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source: palm/trunk/SOURCE/init_grid.f90 @ 345

Last change on this file since 345 was 274, checked in by heinze, 16 years ago
Indentation of the message calls corrected
Property svn:keywords set to `Id`
File size: 39.6 KB

Rev	Line
[1]	1	SUBROUTINE init_grid
	2
	3	!------------------------------------------------------------------------------!
[254]	4	! Current revisions:
[1]	5	! -----------------
[254]	6	! Output of messages replaced by message handling routine.
[240]	7	! new topography case 'single_street_canyon'
[139]	8	!
	9	! Former revisions:
	10	! -----------------
	11	! $Id: init_grid.f90 274 2009-03-26 15:11:21Z heinze $
	12	!
[226]	13	! 217 2008-12-09 18:00:48Z letzel
	14	! +topography_grid_convention
	15	!
[139]	16	! 134 2007-11-21 07:28:38Z letzel
[134]	17	! Redefine initial nzb_local as the actual total size of topography (later the
	18	! extent of topography in nzb_local is reduced by 1dx at the E topography walls
	19	! and by 1dy at the N topography walls to form the basis for nzb_s_inner);
	20	! for consistency redefine 'single_building' case.
[114]	21	! Calculation of wall flag arrays
[1]	22	!
[98]	23	! 94 2007-06-01 15:25:22Z raasch
	24	! Grid definition for ocean version
	25	!
[77]	26	! 75 2007-03-22 09:54:05Z raasch
	27	! storage of topography height arrays zu_s_inner and zw_s_inner,
	28	! 2nd+3rd argument removed from exchange horiz
	29	!
[39]	30	! 19 2007-02-23 04:53:48Z raasch
	31	! Setting of nzt_diff
	32	!
[3]	33	! RCS Log replace by Id keyword, revision history cleaned up
	34	!
[1]	35	! Revision 1.17 2006/08/22 14:00:05 raasch
	36	! +dz_max to limit vertical stretching,
	37	! bugfix in index array initialization for line- or point-like topography
	38	! structures
	39	!
	40	! Revision 1.1 1997/08/11 06:17:45 raasch
	41	! Initial revision (Testversion)
	42	!
	43	!
	44	! Description:
	45	! ------------
	46	! Creating grid depending constants
	47	!------------------------------------------------------------------------------!
	48
	49	USE arrays_3d
	50	USE control_parameters
	51	USE grid_variables
	52	USE indices
	53	USE pegrid
	54
	55	IMPLICIT NONE
	56
[240]	57	INTEGER :: bh, blx, bly, bxl, bxr, byn, bys, ch, cwx, cwy, cxl, cxr, cyn, &
	58	cys, gls, i, inc, i_center, j, j_center, k, l, nxl_l, nxr_l, &
	59	nyn_l, nys_l, nzb_si, nzt_l, vi
[1]	60
	61	INTEGER, DIMENSION(:), ALLOCATABLE :: vertical_influence
	62
	63	INTEGER, DIMENSION(:,:), ALLOCATABLE :: corner_nl, corner_nr, corner_sl, &
	64	corner_sr, wall_l, wall_n, wall_r,&
	65	wall_s, nzb_local, nzb_tmp
	66
	67	REAL :: dx_l, dy_l, dz_stretched
	68
	69	REAL, DIMENSION(0:ny,0:nx) :: topo_height
	70
	71	REAL, DIMENSION(:,:,:), ALLOCATABLE :: distance
	72
	73	!
	74	!-- Allocate grid arrays
	75	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
	76	dzw(1:nzt+1), l_grid(1:nzt), zu(0:nzt+1), zw(0:nzt+1) )
	77
	78	!
	79	!-- Compute height of u-levels from constant grid length and dz stretch factors
	80	IF ( dz == -1.0 ) THEN
[254]	81	message_string = 'missing dz'
	82	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1]	83	ELSEIF ( dz <= 0.0 ) THEN
[254]	84	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	85	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	86	ENDIF
[94]	87
[1]	88	!
[94]	89	!-- Define the vertical grid levels
	90	IF ( .NOT. ocean ) THEN
	91	!
	92	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
	93	!-- Since the w-level lies on the surface, the first u-level (staggered!)
	94	!-- lies below the surface (used for "mirror" boundary condition).
	95	!-- The first u-level above the surface corresponds to the top of the
	96	!-- Prandtl-layer.
	97	zu(0) = - dz * 0.5
	98	zu(1) = dz * 0.5
[1]	99
[94]	100	dz_stretch_level_index = nzt+1
	101	dz_stretched = dz
	102	DO k = 2, nzt+1
	103	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	104	dz_stretched = dz_stretched * dz_stretch_factor
	105	dz_stretched = MIN( dz_stretched, dz_max )
	106	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	107	ENDIF
	108	zu(k) = zu(k-1) + dz_stretched
	109	ENDDO
[1]	110
	111	!
[94]	112	!-- Compute the w-levels. They are always staggered half-way between the
	113	!-- corresponding u-levels. The top w-level is extrapolated linearly.
