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source: palm/trunk/SOURCE/init_grid.f90 @ 1404

Last change on this file since 1404 was 1354, checked in by heinze, 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	! -----------------
[1354]	22	!
	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_grid.f90 1354 2014-04-08 15:22:57Z keck $
	27	!
[1354]	28	! 1353 2014-04-08 15:21:23Z heinze
	29	! REAL constants provided with KIND-attribute
	30	!
[1323]	31	! 1322 2014-03-20 16:38:49Z raasch
	32	! REAL constants defined as wp-kind
	33	!
[1321]	34	! 1320 2014-03-20 08:40:49Z raasch
[1320]	35	! ONLY-attribute added to USE-statements,
	36	! kind-parameters added to all INTEGER and REAL declaration statements,
	37	! kinds are defined in new module kinds,
	38	! revision history before 2012 removed,
	39	! comment fields (!:) to be used for variable explanations added to
	40	! all variable declaration statements
[1321]	41	!
[1222]	42	! 1221 2013-09-10 08:59:13Z raasch
	43	! wall_flags_00 introduced to hold bits 32-63,
	44	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	45	! loops optimized for openACC (pres + flow_statistics)
	46	!
[1093]	47	! 1092 2013-02-02 11:24:22Z raasch
	48	! unused variables removed
	49	!
[1070]	50	! 1069 2012-11-28 16:18:43Z maronga
	51	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	52	! model in case of coupled runs
	53	!
[1037]	54	! 1036 2012-10-22 13:43:42Z raasch
	55	! code put under GPL (PALM 3.9)
	56	!
[1017]	57	! 1015 2012-09-27 09:23:24Z raasch
	58	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	59	! nzb_w_inner+1
	60	!
[997]	61	! 996 2012-09-07 10:41:47Z raasch
	62	! little reformatting
	63	!
[979]	64	! 978 2012-08-09 08:28:32Z fricke
	65	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	66	! Bugfix: Set wall_flags_0 for inflow boundary
	67	!
[928]	68	! 927 2012-06-06 19:15:04Z raasch
	69	! Wall flags are not set for multigrid method in case of masking method
	70	!
[865]	71	! 864 2012-03-27 15:10:33Z gryschka
[927]	72	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	73	! were not correctly defined for k=1.
[865]	74	!
[863]	75	! 861 2012-03-26 14:18:34Z suehring
[861]	76	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	77	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	78	! model domain.!
[861]	79	! Initialization of nzb_s_inner and nzb_w_inner.
	80	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	81	! while setting wall_flags_0
	82	!
[844]	83	! 843 2012-02-29 15:16:21Z gryschka
	84	! In case of ocean and dirichlet bc for u and v at the bottom
	85	! the first u-level ist defined at same height as the first w-level
	86	!
[819]	87	! 818 2012-02-08 16:11:23Z maronga
	88	! Bugfix: topo_height is only required if topography is used. It is thus now
	89	! allocated in the topography branch
	90	!
[810]	91	! 809 2012-01-30 13:32:58Z maronga
	92	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	93	!
[808]	94	! 807 2012-01-25 11:53:51Z maronga
	95	! New cpp directive "__check" implemented which is used by check_namelist_files
	96	!
[1]	97	! Revision 1.1 1997/08/11 06:17:45 raasch
	98	! Initial revision (Testversion)
	99	!
	100	!
	101	! Description:
	102	! ------------
	103	! Creating grid depending constants
	104	!------------------------------------------------------------------------------!
	105
[1320]	106	USE arrays_3d, &
	107	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	108	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	109
[1353]	110	USE control_parameters, &
[1320]	111	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	112	building_length_y, building_wall_left, building_wall_south, &
	113	canyon_height, canyon_wall_left, canyon_wall_south, &
	114	canyon_width_x, canyon_width_y, coupling_char, dp_level_ind_b, &
	115	dz, dz_max, dz_stretch_factor, dz_stretch_level, &
	116	dz_stretch_level_index, ibc_uv_b, io_blocks, io_group, &
	117	inflow_l, inflow_n, inflow_r, inflow_s, masking_method, &
	118	maximum_grid_level, message_string, momentum_advec, ocean, &
	119	outflow_l, outflow_n, outflow_r, outflow_s, prandtl_layer, &
	120	psolver, scalar_advec, topography, topography_grid_convention, &
	121	use_surface_fluxes, use_top_fluxes, wall_adjustment_factor
	122
	123	USE grid_variables, &
	124	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	125	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	126	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	127
	128	USE indices, &
	129	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	130	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
	131	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	132	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	133	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	134	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	135	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	136	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	137	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	138	wall_flags_9
	139
	140	USE kinds
	141
[1]	142	USE pegrid
	143
	144	IMPLICIT NONE
	145
[1320]	146	INTEGER(iwp) :: bh !:
	147	INTEGER(iwp) :: blx !:
	148	INTEGER(iwp) :: bly !:
	149	INTEGER(iwp) :: bxl !:
	150	INTEGER(iwp) :: bxr !:
	151	INTEGER(iwp) :: byn !:
	152	INTEGER(iwp) :: bys !:
	153	INTEGER(iwp) :: ch !:
	154	INTEGER(iwp) :: cwx !:
	155	INTEGER(iwp) :: cwy !:
	156	INTEGER(iwp) :: cxl !:
	157	INTEGER(iwp) :: cxr !:
	158	INTEGER(iwp) :: cyn !:
	159	INTEGER(iwp) :: cys !:
	160	INTEGER(iwp) :: gls !:
	161	INTEGER(iwp) :: i !:
	162	INTEGER(iwp) :: ii !:
	163	INTEGER(iwp) :: inc !:
	164	INTEGER(iwp) :: j !:
	165	INTEGER(iwp) :: k !:
	166	INTEGER(iwp) :: l !:
	167	INTEGER(iwp) :: nxl_l !:
	168	INTEGER(iwp) :: nxr_l !:
	169	INTEGER(iwp) :: nyn_l !:
	170	INTEGER(iwp) :: nys_l !:
	171	INTEGER(iwp) :: nzb_si !:
	172	INTEGER(iwp) :: nzt_l !:
	173	INTEGER(iwp) :: vi !:
[1]	174
[1320]	175	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !:
[1]	176
[1320]	177	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !:
	178	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !:
	179	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !:
	180	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !:
	181	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !:
	182	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !:
	183	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !:
	184	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !:
	185	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !:
	186	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !:
[1]	187
[1320]	188	LOGICAL :: flag_set = .FALSE. !:
[861]	189
[1320]	190	REAL(wp) :: dx_l !:
	191	REAL(wp) :: dy_l !:
	192	REAL(wp) :: dz_stretched !:
[1]	193
[1320]	194	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !:
[1]	195
[667]	196
[1]	197	!
