x / dx )
	524	IF ( canyon_wall_left == 9999999.9 ) THEN
	525	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	526	ENDIF
	527	cxl = NINT( canyon_wall_left / dx )
	528	cxr = cxl + cwx
	529
	530	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	531	!
	532	!-- Street canyon in x direction
	533	cwy = NINT( canyon_width_y / dy )
	534	IF ( canyon_wall_south == 9999999.9 ) THEN
	535	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	536	ENDIF
	537	cys = NINT( canyon_wall_south / dy )
	538	cyn = cys + cwy
	539
	540	ELSE
[254]	541
	542	message_string = 'no street canyon width given'
	543	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	544
[240]	545	ENDIF
	546
	547	ch = NINT( canyon_height / dz )
	548	dp_level_ind_b = ch
	549	!
	550	!-- Street canyon size has to meet some requirements
	551	IF ( canyon_width_x /= 9999999.9 ) THEN
	552	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
	553	( ch < 3 ) ) THEN
[254]	554	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	555	'&cxl=', cxl, 'cxr=', cxr, &
	556	'cwx=', cwx, &
[254]	557	'ch=', ch, 'nx=', nx, 'ny=', ny
	558	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	559	ENDIF
	560	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	561	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
	562	( ch < 3 ) ) THEN
[254]	563	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	564	'&cys=', cys, 'cyn=', cyn, &
	565	'cwy=', cwy, &
[254]	566	'ch=', ch, 'nx=', nx, 'ny=', ny
	567	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	568	ENDIF
	569	ENDIF
[274]	570	IF ( canyon_width_x /= 9999999.9 .AND. canyon_width_y /= 9999999.9 ) &
[240]	571	THEN
[274]	572	message_string = 'inconsistent canyon parameters:' // &
[254]	573	'&street canyon can only be oriented' // &
	574	'&either in x- or in y-direction'
	575	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	576	ENDIF
	577
	578	nzb_local = ch
	579	IF ( canyon_width_x /= 9999999.9 ) THEN
	580	nzb_local(:,cxl+1:cxr-1) = 0
	581	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	582	nzb_local(cys+1:cyn-1,:) = 0
	583	ENDIF
	584
[1]	585	CASE ( 'read_from_file' )
[759]	586
[818]	587	ALLOCATE ( topo_height(0:ny,0:nx) )
	588
[759]	589	DO ii = 0, io_blocks-1
	590	IF ( ii == io_group ) THEN
	591
[1]	592	!
[759]	593	!-- Arbitrary irregular topography data in PALM format (exactly
	594	!-- matching the grid size and total domain size)
[1069]	595	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	596	FORM='FORMATTED', ERR=10 )
	597	DO j = ny, 0, -1
	598	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	599	ENDDO
	600
	601	GOTO 12
	602
[1069]	603	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	604	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	605
[1069]	606	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	607	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	608
	609	12 CLOSE( 90 )
	610
	611	ENDIF
[809]	612	#if defined( __parallel ) && ! defined ( __check )
[759]	613	CALL MPI_BARRIER( comm2d, ierr )
	614	#endif
[559]	615	ENDDO
[759]	616
[1]	617	!
	618	!-- Calculate the index height of the topography
	619	DO i = 0, nx
	620	DO j = 0, ny
	621	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
	622	ENDDO
	623	ENDDO
[818]	624
	625	DEALLOCATE ( topo_height )
[114]	626	!
[759]	627	!-- Add cyclic boundaries (additional layers are for calculating
	628	!-- flag arrays needed for the multigrid sover)
[114]	629	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	630	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	631	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	632	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	633
[1]	634	CASE DEFAULT
	635	!
	636	!-- The DEFAULT case is reached either if the parameter topography
[217]	637	!-- contains a wrong character string or if the user has defined a special
[1]	638	!-- case in the user interface. There, the subroutine user_init_grid
	639	!-- checks which of these two conditions applies.
[114]	640	CALL user_init_grid( gls, nzb_local )
[1]	641
	642	END SELECT
	643	!
[861]	644	!-- Determine the maximum level of topography. Furthermore it is used for
	645	!-- steering the degradation of order of the applied advection scheme.
[978]	646	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	647	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[861]	648	nzb_max = MAXVAL( nzb_local )
[978]	649	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
	650	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	651	nzb_max = nzt
	652	ENDIF
	653
[861]	654	!