	114	zw(0) = 0.0
	115	DO k = 1, nzt
	116	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	117	ENDDO
	118	zw(nzt+1) = zw(nzt) + 2.0 * ( zu(nzt+1) - zw(nzt) )
[1]	119
[94]	120	ELSE
[1]	121	!
[94]	122	!-- Grid for ocean with solid surface at z=0 (k=0, w-grid). The free water
	123	!-- surface is at k=nzt (w-grid).
	124	!-- Since the w-level lies always on the surface, the first/last u-level
	125	!-- (staggered!) lies below the bottom surface / above the free surface.
	126	!-- It is used for "mirror" boundary condition.
	127	!-- The first u-level above the bottom surface corresponds to the top of the
	128	!-- Prandtl-layer.
	129	zu(nzt+1) = dz * 0.5
	130	zu(nzt) = - dz * 0.5
	131
	132	dz_stretch_level_index = 0
	133	dz_stretched = dz
	134	DO k = nzt-1, 0, -1
	135	IF ( dz_stretch_level <= ABS( zu(k+1) ) .AND. &
	136	dz_stretched < dz_max ) THEN
	137	dz_stretched = dz_stretched * dz_stretch_factor
	138	dz_stretched = MIN( dz_stretched, dz_max )
	139	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	140	ENDIF
	141	zu(k) = zu(k+1) - dz_stretched
	142	ENDDO
	143
	144	!
	145	!-- Compute the w-levels. They are always staggered half-way between the
	146	!-- corresponding u-levels.
	147	!-- The top w-level (nzt+1) is not used but set for consistency, since
	148	!-- w and all scalar variables are defined up tp nzt+1.
	149	zw(nzt+1) = dz
	150	zw(nzt) = 0.0
	151	DO k = 0, nzt
	152	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	153	ENDDO
	154
	155	ENDIF
	156
	157	!
[1]	158	!-- Compute grid lengths.
	159	DO k = 1, nzt+1
	160	dzu(k) = zu(k) - zu(k-1)
	161	ddzu(k) = 1.0 / dzu(k)
	162	dzw(k) = zw(k) - zw(k-1)
	163	ddzw(k) = 1.0 / dzw(k)
	164	ENDDO
	165
	166	DO k = 1, nzt
	167	dd2zu(k) = 1.0 / ( dzu(k) + dzu(k+1) )
	168	ENDDO
	169
	170	!
	171	!-- In case of multigrid method, compute grid lengths and grid factors for the
	172	!-- grid levels
	173	IF ( psolver == 'multigrid' ) THEN
	174
	175	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	176	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	177	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	178	f1_mg(nzb+1:nzt,maximum_grid_level), &
	179	f2_mg(nzb+1:nzt,maximum_grid_level), &
	180	f3_mg(nzb+1:nzt,maximum_grid_level) )
	181
	182	dzu_mg(:,maximum_grid_level) = dzu
	183	dzw_mg(:,maximum_grid_level) = dzw
	184	nzt_l = nzt
	185	DO l = maximum_grid_level-1, 1, -1
	186	dzu_mg(nzb+1,l) = 2.0 * dzu_mg(nzb+1,l+1)
	187	dzw_mg(nzb+1,l) = 2.0 * dzw_mg(nzb+1,l+1)
	188	nzt_l = nzt_l / 2
	189	DO k = 2, nzt_l+1
	190	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	191	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	192	ENDDO
	193	ENDDO
	194
	195	nzt_l = nzt
	196	dx_l = dx
	197	dy_l = dy
	198	DO l = maximum_grid_level, 1, -1
	199	ddx2_mg(l) = 1.0 / dx_l**2
	200	ddy2_mg(l) = 1.0 / dy_l**2
	201	DO k = nzb+1, nzt_l
	202	f2_mg(k,l) = 1.0 / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	203	f3_mg(k,l) = 1.0 / ( dzu_mg(k,l) * dzw_mg(k,l) )
	204	f1_mg(k,l) = 2.0 * ( ddx2_mg(l) + ddy2_mg(l) ) + &
	205	f2_mg(k,l) + f3_mg(k,l)
	206	ENDDO
	207	nzt_l = nzt_l / 2
	208	dx_l = dx_l * 2.0
	209	dy_l = dy_l * 2.0
	210	ENDDO
	211
	212	ENDIF
	213
	214	!
	215	!-- Compute the reciprocal values of the horizontal grid lengths.
	216	ddx = 1.0 / dx
	217	ddy = 1.0 / dy
	218	dx2 = dx * dx
	219	dy2 = dy * dy
	220	ddx2 = 1.0 / dx2
	221	ddy2 = 1.0 / dy2
	222
	223	!
	224	!-- Compute the grid-dependent mixing length.
	225	DO k = 1, nzt
	226	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333
	227	ENDDO
	228
	229	!
	230	!-- Allocate outer and inner index arrays for topography and set
[114]	231	!-- defaults.