[709]	198	!-- Calculation of horizontal array bounds including ghost layers
[667]	199	nxlg = nxl - nbgp
	200	nxrg = nxr + nbgp
	201	nysg = nys - nbgp
	202	nyng = nyn + nbgp
[709]	203
[667]	204	!
[1]	205	!-- Allocate grid arrays
[1353]	206	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	207	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	208
	209	!
	210	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	211	IF ( dz == -1.0_wp ) THEN
[254]	212	message_string = 'missing dz'
	213	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	214	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	215	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	216	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	217	ENDIF
[94]	218
[1]	219	!
[94]	220	!-- Define the vertical grid levels
	221	IF ( .NOT. ocean ) THEN
	222	!
	223	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	224	!-- The second u-level (k=1) corresponds to the top of the
[94]	225	!-- Prandtl-layer.
[667]	226
	227	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	228	zu(0) = 0.0_wp
	229	! zu(0) = - dz * 0.5_wp
[667]	230	ELSE
[1353]	231	zu(0) = - dz * 0.5_wp
[667]	232	ENDIF
[1353]	233	zu(1) = dz * 0.5_wp
[1]	234
[94]	235	dz_stretch_level_index = nzt+1
	236	dz_stretched = dz
	237	DO k = 2, nzt+1
	238	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	239	dz_stretched = dz_stretched * dz_stretch_factor
	240	dz_stretched = MIN( dz_stretched, dz_max )
	241	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	242	ENDIF
	243	zu(k) = zu(k-1) + dz_stretched
	244	ENDDO
[1]	245
	246	!
[94]	247	!-- Compute the w-levels. They are always staggered half-way between the
[843]	248	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	249	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	250	!-- The top w-level is extrapolated linearly.
[1353]	251	zw(0) = 0.0_wp
[94]	252	DO k = 1, nzt
[1353]	253	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	254	ENDDO
[1353]	255	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	256
[94]	257	ELSE
[1]	258	!
[843]	259	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	260	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	261	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	262	!-- w-level are defined at same height, but staggered from the second level.
	263	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	264	zu(nzt+1) = dz * 0.5_wp
	265	zu(nzt) = - dz * 0.5_wp
[94]	266
	267	dz_stretch_level_index = 0
	268	dz_stretched = dz
	269	DO k = nzt-1, 0, -1
	270	IF ( dz_stretch_level <= ABS( zu(k+1) ) .AND. &
	271	dz_stretched < dz_max ) THEN
	272	dz_stretched = dz_stretched * dz_stretch_factor
	273	dz_stretched = MIN( dz_stretched, dz_max )
	274	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	275	ENDIF
	276	zu(k) = zu(k+1) - dz_stretched
	277	ENDDO
	278
	279	!
	280	!-- Compute the w-levels. They are always staggered half-way between the
[843]	281	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	282	!-- at the ground. In this case the first u- and w-level are defined at
	283	!-- same height. The top w-level (nzt+1) is not used but set for
	284	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	285	zw(nzt+1) = dz
[1353]	286	zw(nzt) = 0.0_wp
[94]	287	DO k = 0, nzt
[1353]	288	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	289	ENDDO
	290
[843]	291	!
	292	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	293	!-- at same height.
	294	IF ( ibc_uv_b == 0 ) THEN
	295	zu(0) = zw(0)
	296	ENDIF
	297
[94]	298	ENDIF
	299
	300	!
[1]	301	!-- Compute grid lengths.
	302	DO k = 1, nzt+1
	303	dzu(k) = zu(k) - zu(k-1)
[1353]	304	ddzu(k) = 1.0_wp / dzu(k)
[1]	305	dzw(k) = zw(k) - zw(k-1)
[1353]	306	ddzw(k) = 1.0_wp / dzw(k)
[1]	307	ENDDO
	308
	309	DO k = 1, nzt
[1353]	310	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	311	ENDDO
[667]	312
	313	!
[709]	314	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	315	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	316	!-- is only dz/2, but should be dz. Therefore, an additional array
	317	!-- containing with appropriate grid information is created for these
	318	!-- solvers.
	319	IF ( psolver /= 'multigrid' ) THEN
[667]	320	ALLOCATE( ddzu_pres(1:nzt+1) )
	321	ddzu_pres = ddzu
[864]	322	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	323	ENDIF
[1]	324
	325	!
	326	!-- In case of multigrid method, compute grid lengths and grid factors for the
	327	!-- grid levels
	328	IF ( psolver == 'multigrid' ) THEN
	329
	330	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	331	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	332	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	333	f1_mg(nzb+1:nzt,maximum_grid_level), &
	334	f2_mg(nzb+1:nzt,maximum_grid_level), &
	335	f3_mg(nzb+1:nzt,maximum_grid_level) )
	336
	337	dzu_mg(:,maximum_grid_level) = dzu
[667]	338	!
[864]	339	!-- Next line to ensure an equally spaced grid.