[1]	655	!-- Consistency checks and index array initialization are only required for
[217]	656	!-- non-flat topography, also the initialization of topography height arrays
[49]	657	!-- zu_s_inner and zw_w_inner
[1]	658	IF ( TRIM( topography ) /= 'flat' ) THEN
	659
	660	!
	661	!-- Consistency checks
	662	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[274]	663	WRITE( message_string, * ) 'nzb_local values are outside the', &
	664	'model domain', &
	665	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
	666	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	667	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	668	ENDIF
	669
[722]	670	IF ( bc_lr == 'cyclic' ) THEN
[1]	671	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
	672	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[254]	673	message_string = 'nzb_local does not fulfill cyclic' // &
	674	' boundary condition in x-direction'
	675	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	676	ENDIF
	677	ENDIF
[722]	678	IF ( bc_ns == 'cyclic' ) THEN
[1]	679	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
	680	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[254]	681	message_string = 'nzb_local does not fulfill cyclic' // &
	682	' boundary condition in y-direction'
	683	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	684	ENDIF
	685	ENDIF
	686
[217]	687	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	688	!
[217]	689	!-- The array nzb_local as defined using the 'cell_edge' convention
	690	!-- describes the actual total size of topography which is defined at the
	691	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	692	!-- on the topography walls in y-direction. However, PALM uses individual
	693	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	694	!-- Therefore, the extent of topography in nzb_local is now reduced by
	695	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	696	!-- to form the basis for nzb_s_inner.
	697	DO j = -gls, ny + gls
	698	DO i = -gls, nx
	699	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	700	ENDDO
[134]	701	ENDDO
[217]	702	!-- apply cyclic boundary conditions in x-direction
	703	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	704	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	705	DO i = -gls, nx + gls
	706	DO j = -gls, ny
	707	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	708	ENDDO
[134]	709	ENDDO
[217]	710	!-- apply cyclic boundary conditions in y-direction
	711	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	712	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	713	ENDIF
[134]	714
[1]	715	!
	716	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	717	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	718	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	719
	720	!
	721	!-- Initialize remaining index arrays:
	722	!-- first pre-initialize them with nzb_s_inner...
	723	nzb_u_inner = nzb_s_inner
	724	nzb_u_outer = nzb_s_inner
	725	nzb_v_inner = nzb_s_inner
	726	nzb_v_outer = nzb_s_inner
	727	nzb_w_outer = nzb_s_inner
	728	nzb_s_outer = nzb_s_inner
	729
	730	!
	731	!-- ...then extend pre-initialized arrays in their according directions
	732	!-- based on nzb_local using nzb_tmp as a temporary global index array
	733
	734	!
	735	!-- nzb_s_outer:
	736	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	737	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	738	DO j = -1, ny + 1
	739	DO i = 0, nx
	740	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
	741	nzb_local(j,i+1) )
	742	ENDDO
	743	ENDDO
	744	DO i = nxl, nxr
	745	DO j = nys, nyn
	746	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	747	nzb_tmp(j+1,i) )
	748	ENDDO
	749	!
	750	!-- non-cyclic boundary conditions (overwritten by call of
	751	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	752	IF ( nys == 0 ) THEN
	753	j = -1
	754	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	755	ENDIF
	756	IF ( nys == ny ) THEN
	757	j = ny + 1
	758	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	759	ENDIF
	760	ENDDO
	761	!
	762	!-- nzb_w_outer:
	763	!-- identical to nzb_s_outer
	764	nzb_w_outer = nzb_s_outer
	765
	766	!
	767	!-- nzb_u_inner:
	768	!-- extend nzb_local rightwards only
[667]	769	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	770	DO j = -1, ny + 1
	771	DO i = 0, nx + 1
	772	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	773	ENDDO
	774	ENDDO
[667]	775	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	776
	777	!
	778	!-- nzb_u_outer:
	779	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	780	DO i = nxl, nxr
	781	DO j = nys, nyn
	782	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	783	nzb_tmp(j+1,i) )
	784	ENDDO
	785	!
	786	!-- non-cyclic boundary conditions (overwritten by call of
	787	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	788	IF ( nys == 0 ) THEN
	789	j = -1
	790	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	791	ENDIF
	792	IF ( nys == ny ) THEN
	793	j = ny + 1
	794	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	795	ENDIF
	796	ENDDO
	797
	798	!