	232	!-- nzb_local has to contain additional layers of ghost points for calculating
	233	!-- the flag arrays needed for the multigrid method
	234	gls = 2**( maximum_grid_level )
	235	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	236	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
	237	nzb_local(-gls:ny+gls,-gls:nx+gls), nzb_tmp(-1:ny+1,-1:nx+1), &
	238	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	239	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
	240	ALLOCATE( fwxm(nys-1:nyn+1,nxl-1:nxr+1), fwxp(nys-1:nyn+1,nxl-1:nxr+1), &
	241	fwym(nys-1:nyn+1,nxl-1:nxr+1), fwyp(nys-1:nyn+1,nxl-1:nxr+1), &
	242	fxm(nys-1:nyn+1,nxl-1:nxr+1), fxp(nys-1:nyn+1,nxl-1:nxr+1), &
	243	fym(nys-1:nyn+1,nxl-1:nxr+1), fyp(nys-1:nyn+1,nxl-1:nxr+1), &
	244	nzb_s_inner(nys-1:nyn+1,nxl-1:nxr+1), &
	245	nzb_s_outer(nys-1:nyn+1,nxl-1:nxr+1), &
	246	nzb_u_inner(nys-1:nyn+1,nxl-1:nxr+1), &
	247	nzb_u_outer(nys-1:nyn+1,nxl-1:nxr+1), &
	248	nzb_v_inner(nys-1:nyn+1,nxl-1:nxr+1), &
	249	nzb_v_outer(nys-1:nyn+1,nxl-1:nxr+1), &
	250	nzb_w_inner(nys-1:nyn+1,nxl-1:nxr+1), &
	251	nzb_w_outer(nys-1:nyn+1,nxl-1:nxr+1), &
	252	nzb_diff_s_inner(nys-1:nyn+1,nxl-1:nxr+1), &
	253	nzb_diff_s_outer(nys-1:nyn+1,nxl-1:nxr+1), &
	254	nzb_diff_u(nys-1:nyn+1,nxl-1:nxr+1), &
	255	nzb_diff_v(nys-1:nyn+1,nxl-1:nxr+1), &
	256	nzb_2d(nys-1:nyn+1,nxl-1:nxr+1), &
	257	wall_e_x(nys-1:nyn+1,nxl-1:nxr+1), &
	258	wall_e_y(nys-1:nyn+1,nxl-1:nxr+1), &
	259	wall_u(nys-1:nyn+1,nxl-1:nxr+1), &
	260	wall_v(nys-1:nyn+1,nxl-1:nxr+1), &
	261	wall_w_x(nys-1:nyn+1,nxl-1:nxr+1), &
	262	wall_w_y(nys-1:nyn+1,nxl-1:nxr+1) )
	263
	264	ALLOCATE( l_wall(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
	265
	266	nzb_s_inner = nzb; nzb_s_outer = nzb
	267	nzb_u_inner = nzb; nzb_u_outer = nzb
	268	nzb_v_inner = nzb; nzb_v_outer = nzb
	269	nzb_w_inner = nzb; nzb_w_outer = nzb
	270
	271	!
[19]	272	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	273	!-- form (which does not use surface fluxes) is applied
	274	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	275	nzb_diff = nzb + 2
	276	ELSE
	277	nzb_diff = nzb + 1
	278	ENDIF
[19]	279	IF ( use_top_fluxes ) THEN
	280	nzt_diff = nzt - 1
	281	ELSE
	282	nzt_diff = nzt
	283	ENDIF
[1]	284
	285	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	286	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	287
	288	wall_e_x = 0.0; wall_e_y = 0.0; wall_u = 0.0; wall_v = 0.0
	289	wall_w_x = 0.0; wall_w_y = 0.0
	290	fwxp = 1.0; fwxm = 1.0; fwyp = 1.0; fwym = 1.0
	291	fxp = 1.0; fxm = 1.0; fyp = 1.0; fym = 1.0
	292
	293	!
	294	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	295	!-- for the moment,
	296	!-- multiplication with wall_adjustment_factor near the end of this routine
	297	l_wall(nzb,:,:) = l_grid(1)
	298	DO k = nzb+1, nzt
	299	l_wall(k,:,:) = l_grid(k)
	300	ENDDO
	301	l_wall(nzt+1,:,:) = l_grid(nzt)
	302
	303	ALLOCATE ( vertical_influence(nzb:nzt) )
	304	DO k = 1, nzt
	305	vertical_influence(k) = MIN ( INT( l_grid(k) / &
	306	( wall_adjustment_factor * dzw(k) ) + 0.5 ), nzt - k )
	307	ENDDO
	308
	309	DO k = 1, MAXVAL( nzb_s_inner )
	310	IF ( l_grid(k) > 1.5 * dx * wall_adjustment_factor .OR. &
	311	l_grid(k) > 1.5 * dy * wall_adjustment_factor ) THEN
[254]	312	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	313	'threshold given by only local', &
	314	' &horizontal reduction of near_wall ', &
	315	'mixing length l_wall', &
	316	' &starting from height level k = ', k, '.'
	317	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	318	EXIT
	319	ENDIF
	320	ENDDO
	321	vertical_influence(0) = vertical_influence(1)
	322
	323	DO i = nxl-1, nxr+1
	324	DO j = nys-1, nyn+1
	325	DO k = nzb_s_inner(j,i) + 1, &
	326	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	327	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	328	ENDDO
	329	ENDDO
	330	ENDDO
	331
	332	!