	340	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	341
[1]	342	dzw_mg(:,maximum_grid_level) = dzw
	343	nzt_l = nzt
	344	DO l = maximum_grid_level-1, 1, -1
[1353]	345	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	346	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	347	nzt_l = nzt_l / 2
	348	DO k = 2, nzt_l+1
	349	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	350	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	351	ENDDO
	352	ENDDO
	353
	354	nzt_l = nzt
	355	dx_l = dx
	356	dy_l = dy
	357	DO l = maximum_grid_level, 1, -1
[1353]	358	ddx2_mg(l) = 1.0_wp / dx_l**2
	359	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	360	DO k = nzb+1, nzt_l
[1353]	361	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	362	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	363	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	364	f2_mg(k,l) + f3_mg(k,l)
	365	ENDDO
	366	nzt_l = nzt_l / 2
[1353]	367	dx_l = dx_l * 2.0_wp
	368	dy_l = dy_l * 2.0_wp
[1]	369	ENDDO
	370
	371	ENDIF
	372
	373	!
	374	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	375	ddx = 1.0_wp / dx
	376	ddy = 1.0_wp / dy
[1]	377	dx2 = dx * dx
	378	dy2 = dy * dy
[1353]	379	ddx2 = 1.0_wp / dx2
	380	ddy2 = 1.0_wp / dy2
[1]	381
	382	!
	383	!-- Compute the grid-dependent mixing length.
	384	DO k = 1, nzt
[1322]	385	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	386	ENDDO
	387
	388	!
	389	!-- Allocate outer and inner index arrays for topography and set
[114]	390	!-- defaults.
	391	!-- nzb_local has to contain additional layers of ghost points for calculating
	392	!-- the flag arrays needed for the multigrid method
	393	gls = 2**( maximum_grid_level )
[861]	394	IF ( gls < nbgp ) gls = nbgp
[667]	395
[114]	396	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	397	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	398	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	399	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	400	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	401	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	402	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	403	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	404	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	405	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	406	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	407	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	408	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	409	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	410	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	411	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	412	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	413	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	414	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	415	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	416	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	417	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	418	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	419	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	420	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	421	wall_e_x(nysg:nyng,nxlg:nxrg), &
	422	wall_e_y(nysg:nyng,nxlg:nxrg), &
	423	wall_u(nysg:nyng,nxlg:nxrg), &
	424	wall_v(nysg:nyng,nxlg:nxrg), &
	425	wall_w_x(nysg:nyng,nxlg:nxrg), &
	426	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	427
	428
[667]	429
	430	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	431
[818]	432
[1]	433	nzb_s_inner = nzb; nzb_s_outer = nzb
	434	nzb_u_inner = nzb; nzb_u_outer = nzb
	435	nzb_v_inner = nzb; nzb_v_outer = nzb
	436	nzb_w_inner = nzb; nzb_w_outer = nzb
	437
[1353]	438	rflags_s_inner = 1.0_wp
	439	rflags_invers = 1.0_wp
[1221]	440
[1]	441	!
[19]	442	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	443	!-- form (which does not use surface fluxes) is applied
	444	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	445	nzb_diff = nzb + 2
	446	ELSE
	447	nzb_diff = nzb + 1
	448	ENDIF
[19]	449	IF ( use_top_fluxes ) THEN
	450	nzt_diff = nzt - 1
	451	ELSE
	452	nzt_diff = nzt
	453	ENDIF
[1]	454
	455	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	456	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	457
[1353]	458	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	459	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	460	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	461	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	462
	463	!
	464	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	465	!-- for the moment,
	466	!-- multiplication with wall_adjustment_factor near the end of this routine
	467	l_wall(nzb,:,:) = l_grid(1)
	468	DO k = nzb+1, nzt
	469	l_wall(k,:,:) = l_grid(k)
	470	ENDDO
	471	l_wall(nzt+1,:,:) = l_grid(nzt)
	472
	473	ALLOCATE ( vertical_influence(nzb:nzt) )
	474	DO k = 1, nzt
	475	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	476	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	477	ENDDO
	478
	479	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	480	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	481	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	482	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	483	'threshold given by only local', &
	484	' &horizontal reduction of near_wall ', &
	485	'mixing length l_wall', &
	486	' &starting from height level k = ', k, '.'
	487	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	488	EXIT
	489	ENDIF
	490	ENDDO
	491	vertical_influence(0) = vertical_influence(1)
	492
[667]	493	DO i = nxlg, nxrg
	494	DO j = nysg, nyng
[1]	495	DO k = nzb_s_inner(j,i) + 1, &
	496	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	497	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	498	ENDDO
	499	ENDDO
	500	ENDDO
	501
	502	!
	503	!-- Set outer and inner index arrays for non-flat topography.
	504	!-- Here consistency checks concerning domain size and periodicity are
	505	!-- necessary.
	506	!-- Within this SELECT CASE structure only nzb_local is initialized
	507	!-- individually depending on the chosen topography type, all other index
	508	!-- arrays are initialized further below.
	509	SELECT CASE ( TRIM( topography ) )
	510
	511	CASE ( 'flat' )
	512	!
[555]	513	!-- nzb_local is required for the multigrid solver
	514	nzb_local = 0
[1]	515
	516	CASE ( 'single_building' )
	517	!
	518	!-- Single rectangular building, by default centered in the middle of the
	519	!-- total domain
	520	blx = NINT( building_length_x / dx )
	521	bly = NINT( building_length_y / dy )
	522	bh = NINT( building_height / dz )
	523
[1322]	524	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	525	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	526	ENDIF
	527	bxl = NINT( building_wall_left / dx )
	528	bxr = bxl + blx
	529
[1322]	530	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	531	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	532	ENDIF
	533	bys = NINT( building_wall_south / dy )
	534	byn = bys + bly
	535
	536	!
	537	!-- Building size has to meet some requirements
	538	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	539	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	540	WRITE( message_string, * ) 'inconsistent building parameters:', &
	541	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	542	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	543	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	544	ENDIF
	545
	546	!
[217]	547	!-- Define the building.
