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source: palm/trunk/SOURCE/init_grid.f90 @ 869

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

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