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source: palm/trunk/SOURCE/init_grid.f90 @ 1763

Last change on this file since 1763 was 1763, checked in by hellstea, 8 years ago
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[1682]	1	!> @file init_grid.f90
[1743]	2	!-------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
	5	! PALM is free software: you can redistribute it and/or modify it under the terms
	6	! of the GNU General Public License as published by the Free Software Foundation,
	7	! either version 3 of the License, or (at your option) any later version.
	8	!
	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	12	!
	13	! You should have received a copy of the GNU General Public License along with
	14	! PALM. If not, see <http://www.gnu.org/licenses/>.
	15	!
[1691]	16	! Copyright 1997-2015 Leibniz Universitaet Hannover
[1743]	17	!-------------------------------------------------------------------------------!
[1036]	18	!
[254]	19	! Current revisions:
[1]	20	! -----------------
[1763]	21	!
[1744]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: init_grid.f90 1763 2016-02-25 13:00:19Z hellstea $
	26	!
[1763]	27	! 1762 2016-02-25 12:31:13Z hellstea
	28	! Introduction of nested domain feature
	29	!
[1744]	30	! 1743 2016-01-13 10:23:51Z raasch
	31	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	32	! total domain
	33	!
[1692]	34	! 1691 2015-10-26 16:17:44Z maronga
	35	! Renamed prandtl_layer to constant_flux_layer.
	36	!
[1683]	37	! 1682 2015-10-07 23:56:08Z knoop
	38	! Code annotations made doxygen readable
	39	!
[1678]	40	! 1677 2015-10-02 13:25:23Z boeske
	41	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	42	!
[1676]	43	! 1675 2015-10-02 08:28:59Z gronemeier
	44	! Bugfix: Definition of topography grid levels
	45	!
[1662]	46	! 1660 2015-09-21 08:15:16Z gronemeier
	47	! Bugfix: Definition of topography grid levels if vertical grid stretching
	48	! starts below the maximum topography height.
	49	!
[1581]	50	! 1580 2015-04-10 13:43:49Z suehring
	51	! Bugfix: setting flags for 5th order scheme near buildings
	52	!
[1576]	53	! 1575 2015-03-27 09:56:27Z raasch
	54	! adjustments for psolver-queries
	55	!
[1558]	56	! 1557 2015-03-05 16:43:04Z suehring
	57	! Adjustment for monotoinic limiter
	58	!
[1419]	59	! 1418 2014-06-06 13:05:08Z fricke
	60	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	61	! condition and a negative value for dz_stretch_level the condition
	62	! was always true for the whole model domain
	63	!
[1410]	64	! 1409 2014-05-23 12:11:32Z suehring
	65	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	66	! j <= nysv
	67	!
[1354]	68	! 1353 2014-04-08 15:21:23Z heinze
	69	! REAL constants provided with KIND-attribute
	70	!
[1323]	71	! 1322 2014-03-20 16:38:49Z raasch
	72	! REAL constants defined as wp-kind
	73	!
[1321]	74	! 1320 2014-03-20 08:40:49Z raasch
[1320]	75	! ONLY-attribute added to USE-statements,
	76	! kind-parameters added to all INTEGER and REAL declaration statements,
	77	! kinds are defined in new module kinds,
	78	! revision history before 2012 removed,
	79	! comment fields (!:) to be used for variable explanations added to
	80	! all variable declaration statements
[1321]	81	!
[1222]	82	! 1221 2013-09-10 08:59:13Z raasch
	83	! wall_flags_00 introduced to hold bits 32-63,
	84	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	85	! loops optimized for openACC (pres + flow_statistics)
	86	!
[1093]	87	! 1092 2013-02-02 11:24:22Z raasch
	88	! unused variables removed
	89	!
[1070]	90	! 1069 2012-11-28 16:18:43Z maronga
	91	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	92	! model in case of coupled runs
	93	!
[1037]	94	! 1036 2012-10-22 13:43:42Z raasch
	95	! code put under GPL (PALM 3.9)
	96	!
[1017]	97	! 1015 2012-09-27 09:23:24Z raasch
	98	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	99	! nzb_w_inner+1
	100	!
[997]	101	! 996 2012-09-07 10:41:47Z raasch
	102	! little reformatting
	103	!
[979]	104	! 978 2012-08-09 08:28:32Z fricke
	105	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	106	! Bugfix: Set wall_flags_0 for inflow boundary
	107	!
[928]	108	! 927 2012-06-06 19:15:04Z raasch
	109	! Wall flags are not set for multigrid method in case of masking method
	110	!
[865]	111	! 864 2012-03-27 15:10:33Z gryschka
[927]	112	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	113	! were not correctly defined for k=1.
[865]	114	!
[863]	115	! 861 2012-03-26 14:18:34Z suehring
[861]	116	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	117	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	118	! model domain.!
[861]	119	! Initialization of nzb_s_inner and nzb_w_inner.
	120	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	121	! while setting wall_flags_0
	122	!
[844]	123	! 843 2012-02-29 15:16:21Z gryschka
	124	! In case of ocean and dirichlet bc for u and v at the bottom
	125	! the first u-level ist defined at same height as the first w-level
	126	!