	333	!-- Set outer and inner index arrays for non-flat topography.
	334	!-- Here consistency checks concerning domain size and periodicity are
	335	!-- necessary.
	336	!-- Within this SELECT CASE structure only nzb_local is initialized
	337	!-- individually depending on the chosen topography type, all other index
	338	!-- arrays are initialized further below.
	339	SELECT CASE ( TRIM( topography ) )
	340
	341	CASE ( 'flat' )
	342	!
	343	!-- No actions necessary
	344
	345	CASE ( 'single_building' )
	346	!
	347	!-- Single rectangular building, by default centered in the middle of the
	348	!-- total domain
	349	blx = NINT( building_length_x / dx )
	350	bly = NINT( building_length_y / dy )
	351	bh = NINT( building_height / dz )
	352
	353	IF ( building_wall_left == 9999999.9 ) THEN
	354	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	355	ENDIF
	356	bxl = NINT( building_wall_left / dx )
	357	bxr = bxl + blx
	358
	359	IF ( building_wall_south == 9999999.9 ) THEN
	360	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	361	ENDIF
	362	bys = NINT( building_wall_south / dy )
	363	byn = bys + bly
	364
	365	!
	366	!-- Building size has to meet some requirements
	367	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	368	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	369	WRITE( message_string, * ) 'inconsistent building parameters:', &
	370	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	371	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	372	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	373	ENDIF
	374
	375	!
[217]	376	!-- Define the building.
[1]	377	nzb_local = 0
[134]	378	nzb_local(bys:byn,bxl:bxr) = bh
[1]	379
[240]	380	CASE ( 'single_street_canyon' )
	381	!
	382	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	383	!-- The canyon is centered in the other direction by default.
	384	IF ( canyon_width_x /= 9999999.9 ) THEN
	385	!
	386	!-- Street canyon in y direction
	387	cwx = NINT( canyon_width_x / dx )
	388	IF ( canyon_wall_left == 9999999.9 ) THEN
	389	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	390	ENDIF
	391	cxl = NINT( canyon_wall_left / dx )
	392	cxr = cxl + cwx
	393
	394	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	395	!
	396	!-- Street canyon in x direction
	397	cwy = NINT( canyon_width_y / dy )
	398	IF ( canyon_wall_south == 9999999.9 ) THEN
	399	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	400	ENDIF
	401	cys = NINT( canyon_wall_south / dy )
	402	cyn = cys + cwy
	403
	404	ELSE
[254]	405
	406	message_string = 'no street canyon width given'
	407	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	408
[240]	409	ENDIF
	410
	411	ch = NINT( canyon_height / dz )
	412	dp_level_ind_b = ch
	413	!
	414	!-- Street canyon size has to meet some requirements
	415	IF ( canyon_width_x /= 9999999.9 ) THEN
	416	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
	417	( ch < 3 ) ) THEN
[254]	418	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	419	'&cxl=', cxl, 'cxr=', cxr, &
	420	'cwx=', cwx, &
[254]	421	'ch=', ch, 'nx=', nx, 'ny=', ny
	422	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	423	ENDIF
	424	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	425	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
	426	( ch < 3 ) ) THEN
[254]	427	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	428	'&cys=', cys, 'cyn=', cyn, &
	429	'cwy=', cwy, &
[254]	430	'ch=', ch, 'nx=', nx, 'ny=', ny
	431	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	432	ENDIF
	433	ENDIF
[274]	434	IF ( canyon_width_x /= 9999999.9 .AND. canyon_width_y /= 9999999.9 ) &
[240]	435	THEN
[274]	436	message_string = 'inconsistent canyon parameters:' // &
[254]	437	'&street canyon can only be oriented' // &
	438	'&either in x- or in y-direction'
	439	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	440	ENDIF
	441
	442	nzb_local = ch
	443	IF ( canyon_width_x /= 9999999.9 ) THEN
	444	nzb_local(:,cxl+1:cxr-1) = 0
	445	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	446	nzb_local(cys+1:cyn-1,:) = 0
	447	ENDIF
	448
[1]	449	CASE ( 'read_from_file' )
	450	!
	451	!-- Arbitrary irregular topography data in PALM format (exactly matching
	452	!-- the grid size and total domain size)
	453	OPEN( 90, FILE='TOPOGRAPHY_DATA', STATUS='OLD', FORM='FORMATTED', &
	454	ERR=10 )
	455	DO j = ny, 0, -1
	456	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0, nx )
	457	ENDDO
	458	!
	459	!-- Calculate the index height of the topography
	460	DO i = 0, nx
	461	DO j = 0, ny
	462	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
	463	ENDDO
	464	ENDDO
[114]	465	!
	466	!-- Add cyclic boundaries (additional layers are for calculating flag
	467	!-- arrays needed for the multigrid sover)
	468	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	469	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	470	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	471	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[1]	472
	473	GOTO 12
[254]	474
	475	10 message_string = 'file TOPOGRAPHY_DATA does not exist'
	476	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
[1]	477
[254]	478	11 message_string = 'errors in file TOPOGRAPHY_DATA'
	479	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
[1]	480
	481	12 CLOSE( 90 )
	482
	483	CASE DEFAULT
	484	!
