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source: palm/trunk/SOURCE/init_grid.f90 @ 1350

Last change on this file since 1350 was 1323, checked in by raasch, 11 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	!
[1310]	17	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	18	!--------------------------------------------------------------------------------!
	19	!
[254]	20	! Current revisions:
[1]	21	! -----------------
[1321]	22	!
[1323]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1323 2014-03-20 17:09:54Z maronga $
	27	!
[1323]	28	! 1322 2014-03-20 16:38:49Z raasch
	29	! REAL constants defined as wp-kind
	30	!
[1321]	31	! 1320 2014-03-20 08:40:49Z raasch
[1320]	32	! ONLY-attribute added to USE-statements,
	33	! kind-parameters added to all INTEGER and REAL declaration statements,
	34	! kinds are defined in new module kinds,
	35	! revision history before 2012 removed,
	36	! comment fields (!:) to be used for variable explanations added to
	37	! all variable declaration statements
[1321]	38	!
[1222]	39	! 1221 2013-09-10 08:59:13Z raasch
	40	! wall_flags_00 introduced to hold bits 32-63,
	41	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	42	! loops optimized for openACC (pres + flow_statistics)
	43	!
[1093]	44	! 1092 2013-02-02 11:24:22Z raasch
	45	! unused variables removed
	46	!
[1070]	47	! 1069 2012-11-28 16:18:43Z maronga
	48	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	49	! model in case of coupled runs
	50	!
[1037]	51	! 1036 2012-10-22 13:43:42Z raasch
	52	! code put under GPL (PALM 3.9)
	53	!
[1017]	54	! 1015 2012-09-27 09:23:24Z raasch
	55	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	56	! nzb_w_inner+1
	57	!
[997]	58	! 996 2012-09-07 10:41:47Z raasch
	59	! little reformatting
	60	!
[979]	61	! 978 2012-08-09 08:28:32Z fricke
	62	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	63	! Bugfix: Set wall_flags_0 for inflow boundary
	64	!
[928]	65	! 927 2012-06-06 19:15:04Z raasch
	66	! Wall flags are not set for multigrid method in case of masking method
	67	!
[865]	68	! 864 2012-03-27 15:10:33Z gryschka
[927]	69	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	70	! were not correctly defined for k=1.
[865]	71	!
[863]	72	! 861 2012-03-26 14:18:34Z suehring
[861]	73	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	74	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	75	! model domain.!
[861]	76	! Initialization of nzb_s_inner and nzb_w_inner.
	77	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	78	! while setting wall_flags_0
	79	!
[844]	80	! 843 2012-02-29 15:16:21Z gryschka
	81	! In case of ocean and dirichlet bc for u and v at the bottom
	82	! the first u-level ist defined at same height as the first w-level
	83	!
[819]	84	! 818 2012-02-08 16:11:23Z maronga
	85	! Bugfix: topo_height is only required if topography is used. It is thus now
	86	! allocated in the topography branch
	87	!
[810]	88	! 809 2012-01-30 13:32:58Z maronga
	89	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	90	!
[808]	91	! 807 2012-01-25 11:53:51Z maronga
	92	! New cpp directive "__check" implemented which is used by check_namelist_files
	93	!
[1]	94	! Revision 1.1 1997/08/11 06:17:45 raasch
	95	! Initial revision (Testversion)
	96	!
	97	!
	98	! Description:
	99	! ------------
	100	! Creating grid depending constants
	101	!------------------------------------------------------------------------------!
	102
[1320]	103	USE arrays_3d, &
	104	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	105	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	106
	107	USE control_parameters, &
	108	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	109	building_length_y, building_wall_left, building_wall_south, &
	110	canyon_height, canyon_wall_left, canyon_wall_south, &
	111	canyon_width_x, canyon_width_y, coupling_char, dp_level_ind_b, &
	112	dz, dz_max, dz_stretch_factor, dz_stretch_level, &
	113	dz_stretch_level_index, ibc_uv_b, io_blocks, io_group, &
	114	inflow_l, inflow_n, inflow_r, inflow_s, masking_method, &
	115	maximum_grid_level, message_string, momentum_advec, ocean, &
	116	outflow_l, outflow_n, outflow_r, outflow_s, prandtl_layer, &
	117	psolver, scalar_advec, topography, topography_grid_convention, &
	118	use_surface_fluxes, use_top_fluxes, wall_adjustment_factor
	119
	120	USE grid_variables, &
	121	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	122	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	123	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	124
	125	USE indices, &
	126	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	127	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
	128	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	129	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	130	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	131	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	132	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	133	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	134	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	135	wall_flags_9
	136
	137	USE kinds
	138
[1]	139	USE pegrid
	140
	141	IMPLICIT NONE
	142
[1320]	143	INTEGER(iwp) :: bh !:
	144	INTEGER(iwp) :: blx !:
	145	INTEGER(iwp) :: bly !:
	146	INTEGER(iwp) :: bxl !:
	147	INTEGER(iwp) :: bxr !:
	148	INTEGER(iwp) :: byn !:
	149	INTEGER(iwp) :: bys !:
	150	INTEGER(iwp) :: ch !:
	151	INTEGER(iwp) :: cwx !:
	152	INTEGER(iwp) :: cwy !:
	153	INTEGER(iwp) :: cxl !:
	154	INTEGER(iwp) :: cxr !:
	155	INTEGER(iwp) :: cyn !:
	156	INTEGER(iwp) :: cys !:
	157	INTEGER(iwp) :: gls !:
	158	INTEGER(iwp) :: i !:
	159	INTEGER(iwp) :: ii !:
	160	INTEGER(iwp) :: inc !:
	161	INTEGER(iwp) :: j !:
	162	INTEGER(iwp) :: k !:
	163	INTEGER(iwp) :: l !:
	164	INTEGER(iwp) :: nxl_l !:
	165	INTEGER(iwp) :: nxr_l !:
	166	INTEGER(iwp) :: nyn_l !:
	167	INTEGER(iwp) :: nys_l !:
	168	INTEGER(iwp) :: nzb_si !:
	169	INTEGER(iwp) :: nzt_l !:
	170	INTEGER(iwp) :: vi !:
[1]	171
[1320]	172	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !:
[1]	173
[1320]	174	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !:
	175	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !:
	176	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !:
	177	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !:
	178	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !:
	179	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !:
	180	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !:
	181	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !:
	182	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !:
	183	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !:
[1]	184
[1320]	185	LOGICAL :: flag_set = .FALSE. !:
[861]	186
[1320]	187	REAL(wp) :: dx_l !:
	188	REAL(wp) :: dy_l !:
	189	REAL(wp) :: dz_stretched !:
[1]	190
[1320]	191	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !:
[1]	192
[667]	193
[1]	194	!