[819]	127	! 818 2012-02-08 16:11:23Z maronga
	128	! Bugfix: topo_height is only required if topography is used. It is thus now
	129	! allocated in the topography branch
	130	!
[810]	131	! 809 2012-01-30 13:32:58Z maronga
	132	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	133	!
[808]	134	! 807 2012-01-25 11:53:51Z maronga
	135	! New cpp directive "__check" implemented which is used by check_namelist_files
	136	!
[1]	137	! Revision 1.1 1997/08/11 06:17:45 raasch
	138	! Initial revision (Testversion)
	139	!
	140	!
	141	! Description:
	142	! ------------
[1682]	143	!> Creating grid depending constants
[1]	144	!------------------------------------------------------------------------------!
[1682]	145	SUBROUTINE init_grid
	146
[1]	147
[1320]	148	USE arrays_3d, &
	149	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	150	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	151
[1353]	152	USE control_parameters, &
[1320]	153	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	154	building_length_y, building_wall_left, building_wall_south, &
	155	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	156	canyon_width_x, canyon_width_y, constant_flux_layer, &
	157	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	158	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	159	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	160	masking_method, maximum_grid_level, message_string, &
[1762]	161	momentum_advec, nest_domain, nest_bound_l, nest_bound_n, &
	162	nest_bound_r, nest_bound_s, ocean, outflow_l, outflow_n, &
	163	outflow_r, outflow_s, psolver, scalar_advec, topography, &
[1691]	164	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	165	wall_adjustment_factor
[1320]	166
	167	USE grid_variables, &
	168	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	169	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	170	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	171
	172	USE indices, &
	173	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	174	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
	175	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	176	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	177	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	178	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	179	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	180	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	181	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	182	wall_flags_9
	183
	184	USE kinds
	185
[1]	186	USE pegrid
	187
	188	IMPLICIT NONE
	189
[1682]	190	INTEGER(iwp) :: bh !<
	191	INTEGER(iwp) :: blx !<
	192	INTEGER(iwp) :: bly !<
	193	INTEGER(iwp) :: bxl !<
	194	INTEGER(iwp) :: bxr !<
	195	INTEGER(iwp) :: byn !<
	196	INTEGER(iwp) :: bys !<
	197	INTEGER(iwp) :: ch !<
	198	INTEGER(iwp) :: cwx !<
	199	INTEGER(iwp) :: cwy !<
	200	INTEGER(iwp) :: cxl !<
	201	INTEGER(iwp) :: cxr !<
	202	INTEGER(iwp) :: cyn !<
	203	INTEGER(iwp) :: cys !<
	204	INTEGER(iwp) :: gls !<
	205	INTEGER(iwp) :: i !<
	206	INTEGER(iwp) :: ii !<
	207	INTEGER(iwp) :: inc !<
	208	INTEGER(iwp) :: j !<
	209	INTEGER(iwp) :: k !<
	210	INTEGER(iwp) :: l !<
	211	INTEGER(iwp) :: nxl_l !<
	212	INTEGER(iwp) :: nxr_l !<
	213	INTEGER(iwp) :: nyn_l !<
	214	INTEGER(iwp) :: nys_l !<
	215	INTEGER(iwp) :: nzb_si !<
	216	INTEGER(iwp) :: nzt_l !<
	217	INTEGER(iwp) :: vi !<
[1]	218
[1682]	219	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
[1]	220
[1682]	221	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
	222	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
	223	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
	224	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
	225	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
	226	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
	227	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
	228	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
	229	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
	230	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
[1]	231
[1682]	232	LOGICAL :: flag_set = .FALSE. !<
[861]	233
[1682]	234	REAL(wp) :: dx_l !<
	235	REAL(wp) :: dy_l !<
	236	REAL(wp) :: dz_stretched !<
[1]	237
[1682]	238	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
[1]	239
[667]	240
[1]	241	!
[709]	242	!-- Calculation of horizontal array bounds including ghost layers
[667]	243	nxlg = nxl - nbgp
	244	nxrg = nxr + nbgp
	245	nysg = nys - nbgp
	246	nyng = nyn + nbgp
[709]	247
[667]	248	!
[1]	249	!-- Allocate grid arrays
[1353]	250	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	251	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	252
	253	!
	254	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	255	IF ( dz == -1.0_wp ) THEN
[254]	256	message_string = 'missing dz'
	257	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	258	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	259	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	260	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	261	ENDIF
[94]	262
[1]	263	!
[94]	264	!-- Define the vertical grid levels
	265	IF ( .NOT. ocean ) THEN
	266	!
	267	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	268	!-- The second u-level (k=1) corresponds to the top of the
[94]	269	!-- Prandtl-layer.
[667]	270
	271	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	272	zu(0) = 0.0_wp
	273	! zu(0) = - dz * 0.5_wp
[667]	274	ELSE
[1353]	275	zu(0) = - dz * 0.5_wp
[667]	276	ENDIF
[1353]	277	zu(1) = dz * 0.5_wp
[1]	278
[94]	279	dz_stretch_level_index = nzt+1
	280	dz_stretched = dz
	281	DO k = 2, nzt+1
	282	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	283	dz_stretched = dz_stretched * dz_stretch_factor
	284	dz_stretched = MIN( dz_stretched, dz_max )
	285	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	286	ENDIF
	287	zu(k) = zu(k-1) + dz_stretched
	288	ENDDO
[1]	289
	290	!