	799	!-- nzb_v_inner:
	800	!-- extend nzb_local northwards only
[667]	801	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	802	DO i = -1, nx + 1
	803	DO j = 0, ny + 1
	804	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	805	ENDDO
	806	ENDDO
[667]	807	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	808
	809	!
	810	!-- nzb_v_outer:
	811	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	812	DO j = nys, nyn
	813	DO i = nxl, nxr
	814	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
	815	nzb_tmp(j,i+1) )
	816	ENDDO
	817	!
	818	!-- non-cyclic boundary conditions (overwritten by call of
	819	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	820	IF ( nxl == 0 ) THEN
	821	i = -1
	822	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	823	ENDIF
	824	IF ( nxr == nx ) THEN
	825	i = nx + 1
	826	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	827	ENDIF
	828	ENDDO
[809]	829	#if ! defined ( __check )
[1]	830	!
	831	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	832	!-- boundary conditions, if applicable.
	833	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	834	!-- they do not require exchange and are not included here.
	835	CALL exchange_horiz_2d_int( nzb_u_inner )
	836	CALL exchange_horiz_2d_int( nzb_u_outer )
	837	CALL exchange_horiz_2d_int( nzb_v_inner )
	838	CALL exchange_horiz_2d_int( nzb_v_outer )
	839	CALL exchange_horiz_2d_int( nzb_w_outer )
	840	CALL exchange_horiz_2d_int( nzb_s_outer )
	841
[49]	842	!
	843	!-- Allocate and set the arrays containing the topography height
	844	IF ( myid == 0 ) THEN
	845
	846	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	847
	848	DO i = 0, nx + 1
	849	DO j = 0, ny + 1
	850	zu_s_inner(i,j) = zu(nzb_local(j,i))
	851	zw_w_inner(i,j) = zw(nzb_local(j,i))
	852	ENDDO
	853	ENDDO
	854
	855	ENDIF
[807]	856	#endif
[1]	857	ENDIF
	858
[809]	859	#if ! defined ( __check )
[1]	860	!
	861	!-- Preliminary: to be removed after completion of the topography code!
	862	!-- Set the former default k index arrays nzb_2d
	863	nzb_2d = nzb
	864
	865	!
	866	!-- Set the individual index arrays which define the k index from which on
	867	!-- the usual finite difference form (which does not use surface fluxes) is
	868	!-- applied
	869	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	870	nzb_diff_u = nzb_u_inner + 2
	871	nzb_diff_v = nzb_v_inner + 2
	872	nzb_diff_s_inner = nzb_s_inner + 2
	873	nzb_diff_s_outer = nzb_s_outer + 2
	874	ELSE
	875	nzb_diff_u = nzb_u_inner + 1
	876	nzb_diff_v = nzb_v_inner + 1
	877	nzb_diff_s_inner = nzb_s_inner + 1
	878	nzb_diff_s_outer = nzb_s_outer + 1
	879	ENDIF
	880
	881	!
	882	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	883	!-- for limitation of near-wall mixing length l_wall further below
	884	corner_nl = 0
	885	corner_nr = 0
	886	corner_sl = 0
	887	corner_sr = 0
	888	wall_l = 0
	889	wall_n = 0
	890	wall_r = 0
	891	wall_s = 0
	892
	893	DO i = nxl, nxr
	894	DO j = nys, nyn
	895	!
	896	!-- u-component
	897	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
	898	wall_u(j,i) = 1.0 ! north wall (location of adjacent fluid)
	899	fym(j,i) = 0.0
	900	fyp(j,i) = 1.0
	901	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
	902	wall_u(j,i) = 1.0 ! south wall (location of adjacent fluid)
	903	fym(j,i) = 1.0
	904	fyp(j,i) = 0.0
	905	ENDIF
	906	!
	907	!-- v-component
	908	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
	909	wall_v(j,i) = 1.0 ! rigth wall (location of adjacent fluid)
	910	fxm(j,i) = 0.0
	911	fxp(j,i) = 1.0
	912	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
	913	wall_v(j,i) = 1.0 ! left wall (location of adjacent fluid)
	914	fxm(j,i) = 1.0
	915	fxp(j,i) = 0.0
	916	ENDIF
	917	!