[709]	195	!-- Calculation of horizontal array bounds including ghost layers
[667]	196	nxlg = nxl - nbgp
	197	nxrg = nxr + nbgp
	198	nysg = nys - nbgp
	199	nyng = nyn + nbgp
[709]	200
[667]	201	!
[1]	202	!-- Allocate grid arrays
	203	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	204	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	205
	206	!
	207	!-- Compute height of u-levels from constant grid length and dz stretch factors
	208	IF ( dz == -1.0 ) THEN
[254]	209	message_string = 'missing dz'
	210	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1]	211	ELSEIF ( dz <= 0.0 ) THEN
[254]	212	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	213	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	214	ENDIF
[94]	215
[1]	216	!
[94]	217	!-- Define the vertical grid levels
	218	IF ( .NOT. ocean ) THEN
	219	!
	220	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	221	!-- The second u-level (k=1) corresponds to the top of the
[94]	222	!-- Prandtl-layer.
[667]	223
	224	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
	225	zu(0) = 0.0
	226	! zu(0) = - dz * 0.5
	227	ELSE
	228	zu(0) = - dz * 0.5
	229	ENDIF
[94]	230	zu(1) = dz * 0.5
[1]	231
[94]	232	dz_stretch_level_index = nzt+1
	233	dz_stretched = dz
	234	DO k = 2, nzt+1
	235	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	236	dz_stretched = dz_stretched * dz_stretch_factor
	237	dz_stretched = MIN( dz_stretched, dz_max )
	238	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	239	ENDIF
	240	zu(k) = zu(k-1) + dz_stretched
	241	ENDDO
[1]	242
	243	!
[94]	244	!-- Compute the w-levels. They are always staggered half-way between the
[843]	245	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	246	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	247	!-- The top w-level is extrapolated linearly.
[94]	248	zw(0) = 0.0
	249	DO k = 1, nzt
	250	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	251	ENDDO
	252	zw(nzt+1) = zw(nzt) + 2.0 * ( zu(nzt+1) - zw(nzt) )
[1]	253
[94]	254	ELSE
[1]	255	!
[843]	256	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	257	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	258	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	259	!-- w-level are defined at same height, but staggered from the second level.
	260	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[94]	261	zu(nzt+1) = dz * 0.5
	262	zu(nzt) = - dz * 0.5
	263
	264	dz_stretch_level_index = 0
	265	dz_stretched = dz
	266	DO k = nzt-1, 0, -1
	267	IF ( dz_stretch_level <= ABS( zu(k+1) ) .AND. &
	268	dz_stretched < dz_max ) THEN
	269	dz_stretched = dz_stretched * dz_stretch_factor
	270	dz_stretched = MIN( dz_stretched, dz_max )
	271	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	272	ENDIF
	273	zu(k) = zu(k+1) - dz_stretched
	274	ENDDO
	275
	276	!
	277	!-- Compute the w-levels. They are always staggered half-way between the
[843]	278	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	279	!-- at the ground. In this case the first u- and w-level are defined at
	280	!-- same height. The top w-level (nzt+1) is not used but set for
	281	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	282	zw(nzt+1) = dz
	283	zw(nzt) = 0.0
	284	DO k = 0, nzt
	285	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	286	ENDDO
	287
[843]	288	!
	289	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	290	!-- at same height.
	291	IF ( ibc_uv_b == 0 ) THEN
	292	zu(0) = zw(0)
	293	ENDIF
	294
[94]	295	ENDIF
	296
	297	!
[1]	298	!-- Compute grid lengths.
	299	DO k = 1, nzt+1
	300	dzu(k) = zu(k) - zu(k-1)
	301	ddzu(k) = 1.0 / dzu(k)
	302	dzw(k) = zw(k) - zw(k-1)
	303	ddzw(k) = 1.0 / dzw(k)
	304	ENDDO
	305
	306	DO k = 1, nzt
	307	dd2zu(k) = 1.0 / ( dzu(k) + dzu(k+1) )
	308	ENDDO
[667]	309
	310	!
[709]	311	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	312	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	313	!-- is only dz/2, but should be dz. Therefore, an additional array
	314	!-- containing with appropriate grid information is created for these
	315	!-- solvers.
	316	IF ( psolver /= 'multigrid' ) THEN
[667]	317	ALLOCATE( ddzu_pres(1:nzt+1) )
	318	ddzu_pres = ddzu
[864]	319	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	320	ENDIF
[1]	321
	322	!
	323	!-- In case of multigrid method, compute grid lengths and grid factors for the
	324	!-- grid levels
	325	IF ( psolver == 'multigrid' ) THEN
	326
	327	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	328	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	329	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	330	f1_mg(nzb+1:nzt,maximum_grid_level), &
	331	f2_mg(nzb+1:nzt,maximum_grid_level), &
	332	f3_mg(nzb+1:nzt,maximum_grid_level) )
	333
	334	dzu_mg(:,maximum_grid_level) = dzu
[667]	335	!
[864]	336	!-- Next line to ensure an equally spaced grid.