[1]	548	nzb_local = 0
[134]	549	nzb_local(bys:byn,bxl:bxr) = bh
[1]	550
[240]	551	CASE ( 'single_street_canyon' )
	552	!
	553	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	554	!-- The canyon is centered in the other direction by default.
[1322]	555	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	556	!
	557	!-- Street canyon in y direction
	558	cwx = NINT( canyon_width_x / dx )
[1322]	559	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	560	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	561	ENDIF
	562	cxl = NINT( canyon_wall_left / dx )
	563	cxr = cxl + cwx
	564
[1322]	565	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	566	!
	567	!-- Street canyon in x direction
	568	cwy = NINT( canyon_width_y / dy )
[1322]	569	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	570	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	571	ENDIF
	572	cys = NINT( canyon_wall_south / dy )
	573	cyn = cys + cwy
	574
	575	ELSE
[254]	576
	577	message_string = 'no street canyon width given'
	578	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	579
[240]	580	ENDIF
	581
	582	ch = NINT( canyon_height / dz )
	583	dp_level_ind_b = ch
	584	!
	585	!-- Street canyon size has to meet some requirements
[1322]	586	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	587	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	588	( ch < 3 ) ) THEN
[1353]	589	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	590	'&cxl=', cxl, 'cxr=', cxr, &
	591	'cwx=', cwx, &
[254]	592	'ch=', ch, 'nx=', nx, 'ny=', ny
	593	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	594	ENDIF
[1322]	595	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	596	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	597	( ch < 3 ) ) THEN
[1353]	598	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	599	'&cys=', cys, 'cyn=', cyn, &
	600	'cwy=', cwy, &
[254]	601	'ch=', ch, 'nx=', nx, 'ny=', ny
	602	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	603	ENDIF
	604	ENDIF
[1353]	605	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	606	canyon_width_y /= 9999999.9_wp ) THEN
	607	message_string = 'inconsistent canyon parameters:' // &
	608	'&street canyon can only be oriented' // &
[254]	609	'&either in x- or in y-direction'
	610	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	611	ENDIF
	612
	613	nzb_local = ch
[1322]	614	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	615	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	616	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	617	nzb_local(cys+1:cyn-1,:) = 0
	618	ENDIF
	619
[1]	620	CASE ( 'read_from_file' )
[759]	621
[818]	622	ALLOCATE ( topo_height(0:ny,0:nx) )
	623
[759]	624	DO ii = 0, io_blocks-1
	625	IF ( ii == io_group ) THEN
	626
[1]	627	!
[759]	628	!-- Arbitrary irregular topography data in PALM format (exactly
	629	!-- matching the grid size and total domain size)
[1069]	630	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	631	FORM='FORMATTED', ERR=10 )
	632	DO j = ny, 0, -1
	633	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	634	ENDDO
	635
	636	GOTO 12
	637
[1069]	638	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	639	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	640
[1069]	641	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	642	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	643
	644	12 CLOSE( 90 )
	645
	646	ENDIF
[809]	647	#if defined( __parallel ) && ! defined ( __check )
[759]	648	CALL MPI_BARRIER( comm2d, ierr )
	649	#endif
[559]	650	ENDDO
[759]	651
[1]	652	!
	653	!-- Calculate the index height of the topography
	654	DO i = 0, nx
	655	DO j = 0, ny
	656	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
	657	ENDDO
	658	ENDDO
[818]	659
	660	DEALLOCATE ( topo_height )
[114]	661	!
[759]	662	!-- Add cyclic boundaries (additional layers are for calculating
	663	!-- flag arrays needed for the multigrid sover)
[114]	664	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	665	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	666	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	667	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	668
[1]	669	CASE DEFAULT
	670	!
	671	!-- The DEFAULT case is reached either if the parameter topography
[217]	672	!-- contains a wrong character string or if the user has defined a special
[1]	673	!-- case in the user interface. There, the subroutine user_init_grid
	674	!-- checks which of these two conditions applies.
[114]	675	CALL user_init_grid( gls, nzb_local )
[1]	676
	677	END SELECT
	678	!
[861]	679	!-- Determine the maximum level of topography. Furthermore it is used for
	680	!-- steering the degradation of order of the applied advection scheme.
[978]	681	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	682	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[861]	683	nzb_max = MAXVAL( nzb_local )
[1353]	684	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[978]	685	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	686	nzb_max = nzt
	687	ENDIF
	688
[861]	689	!
[1]	690	!-- Consistency checks and index array initialization are only required for
[217]	691	!-- non-flat topography, also the initialization of topography height arrays
[49]	692	!-- zu_s_inner and zw_w_inner
[1]	693	IF ( TRIM( topography ) /= 'flat' ) THEN
	694
	695	!
	696	!-- Consistency checks
	697	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	698	WRITE( message_string, * ) 'nzb_local values are outside the', &
	699	'model domain', &
	700	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	701	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	702	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	703	ENDIF
	704
[722]	705	IF ( bc_lr == 'cyclic' ) THEN
[1353]	706	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	707	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	708	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	709	' boundary condition in x-direction'
	710	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	711	ENDIF
	712	ENDIF
[722]	713	IF ( bc_ns == 'cyclic' ) THEN
[1353]	714	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	715	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	716	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	717	' boundary condition in y-direction'
	718	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	719	ENDIF
	720	ENDIF
	721
[217]	722	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	723	!
[217]	724	!-- The array nzb_local as defined using the 'cell_edge' convention
	725	!-- describes the actual total size of topography which is defined at the
	726	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	727	!-- on the topography walls in y-direction. However, PALM uses individual
	728	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	729	!-- Therefore, the extent of topography in nzb_local is now reduced by
	730	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	731	!-- to form the basis for nzb_s_inner.