	918	!-- w-component, also used for scalars, separate arrays for shear
	919	!-- production of tke
	920	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
	921	wall_e_y(j,i) = 1.0 ! north wall (location of adjacent fluid)
	922	wall_w_y(j,i) = 1.0
	923	fwym(j,i) = 0.0
	924	fwyp(j,i) = 1.0
	925	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
	926	wall_e_y(j,i) = -1.0 ! south wall (location of adjacent fluid)
	927	wall_w_y(j,i) = 1.0
	928	fwym(j,i) = 1.0
	929	fwyp(j,i) = 0.0
	930	ENDIF
	931	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
	932	wall_e_x(j,i) = 1.0 ! right wall (location of adjacent fluid)
	933	wall_w_x(j,i) = 1.0
	934	fwxm(j,i) = 0.0
	935	fwxp(j,i) = 1.0
	936	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
	937	wall_e_x(j,i) = -1.0 ! left wall (location of adjacent fluid)
	938	wall_w_x(j,i) = 1.0
	939	fwxm(j,i) = 1.0
	940	fwxp(j,i) = 0.0
	941	ENDIF
	942	!
	943	!-- Wall and corner locations inside buildings for limitation of
	944	!-- near-wall mixing length l_wall
	945	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	946
	947	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	948
	949	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	950	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	951	nzb_s_inner(j,i-1) ) + 1
	952	ENDIF
	953
	954	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	955	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	956	nzb_s_inner(j,i+1) ) + 1
	957	ENDIF
	958
	959	ENDIF
	960
	961	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	962
	963	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	964	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	965	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	966	nzb_s_inner(j,i-1) ) + 1
	967	ENDIF
	968
	969	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	970	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	971	nzb_s_inner(j,i+1) ) + 1
	972	ENDIF
	973
	974	ENDIF
	975
	976	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	977	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	978	ENDIF
	979
	980	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	981	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	982	ENDIF
	983
	984	ENDDO
	985	ENDDO
	986
	987	!
[114]	988	!-- Calculate wall flag arrays for the multigrid method
	989	IF ( psolver == 'multigrid' ) THEN
	990	!
	991	!-- Gridpoint increment of the current level
	992	inc = 1
	993
	994	DO l = maximum_grid_level, 1 , -1
	995
	996	nxl_l = nxl_mg(l)
	997	nxr_l = nxr_mg(l)
	998	nys_l = nys_mg(l)
	999	nyn_l = nyn_mg(l)
	1000	nzt_l = nzt_mg(l)
	1001
	1002	!
	1003	!-- Assign the flag level to be calculated
	1004	SELECT CASE ( l )
	1005	CASE ( 1 )
	1006	flags => wall_flags_1
	1007	CASE ( 2 )
	1008	flags => wall_flags_2
	1009	CASE ( 3 )
	1010	flags => wall_flags_3
	1011	CASE ( 4 )
	1012	flags => wall_flags_4
	1013	CASE ( 5 )
	1014	flags => wall_flags_5
	1015	CASE ( 6 )
	1016	flags => wall_flags_6
	1017	CASE ( 7 )
	1018	flags => wall_flags_7
	1019	CASE ( 8 )
	1020	flags => wall_flags_8
	1021	CASE ( 9 )
	1022	flags => wall_flags_9
	1023	CASE ( 10 )
	1024	flags => wall_flags_10
	1025	END SELECT
	1026
	1027	!
	1028	!-- Depending on the grid level, set the respective bits in case of
	1029	!-- neighbouring walls
	1030	!-- Bit 0: wall to the bottom
	1031	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1032	!-- Bit 2: wall to the south
	1033	!-- Bit 3: wall to the north
	1034	!-- Bit 4: wall to the left
	1035	!-- Bit 5: wall to the right
[116]	1036	!-- Bit 6: inside building
[114]	1037
	1038	flags = 0
	1039
[927]	1040	!
	1041	!-- In case of masking method, flags are not set and multigrid method
	1042	!-- works like FFT-solver
	1043	IF ( .NOT. masking_method ) THEN
	1044
	1045	DO i = nxl_l-1, nxr_l+1
	1046	DO j = nys_l-1, nyn_l+1
	1047	DO k = nzb, nzt_l+1
[114]	1048
	1049	!
[927]	1050	!-- Inside/outside building (inside building does not need
	1051	!-- further tests for walls)
	1052	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1053
[927]	1054	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1055
[927]	1056	ELSE
[114]	1057	!