	337	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	338
[1]	339	dzw_mg(:,maximum_grid_level) = dzw
	340	nzt_l = nzt
	341	DO l = maximum_grid_level-1, 1, -1
	342	dzu_mg(nzb+1,l) = 2.0 * dzu_mg(nzb+1,l+1)
	343	dzw_mg(nzb+1,l) = 2.0 * dzw_mg(nzb+1,l+1)
	344	nzt_l = nzt_l / 2
	345	DO k = 2, nzt_l+1
	346	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	347	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	348	ENDDO
	349	ENDDO
	350
	351	nzt_l = nzt
	352	dx_l = dx
	353	dy_l = dy
	354	DO l = maximum_grid_level, 1, -1
	355	ddx2_mg(l) = 1.0 / dx_l**2
	356	ddy2_mg(l) = 1.0 / dy_l**2
	357	DO k = nzb+1, nzt_l
	358	f2_mg(k,l) = 1.0 / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	359	f3_mg(k,l) = 1.0 / ( dzu_mg(k,l) * dzw_mg(k,l) )
	360	f1_mg(k,l) = 2.0 * ( ddx2_mg(l) + ddy2_mg(l) ) + &
	361	f2_mg(k,l) + f3_mg(k,l)
	362	ENDDO
	363	nzt_l = nzt_l / 2
	364	dx_l = dx_l * 2.0
	365	dy_l = dy_l * 2.0
	366	ENDDO
	367
	368	ENDIF
	369
	370	!
	371	!-- Compute the reciprocal values of the horizontal grid lengths.
	372	ddx = 1.0 / dx
	373	ddy = 1.0 / dy
	374	dx2 = dx * dx
	375	dy2 = dy * dy
	376	ddx2 = 1.0 / dx2
	377	ddy2 = 1.0 / dy2
	378
	379	!
	380	!-- Compute the grid-dependent mixing length.
	381	DO k = 1, nzt
[1322]	382	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	383	ENDDO
	384
	385	!
	386	!-- Allocate outer and inner index arrays for topography and set
[114]	387	!-- defaults.
	388	!-- nzb_local has to contain additional layers of ghost points for calculating
	389	!-- the flag arrays needed for the multigrid method
	390	gls = 2**( maximum_grid_level )
[861]	391	IF ( gls < nbgp ) gls = nbgp
[667]	392
[114]	393	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	394	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	395	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	396	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	397	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	398	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	399	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	400	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	401	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	402	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	403	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	404	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	405	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	406	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	407	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	408	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	409	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	410	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	411	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	412	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	413	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	414	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	415	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	416	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	417	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	418	wall_e_x(nysg:nyng,nxlg:nxrg), &
	419	wall_e_y(nysg:nyng,nxlg:nxrg), &
	420	wall_u(nysg:nyng,nxlg:nxrg), &
	421	wall_v(nysg:nyng,nxlg:nxrg), &
	422	wall_w_x(nysg:nyng,nxlg:nxrg), &
	423	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	424
	425
[667]	426
	427	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	428
[818]	429
[1]	430	nzb_s_inner = nzb; nzb_s_outer = nzb
	431	nzb_u_inner = nzb; nzb_u_outer = nzb
	432	nzb_v_inner = nzb; nzb_v_outer = nzb
	433	nzb_w_inner = nzb; nzb_w_outer = nzb
	434
[1221]	435	rflags_s_inner = 1.0
	436	rflags_invers = 1.0
	437
[1]	438	!
[19]	439	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	440	!-- form (which does not use surface fluxes) is applied
	441	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	442	nzb_diff = nzb + 2
	443	ELSE
	444	nzb_diff = nzb + 1
	445	ENDIF
[19]	446	IF ( use_top_fluxes ) THEN
	447	nzt_diff = nzt - 1
	448	ELSE
	449	nzt_diff = nzt
	450	ENDIF
[1]	451
	452	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	453	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	454
	455	wall_e_x = 0.0; wall_e_y = 0.0; wall_u = 0.0; wall_v = 0.0
	456	wall_w_x = 0.0; wall_w_y = 0.0
	457	fwxp = 1.0; fwxm = 1.0; fwyp = 1.0; fwym = 1.0
	458	fxp = 1.0; fxm = 1.0; fyp = 1.0; fym = 1.0
	459
	460	!
	461	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	462	!-- for the moment,
	463	!-- multiplication with wall_adjustment_factor near the end of this routine
	464	l_wall(nzb,:,:) = l_grid(1)
	465	DO k = nzb+1, nzt
	466	l_wall(k,:,:) = l_grid(k)
	467	ENDDO
	468	l_wall(nzt+1,:,:) = l_grid(nzt)
	469
	470	ALLOCATE ( vertical_influence(nzb:nzt) )
	471	DO k = 1, nzt
	472	vertical_influence(k) = MIN ( INT( l_grid(k) / &
	473	( wall_adjustment_factor * dzw(k) ) + 0.5 ), nzt - k )
	474	ENDDO
	475
	476	DO k = 1, MAXVAL( nzb_s_inner )
	477	IF ( l_grid(k) > 1.5 * dx * wall_adjustment_factor .OR. &
	478	l_grid(k) > 1.5 * dy * wall_adjustment_factor ) THEN
[254]	479	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	480	'threshold given by only local', &
	481	' &horizontal reduction of near_wall ', &
	482	'mixing length l_wall', &
	483	' &starting from height level k = ', k, '.'
	484	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	485	EXIT
	486	ENDIF
	487	ENDDO
	488	vertical_influence(0) = vertical_influence(1)
	489
[667]	490	DO i = nxlg, nxrg
	491	DO j = nysg, nyng
[1]	492	DO k = nzb_s_inner(j,i) + 1, &
	493	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	494	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	495	ENDDO
	496	ENDDO
	497	ENDDO
	498
	499	!
	500	!-- Set outer and inner index arrays for non-flat topography.
	501	!-- Here consistency checks concerning domain size and periodicity are
	502	!-- necessary.
	503	!-- Within this SELECT CASE structure only nzb_local is initialized
	504	!-- individually depending on the chosen topography type, all other index
	505	!-- arrays are initialized further below.
	506	SELECT CASE ( TRIM( topography ) )
	507
	508	CASE ( 'flat' )
	509	!
[555]	510	!-- nzb_local is required for the multigrid solver
	511	nzb_local = 0
[1]	512
	513	CASE ( 'single_building' )
	514	!