	732	DO j = -gls, ny + gls
	733	DO i = -gls, nx
	734	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	735	ENDDO
[134]	736	ENDDO
[217]	737	!-- apply cyclic boundary conditions in x-direction
	738	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	739	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	740	DO i = -gls, nx + gls
	741	DO j = -gls, ny
	742	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	743	ENDDO
[134]	744	ENDDO
[217]	745	!-- apply cyclic boundary conditions in y-direction
	746	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	747	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	748	ENDIF
[134]	749
[1]	750	!
	751	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	752	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	753	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	754
	755	!
	756	!-- Initialize remaining index arrays:
	757	!-- first pre-initialize them with nzb_s_inner...
	758	nzb_u_inner = nzb_s_inner
	759	nzb_u_outer = nzb_s_inner
	760	nzb_v_inner = nzb_s_inner
	761	nzb_v_outer = nzb_s_inner
	762	nzb_w_outer = nzb_s_inner
	763	nzb_s_outer = nzb_s_inner
	764
	765	!
	766	!-- ...then extend pre-initialized arrays in their according directions
	767	!-- based on nzb_local using nzb_tmp as a temporary global index array
	768
	769	!
	770	!-- nzb_s_outer:
	771	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	772	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	773	DO j = -1, ny + 1
	774	DO i = 0, nx
[1353]	775	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	776	nzb_local(j,i+1) )
	777	ENDDO
	778	ENDDO
	779	DO i = nxl, nxr
	780	DO j = nys, nyn
[1353]	781	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	782	nzb_tmp(j+1,i) )
	783	ENDDO
	784	!
	785	!-- non-cyclic boundary conditions (overwritten by call of
	786	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	787	IF ( nys == 0 ) THEN
	788	j = -1
	789	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	790	ENDIF
	791	IF ( nys == ny ) THEN
	792	j = ny + 1
	793	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	794	ENDIF
	795	ENDDO
	796	!
	797	!-- nzb_w_outer:
	798	!-- identical to nzb_s_outer
	799	nzb_w_outer = nzb_s_outer
	800
	801	!
	802	!-- nzb_u_inner:
	803	!-- extend nzb_local rightwards only
[667]	804	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	805	DO j = -1, ny + 1
	806	DO i = 0, nx + 1
	807	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	808	ENDDO
	809	ENDDO
[667]	810	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	811
	812	!
	813	!-- nzb_u_outer:
	814	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	815	DO i = nxl, nxr
	816	DO j = nys, nyn
[1353]	817	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	818	nzb_tmp(j+1,i) )
	819	ENDDO
	820	!
	821	!-- non-cyclic boundary conditions (overwritten by call of
	822	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	823	IF ( nys == 0 ) THEN
	824	j = -1
	825	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	826	ENDIF
	827	IF ( nys == ny ) THEN
	828	j = ny + 1
	829	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	830	ENDIF
	831	ENDDO
	832
	833	!
	834	!-- nzb_v_inner:
	835	!-- extend nzb_local northwards only
[667]	836	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	837	DO i = -1, nx + 1
	838	DO j = 0, ny + 1
	839	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	840	ENDDO
	841	ENDDO
[667]	842	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	843
	844	!
	845	!-- nzb_v_outer:
	846	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	847	DO j = nys, nyn
	848	DO i = nxl, nxr
[1353]	849	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	850	nzb_tmp(j,i+1) )
	851	ENDDO
	852	!
	853	!-- non-cyclic boundary conditions (overwritten by call of
	854	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	855	IF ( nxl == 0 ) THEN
	856	i = -1
	857	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	858	ENDIF
	859	IF ( nxr == nx ) THEN
	860	i = nx + 1
	861	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	862	ENDIF
	863	ENDDO
[809]	864	#if ! defined ( __check )
[1]	865	!
	866	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	867	!-- boundary conditions, if applicable.
	868	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	869	!-- they do not require exchange and are not included here.
	870	CALL exchange_horiz_2d_int( nzb_u_inner )
	871	CALL exchange_horiz_2d_int( nzb_u_outer )
	872	CALL exchange_horiz_2d_int( nzb_v_inner )
	873	CALL exchange_horiz_2d_int( nzb_v_outer )
	874	CALL exchange_horiz_2d_int( nzb_w_outer )
	875	CALL exchange_horiz_2d_int( nzb_s_outer )
	876
[49]	877	!
	878	!-- Allocate and set the arrays containing the topography height
	879	IF ( myid == 0 ) THEN
	880
	881	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	882
	883	DO i = 0, nx + 1
	884	DO j = 0, ny + 1
	885	zu_s_inner(i,j) = zu(nzb_local(j,i))
	886	zw_w_inner(i,j) = zw(nzb_local(j,i))
	887	ENDDO
	888	ENDDO
	889
	890	ENDIF
[1221]	891	!
	892	!-- Set flag arrays to be used for masking of grid points
	893	DO i = nxlg, nxrg
	894	DO j = nysg, nyng
	895	DO k = nzb, nzt+1
[1353]	896	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	897	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	898	ENDDO
	899	ENDDO
	900	ENDDO
[807]	901	#endif
[1]	902	ENDIF
	903
[809]	904	#if ! defined ( __check )
[1]	905	!
	906	!-- Preliminary: to be removed after completion of the topography code!
	907	!-- Set the former default k index arrays nzb_2d
	908	nzb_2d = nzb
	909
	910	!
	911	!-- Set the individual index arrays which define the k index from which on
	912	!-- the usual finite difference form (which does not use surface fluxes) is
	913	!-- applied
	914	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	915	nzb_diff_u = nzb_u_inner + 2
	916	nzb_diff_v = nzb_v_inner + 2
	917	nzb_diff_s_inner = nzb_s_inner + 2
	918	nzb_diff_s_outer = nzb_s_outer + 2
	919	ELSE
	920	nzb_diff_u = nzb_u_inner + 1
	921	nzb_diff_v = nzb_v_inner + 1
	922	nzb_diff_s_inner = nzb_s_inner + 1
	923	nzb_diff_s_outer = nzb_s_outer + 1
	924	ENDIF
	925
	926	!
