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source: palm/trunk/SOURCE/init_grid.f90 @ 950

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

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