[94]	291	!-- Compute the w-levels. They are always staggered half-way between the
[843]	292	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	293	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	294	!-- The top w-level is extrapolated linearly.
[1353]	295	zw(0) = 0.0_wp
[94]	296	DO k = 1, nzt
[1353]	297	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	298	ENDDO
[1353]	299	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	300
[94]	301	ELSE
[1]	302	!
[843]	303	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	304	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	305	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	306	!-- w-level are defined at same height, but staggered from the second level.
	307	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	308	zu(nzt+1) = dz * 0.5_wp
	309	zu(nzt) = - dz * 0.5_wp
[94]	310
	311	dz_stretch_level_index = 0
	312	dz_stretched = dz
	313	DO k = nzt-1, 0, -1
[1418]	314	!
	315	!-- The default value of dz_stretch_level is positive, thus the first
	316	!-- condition is always true. Hence, the second condition is necessary.
	317	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	318	.AND. dz_stretched < dz_max ) THEN
[94]	319	dz_stretched = dz_stretched * dz_stretch_factor
	320	dz_stretched = MIN( dz_stretched, dz_max )
	321	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	322	ENDIF
	323	zu(k) = zu(k+1) - dz_stretched
	324	ENDDO
	325
	326	!
	327	!-- Compute the w-levels. They are always staggered half-way between the
[843]	328	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	329	!-- at the ground. In this case the first u- and w-level are defined at
	330	!-- same height. The top w-level (nzt+1) is not used but set for
	331	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	332	zw(nzt+1) = dz
[1353]	333	zw(nzt) = 0.0_wp
[94]	334	DO k = 0, nzt
[1353]	335	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	336	ENDDO
	337
[843]	338	!
	339	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	340	!-- at same height.
	341	IF ( ibc_uv_b == 0 ) THEN
	342	zu(0) = zw(0)
	343	ENDIF
	344
[94]	345	ENDIF
	346
	347	!
[1]	348	!-- Compute grid lengths.
	349	DO k = 1, nzt+1
	350	dzu(k) = zu(k) - zu(k-1)
[1353]	351	ddzu(k) = 1.0_wp / dzu(k)
[1]	352	dzw(k) = zw(k) - zw(k-1)
[1353]	353	ddzw(k) = 1.0_wp / dzw(k)
[1]	354	ENDDO
	355
	356	DO k = 1, nzt
[1353]	357	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	358	ENDDO
[667]	359
	360	!
[709]	361	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	362	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	363	!-- is only dz/2, but should be dz. Therefore, an additional array
	364	!-- containing with appropriate grid information is created for these
	365	!-- solvers.
[1575]	366	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	367	ALLOCATE( ddzu_pres(1:nzt+1) )
	368	ddzu_pres = ddzu
[864]	369	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	370	ENDIF
[1]	371
	372	!
	373	!-- In case of multigrid method, compute grid lengths and grid factors for the
	374	!-- grid levels
[1575]	375	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	376
	377	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	378	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	379	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	380	f1_mg(nzb+1:nzt,maximum_grid_level), &
	381	f2_mg(nzb+1:nzt,maximum_grid_level), &
	382	f3_mg(nzb+1:nzt,maximum_grid_level) )
	383
	384	dzu_mg(:,maximum_grid_level) = dzu
[667]	385	!
[864]	386	!-- Next line to ensure an equally spaced grid.
	387	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	388
[1]	389	dzw_mg(:,maximum_grid_level) = dzw
	390	nzt_l = nzt
	391	DO l = maximum_grid_level-1, 1, -1
[1353]	392	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	393	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	394	nzt_l = nzt_l / 2
	395	DO k = 2, nzt_l+1
	396	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	397	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	398	ENDDO
	399	ENDDO
	400
	401	nzt_l = nzt
	402	dx_l = dx
	403	dy_l = dy
	404	DO l = maximum_grid_level, 1, -1
[1353]	405	ddx2_mg(l) = 1.0_wp / dx_l**2
	406	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	407	DO k = nzb+1, nzt_l
[1353]	408	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	409	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	410	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	411	f2_mg(k,l) + f3_mg(k,l)
	412	ENDDO
	413	nzt_l = nzt_l / 2
[1353]	414	dx_l = dx_l * 2.0_wp
	415	dy_l = dy_l * 2.0_wp
[1]	416	ENDDO
	417
	418	ENDIF
	419
	420	!
	421	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	422	ddx = 1.0_wp / dx
	423	ddy = 1.0_wp / dy
[1]	424	dx2 = dx * dx
	425	dy2 = dy * dy
[1353]	426	ddx2 = 1.0_wp / dx2
	427	ddy2 = 1.0_wp / dy2
[1]	428
	429	!
	430	!-- Compute the grid-dependent mixing length.
	431	DO k = 1, nzt
[1322]	432	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	433	ENDDO
	434
	435	!
	436	!-- Allocate outer and inner index arrays for topography and set
[114]	437	!-- defaults.