	485	!-- The DEFAULT case is reached either if the parameter topography
[217]	486	!-- contains a wrong character string or if the user has defined a special
[1]	487	!-- case in the user interface. There, the subroutine user_init_grid
	488	!-- checks which of these two conditions applies.
[114]	489	CALL user_init_grid( gls, nzb_local )
[1]	490
	491	END SELECT
	492
	493	!
[114]	494	!-- Test output of nzb_local -1:ny+1,-1:nx+1
[145]	495	! WRITE (9,) ' nzb_local *'
	496	! DO j = ny+1, -1, -1
	497	! WRITE (9,'(194(1X,I2))') ( nzb_local(j,i), i = -1, nx+1 )
	498	! ENDDO
[114]	499
	500	!
[1]	501	!-- Consistency checks and index array initialization are only required for
[217]	502	!-- non-flat topography, also the initialization of topography height arrays
[49]	503	!-- zu_s_inner and zw_w_inner
[1]	504	IF ( TRIM( topography ) /= 'flat' ) THEN
	505
	506	!
	507	!-- Consistency checks
	508	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[274]	509	WRITE( message_string, * ) 'nzb_local values are outside the', &
	510	'model domain', &
	511	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
	512	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	513	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	514	ENDIF
	515
	516	IF ( bc_lr == 'cyclic' ) THEN
	517	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
	518	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[254]	519	message_string = 'nzb_local does not fulfill cyclic' // &
	520	' boundary condition in x-direction'
	521	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	522	ENDIF
	523	ENDIF
	524	IF ( bc_ns == 'cyclic' ) THEN
	525	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
	526	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[254]	527	message_string = 'nzb_local does not fulfill cyclic' // &
	528	' boundary condition in y-direction'
	529	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	530	ENDIF
	531	ENDIF
	532
[217]	533	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	534	!
[217]	535	!-- The array nzb_local as defined using the 'cell_edge' convention
	536	!-- describes the actual total size of topography which is defined at the
	537	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	538	!-- on the topography walls in y-direction. However, PALM uses individual
	539	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	540	!-- Therefore, the extent of topography in nzb_local is now reduced by
	541	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	542	!-- to form the basis for nzb_s_inner.
	543	DO j = -gls, ny + gls
	544	DO i = -gls, nx
	545	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	546	ENDDO
[134]	547	ENDDO
[217]	548	!-- apply cyclic boundary conditions in x-direction
	549	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	550	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	551	DO i = -gls, nx + gls
	552	DO j = -gls, ny
	553	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	554	ENDDO
[134]	555	ENDDO
[217]	556	!-- apply cyclic boundary conditions in y-direction
	557	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	558	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	559	ENDIF
[134]	560
[1]	561	!
	562	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
	563	nzb_s_inner = nzb_local(nys-1:nyn+1,nxl-1:nxr+1)
	564	nzb_w_inner = nzb_local(nys-1:nyn+1,nxl-1:nxr+1)
	565
	566	!
	567	!-- Initialize remaining index arrays:
	568	!-- first pre-initialize them with nzb_s_inner...
	569	nzb_u_inner = nzb_s_inner
	570	nzb_u_outer = nzb_s_inner
	571	nzb_v_inner = nzb_s_inner
	572	nzb_v_outer = nzb_s_inner
	573	nzb_w_outer = nzb_s_inner
	574	nzb_s_outer = nzb_s_inner
	575
	576	!
	577	!-- ...then extend pre-initialized arrays in their according directions
	578	!-- based on nzb_local using nzb_tmp as a temporary global index array
	579
	580	!
	581	!-- nzb_s_outer:
	582	!-- extend nzb_local east-/westwards first, then north-/southwards
[114]	583	nzb_tmp = nzb_local(-1:ny+1,-1:nx+1)
[1]	584	DO j = -1, ny + 1
	585	DO i = 0, nx
	586	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
	587	nzb_local(j,i+1) )
	588	ENDDO
	589	ENDDO
	590	DO i = nxl, nxr
	591	DO j = nys, nyn
	592	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	593	nzb_tmp(j+1,i) )
	594	ENDDO
	595	!
	596	!-- non-cyclic boundary conditions (overwritten by call of
	597	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	598	IF ( nys == 0 ) THEN
	599	j = -1
	600	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	601	ENDIF
	602	IF ( nys == ny ) THEN
	603	j = ny + 1
	604	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	605	ENDIF
	606	ENDDO
	607	!
	608	!-- nzb_w_outer:
	609	!-- identical to nzb_s_outer
	610	nzb_w_outer = nzb_s_outer
	611
	612	!
	613	!-- nzb_u_inner:
	614	!-- extend nzb_local rightwards only
[114]	615	nzb_tmp = nzb_local(-1:ny+1,-1:nx+1)
[1]	616	DO j = -1, ny + 1
	617	DO i = 0, nx + 1
	618	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	619	ENDDO
	620	ENDDO
	621	nzb_u_inner = nzb_tmp(nys-1:nyn+1,nxl-1:nxr+1)
	622
	623	!