	927	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	928	!-- for limitation of near-wall mixing length l_wall further below
	929	corner_nl = 0
	930	corner_nr = 0
	931	corner_sl = 0
	932	corner_sr = 0
	933	wall_l = 0
	934	wall_n = 0
	935	wall_r = 0
	936	wall_s = 0
	937
	938	DO i = nxl, nxr
	939	DO j = nys, nyn
	940	!
	941	!-- u-component
	942	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	943	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	944	fym(j,i) = 0.0_wp
	945	fyp(j,i) = 1.0_wp
[1]	946	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	947	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	948	fym(j,i) = 1.0_wp
	949	fyp(j,i) = 0.0_wp
[1]	950	ENDIF
	951	!
	952	!-- v-component
	953	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	954	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	955	fxm(j,i) = 0.0_wp
	956	fxp(j,i) = 1.0_wp
[1]	957	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	958	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	959	fxm(j,i) = 1.0_wp
	960	fxp(j,i) = 0.0_wp
[1]	961	ENDIF
	962	!
	963	!-- w-component, also used for scalars, separate arrays for shear
	964	!-- production of tke
	965	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	966	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	967	wall_w_y(j,i) = 1.0_wp
	968	fwym(j,i) = 0.0_wp
	969	fwyp(j,i) = 1.0_wp
[1]	970	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	971	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	972	wall_w_y(j,i) = 1.0_wp
	973	fwym(j,i) = 1.0_wp
	974	fwyp(j,i) = 0.0_wp
[1]	975	ENDIF
	976	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	977	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	978	wall_w_x(j,i) = 1.0_wp
	979	fwxm(j,i) = 0.0_wp
	980	fwxp(j,i) = 1.0_wp
[1]	981	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	982	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	983	wall_w_x(j,i) = 1.0_wp
	984	fwxm(j,i) = 1.0_wp
	985	fwxp(j,i) = 0.0_wp
[1]	986	ENDIF
	987	!
	988	!-- Wall and corner locations inside buildings for limitation of
	989	!-- near-wall mixing length l_wall
	990	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	991
	992	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	993
	994	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	995	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	996	nzb_s_inner(j,i-1) ) + 1
	997	ENDIF
	998
	999	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1000	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1001	nzb_s_inner(j,i+1) ) + 1
	1002	ENDIF
	1003
	1004	ENDIF
	1005
	1006	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1007
	1008	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1009	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1010	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1011	nzb_s_inner(j,i-1) ) + 1
	1012	ENDIF
	1013
	1014	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1015	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1016	nzb_s_inner(j,i+1) ) + 1
	1017	ENDIF
	1018
	1019	ENDIF
	1020
	1021	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1022	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1023	ENDIF
	1024
	1025	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1026	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1027	ENDIF
	1028
	1029	ENDDO
	1030	ENDDO
	1031
	1032	!
[114]	1033	!-- Calculate wall flag arrays for the multigrid method
	1034	IF ( psolver == 'multigrid' ) THEN
	1035	!
	1036	!-- Gridpoint increment of the current level
	1037	inc = 1
	1038
	1039	DO l = maximum_grid_level, 1 , -1
	1040
	1041	nxl_l = nxl_mg(l)
	1042	nxr_l = nxr_mg(l)
	1043	nys_l = nys_mg(l)
	1044	nyn_l = nyn_mg(l)
	1045	nzt_l = nzt_mg(l)
	1046
	1047	!
	1048	!-- Assign the flag level to be calculated
	1049	SELECT CASE ( l )
	1050	CASE ( 1 )
	1051	flags => wall_flags_1
	1052	CASE ( 2 )
	1053	flags => wall_flags_2
	1054	CASE ( 3 )
	1055	flags => wall_flags_3
	1056	CASE ( 4 )
	1057	flags => wall_flags_4
	1058	CASE ( 5 )
	1059	flags => wall_flags_5
	1060	CASE ( 6 )
	1061	flags => wall_flags_6
	1062	CASE ( 7 )
	1063	flags => wall_flags_7
	1064	CASE ( 8 )
	1065	flags => wall_flags_8
	1066	CASE ( 9 )
	1067	flags => wall_flags_9
	1068	CASE ( 10 )
	1069	flags => wall_flags_10
	1070	END SELECT
	1071
	1072	!
	1073	!-- Depending on the grid level, set the respective bits in case of
	1074	!-- neighbouring walls
	1075	!-- Bit 0: wall to the bottom
	1076	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1077	!-- Bit 2: wall to the south
	1078	!-- Bit 3: wall to the north
	1079	!-- Bit 4: wall to the left
	1080	!-- Bit 5: wall to the right
[116]	1081	!-- Bit 6: inside building
[114]	1082
	1083	flags = 0
	1084
[927]	1085	!
	1086	!-- In case of masking method, flags are not set and multigrid method
	1087	!-- works like FFT-solver
	1088	IF ( .NOT. masking_method ) THEN
	1089
	1090	DO i = nxl_l-1, nxr_l+1
	1091	DO j = nys_l-1, nyn_l+1
	1092	DO k = nzb, nzt_l+1
[114]	1093
	1094	!
[927]	1095	!-- Inside/outside building (inside building does not need
	1096	!-- further tests for walls)
	1097	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1098
[927]	1099	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1100
[927]	1101	ELSE
[114]	1102	!
[927]	1103	!-- Bottom wall
	1104	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1105	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1106	ENDIF
[114]	1107	!
[927]	1108	!-- South wall
	1109	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1110	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1111	ENDIF
[114]	1112	!
[927]	1113	!-- North wall
	1114	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1115	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1116	ENDIF
[114]	1117	!
[927]	1118	!-- Left wall
	1119	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1120	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1121	ENDIF
[114]	1122	!
[927]	1123	!-- Right wall
	1124	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1125	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1126	ENDIF
	1127
[114]	1128	ENDIF
	1129
[927]	1130	ENDDO
[114]	1131	ENDDO
	1132	ENDDO
	1133
[927]	1134	ENDIF
	1135
[114]	1136	!