	438	!-- nzb_local has to contain additional layers of ghost points for calculating
	439	!-- the flag arrays needed for the multigrid method
	440	gls = 2**( maximum_grid_level )
[861]	441	IF ( gls < nbgp ) gls = nbgp
[667]	442
[114]	443	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	444	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	445	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	446	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	447	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	448	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	449	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	450	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	451	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	452	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	453	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	454	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	455	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	456	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	457	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	458	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	459	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	460	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	461	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	462	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	463	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	464	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	465	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	466	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	467	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	468	wall_e_x(nysg:nyng,nxlg:nxrg), &
	469	wall_e_y(nysg:nyng,nxlg:nxrg), &
	470	wall_u(nysg:nyng,nxlg:nxrg), &
	471	wall_v(nysg:nyng,nxlg:nxrg), &
	472	wall_w_x(nysg:nyng,nxlg:nxrg), &
	473	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	474
	475
[667]	476
	477	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	478
[818]	479
[1]	480	nzb_s_inner = nzb; nzb_s_outer = nzb
	481	nzb_u_inner = nzb; nzb_u_outer = nzb
	482	nzb_v_inner = nzb; nzb_v_outer = nzb
	483	nzb_w_inner = nzb; nzb_w_outer = nzb
	484
[1353]	485	rflags_s_inner = 1.0_wp
	486	rflags_invers = 1.0_wp
[1221]	487
[1]	488	!
[19]	489	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	490	!-- form (which does not use surface fluxes) is applied
[1691]	491	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	492	nzb_diff = nzb + 2
	493	ELSE
	494	nzb_diff = nzb + 1
	495	ENDIF
[19]	496	IF ( use_top_fluxes ) THEN
	497	nzt_diff = nzt - 1
	498	ELSE
	499	nzt_diff = nzt
	500	ENDIF
[1]	501
	502	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	503	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	504
[1353]	505	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	506	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	507	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	508	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	509
	510	!
	511	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	512	!-- for the moment,
	513	!-- multiplication with wall_adjustment_factor near the end of this routine
	514	l_wall(nzb,:,:) = l_grid(1)
	515	DO k = nzb+1, nzt
	516	l_wall(k,:,:) = l_grid(k)
	517	ENDDO
	518	l_wall(nzt+1,:,:) = l_grid(nzt)
	519
	520	ALLOCATE ( vertical_influence(nzb:nzt) )
	521	DO k = 1, nzt
	522	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	523	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	524	ENDDO
	525
	526	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	527	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	528	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	529	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	530	'threshold given by only local', &
	531	' &horizontal reduction of near_wall ', &
	532	'mixing length l_wall', &
	533	' &starting from height level k = ', k, '.'
	534	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	535	EXIT
	536	ENDIF
	537	ENDDO
	538	vertical_influence(0) = vertical_influence(1)
	539
[667]	540	DO i = nxlg, nxrg
	541	DO j = nysg, nyng
[1]	542	DO k = nzb_s_inner(j,i) + 1, &
	543	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	544	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	545	ENDDO
	546	ENDDO
	547	ENDDO
	548
	549	!
	550	!-- Set outer and inner index arrays for non-flat topography.
	551	!-- Here consistency checks concerning domain size and periodicity are
	552	!-- necessary.
	553	!-- Within this SELECT CASE structure only nzb_local is initialized
	554	!-- individually depending on the chosen topography type, all other index
	555	!-- arrays are initialized further below.
	556	SELECT CASE ( TRIM( topography ) )
	557
	558	CASE ( 'flat' )
	559	!
[555]	560	!-- nzb_local is required for the multigrid solver
	561	nzb_local = 0
[1]	562
	563	CASE ( 'single_building' )
	564	!
	565	!-- Single rectangular building, by default centered in the middle of the
	566	!-- total domain
	567	blx = NINT( building_length_x / dx )
	568	bly = NINT( building_length_y / dy )
[1675]	569	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	570	IF ( ABS( zw(bh ) - building_height ) == &
	571	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	572
[1322]	573	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	574	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	575	ENDIF
	576	bxl = NINT( building_wall_left / dx )
	577	bxr = bxl + blx
	578
[1322]	579	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	580	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	581	ENDIF
	582	bys = NINT( building_wall_south / dy )
	583	byn = bys + bly
	584
	585	!
	586	!-- Building size has to meet some requirements
	587	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	588	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	589	WRITE( message_string, * ) 'inconsistent building parameters:', &
	590	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	591	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	592	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	593	ENDIF
	594
	595	!
[217]	596	!-- Define the building.
[1]	597	nzb_local = 0
[134]	598	nzb_local(bys:byn,bxl:bxr) = bh
[1]	599
[240]	600	CASE ( 'single_street_canyon' )
	601	!
	602	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	603	!-- The canyon is centered in the other direction by default.
[1322]	604	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	605	!
	606	!-- Street canyon in y direction
	607	cwx = NINT( canyon_width_x / dx )
[1322]	608	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	609	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	610	ENDIF
	611	cxl = NINT( canyon_wall_left / dx )
	612	cxr = cxl + cwx
	613
[1322]	614	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	615	!
	616	!-- Street canyon in x direction
	617	cwy = NINT( canyon_width_y / dy )
[1322]	618	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	619	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	620	ENDIF
	621	cys = NINT( canyon_wall_south / dy )
	622	cyn = cys + cwy
	623
	624	ELSE
[254]	625
	626	message_string = 'no street canyon width given'
	627	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	628
[240]	629	ENDIF
	630
[1675]	631	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	632	IF ( ABS( zw(ch ) - canyon_height ) == &
	633	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	634
[240]	635	dp_level_ind_b = ch
	636	!