	624	!-- nzb_u_outer:
	625	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	626	DO i = nxl, nxr
	627	DO j = nys, nyn
	628	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	629	nzb_tmp(j+1,i) )
	630	ENDDO
	631	!
	632	!-- non-cyclic boundary conditions (overwritten by call of
	633	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	634	IF ( nys == 0 ) THEN
	635	j = -1
	636	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	637	ENDIF
	638	IF ( nys == ny ) THEN
	639	j = ny + 1
	640	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	641	ENDIF
	642	ENDDO
	643
	644	!
	645	!-- nzb_v_inner:
	646	!-- extend nzb_local northwards only
[114]	647	nzb_tmp = nzb_local(-1:ny+1,-1:nx+1)
[1]	648	DO i = -1, nx + 1
	649	DO j = 0, ny + 1
	650	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	651	ENDDO
	652	ENDDO
	653	nzb_v_inner = nzb_tmp(nys-1:nyn+1,nxl-1:nxr+1)
	654
	655	!
	656	!-- nzb_v_outer:
	657	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	658	DO j = nys, nyn
	659	DO i = nxl, nxr
	660	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
	661	nzb_tmp(j,i+1) )
	662	ENDDO
	663	!
	664	!-- non-cyclic boundary conditions (overwritten by call of
	665	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	666	IF ( nxl == 0 ) THEN
	667	i = -1
	668	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	669	ENDIF
	670	IF ( nxr == nx ) THEN
	671	i = nx + 1
	672	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	673	ENDIF
	674	ENDDO
	675
	676	!
	677	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	678	!-- boundary conditions, if applicable.
	679	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	680	!-- they do not require exchange and are not included here.
	681	CALL exchange_horiz_2d_int( nzb_u_inner )
	682	CALL exchange_horiz_2d_int( nzb_u_outer )
	683	CALL exchange_horiz_2d_int( nzb_v_inner )
	684	CALL exchange_horiz_2d_int( nzb_v_outer )
	685	CALL exchange_horiz_2d_int( nzb_w_outer )
	686	CALL exchange_horiz_2d_int( nzb_s_outer )
	687
[49]	688	!
	689	!-- Allocate and set the arrays containing the topography height
	690	IF ( myid == 0 ) THEN
	691
	692	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	693
	694	DO i = 0, nx + 1
	695	DO j = 0, ny + 1
	696	zu_s_inner(i,j) = zu(nzb_local(j,i))
	697	zw_w_inner(i,j) = zw(nzb_local(j,i))
	698	ENDDO
	699	ENDDO
	700
	701	ENDIF
	702
[1]	703	ENDIF
	704
	705	!
	706	!-- Preliminary: to be removed after completion of the topography code!
	707	!-- Set the former default k index arrays nzb_2d
	708	nzb_2d = nzb
	709
	710	!
	711	!-- Set the individual index arrays which define the k index from which on
	712	!-- the usual finite difference form (which does not use surface fluxes) is
	713	!-- applied
	714	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	715	nzb_diff_u = nzb_u_inner + 2
	716	nzb_diff_v = nzb_v_inner + 2
	717	nzb_diff_s_inner = nzb_s_inner + 2
	718	nzb_diff_s_outer = nzb_s_outer + 2
	719	ELSE
	720	nzb_diff_u = nzb_u_inner + 1
	721	nzb_diff_v = nzb_v_inner + 1
	722	nzb_diff_s_inner = nzb_s_inner + 1
	723	nzb_diff_s_outer = nzb_s_outer + 1
	724	ENDIF
	725
	726	!
	727	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	728	!-- for limitation of near-wall mixing length l_wall further below
	729	corner_nl = 0
	730	corner_nr = 0
	731	corner_sl = 0
	732	corner_sr = 0
	733	wall_l = 0
	734	wall_n = 0
	735	wall_r = 0
	736	wall_s = 0
	737
	738	DO i = nxl, nxr
	739	DO j = nys, nyn
	740	!
	741	!-- u-component
	742	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
	743	wall_u(j,i) = 1.0 ! north wall (location of adjacent fluid)
	744	fym(j,i) = 0.0
	745	fyp(j,i) = 1.0
	746	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
	747	wall_u(j,i) = 1.0 ! south wall (location of adjacent fluid)
	748	fym(j,i) = 1.0
	749	fyp(j,i) = 0.0
	750	ENDIF
	751	!
	752	!-- v-component
	753	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
	754	wall_v(j,i) = 1.0 ! rigth wall (location of adjacent fluid)
	755	fxm(j,i) = 0.0
	756	fxp(j,i) = 1.0
	757	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
	758	wall_v(j,i) = 1.0 ! left wall (location of adjacent fluid)
	759	fxm(j,i) = 1.0
	760	fxp(j,i) = 0.0
	761	ENDIF
	762	!