[927]	1058	!-- Bottom wall
	1059	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1060	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1061	ENDIF
[114]	1062	!
[927]	1063	!-- South wall
	1064	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1065	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1066	ENDIF
[114]	1067	!
[927]	1068	!-- North wall
	1069	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1070	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1071	ENDIF
[114]	1072	!
[927]	1073	!-- Left wall
	1074	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1075	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1076	ENDIF
[114]	1077	!
[927]	1078	!-- Right wall
	1079	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1080	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1081	ENDIF
	1082
[114]	1083	ENDIF
	1084
[927]	1085	ENDDO
[114]	1086	ENDDO
	1087	ENDDO
	1088
[927]	1089	ENDIF
	1090
[114]	1091	!
	1092	!-- Test output of flag arrays
[145]	1093	! i = nxl_l
	1094	! WRITE (9,*) ' '
	1095	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1096	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1097	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1098	! DO k = nzt_l+1, nzb, -1
	1099	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1100	! ENDDO
[114]	1101
	1102	inc = inc * 2
	1103
	1104	ENDDO
	1105
	1106	ENDIF
[861]	1107	!
	1108	!-- Allocate flags needed for masking walls.
	1109	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr) )
	1110	wall_flags_0 = 0
[114]	1111
[861]	1112	IF ( scalar_advec == 'ws-scheme' ) THEN
[114]	1113	!
[861]	1114	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1115	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1116	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1117	!-- grid points.
	1118	DO i = nxl, nxr
	1119	DO j = nys, nyn
	1120	DO k = nzb_s_inner(j,i)+1, nzt
	1121	!
	1122	!-- scalar - x-direction
	1123	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1124	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1125	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1126	.AND. i == nxr ) ) THEN
[861]	1127	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1128	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1129	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1130	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1131	) THEN
[861]	1132	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1133	ELSE
	1134	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1135	ENDIF
	1136	!
	1137	!-- scalar - y-direction
	1138	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1139	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1140	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1141	.AND. j == nyn ) ) THEN
[861]	1142	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1143	!-- WS3
	1144	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1145	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1146	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1147	) THEN
[861]	1148	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1149	!-- WS5
	1150	ELSE
	1151	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1152	ENDIF
	1153	!
	1154	!-- scalar - z-direction
	1155	!-- WS1 (6), WS3 (7), WS5 (8)
	1156	flag_set = .FALSE.
	1157	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1158	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1159	flag_set = .TRUE.
	1160	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1161	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1162	flag_set = .TRUE.
	1163	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1164	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1165	ENDIF
	1166	ENDDO
	1167	ENDDO
	1168	ENDDO
	1169	ENDIF
	1170
	1171	IF ( momentum_advec == 'ws-scheme' ) THEN
	1172	!
	1173	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1174	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1175	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1176	!-- grid points.
	1177	DO i = nxl, nxr
	1178	DO j = nys, nyn
	1179	DO k = nzb_u_inner(j,i)+1, nzt
	1180	!
	1181	!-- u component - x-direction
	1182	!-- WS1 (9), WS3 (10), WS5 (11)
	1183	IF ( k <= nzb_u_inner(j,i+1) &
[978]	1184	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1185	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1186	) THEN
[861]	1187	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1188	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1189	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1190	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1191	) THEN
[861]	1192	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
	1193	ELSE
	1194	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
	1195	ENDIF
[978]	1196
[861]	1197	!
	1198	!-- u component - y-direction
	1199	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1200	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1201	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1202	.AND. j == nyn ) ) THEN
[861]	1203	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1204	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1205	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1206	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1207	) THEN
[861]	1208	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
	1209	ELSE
	1210	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
	1211	ENDIF
	1212	!
	1213	!-- u component - z-direction
	1214	!-- WS1 (15), WS3 (16), WS5 (17)
	1215	flag_set = .FALSE.
	1216	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1217	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1218	flag_set = .TRUE.
	1219	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1220	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1221	flag_set = .TRUE.
	1222	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1223	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1224	ENDIF
	1225
	1226	ENDDO
	1227	ENDDO
	1228	ENDDO
	1229
	1230	DO i = nxl, nxr
	1231	DO j = nys, nyn
	1232	DO k = nzb_v_inner(j,i)+1, nzt
	1233	!