	637	!-- Street canyon size has to meet some requirements
[1322]	638	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	639	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	640	( ch < 3 ) ) THEN
[1353]	641	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	642	'&cxl=', cxl, 'cxr=', cxr, &
	643	'cwx=', cwx, &
[254]	644	'ch=', ch, 'nx=', nx, 'ny=', ny
	645	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	646	ENDIF
[1322]	647	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	648	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	649	( ch < 3 ) ) THEN
[1353]	650	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	651	'&cys=', cys, 'cyn=', cyn, &
	652	'cwy=', cwy, &
[254]	653	'ch=', ch, 'nx=', nx, 'ny=', ny
	654	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	655	ENDIF
	656	ENDIF
[1353]	657	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	658	canyon_width_y /= 9999999.9_wp ) THEN
	659	message_string = 'inconsistent canyon parameters:' // &
	660	'&street canyon can only be oriented' // &
[254]	661	'&either in x- or in y-direction'
	662	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	663	ENDIF
	664
	665	nzb_local = ch
[1322]	666	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	667	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	668	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	669	nzb_local(cys+1:cyn-1,:) = 0
	670	ENDIF
	671
[1]	672	CASE ( 'read_from_file' )
[759]	673
[818]	674	ALLOCATE ( topo_height(0:ny,0:nx) )
	675
[759]	676	DO ii = 0, io_blocks-1
	677	IF ( ii == io_group ) THEN
	678
[1]	679	!
[759]	680	!-- Arbitrary irregular topography data in PALM format (exactly
	681	!-- matching the grid size and total domain size)
[1069]	682	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	683	FORM='FORMATTED', ERR=10 )
	684	DO j = ny, 0, -1
	685	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	686	ENDDO
	687
	688	GOTO 12
	689
[1069]	690	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	691	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	692
[1069]	693	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	694	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	695
	696	12 CLOSE( 90 )
	697
	698	ENDIF
[809]	699	#if defined( __parallel ) && ! defined ( __check )
[759]	700	CALL MPI_BARRIER( comm2d, ierr )
	701	#endif
[559]	702	ENDDO
[759]	703
[1]	704	!
	705	!-- Calculate the index height of the topography
	706	DO i = 0, nx
	707	DO j = 0, ny
[1675]	708	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	709	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	710	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	711	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	712	ENDDO
	713	ENDDO
[818]	714
	715	DEALLOCATE ( topo_height )
[114]	716	!
[759]	717	!-- Add cyclic boundaries (additional layers are for calculating
	718	!-- flag arrays needed for the multigrid sover)
[114]	719	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	720	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	721	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	722	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	723
[1]	724	CASE DEFAULT
	725	!
	726	!-- The DEFAULT case is reached either if the parameter topography
[217]	727	!-- contains a wrong character string or if the user has defined a special
[1]	728	!-- case in the user interface. There, the subroutine user_init_grid
	729	!-- checks which of these two conditions applies.
[114]	730	CALL user_init_grid( gls, nzb_local )
[1]	731
	732	END SELECT
	733	!
[861]	734	!-- Determine the maximum level of topography. Furthermore it is used for
	735	!-- steering the degradation of order of the applied advection scheme.
[978]	736	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	737	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	738	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	739	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[1762]	740	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s .OR. &
	741	nest_domain ) &
	742	THEN
	743	nzb_max = nzt
[978]	744	ENDIF
	745
[861]	746	!
[1]	747	!-- Consistency checks and index array initialization are only required for
[217]	748	!-- non-flat topography, also the initialization of topography height arrays
[49]	749	!-- zu_s_inner and zw_w_inner
[1]	750	IF ( TRIM( topography ) /= 'flat' ) THEN
	751
	752	!
	753	!-- Consistency checks
	754	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	755	WRITE( message_string, * ) 'nzb_local values are outside the', &
	756	'model domain', &
	757	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	758	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	759	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	760	ENDIF
	761
[722]	762	IF ( bc_lr == 'cyclic' ) THEN
[1353]	763	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	764	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	765	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	766	' boundary condition in x-direction'
	767	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	768	ENDIF
	769	ENDIF
[722]	770	IF ( bc_ns == 'cyclic' ) THEN
[1353]	771	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	772	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	773	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	774	' boundary condition in y-direction'
	775	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	776	ENDIF
	777	ENDIF
	778
[217]	779	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	780	!
[217]	781	!-- The array nzb_local as defined using the 'cell_edge' convention
	782	!-- describes the actual total size of topography which is defined at the
	783	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	784	!-- on the topography walls in y-direction. However, PALM uses individual
	785	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	786	!-- Therefore, the extent of topography in nzb_local is now reduced by
	787	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	788	!-- to form the basis for nzb_s_inner.
	789	DO j = -gls, ny + gls
	790	DO i = -gls, nx
	791	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	792	ENDDO
[134]	793	ENDDO
[217]	794	!-- apply cyclic boundary conditions in x-direction
	795	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	796	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	797	DO i = -gls, nx + gls
	798	DO j = -gls, ny
	799	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	800	ENDDO
[134]	801	ENDDO
[217]	802	!-- apply cyclic boundary conditions in y-direction
	803	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	804	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	805	ENDIF
[134]	806
[1]	807	!
