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source: palm/trunk/SOURCE/init_grid.f90 @ 986

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

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