	1137	!-- Test output of flag arrays
[145]	1138	! i = nxl_l
	1139	! WRITE (9,*) ' '
	1140	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1141	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1142	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1143	! DO k = nzt_l+1, nzb, -1
	1144	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1145	! ENDDO
[114]	1146
	1147	inc = inc * 2
	1148
	1149	ENDDO
	1150
	1151	ENDIF
[861]	1152	!
	1153	!-- Allocate flags needed for masking walls.
[1221]	1154	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr), &
	1155	wall_flags_00(nzb:nzt,nys:nyn,nxl:nxr) )
	1156	wall_flags_0 = 0
	1157	wall_flags_00 = 0
[114]	1158
[861]	1159	IF ( scalar_advec == 'ws-scheme' ) THEN
[114]	1160	!
[861]	1161	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1162	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1163	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1164	!-- grid points.
	1165	DO i = nxl, nxr
	1166	DO j = nys, nyn
	1167	DO k = nzb_s_inner(j,i)+1, nzt
	1168	!
	1169	!-- scalar - x-direction
	1170	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1171	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1172	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1173	.AND. i == nxr ) ) THEN
[861]	1174	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1175	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1176	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1177	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1178	) THEN
[861]	1179	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1180	ELSE
	1181	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1182	ENDIF
	1183	!
	1184	!-- scalar - y-direction
	1185	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1186	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1187	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1188	.AND. j == nyn ) ) THEN
[861]	1189	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1190	!-- WS3
	1191	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1192	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1193	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1194	) THEN
[861]	1195	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1196	!-- WS5
	1197	ELSE
	1198	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1199	ENDIF
	1200	!
	1201	!-- scalar - z-direction
	1202	!-- WS1 (6), WS3 (7), WS5 (8)
	1203	flag_set = .FALSE.
	1204	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1205	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1206	flag_set = .TRUE.
	1207	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1208	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1209	flag_set = .TRUE.
	1210	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1211	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1212	ENDIF
	1213	ENDDO
	1214	ENDDO
	1215	ENDDO
	1216	ENDIF
	1217
	1218	IF ( momentum_advec == 'ws-scheme' ) THEN
	1219	!
	1220	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1221	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1222	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1223	!-- grid points.
	1224	DO i = nxl, nxr
	1225	DO j = nys, nyn
	1226	DO k = nzb_u_inner(j,i)+1, nzt
	1227	!
	1228	!-- u component - x-direction
	1229	!-- WS1 (9), WS3 (10), WS5 (11)
	1230	IF ( k <= nzb_u_inner(j,i+1) &
[978]	1231	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1232	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1233	) THEN
[861]	1234	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1235	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1236	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1237	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1238	) THEN
[861]	1239	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
	1240	ELSE
	1241	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
	1242	ENDIF
[978]	1243
[861]	1244	!
	1245	!-- u component - y-direction
	1246	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1247	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1248	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1249	.AND. j == nyn ) ) THEN
[861]	1250	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1251	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1252	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1253	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1254	) THEN
[861]	1255	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
	1256	ELSE
	1257	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
	1258	ENDIF
	1259	!
	1260	!-- u component - z-direction
	1261	!-- WS1 (15), WS3 (16), WS5 (17)
	1262	flag_set = .FALSE.
	1263	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1264	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1265	flag_set = .TRUE.
	1266	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1267	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1268	flag_set = .TRUE.
	1269	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1270	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1271	ENDIF
	1272
	1273	ENDDO
	1274	ENDDO
	1275	ENDDO
	1276
	1277	DO i = nxl, nxr
	1278	DO j = nys, nyn
	1279	DO k = nzb_v_inner(j,i)+1, nzt
	1280	!
	1281	!-- v component - x-direction
	1282	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1283	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1284	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1285	.AND. i == nxr ) ) THEN
[861]	1286	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1287	!-- WS3
	1288	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1289	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1290	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1291	) THEN
[861]	1292	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
	1293	ELSE
	1294	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
	1295	ENDIF
	1296	!
	1297	!-- v component - y-direction
	1298	!-- WS1 (21), WS3 (22), WS5 (23)
	1299	IF ( k <= nzb_v_inner(j+1,i) &
[978]	1300	.OR. ( ( inflow_s .OR. outflow_s ) .AND. i == nysv ) &
	1301	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1302	) THEN
[861]	1303	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1304	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1305	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1306	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1307	) THEN
[861]	1308	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
	1309	ELSE
	1310	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
	1311	ENDIF
	1312	!
	1313	!-- v component - z-direction
	1314	!-- WS1 (24), WS3 (25), WS5 (26)
	1315	flag_set = .FALSE.
	1316	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1317	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1318	flag_set = .TRUE.
	1319	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1320	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1321	flag_set = .TRUE.
	1322	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1323	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1324	ENDIF
	1325
	1326	ENDDO
	1327	ENDDO
	1328	ENDDO
	1329	DO i = nxl, nxr
	1330	DO j = nys, nyn
[1015]	1331	DO k = nzb_w_inner(j,i), nzt
[861]	1332	!
	1333	!-- w component - x-direction
	1334	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1335	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1336	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1337	.AND. i == nxr ) ) THEN
[861]	1338	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1339	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1340	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1341	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1342	) THEN
[861]	1343	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
	1344	ELSE
	1345	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
	1346	ENDIF
	1347	!
	1348	!-- w component - y-direction
	1349	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1350	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1351	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1352	.AND. j == nyn ) ) THEN
[861]	1353	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1354	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1355	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1356	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1357	) THEN
[861]	1358	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
	1359	ELSE
[1221]	1360	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[861]	1361	ENDIF
	1362	!
	1363	!-- w component - z-direction
	1364	!-- WS1 (33), WS3 (34), WS5 (35)
	1365	flag_set = .FALSE.