	808	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	809	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	810	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	811
	812	!
	813	!-- Initialize remaining index arrays:
	814	!-- first pre-initialize them with nzb_s_inner...
	815	nzb_u_inner = nzb_s_inner
	816	nzb_u_outer = nzb_s_inner
	817	nzb_v_inner = nzb_s_inner
	818	nzb_v_outer = nzb_s_inner
	819	nzb_w_outer = nzb_s_inner
	820	nzb_s_outer = nzb_s_inner
	821
	822	!
	823	!-- ...then extend pre-initialized arrays in their according directions
	824	!-- based on nzb_local using nzb_tmp as a temporary global index array
	825
	826	!
	827	!-- nzb_s_outer:
	828	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	829	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	830	DO j = -1, ny + 1
	831	DO i = 0, nx
[1353]	832	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	833	nzb_local(j,i+1) )
	834	ENDDO
	835	ENDDO
	836	DO i = nxl, nxr
	837	DO j = nys, nyn
[1353]	838	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	839	nzb_tmp(j+1,i) )
	840	ENDDO
	841	!
	842	!-- non-cyclic boundary conditions (overwritten by call of
	843	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	844	IF ( nys == 0 ) THEN
	845	j = -1
	846	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	847	ENDIF
[1743]	848	IF ( nyn == ny ) THEN
[1]	849	j = ny + 1
	850	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	851	ENDIF
	852	ENDDO
	853	!
	854	!-- nzb_w_outer:
	855	!-- identical to nzb_s_outer
	856	nzb_w_outer = nzb_s_outer
	857
	858	!
	859	!-- nzb_u_inner:
	860	!-- extend nzb_local rightwards only
[667]	861	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	862	DO j = -1, ny + 1
	863	DO i = 0, nx + 1
	864	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	865	ENDDO
	866	ENDDO
[667]	867	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	868
	869	!
	870	!-- nzb_u_outer:
	871	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	872	DO i = nxl, nxr
	873	DO j = nys, nyn
[1353]	874	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	875	nzb_tmp(j+1,i) )
	876	ENDDO
	877	!
	878	!-- non-cyclic boundary conditions (overwritten by call of
	879	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	880	IF ( nys == 0 ) THEN
	881	j = -1
	882	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	883	ENDIF
[1743]	884	IF ( nyn == ny ) THEN
[1]	885	j = ny + 1
	886	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	887	ENDIF
	888	ENDDO
	889
	890	!
	891	!-- nzb_v_inner:
	892	!-- extend nzb_local northwards only
[667]	893	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	894	DO i = -1, nx + 1
	895	DO j = 0, ny + 1
	896	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	897	ENDDO
	898	ENDDO
[667]	899	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	900
	901	!
	902	!-- nzb_v_outer:
	903	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	904	DO j = nys, nyn
	905	DO i = nxl, nxr
[1353]	906	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	907	nzb_tmp(j,i+1) )
	908	ENDDO
	909	!
	910	!-- non-cyclic boundary conditions (overwritten by call of
	911	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	912	IF ( nxl == 0 ) THEN
	913	i = -1
	914	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	915	ENDIF
	916	IF ( nxr == nx ) THEN
	917	i = nx + 1
	918	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	919	ENDIF
	920	ENDDO
[809]	921	#if ! defined ( __check )
[1]	922	!
	923	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	924	!-- boundary conditions, if applicable.
	925	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	926	!-- they do not require exchange and are not included here.
	927	CALL exchange_horiz_2d_int( nzb_u_inner )
	928	CALL exchange_horiz_2d_int( nzb_u_outer )
	929	CALL exchange_horiz_2d_int( nzb_v_inner )
	930	CALL exchange_horiz_2d_int( nzb_v_outer )
	931	CALL exchange_horiz_2d_int( nzb_w_outer )
	932	CALL exchange_horiz_2d_int( nzb_s_outer )
	933
[49]	934	!
	935	!-- Allocate and set the arrays containing the topography height
	936	IF ( myid == 0 ) THEN
	937
	938	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	939
	940	DO i = 0, nx + 1
	941	DO j = 0, ny + 1
	942	zu_s_inner(i,j) = zu(nzb_local(j,i))
	943	zw_w_inner(i,j) = zw(nzb_local(j,i))
	944	ENDDO
	945	ENDDO
	946
	947	ENDIF
[1221]	948	!
	949	!-- Set flag arrays to be used for masking of grid points
	950	DO i = nxlg, nxrg
	951	DO j = nysg, nyng
	952	DO k = nzb, nzt+1
[1353]	953	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	954	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	955	ENDDO
	956	ENDDO
	957	ENDDO
[807]	958	#endif
[1]	959	ENDIF
	960
[809]	961	#if ! defined ( __check )
[1]	962	!
	963	!-- Preliminary: to be removed after completion of the topography code!
	964	!-- Set the former default k index arrays nzb_2d
	965	nzb_2d = nzb
	966
	967	!