	763	!-- w-component, also used for scalars, separate arrays for shear
	764	!-- production of tke
	765	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
	766	wall_e_y(j,i) = 1.0 ! north wall (location of adjacent fluid)
	767	wall_w_y(j,i) = 1.0
	768	fwym(j,i) = 0.0
	769	fwyp(j,i) = 1.0
	770	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
	771	wall_e_y(j,i) = -1.0 ! south wall (location of adjacent fluid)
	772	wall_w_y(j,i) = 1.0
	773	fwym(j,i) = 1.0
	774	fwyp(j,i) = 0.0
	775	ENDIF
	776	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
	777	wall_e_x(j,i) = 1.0 ! right wall (location of adjacent fluid)
	778	wall_w_x(j,i) = 1.0
	779	fwxm(j,i) = 0.0
	780	fwxp(j,i) = 1.0
	781	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
	782	wall_e_x(j,i) = -1.0 ! left wall (location of adjacent fluid)
	783	wall_w_x(j,i) = 1.0
	784	fwxm(j,i) = 1.0
	785	fwxp(j,i) = 0.0
	786	ENDIF
	787	!
	788	!-- Wall and corner locations inside buildings for limitation of
	789	!-- near-wall mixing length l_wall
	790	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	791
	792	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	793
	794	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	795	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	796	nzb_s_inner(j,i-1) ) + 1
	797	ENDIF
	798
	799	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	800	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	801	nzb_s_inner(j,i+1) ) + 1
	802	ENDIF
	803
	804	ENDIF
	805
	806	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	807
	808	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	809	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	810	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	811	nzb_s_inner(j,i-1) ) + 1
	812	ENDIF
	813
	814	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	815	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	816	nzb_s_inner(j,i+1) ) + 1
	817	ENDIF
	818
	819	ENDIF
	820
	821	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	822	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	823	ENDIF
	824
	825	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	826	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	827	ENDIF
	828
	829	ENDDO
	830	ENDDO
	831
	832	!
[114]	833	!-- Calculate wall flag arrays for the multigrid method
	834	IF ( psolver == 'multigrid' ) THEN
	835	!
	836	!-- Gridpoint increment of the current level
	837	inc = 1
	838
	839	DO l = maximum_grid_level, 1 , -1
	840
	841	nxl_l = nxl_mg(l)
	842	nxr_l = nxr_mg(l)
	843	nys_l = nys_mg(l)
	844	nyn_l = nyn_mg(l)
	845	nzt_l = nzt_mg(l)
	846
	847	!
	848	!-- Assign the flag level to be calculated
	849	SELECT CASE ( l )
	850	CASE ( 1 )
	851	flags => wall_flags_1
	852	CASE ( 2 )
	853	flags => wall_flags_2
	854	CASE ( 3 )
	855	flags => wall_flags_3
	856	CASE ( 4 )
	857	flags => wall_flags_4
	858	CASE ( 5 )
	859	flags => wall_flags_5
	860	CASE ( 6 )
	861	flags => wall_flags_6
	862	CASE ( 7 )
	863	flags => wall_flags_7
	864	CASE ( 8 )
	865	flags => wall_flags_8
	866	CASE ( 9 )
	867	flags => wall_flags_9
	868	CASE ( 10 )
	869	flags => wall_flags_10
	870	END SELECT
	871
	872	!
	873	!-- Depending on the grid level, set the respective bits in case of
	874	!-- neighbouring walls
	875	!-- Bit 0: wall to the bottom
	876	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	877	!-- Bit 2: wall to the south
	878	!-- Bit 3: wall to the north
	879	!-- Bit 4: wall to the left
	880	!-- Bit 5: wall to the right
[116]	881	!-- Bit 6: inside building
[114]	882
	883	flags = 0
	884
	885	DO i = nxl_l-1, nxr_l+1
	886	DO j = nys_l-1, nyn_l+1
	887	DO k = nzb, nzt_l+1
	888
	889	!
	890	!-- Inside/outside building (inside building does not need
	891	!-- further tests for walls)
	892	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
	893
	894	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
	895
	896	ELSE
	897	!
	898	!-- Bottom wall
	899	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	900	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	901	ENDIF
	902	!
	903	!-- South wall
	904	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	905	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	906	ENDIF
	907	!
	908	!-- North wall
	909	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	910	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	911	ENDIF
	912	!
	913	!-- Left wall
	914	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	915	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	916	ENDIF
	917	!
	918	!-- Right wall
	919	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	920	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	921	ENDIF
	922
	923	ENDIF
	924
	925	ENDDO
	926	ENDDO
	927	ENDDO
	928
	929	!
	930	!-- Test output of flag arrays
[145]	931	! i = nxl_l
	932	! WRITE (9,*) ' '
	933	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	934	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	935	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	936	! DO k = nzt_l+1, nzb, -1
	937	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	938	! ENDDO
[114]	939
	940	inc = inc * 2
	941
	942	ENDDO
	943
	944	ENDIF
	945
	946	!
[1]	947	!-- In case of topography: limit near-wall mixing length l_wall further:
	948	!-- Go through all points of the subdomain one by one and look for the closest
	949	!-- surface
	950	IF ( TRIM(topography) /= 'flat' ) THEN
	951	DO i = nxl, nxr
	952	DO j = nys, nyn
	953
	954	nzb_si = nzb_s_inner(j,i)
	955	vi = vertical_influence(nzb_si)
	956
	957	IF ( wall_n(j,i) > 0 ) THEN
	958	!