	515	!-- Single rectangular building, by default centered in the middle of the
	516	!-- total domain
	517	blx = NINT( building_length_x / dx )
	518	bly = NINT( building_length_y / dy )
	519	bh = NINT( building_height / dz )
	520
[1322]	521	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	522	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	523	ENDIF
	524	bxl = NINT( building_wall_left / dx )
	525	bxr = bxl + blx
	526
[1322]	527	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	528	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	529	ENDIF
	530	bys = NINT( building_wall_south / dy )
	531	byn = bys + bly
	532
	533	!
	534	!-- Building size has to meet some requirements
	535	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	536	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	537	WRITE( message_string, * ) 'inconsistent building parameters:', &
	538	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	539	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	540	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	541	ENDIF
	542
	543	!
[217]	544	!-- Define the building.
[1]	545	nzb_local = 0
[134]	546	nzb_local(bys:byn,bxl:bxr) = bh
[1]	547
[240]	548	CASE ( 'single_street_canyon' )
	549	!
	550	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	551	!-- The canyon is centered in the other direction by default.
[1322]	552	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	553	!
	554	!-- Street canyon in y direction
	555	cwx = NINT( canyon_width_x / dx )
[1322]	556	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	557	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	558	ENDIF
	559	cxl = NINT( canyon_wall_left / dx )
	560	cxr = cxl + cwx
	561
[1322]	562	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	563	!
	564	!-- Street canyon in x direction
	565	cwy = NINT( canyon_width_y / dy )
[1322]	566	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	567	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	568	ENDIF
	569	cys = NINT( canyon_wall_south / dy )
	570	cyn = cys + cwy
	571
	572	ELSE
[254]	573
	574	message_string = 'no street canyon width given'
	575	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	576
[240]	577	ENDIF
	578
	579	ch = NINT( canyon_height / dz )
	580	dp_level_ind_b = ch
	581	!
	582	!-- Street canyon size has to meet some requirements
[1322]	583	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	584	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
	585	( ch < 3 ) ) THEN
[254]	586	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	587	'&cxl=', cxl, 'cxr=', cxr, &
	588	'cwx=', cwx, &
[254]	589	'ch=', ch, 'nx=', nx, 'ny=', ny
	590	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	591	ENDIF
[1322]	592	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	593	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
	594	( ch < 3 ) ) THEN
[254]	595	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	596	'&cys=', cys, 'cyn=', cyn, &
	597	'cwy=', cwy, &
[254]	598	'ch=', ch, 'nx=', nx, 'ny=', ny
	599	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	600	ENDIF
	601	ENDIF
[1322]	602	IF ( canyon_width_x /= 9999999.9_wp .AND. canyon_width_y /= 9999999.9_wp ) &
[240]	603	THEN
[274]	604	message_string = 'inconsistent canyon parameters:' // &
[254]	605	'&street canyon can only be oriented' // &
	606	'&either in x- or in y-direction'
	607	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	608	ENDIF
	609
	610	nzb_local = ch
[1322]	611	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	612	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	613	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	614	nzb_local(cys+1:cyn-1,:) = 0
	615	ENDIF
	616
[1]	617	CASE ( 'read_from_file' )
[759]	618
[818]	619	ALLOCATE ( topo_height(0:ny,0:nx) )
	620
[759]	621	DO ii = 0, io_blocks-1
	622	IF ( ii == io_group ) THEN
	623
[1]	624	!
[759]	625	!-- Arbitrary irregular topography data in PALM format (exactly
	626	!-- matching the grid size and total domain size)
[1069]	627	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	628	FORM='FORMATTED', ERR=10 )
	629	DO j = ny, 0, -1
	630	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	631	ENDDO
	632
	633	GOTO 12
	634
[1069]	635	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	636	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	637
[1069]	638	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	639	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	640
	641	12 CLOSE( 90 )
	642
	643	ENDIF
[809]	644	#if defined( __parallel ) && ! defined ( __check )
[759]	645	CALL MPI_BARRIER( comm2d, ierr )
	646	#endif
[559]	647	ENDDO
[759]	648
[1]	649	!
	650	!-- Calculate the index height of the topography
	651	DO i = 0, nx
	652	DO j = 0, ny
	653	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
	654	ENDDO
	655	ENDDO
[818]	656
	657	DEALLOCATE ( topo_height )
[114]	658	!
[759]	659	!-- Add cyclic boundaries (additional layers are for calculating
	660	!-- flag arrays needed for the multigrid sover)
[114]	661	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	662	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	663	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	664	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	665
[1]	666	CASE DEFAULT
	667	!
	668	!-- The DEFAULT case is reached either if the parameter topography
[217]	669	!-- contains a wrong character string or if the user has defined a special
[1]	670	!-- case in the user interface. There, the subroutine user_init_grid
	671	!-- checks which of these two conditions applies.
[114]	672	CALL user_init_grid( gls, nzb_local )
[1]	673
	674	END SELECT
	675	!
[861]	676	!-- Determine the maximum level of topography. Furthermore it is used for
	677	!-- steering the degradation of order of the applied advection scheme.
[978]	678	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	679	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[861]	680	nzb_max = MAXVAL( nzb_local )
[978]	681	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
	682	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	683	nzb_max = nzt
	684	ENDIF
	685
[861]	686	!
[1]	687	!-- Consistency checks and index array initialization are only required for
[217]	688	!-- non-flat topography, also the initialization of topography height arrays
[49]	689	!-- zu_s_inner and zw_w_inner
[1]	690	IF ( TRIM( topography ) /= 'flat' ) THEN
	691
	692	!
	693	!-- Consistency checks
	694	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[274]	695	WRITE( message_string, * ) 'nzb_local values are outside the', &
	696	'model domain', &
	697	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
	698	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	699	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	700	ENDIF
	701
[722]	702	IF ( bc_lr == 'cyclic' ) THEN
[1]	703	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
	704	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[254]	705	message_string = 'nzb_local does not fulfill cyclic' // &
	706	' boundary condition in x-direction'
	707	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	708	ENDIF
	709	ENDIF
[722]	710	IF ( bc_ns == 'cyclic' ) THEN
[1]	711	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
	712	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[254]	713	message_string = 'nzb_local does not fulfill cyclic' // &
	714	' boundary condition in y-direction'
	715	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	716	ENDIF
	717	ENDIF
	718
[217]	719	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	720	!