	1366	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1367	.OR. k == nzt ) THEN
	1368	!
	1369	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1370	!-- set, although this is not a prognostic level. However,
	1371	!-- contrary to the advection of u,v and s this is necessary
	1372	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1373	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1374	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1375	flag_set = .TRUE.
	1376	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1377	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1378	flag_set = .TRUE.
	1379	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1380	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1381	ENDIF
	1382
	1383	ENDDO
	1384	ENDDO
	1385	ENDDO
	1386
	1387	ENDIF
	1388
	1389	!
[1]	1390	!-- In case of topography: limit near-wall mixing length l_wall further:
	1391	!-- Go through all points of the subdomain one by one and look for the closest
	1392	!-- surface
	1393	IF ( TRIM(topography) /= 'flat' ) THEN
	1394	DO i = nxl, nxr
	1395	DO j = nys, nyn
	1396
	1397	nzb_si = nzb_s_inner(j,i)
	1398	vi = vertical_influence(nzb_si)
	1399
	1400	IF ( wall_n(j,i) > 0 ) THEN
	1401	!
	1402	!-- North wall (y distance)
	1403	DO k = wall_n(j,i), nzb_si
[1353]	1404	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1405	ENDDO
	1406	!
	1407	!-- Above North wall (yz distance)
	1408	DO k = nzb_si + 1, nzb_si + vi
[1353]	1409	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1410	SQRT( 0.25_wp * dy**2 + &
[1]	1411	( zu(k) - zw(nzb_si) )**2 ) )
	1412	ENDDO
	1413	!
	1414	!-- Northleft corner (xy distance)
	1415	IF ( corner_nl(j,i) > 0 ) THEN
	1416	DO k = corner_nl(j,i), nzb_si
	1417	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1418	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1419	ENDDO
	1420	!
	1421	!-- Above Northleft corner (xyz distance)
	1422	DO k = nzb_si + 1, nzb_si + vi
[1353]	1423	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1424	SQRT( 0.25_wp * (dx2 + dy2) + &
	1425	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1426	ENDDO
	1427	ENDIF
	1428	!
	1429	!-- Northright corner (xy distance)
	1430	IF ( corner_nr(j,i) > 0 ) THEN
	1431	DO k = corner_nr(j,i), nzb_si
[1353]	1432	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1433	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1434	ENDDO
	1435	!
	1436	!-- Above northright corner (xyz distance)
	1437	DO k = nzb_si + 1, nzb_si + vi
[1353]	1438	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1439	SQRT( 0.25_wp * (dx2 + dy2) + &
	1440	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1441	ENDDO
	1442	ENDIF
	1443	ENDIF
	1444
	1445	IF ( wall_s(j,i) > 0 ) THEN
	1446	!
	1447	!-- South wall (y distance)
	1448	DO k = wall_s(j,i), nzb_si
[1353]	1449	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1450	ENDDO
	1451	!
	1452	!-- Above south wall (yz distance)
[1353]	1453	DO k = nzb_si + 1, nzb_si + vi
	1454	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1455	SQRT( 0.25_wp * dy**2 + &
[1]	1456	( zu(k) - zw(nzb_si) )**2 ) )
	1457	ENDDO
	1458	!
	1459	!-- Southleft corner (xy distance)
	1460	IF ( corner_sl(j,i) > 0 ) THEN
	1461	DO k = corner_sl(j,i), nzb_si
[1353]	1462	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1463	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1464	ENDDO
	1465	!
	1466	!-- Above southleft corner (xyz distance)
	1467	DO k = nzb_si + 1, nzb_si + vi
[1353]	1468	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1469	SQRT( 0.25_wp * (dx2 + dy2) + &
	1470	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1471	ENDDO
	1472	ENDIF
	1473	!
	1474	!-- Southright corner (xy distance)
	1475	IF ( corner_sr(j,i) > 0 ) THEN
	1476	DO k = corner_sr(j,i), nzb_si
[1353]	1477	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1478	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1479	ENDDO
	1480	!
	1481	!-- Above southright corner (xyz distance)
	1482	DO k = nzb_si + 1, nzb_si + vi
[1353]	1483	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1484	SQRT( 0.25_wp * (dx2 + dy2) + &
	1485	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1486	ENDDO
	1487	ENDIF
	1488
	1489	ENDIF
	1490
	1491	IF ( wall_l(j,i) > 0 ) THEN
	1492	!
	1493	!-- Left wall (x distance)
	1494	DO k = wall_l(j,i), nzb_si
[1353]	1495	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1496	ENDDO
	1497	!
	1498	!-- Above left wall (xz distance)
	1499	DO k = nzb_si + 1, nzb_si + vi
[1353]	1500	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1501	SQRT( 0.25_wp * dx**2 + &
	1502	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1503	ENDDO
	1504	ENDIF
	1505
	1506	IF ( wall_r(j,i) > 0 ) THEN
	1507	!
	1508	!-- Right wall (x distance)
	1509	DO k = wall_r(j,i), nzb_si
[1353]	1510	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1511	ENDDO
	1512	!
	1513	!-- Above right wall (xz distance)
	1514	DO k = nzb_si + 1, nzb_si + vi
[1353]	1515	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1516	SQRT( 0.25_wp * dx**2 + &
[1]	1517	( zu(k) - zw(nzb_si) )**2 ) )
	1518	ENDDO
	1519
	1520	ENDIF
	1521
	1522	ENDDO
	1523	ENDDO
	1524
	1525	ENDIF
	1526
	1527	!
	1528	!-- Multiplication with wall_adjustment_factor
	1529	l_wall = wall_adjustment_factor * l_wall
	1530
	1531	!
[709]	1532	!-- Set lateral boundary conditions for l_wall
[667]	1533	CALL exchange_horiz( l_wall, nbgp )
	1534
[1]	1535	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1536	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1537
[807]	1538	#endif
[1]	1539
	1540	END SUBROUTINE init_grid

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