	959	!-- North wall (y distance)
	960	DO k = wall_n(j,i), nzb_si
	961	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5 * dy )
	962	ENDDO
	963	!
	964	!-- Above North wall (yz distance)
	965	DO k = nzb_si + 1, nzb_si + vi
	966	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	967	SQRT( 0.25 * dy**2 + &
	968	( zu(k) - zw(nzb_si) )**2 ) )
	969	ENDDO
	970	!
	971	!-- Northleft corner (xy distance)
	972	IF ( corner_nl(j,i) > 0 ) THEN
	973	DO k = corner_nl(j,i), nzb_si
	974	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	975	0.5 * SQRT( dx2 + dy2 ) )
	976	ENDDO
	977	!
	978	!-- Above Northleft corner (xyz distance)
	979	DO k = nzb_si + 1, nzb_si + vi
	980	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	981	SQRT( 0.25 * (dx2 + dy2) + &
	982	( zu(k) - zw(nzb_si) )**2 ) )
	983	ENDDO
	984	ENDIF
	985	!
	986	!-- Northright corner (xy distance)
	987	IF ( corner_nr(j,i) > 0 ) THEN
	988	DO k = corner_nr(j,i), nzb_si
	989	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	990	0.5 * SQRT( dx2 + dy2 ) )
	991	ENDDO
	992	!
	993	!-- Above northright corner (xyz distance)
	994	DO k = nzb_si + 1, nzb_si + vi
	995	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	996	SQRT( 0.25 * (dx2 + dy2) + &
	997	( zu(k) - zw(nzb_si) )**2 ) )
	998	ENDDO
	999	ENDIF
	1000	ENDIF
	1001
	1002	IF ( wall_s(j,i) > 0 ) THEN
	1003	!
	1004	!-- South wall (y distance)
	1005	DO k = wall_s(j,i), nzb_si
	1006	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5 * dy )
	1007	ENDDO
	1008	!
	1009	!-- Above south wall (yz distance)
	1010	DO k = nzb_si + 1, &
	1011	nzb_si + vi
	1012	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1013	SQRT( 0.25 * dy**2 + &
	1014	( zu(k) - zw(nzb_si) )**2 ) )
	1015	ENDDO
	1016	!
	1017	!-- Southleft corner (xy distance)
	1018	IF ( corner_sl(j,i) > 0 ) THEN
	1019	DO k = corner_sl(j,i), nzb_si
	1020	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1021	0.5 * SQRT( dx2 + dy2 ) )
	1022	ENDDO
	1023	!
	1024	!-- Above southleft corner (xyz distance)
	1025	DO k = nzb_si + 1, nzb_si + vi
	1026	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1027	SQRT( 0.25 * (dx2 + dy2) + &
	1028	( zu(k) - zw(nzb_si) )**2 ) )
	1029	ENDDO
	1030	ENDIF
	1031	!
	1032	!-- Southright corner (xy distance)
	1033	IF ( corner_sr(j,i) > 0 ) THEN
	1034	DO k = corner_sr(j,i), nzb_si
	1035	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1036	0.5 * SQRT( dx2 + dy2 ) )
	1037	ENDDO
	1038	!
	1039	!-- Above southright corner (xyz distance)
	1040	DO k = nzb_si + 1, nzb_si + vi
	1041	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1042	SQRT( 0.25 * (dx2 + dy2) + &
	1043	( zu(k) - zw(nzb_si) )**2 ) )
	1044	ENDDO
	1045	ENDIF
	1046
	1047	ENDIF
	1048
	1049	IF ( wall_l(j,i) > 0 ) THEN
	1050	!
	1051	!-- Left wall (x distance)
	1052	DO k = wall_l(j,i), nzb_si
	1053	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5 * dx )
	1054	ENDDO
	1055	!
	1056	!-- Above left wall (xz distance)
	1057	DO k = nzb_si + 1, nzb_si + vi
	1058	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1059	SQRT( 0.25 * dx**2 + &
	1060	( zu(k) - zw(nzb_si) )**2 ) )
	1061	ENDDO
	1062	ENDIF
	1063
	1064	IF ( wall_r(j,i) > 0 ) THEN
	1065	!
	1066	!-- Right wall (x distance)
	1067	DO k = wall_r(j,i), nzb_si
	1068	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5 * dx )
	1069	ENDDO
	1070	!
	1071	!-- Above right wall (xz distance)
	1072	DO k = nzb_si + 1, nzb_si + vi
	1073	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1074	SQRT( 0.25 * dx**2 + &
	1075	( zu(k) - zw(nzb_si) )**2 ) )
	1076	ENDDO
	1077
	1078	ENDIF
	1079
	1080	ENDDO
	1081	ENDDO
	1082
	1083	ENDIF
	1084
	1085	!
	1086	!-- Multiplication with wall_adjustment_factor
	1087	l_wall = wall_adjustment_factor * l_wall
	1088
	1089	!
	1090	!-- Need to set lateral boundary conditions for l_wall
[75]	1091	CALL exchange_horiz( l_wall )
[1]	1092
	1093	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1094	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1095
	1096
	1097	END SUBROUTINE init_grid

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