[217]	721	!-- The array nzb_local as defined using the 'cell_edge' convention
	722	!-- describes the actual total size of topography which is defined at the
	723	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	724	!-- on the topography walls in y-direction. However, PALM uses individual
	725	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	726	!-- Therefore, the extent of topography in nzb_local is now reduced by
	727	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	728	!-- to form the basis for nzb_s_inner.
	729	DO j = -gls, ny + gls
	730	DO i = -gls, nx
	731	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	732	ENDDO
[134]	733	ENDDO
[217]	734	!-- apply cyclic boundary conditions in x-direction
	735	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	736	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	737	DO i = -gls, nx + gls
	738	DO j = -gls, ny
	739	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	740	ENDDO
[134]	741	ENDDO
[217]	742	!-- apply cyclic boundary conditions in y-direction
	743	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	744	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	745	ENDIF
[134]	746
[1]	747	!
	748	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	749	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	750	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	751
	752	!
	753	!-- Initialize remaining index arrays:
	754	!-- first pre-initialize them with nzb_s_inner...
	755	nzb_u_inner = nzb_s_inner
	756	nzb_u_outer = nzb_s_inner
	757	nzb_v_inner = nzb_s_inner
	758	nzb_v_outer = nzb_s_inner
	759	nzb_w_outer = nzb_s_inner
	760	nzb_s_outer = nzb_s_inner
	761
	762	!
	763	!-- ...then extend pre-initialized arrays in their according directions
	764	!-- based on nzb_local using nzb_tmp as a temporary global index array
	765
	766	!
	767	!-- nzb_s_outer:
	768	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	769	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	770	DO j = -1, ny + 1
	771	DO i = 0, nx
	772	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
	773	nzb_local(j,i+1) )
	774	ENDDO
	775	ENDDO
	776	DO i = nxl, nxr
	777	DO j = nys, nyn
	778	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	779	nzb_tmp(j+1,i) )
	780	ENDDO
	781	!
	782	!-- non-cyclic boundary conditions (overwritten by call of
	783	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	784	IF ( nys == 0 ) THEN
	785	j = -1
	786	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	787	ENDIF
	788	IF ( nys == ny ) THEN
	789	j = ny + 1
	790	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	791	ENDIF
	792	ENDDO
	793	!
	794	!-- nzb_w_outer:
	795	!-- identical to nzb_s_outer
	796	nzb_w_outer = nzb_s_outer
	797
	798	!
	799	!-- nzb_u_inner:
	800	!-- extend nzb_local rightwards only
[667]	801	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	802	DO j = -1, ny + 1
	803	DO i = 0, nx + 1
	804	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	805	ENDDO
	806	ENDDO
[667]	807	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	808
	809	!
	810	!-- nzb_u_outer:
	811	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	812	DO i = nxl, nxr
	813	DO j = nys, nyn
	814	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	815	nzb_tmp(j+1,i) )
	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 ( nys == 0 ) THEN
	821	j = -1
	822	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	823	ENDIF
	824	IF ( nys == ny ) THEN
	825	j = ny + 1
	826	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	827	ENDIF
	828	ENDDO
	829
	830	!
	831	!-- nzb_v_inner:
	832	!-- extend nzb_local northwards only
[667]	833	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	834	DO i = -1, nx + 1
	835	DO j = 0, ny + 1
	836	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	837	ENDDO
	838	ENDDO
[667]	839	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	840
	841	!
	842	!-- nzb_v_outer:
	843	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	844	DO j = nys, nyn
	845	DO i = nxl, nxr
	846	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
	847	nzb_tmp(j,i+1) )
	848	ENDDO
	849	!
	850	!-- non-cyclic boundary conditions (overwritten by call of
	851	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	852	IF ( nxl == 0 ) THEN
	853	i = -1
	854	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	855	ENDIF
	856	IF ( nxr == nx ) THEN
	857	i = nx + 1
	858	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	859	ENDIF
	860	ENDDO
[809]	861	#if ! defined ( __check )
[1]	862	!
	863	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	864	!-- boundary conditions, if applicable.
	865	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	866	!-- they do not require exchange and are not included here.
	867	CALL exchange_horiz_2d_int( nzb_u_inner )
	868	CALL exchange_horiz_2d_int( nzb_u_outer )
	869	CALL exchange_horiz_2d_int( nzb_v_inner )
	870	CALL exchange_horiz_2d_int( nzb_v_outer )
	871	CALL exchange_horiz_2d_int( nzb_w_outer )
	872	CALL exchange_horiz_2d_int( nzb_s_outer )
	873
[49]	874	!
	875	!-- Allocate and set the arrays containing the topography height
	876	IF ( myid == 0 ) THEN
	877
	878	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	879
	880	DO i = 0, nx + 1
	881	DO j = 0, ny + 1
	882	zu_s_inner(i,j) = zu(nzb_local(j,i))
	883	zw_w_inner(i,j) = zw(nzb_local(j,i))
	884	ENDDO
	885	ENDDO
	886
	887	ENDIF
[1221]	888	!
	889	!-- Set flag arrays to be used for masking of grid points
	890	DO i = nxlg, nxrg
	891	DO j = nysg, nyng
	892	DO k = nzb, nzt+1
	893	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0
	894	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0
	895	ENDDO
	896	ENDDO
	897	ENDDO
[807]	898	#endif
[1]	899	ENDIF
	900
[809]	901	#if ! defined ( __check )
[1]	902	!
	903	!-- Preliminary: to be removed after completion of the topography code!
	904	!-- Set the former default k index arrays nzb_2d
	905	nzb_2d = nzb
	906
	907	!