	968	!-- Set the individual index arrays which define the k index from which on
	969	!-- the usual finite difference form (which does not use surface fluxes) is
	970	!-- applied
[1691]	971	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	972	nzb_diff_u = nzb_u_inner + 2
	973	nzb_diff_v = nzb_v_inner + 2
	974	nzb_diff_s_inner = nzb_s_inner + 2
	975	nzb_diff_s_outer = nzb_s_outer + 2
	976	ELSE
	977	nzb_diff_u = nzb_u_inner + 1
	978	nzb_diff_v = nzb_v_inner + 1
	979	nzb_diff_s_inner = nzb_s_inner + 1
	980	nzb_diff_s_outer = nzb_s_outer + 1
	981	ENDIF
	982
	983	!
	984	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	985	!-- for limitation of near-wall mixing length l_wall further below
	986	corner_nl = 0
	987	corner_nr = 0
	988	corner_sl = 0
	989	corner_sr = 0
	990	wall_l = 0
	991	wall_n = 0
	992	wall_r = 0
	993	wall_s = 0
	994
	995	DO i = nxl, nxr
	996	DO j = nys, nyn
	997	!
	998	!-- u-component
	999	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	1000	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1001	fym(j,i) = 0.0_wp
	1002	fyp(j,i) = 1.0_wp
[1]	1003	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	1004	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	1005	fym(j,i) = 1.0_wp
	1006	fyp(j,i) = 0.0_wp
[1]	1007	ENDIF
	1008	!
	1009	!-- v-component
	1010	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1011	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1012	fxm(j,i) = 0.0_wp
	1013	fxp(j,i) = 1.0_wp
[1]	1014	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1015	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1016	fxm(j,i) = 1.0_wp
	1017	fxp(j,i) = 0.0_wp
[1]	1018	ENDIF
	1019	!
	1020	!-- w-component, also used for scalars, separate arrays for shear
	1021	!-- production of tke
	1022	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1023	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1024	wall_w_y(j,i) = 1.0_wp
	1025	fwym(j,i) = 0.0_wp
	1026	fwyp(j,i) = 1.0_wp
[1]	1027	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1028	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1029	wall_w_y(j,i) = 1.0_wp
	1030	fwym(j,i) = 1.0_wp
	1031	fwyp(j,i) = 0.0_wp
[1]	1032	ENDIF
	1033	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1034	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1035	wall_w_x(j,i) = 1.0_wp
	1036	fwxm(j,i) = 0.0_wp
	1037	fwxp(j,i) = 1.0_wp
[1]	1038	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1039	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1040	wall_w_x(j,i) = 1.0_wp
	1041	fwxm(j,i) = 1.0_wp
	1042	fwxp(j,i) = 0.0_wp
[1]	1043	ENDIF
	1044	!
	1045	!-- Wall and corner locations inside buildings for limitation of
	1046	!-- near-wall mixing length l_wall
	1047	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1048
	1049	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1050
	1051	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1052	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1053	nzb_s_inner(j,i-1) ) + 1
	1054	ENDIF
	1055
	1056	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1057	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1058	nzb_s_inner(j,i+1) ) + 1
	1059	ENDIF
	1060
	1061	ENDIF
	1062
	1063	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1064
	1065	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1066	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1067	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1068	nzb_s_inner(j,i-1) ) + 1
	1069	ENDIF
	1070
	1071	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1072	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1073	nzb_s_inner(j,i+1) ) + 1
	1074	ENDIF
	1075
	1076	ENDIF
	1077
	1078	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1079	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1080	ENDIF
	1081
	1082	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1083	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1084	ENDIF
	1085
	1086	ENDDO
	1087	ENDDO
	1088
	1089	!
[114]	1090	!-- Calculate wall flag arrays for the multigrid method
[1575]	1091	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1092	!
	1093	!-- Gridpoint increment of the current level
	1094	inc = 1
	1095
	1096	DO l = maximum_grid_level, 1 , -1
	1097
	1098	nxl_l = nxl_mg(l)
	1099	nxr_l = nxr_mg(l)
	1100	nys_l = nys_mg(l)
	1101	nyn_l = nyn_mg(l)
	1102	nzt_l = nzt_mg(l)
	1103
	1104	!
	1105	!-- Assign the flag level to be calculated
	1106	SELECT CASE ( l )
	1107	CASE ( 1 )
	1108	flags => wall_flags_1
	1109	CASE ( 2 )
	1110	flags => wall_flags_2
	1111	CASE ( 3 )
	1112	flags => wall_flags_3
	1113	CASE ( 4 )
	1114	flags => wall_flags_4
	1115	CASE ( 5 )
	1116	flags => wall_flags_5
	1117	CASE ( 6 )
	1118	flags => wall_flags_6
	1119	CASE ( 7 )
	1120	flags => wall_flags_7
	1121	CASE ( 8 )
	1122	flags => wall_flags_8
	1123	CASE ( 9 )
	1124	flags => wall_flags_9
	1125	CASE ( 10 )
	1126	flags => wall_flags_10
	1127	END SELECT
	1128
	1129	!
	1130	!-- Depending on the grid level, set the respective bits in case of
	1131	!-- neighbouring walls
	1132	!-- Bit 0: wall to the bottom
	1133	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1134	!-- Bit 2: wall to the south
	1135	!-- Bit 3: wall to the north
	1136	!-- Bit 4: wall to the left
	1137	!-- Bit 5: wall to the right
[116]	1138	!-- Bit 6: inside building
[114]	1139
	1140	flags = 0
	1141
[927]	1142	!