	1234	!-- v component - x-direction
	1235	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1236	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1237	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1238	.AND. i == nxr ) ) THEN
[861]	1239	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1240	!-- WS3
	1241	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1242	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1243	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1244	) THEN
[861]	1245	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
	1246	ELSE
	1247	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
	1248	ENDIF
	1249	!
	1250	!-- v component - y-direction
	1251	!-- WS1 (21), WS3 (22), WS5 (23)
	1252	IF ( k <= nzb_v_inner(j+1,i) &
[978]	1253	.OR. ( ( inflow_s .OR. outflow_s ) .AND. i == nysv ) &
	1254	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1255	) THEN
[861]	1256	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1257	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1258	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1259	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1260	) THEN
[861]	1261	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
	1262	ELSE
	1263	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
	1264	ENDIF
	1265	!
	1266	!-- v component - z-direction
	1267	!-- WS1 (24), WS3 (25), WS5 (26)
	1268	flag_set = .FALSE.
	1269	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1270	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1271	flag_set = .TRUE.
	1272	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1273	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1274	flag_set = .TRUE.
	1275	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1276	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1277	ENDIF
	1278
	1279	ENDDO
	1280	ENDDO
	1281	ENDDO
	1282	DO i = nxl, nxr
	1283	DO j = nys, nyn
[1015]	1284	DO k = nzb_w_inner(j,i), nzt
[861]	1285	!
	1286	!-- w component - x-direction
	1287	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1288	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1289	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1290	.AND. i == nxr ) ) THEN
[861]	1291	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1292	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1293	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1294	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1295	) THEN
[861]	1296	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
	1297	ELSE
	1298	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
	1299	ENDIF
	1300	!
	1301	!-- w component - y-direction
	1302	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1303	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1304	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1305	.AND. j == nyn ) ) THEN
[861]	1306	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1307	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1308	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1309	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1310	) THEN
[861]	1311	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
	1312	ELSE
	1313	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 32 )
	1314	ENDIF
	1315	!
	1316	!-- w component - z-direction
	1317	!-- WS1 (33), WS3 (34), WS5 (35)
	1318	flag_set = .FALSE.
	1319	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1320	.OR. k == nzt ) THEN
	1321	!
	1322	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1323	!-- set, although this is not a prognostic level. However,
	1324	!-- contrary to the advection of u,v and s this is necessary
	1325	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1326	!-- at k == nzb_w_inner(j,i)+1.
	1327	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 33 )
	1328	flag_set = .TRUE.
	1329	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1330	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 34 )
	1331	flag_set = .TRUE.
	1332	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
	1333	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 35 )
	1334	ENDIF
	1335
	1336	ENDDO
	1337	ENDDO
	1338	ENDDO
	1339
	1340	ENDIF
	1341
	1342	!
[1]	1343	!-- In case of topography: limit near-wall mixing length l_wall further:
	1344	!-- Go through all points of the subdomain one by one and look for the closest
	1345	!-- surface
	1346	IF ( TRIM(topography) /= 'flat' ) THEN
	1347	DO i = nxl, nxr
	1348	DO j = nys, nyn
	1349
	1350	nzb_si = nzb_s_inner(j,i)
	1351	vi = vertical_influence(nzb_si)
	1352
	1353	IF ( wall_n(j,i) > 0 ) THEN
	1354	!
	1355	!-- North wall (y distance)
	1356	DO k = wall_n(j,i), nzb_si
	1357	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5 * dy )
	1358	ENDDO
	1359	!
	1360	!-- Above North wall (yz distance)
	1361	DO k = nzb_si + 1, nzb_si + vi
	1362	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1363	SQRT( 0.25 * dy**2 + &
	1364	( zu(k) - zw(nzb_si) )**2 ) )
	1365	ENDDO
	1366	!
	1367	!-- Northleft corner (xy distance)
	1368	IF ( corner_nl(j,i) > 0 ) THEN
	1369	DO k = corner_nl(j,i), nzb_si
	1370	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1371	0.5 * SQRT( dx2 + dy2 ) )
	1372	ENDDO
	1373	!
	1374	!-- Above Northleft corner (xyz distance)
	1375	DO k = nzb_si + 1, nzb_si + vi
	1376	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1377	SQRT( 0.25 * (dx2 + dy2) + &
	1378	( zu(k) - zw(nzb_si) )**2 ) )
	1379	ENDDO
	1380	ENDIF
	1381	!