	908	!-- Set the individual index arrays which define the k index from which on
	909	!-- the usual finite difference form (which does not use surface fluxes) is
	910	!-- applied
	911	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	912	nzb_diff_u = nzb_u_inner + 2
	913	nzb_diff_v = nzb_v_inner + 2
	914	nzb_diff_s_inner = nzb_s_inner + 2
	915	nzb_diff_s_outer = nzb_s_outer + 2
	916	ELSE
	917	nzb_diff_u = nzb_u_inner + 1
	918	nzb_diff_v = nzb_v_inner + 1
	919	nzb_diff_s_inner = nzb_s_inner + 1
	920	nzb_diff_s_outer = nzb_s_outer + 1
	921	ENDIF
	922
	923	!
	924	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	925	!-- for limitation of near-wall mixing length l_wall further below
	926	corner_nl = 0
	927	corner_nr = 0
	928	corner_sl = 0
	929	corner_sr = 0
	930	wall_l = 0
	931	wall_n = 0
	932	wall_r = 0
	933	wall_s = 0
	934
	935	DO i = nxl, nxr
	936	DO j = nys, nyn
	937	!
	938	!-- u-component
	939	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
	940	wall_u(j,i) = 1.0 ! north wall (location of adjacent fluid)
	941	fym(j,i) = 0.0
	942	fyp(j,i) = 1.0
	943	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
	944	wall_u(j,i) = 1.0 ! south wall (location of adjacent fluid)
	945	fym(j,i) = 1.0
	946	fyp(j,i) = 0.0
	947	ENDIF
	948	!
	949	!-- v-component
	950	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
	951	wall_v(j,i) = 1.0 ! rigth wall (location of adjacent fluid)
	952	fxm(j,i) = 0.0
	953	fxp(j,i) = 1.0
	954	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
	955	wall_v(j,i) = 1.0 ! left wall (location of adjacent fluid)
	956	fxm(j,i) = 1.0
	957	fxp(j,i) = 0.0
	958	ENDIF
	959	!
	960	!-- w-component, also used for scalars, separate arrays for shear
	961	!-- production of tke
	962	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
	963	wall_e_y(j,i) = 1.0 ! north wall (location of adjacent fluid)
	964	wall_w_y(j,i) = 1.0
	965	fwym(j,i) = 0.0
	966	fwyp(j,i) = 1.0
	967	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
	968	wall_e_y(j,i) = -1.0 ! south wall (location of adjacent fluid)
	969	wall_w_y(j,i) = 1.0
	970	fwym(j,i) = 1.0
	971	fwyp(j,i) = 0.0
	972	ENDIF
	973	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
	974	wall_e_x(j,i) = 1.0 ! right wall (location of adjacent fluid)
	975	wall_w_x(j,i) = 1.0
	976	fwxm(j,i) = 0.0
	977	fwxp(j,i) = 1.0
	978	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
	979	wall_e_x(j,i) = -1.0 ! left wall (location of adjacent fluid)
	980	wall_w_x(j,i) = 1.0
	981	fwxm(j,i) = 1.0
	982	fwxp(j,i) = 0.0
	983	ENDIF
	984	!
	985	!-- Wall and corner locations inside buildings for limitation of
	986	!-- near-wall mixing length l_wall
	987	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	988
	989	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	990
	991	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	992	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	993	nzb_s_inner(j,i-1) ) + 1
	994	ENDIF
	995
	996	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	997	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	998	nzb_s_inner(j,i+1) ) + 1
	999	ENDIF
	1000
	1001	ENDIF
	1002
	1003	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1004
	1005	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1006	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1007	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1008	nzb_s_inner(j,i-1) ) + 1
	1009	ENDIF
	1010
	1011	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1012	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1013	nzb_s_inner(j,i+1) ) + 1
	1014	ENDIF
	1015
	1016	ENDIF
	1017
	1018	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1019	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1020	ENDIF
	1021
	1022	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1023	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1024	ENDIF
	1025
	1026	ENDDO
	1027	ENDDO
	1028
	1029	!
[114]	1030	!-- Calculate wall flag arrays for the multigrid method
	1031	IF ( psolver == 'multigrid' ) THEN
	1032	!
	1033	!-- Gridpoint increment of the current level
	1034	inc = 1
	1035
	1036	DO l = maximum_grid_level, 1 , -1
	1037
	1038	nxl_l = nxl_mg(l)
	1039	nxr_l = nxr_mg(l)
	1040	nys_l = nys_mg(l)
	1041	nyn_l = nyn_mg(l)
	1042	nzt_l = nzt_mg(l)
	1043
	1044	!
	1045	!-- Assign the flag level to be calculated
	1046	SELECT CASE ( l )
	1047	CASE ( 1 )
	1048	flags => wall_flags_1
	1049	CASE ( 2 )
	1050	flags => wall_flags_2
	1051	CASE ( 3 )
	1052	flags => wall_flags_3
	1053	CASE ( 4 )
	1054	flags => wall_flags_4
	1055	CASE ( 5 )
	1056	flags => wall_flags_5
	1057	CASE ( 6 )
	1058	flags => wall_flags_6
	1059	CASE ( 7 )
	1060	flags => wall_flags_7
	1061	CASE ( 8 )
	1062	flags => wall_flags_8
	1063	CASE ( 9 )
	1064	flags => wall_flags_9
	1065	CASE ( 10 )
	1066	flags => wall_flags_10
	1067	END SELECT
	1068
	1069	!
	1070	!-- Depending on the grid level, set the respective bits in case of
	1071	!-- neighbouring walls
	1072	!-- Bit 0: wall to the bottom
	1073	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1074	!-- Bit 2: wall to the south
	1075	!-- Bit 3: wall to the north
	1076	!-- Bit 4: wall to the left
	1077	!-- Bit 5: wall to the right
[116]	1078	!-- Bit 6: inside building
[114]	1079
	1080	flags = 0
	1081
[927]	1082	!
	1083	!-- In case of masking method, flags are not set and multigrid method
	1084	!-- works like FFT-solver
	1085	IF ( .NOT. masking_method ) THEN
	1086
	1087	DO i = nxl_l-1, nxr_l+1
	1088	DO j = nys_l-1, nyn_l+1
	1089	DO k = nzb, nzt_l+1
[114]	1090
	1091	!
[927]	1092	!-- Inside/outside building (inside building does not need
	1093	!-- further tests for walls)
	1094	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1095
[927]	1096	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1097
[927]	1098	ELSE
[114]	1099	!
[927]	1100	!-- Bottom wall
	1101	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1102	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1103	ENDIF
[114]	1104	!
[927]	1105	!-- South wall
	1106	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1107	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1108	ENDIF
[114]	1109	!
[927]	1110	!-- North wall
	1111	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1112	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1113	ENDIF
[114]	1114	!
[927]	1115	!-- Left wall
	1116	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1117	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1118	ENDIF
[114]	1119	!
[927]	1120	!-- Right wall
	1121	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1122	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1123	ENDIF
	1124
[114]	1125	ENDIF
	1126
[927]	1127	ENDDO
[114]	1128	ENDDO
	1129	ENDDO
	1130
[927]	1131	ENDIF
	1132
[114]	1133	!
	1134	!-- Test output of flag arrays
[145]	1135	! i = nxl_l
	1136	! WRITE (9,*) ' '
	1137	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1138	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1139	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1140	! DO k = nzt_l+1, nzb, -1
	1141	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1142	! ENDDO
[114]	1143
	1144	inc = inc * 2
	1145
	1146	ENDDO
	1147
	1148	ENDIF
[861]	1149	!
	1150	!-- Allocate flags needed for masking walls.
[1221]	1151	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr), &
	1152	wall_flags_00(nzb:nzt,nys:nyn,nxl:nxr) )
	1153	wall_flags_0 = 0
	1154	wall_flags_00 = 0
[114]	1155
[861]	1156	IF ( scalar_advec == 'ws-scheme' ) THEN
[114]	1157	!
[861]	1158	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1159	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1160	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1161	!-- grid points.
	1162	DO i = nxl, nxr
	1163	DO j = nys, nyn
	1164	DO k = nzb_s_inner(j,i)+1, nzt
	1165	!
	1166	!-- scalar - x-direction
	1167	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1168	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1169	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1170	.AND. i == nxr ) ) THEN
[861]	1171	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1172	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1173	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1174	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1175	) THEN
[861]	1176	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1177	ELSE
	1178	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1179	ENDIF
	1180	!
	1181	!-- scalar - y-direction
	1182	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1183	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1184	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1185	.AND. j == nyn ) ) THEN
[861]	1186	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1187	!-- WS3
	1188	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1189	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1190	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1191	) THEN
[861]	1192	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1193	!-- WS5
	1194	ELSE
	1195	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1196	ENDIF
	1197	!
	1198	!-- scalar - z-direction
	1199	!-- WS1 (6), WS3 (7), WS5 (8)
	1200	flag_set = .FALSE.
	1201	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1202	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1203	flag_set = .TRUE.
	1204	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1205	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1206	flag_set = .TRUE.
	1207	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1208	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1209	ENDIF
	1210	ENDDO
	1211	ENDDO
	1212	ENDDO
	1213	ENDIF
	1214
	1215	IF ( momentum_advec == 'ws-scheme' ) THEN
	1216	!
	1217	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1218	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1219	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1220	!-- grid points.
	1221	DO i = nxl, nxr
	1222	DO j = nys, nyn
	1223	DO k = nzb_u_inner(j,i)+1, nzt
	1224	!
	1225	!-- u component - x-direction
	1226	!-- WS1 (9), WS3 (10), WS5 (11)
	1227	IF ( k <= nzb_u_inner(j,i+1) &
[978]	1228	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1229	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1230	) THEN
[861]	1231	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1232	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1233	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1234	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1235	) THEN
[861]	1236	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
	1237	ELSE
	1238	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
	1239	ENDIF
[978]	1240
[861]	1241	!
	1242	!-- u component - y-direction
	1243	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1244	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1245	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1246	.AND. j == nyn ) ) THEN
[861]	1247	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1248	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1249	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1250	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1251	) THEN
[861]	1252	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
	1253	ELSE
	1254	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
	1255	ENDIF
	1256	!
	1257	!-- u component - z-direction
	1258	!-- WS1 (15), WS3 (16), WS5 (17)
	1259	flag_set = .FALSE.
	1260	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1261	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1262	flag_set = .TRUE.
	1263	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1264	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1265	flag_set = .TRUE.
	1266	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1267	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1268	ENDIF
	1269
	1270	ENDDO
	1271	ENDDO
	1272	ENDDO
	1273
	1274	DO i = nxl, nxr
	1275	DO j = nys, nyn
	1276	DO k = nzb_v_inner(j,i)+1, nzt
	1277	!
	1278	!-- v component - x-direction
	1279	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1280	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1281	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1282	.AND. i == nxr ) ) THEN
[861]	1283	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1284	!-- WS3
	1285	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1286	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1287	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1288	) THEN
[861]	1289	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
	1290	ELSE
	1291	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
	1292	ENDIF
	1293	!
	1294	!-- v component - y-direction
	1295	!-- WS1 (21), WS3 (22), WS5 (23)
	1296	IF ( k <= nzb_v_inner(j+1,i) &
[978]	1297	.OR. ( ( inflow_s .OR. outflow_s ) .AND. i == nysv ) &
	1298	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1299	) THEN
[861]	1300	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1301	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1302	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1303	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1304	) THEN
[861]	1305	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
	1306	ELSE
	1307	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
	1308	ENDIF
	1309	!
	1310	!-- v component - z-direction
	1311	!-- WS1 (24), WS3 (25), WS5 (26)
	1312	flag_set = .FALSE.
	1313	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1314	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1315	flag_set = .TRUE.
	1316	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1317	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1318	flag_set = .TRUE.
	1319	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1320	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1321	ENDIF
	1322
	1323	ENDDO
	1324	ENDDO
	1325	ENDDO
	1326	DO i = nxl, nxr
	1327	DO j = nys, nyn
[1015]	1328	DO k = nzb_w_inner(j,i), nzt
[861]	1329	!