	1382	!-- Northright corner (xy distance)
	1383	IF ( corner_nr(j,i) > 0 ) THEN
	1384	DO k = corner_nr(j,i), nzb_si
	1385	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1386	0.5 * SQRT( dx2 + dy2 ) )
	1387	ENDDO
	1388	!
	1389	!-- Above northright corner (xyz distance)
	1390	DO k = nzb_si + 1, nzb_si + vi
	1391	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1392	SQRT( 0.25 * (dx2 + dy2) + &
	1393	( zu(k) - zw(nzb_si) )**2 ) )
	1394	ENDDO
	1395	ENDIF
	1396	ENDIF
	1397
	1398	IF ( wall_s(j,i) > 0 ) THEN
	1399	!
	1400	!-- South wall (y distance)
	1401	DO k = wall_s(j,i), nzb_si
	1402	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5 * dy )
	1403	ENDDO
	1404	!
	1405	!-- Above south wall (yz distance)
	1406	DO k = nzb_si + 1, &
	1407	nzb_si + vi
	1408	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1409	SQRT( 0.25 * dy**2 + &
	1410	( zu(k) - zw(nzb_si) )**2 ) )
	1411	ENDDO
	1412	!
	1413	!-- Southleft corner (xy distance)
	1414	IF ( corner_sl(j,i) > 0 ) THEN
	1415	DO k = corner_sl(j,i), nzb_si
	1416	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1417	0.5 * SQRT( dx2 + dy2 ) )
	1418	ENDDO
	1419	!
	1420	!-- Above southleft corner (xyz distance)
	1421	DO k = nzb_si + 1, nzb_si + vi
	1422	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1423	SQRT( 0.25 * (dx2 + dy2) + &
	1424	( zu(k) - zw(nzb_si) )**2 ) )
	1425	ENDDO
	1426	ENDIF
	1427	!
	1428	!-- Southright corner (xy distance)
	1429	IF ( corner_sr(j,i) > 0 ) THEN
	1430	DO k = corner_sr(j,i), nzb_si
	1431	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1432	0.5 * SQRT( dx2 + dy2 ) )
	1433	ENDDO
	1434	!
	1435	!-- Above southright corner (xyz distance)
	1436	DO k = nzb_si + 1, nzb_si + vi
	1437	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1438	SQRT( 0.25 * (dx2 + dy2) + &
	1439	( zu(k) - zw(nzb_si) )**2 ) )
	1440	ENDDO
	1441	ENDIF
	1442
	1443	ENDIF
	1444
	1445	IF ( wall_l(j,i) > 0 ) THEN
	1446	!
	1447	!-- Left wall (x distance)
	1448	DO k = wall_l(j,i), nzb_si
	1449	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5 * dx )
	1450	ENDDO
	1451	!
	1452	!-- Above left wall (xz distance)
	1453	DO k = nzb_si + 1, nzb_si + vi
	1454	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1455	SQRT( 0.25 * dx**2 + &
	1456	( zu(k) - zw(nzb_si) )**2 ) )
	1457	ENDDO
	1458	ENDIF
	1459
	1460	IF ( wall_r(j,i) > 0 ) THEN
	1461	!
	1462	!-- Right wall (x distance)
	1463	DO k = wall_r(j,i), nzb_si
	1464	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5 * dx )
	1465	ENDDO
	1466	!
	1467	!-- Above right wall (xz distance)
	1468	DO k = nzb_si + 1, nzb_si + vi
	1469	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1470	SQRT( 0.25 * dx**2 + &
	1471	( zu(k) - zw(nzb_si) )**2 ) )
	1472	ENDDO
	1473
	1474	ENDIF
	1475
	1476	ENDDO
	1477	ENDDO
	1478
	1479	ENDIF
	1480
	1481	!
	1482	!-- Multiplication with wall_adjustment_factor
	1483	l_wall = wall_adjustment_factor * l_wall
	1484
	1485	!
[709]	1486	!-- Set lateral boundary conditions for l_wall
[667]	1487	CALL exchange_horiz( l_wall, nbgp )
	1488
[1]	1489	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1490	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1491
[807]	1492	#endif
[1]	1493
	1494	END SUBROUTINE init_grid

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