	1330	!-- w component - x-direction
	1331	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1332	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1333	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1334	.AND. i == nxr ) ) THEN
[861]	1335	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1336	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1337	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1338	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1339	) THEN
[861]	1340	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
	1341	ELSE
	1342	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
	1343	ENDIF
	1344	!
	1345	!-- w component - y-direction
	1346	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1347	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1348	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1349	.AND. j == nyn ) ) THEN
[861]	1350	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1351	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1352	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1353	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1354	) THEN
[861]	1355	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
	1356	ELSE
[1221]	1357	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[861]	1358	ENDIF
	1359	!
	1360	!-- w component - z-direction
	1361	!-- WS1 (33), WS3 (34), WS5 (35)
	1362	flag_set = .FALSE.
	1363	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1364	.OR. k == nzt ) THEN
	1365	!
	1366	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1367	!-- set, although this is not a prognostic level. However,
	1368	!-- contrary to the advection of u,v and s this is necessary
	1369	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1370	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1371	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1372	flag_set = .TRUE.
	1373	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1374	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1375	flag_set = .TRUE.
	1376	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1377	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1378	ENDIF
	1379
	1380	ENDDO
	1381	ENDDO
	1382	ENDDO
	1383
	1384	ENDIF
	1385
	1386	!
[1]	1387	!-- In case of topography: limit near-wall mixing length l_wall further:
	1388	!-- Go through all points of the subdomain one by one and look for the closest
	1389	!-- surface
	1390	IF ( TRIM(topography) /= 'flat' ) THEN
	1391	DO i = nxl, nxr
	1392	DO j = nys, nyn
	1393
	1394	nzb_si = nzb_s_inner(j,i)
	1395	vi = vertical_influence(nzb_si)
	1396
	1397	IF ( wall_n(j,i) > 0 ) THEN
	1398	!
	1399	!-- North wall (y distance)
	1400	DO k = wall_n(j,i), nzb_si
	1401	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5 * dy )
	1402	ENDDO
	1403	!
	1404	!-- Above North wall (yz distance)
	1405	DO k = nzb_si + 1, 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	!-- Northleft corner (xy distance)
	1412	IF ( corner_nl(j,i) > 0 ) THEN
	1413	DO k = corner_nl(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 Northleft 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	!-- Northright corner (xy distance)
	1427	IF ( corner_nr(j,i) > 0 ) THEN
	1428	DO k = corner_nr(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 northright 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	ENDIF
	1441
	1442	IF ( wall_s(j,i) > 0 ) THEN
	1443	!
	1444	!-- South wall (y distance)
	1445	DO k = wall_s(j,i), nzb_si
	1446	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5 * dy )
	1447	ENDDO
	1448	!
	1449	!-- Above south wall (yz distance)
	1450	DO k = nzb_si + 1, &
	1451	nzb_si + vi
	1452	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1453	SQRT( 0.25 * dy**2 + &
	1454	( zu(k) - zw(nzb_si) )**2 ) )
	1455	ENDDO
	1456	!
	1457	!-- Southleft corner (xy distance)
	1458	IF ( corner_sl(j,i) > 0 ) THEN
	1459	DO k = corner_sl(j,i), nzb_si
	1460	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1461	0.5 * SQRT( dx2 + dy2 ) )
	1462	ENDDO
	1463	!
	1464	!-- Above southleft corner (xyz distance)
	1465	DO k = nzb_si + 1, nzb_si + vi
	1466	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1467	SQRT( 0.25 * (dx2 + dy2) + &
	1468	( zu(k) - zw(nzb_si) )**2 ) )
	1469	ENDDO
	1470	ENDIF
	1471	!
	1472	!-- Southright corner (xy distance)
	1473	IF ( corner_sr(j,i) > 0 ) THEN
	1474	DO k = corner_sr(j,i), nzb_si
	1475	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1476	0.5 * SQRT( dx2 + dy2 ) )
	1477	ENDDO
	1478	!
	1479	!-- Above southright corner (xyz distance)
	1480	DO k = nzb_si + 1, nzb_si + vi
	1481	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1482	SQRT( 0.25 * (dx2 + dy2) + &
	1483	( zu(k) - zw(nzb_si) )**2 ) )
	1484	ENDDO
	1485	ENDIF
	1486
	1487	ENDIF
	1488
	1489	IF ( wall_l(j,i) > 0 ) THEN
	1490	!
	1491	!-- Left wall (x distance)
	1492	DO k = wall_l(j,i), nzb_si
	1493	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5 * dx )
	1494	ENDDO
	1495	!
	1496	!-- Above left wall (xz distance)
	1497	DO k = nzb_si + 1, nzb_si + vi
	1498	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1499	SQRT( 0.25 * dx**2 + &
	1500	( zu(k) - zw(nzb_si) )**2 ) )
	1501	ENDDO
	1502	ENDIF
	1503
	1504	IF ( wall_r(j,i) > 0 ) THEN
	1505	!
	1506	!-- Right wall (x distance)
	1507	DO k = wall_r(j,i), nzb_si
	1508	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5 * dx )
	1509	ENDDO
	1510	!
	1511	!-- Above right wall (xz distance)
	1512	DO k = nzb_si + 1, nzb_si + vi
	1513	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1514	SQRT( 0.25 * dx**2 + &
	1515	( zu(k) - zw(nzb_si) )**2 ) )
	1516	ENDDO
	1517
	1518	ENDIF
	1519
	1520	ENDDO
	1521	ENDDO
	1522
	1523	ENDIF
	1524
	1525	!
	1526	!-- Multiplication with wall_adjustment_factor
	1527	l_wall = wall_adjustment_factor * l_wall
	1528
	1529	!
[709]	1530	!-- Set lateral boundary conditions for l_wall
[667]	1531	CALL exchange_horiz( l_wall, nbgp )
	1532
[1]	1533	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1534	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1535
[807]	1536	#endif
[1]	1537
	1538	END SUBROUTINE init_grid

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