	1143	!-- In case of masking method, flags are not set and multigrid method
	1144	!-- works like FFT-solver
	1145	IF ( .NOT. masking_method ) THEN
	1146
	1147	DO i = nxl_l-1, nxr_l+1
	1148	DO j = nys_l-1, nyn_l+1
	1149	DO k = nzb, nzt_l+1
[114]	1150
	1151	!
[927]	1152	!-- Inside/outside building (inside building does not need
	1153	!-- further tests for walls)
	1154	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1155
[927]	1156	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1157
[927]	1158	ELSE
[114]	1159	!
[927]	1160	!-- Bottom wall
	1161	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1162	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1163	ENDIF
[114]	1164	!
[927]	1165	!-- South wall
	1166	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1167	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1168	ENDIF
[114]	1169	!
[927]	1170	!-- North wall
	1171	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1172	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1173	ENDIF
[114]	1174	!
[927]	1175	!-- Left wall
	1176	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1177	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1178	ENDIF
[114]	1179	!
[927]	1180	!-- Right wall
	1181	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1182	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1183	ENDIF
	1184
[114]	1185	ENDIF
	1186
[927]	1187	ENDDO
[114]	1188	ENDDO
	1189	ENDDO
	1190
[927]	1191	ENDIF
	1192
[114]	1193	!
	1194	!-- Test output of flag arrays
[145]	1195	! i = nxl_l
	1196	! WRITE (9,*) ' '
	1197	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1198	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1199	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1200	! DO k = nzt_l+1, nzb, -1
	1201	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1202	! ENDDO
[114]	1203
	1204	inc = inc * 2
	1205
	1206	ENDDO
	1207
	1208	ENDIF
[861]	1209	!
	1210	!-- Allocate flags needed for masking walls.
[1677]	1211	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1212	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1213	wall_flags_0 = 0
	1214	wall_flags_00 = 0
[114]	1215
[1557]	1216	IF ( scalar_advec == 'ws-scheme' .OR. &
	1217	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1218	!
[861]	1219	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1220	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1221	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1222	!-- grid points.
	1223	DO i = nxl, nxr
	1224	DO j = nys, nyn
	1225	DO k = nzb_s_inner(j,i)+1, nzt
	1226	!
	1227	!-- scalar - x-direction
	1228	!-- WS1 (0), WS3 (1), WS5 (2)
[1762]	1229	IF ( k <= nzb_s_inner(j,i+1) .OR. &
	1230	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1231	.AND. i == nxl ) .OR. &
	1232	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1233	.AND. i == nxr ) ) &
	1234	THEN
[861]	1235	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1236	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[1762]	1237	.OR. &
	1238	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1239	.AND. i == nxr-1 ) .OR. &
	1240	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1241	.AND. i == nxlu ) ) &
	1242	THEN
[861]	1243	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1244	ELSE
	1245	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1246	ENDIF
	1247	!
	1248	!-- scalar - y-direction
	1249	!-- WS1 (3), WS3 (4), WS5 (5)
[1762]	1250	IF ( k <= nzb_s_inner(j+1,i) .OR. &
	1251	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1252	.AND. j == nys ) .OR. &
	1253	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1254	.AND. j == nyn ) ) &
	1255	THEN
[861]	1256	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
[1762]	1257	!
[861]	1258	!-- WS3
	1259	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[1762]	1260	.OR. &
	1261	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1262	.AND. j == nysv ) .OR. &
	1263	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1264	.AND. j == nyn-1 ) ) &
	1265	THEN
[861]	1266	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
[1762]	1267	!
[861]	1268	!-- WS5
	1269	ELSE
	1270	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1271	ENDIF
	1272	!
	1273	!-- scalar - z-direction
	1274	!-- WS1 (6), WS3 (7), WS5 (8)
	1275	flag_set = .FALSE.
	1276	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1277	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1278	flag_set = .TRUE.
	1279	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1280	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1281	flag_set = .TRUE.
	1282	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1283	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1284	ENDIF
	1285	ENDDO
	1286	ENDDO
	1287	ENDDO
	1288	ENDIF
	1289
	1290	IF ( momentum_advec == 'ws-scheme' ) THEN
	1291	!
	1292	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1293	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1294	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1295	!-- grid points.
	1296	DO i = nxl, nxr
	1297	DO j = nys, nyn
[1580]	1298	DO k = nzb+1, nzt
[861]	1299	!
[1580]	1300	!-- At first, set flags to WS1.
	1301	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1302	!-- in order to handle the left/south flux.
	1303	!-- near vertical walls.
	1304	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1305	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1306	!
[861]	1307	!-- u component - x-direction
	1308	!-- WS1 (9), WS3 (10), WS5 (11)
[1762]	1309	IF ( k <= nzb_u_inner(j,i+1) .OR. &
	1310	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1311	.AND. i <= nxlu ) .OR. &
	1312	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1313	.AND. i == nxr ) ) &
	1314	THEN
[1580]	1315	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[1762]	1316	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
	1317	.OR. &
	1318	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1319	.AND. i == nxr-1 ) .OR. &
	1320	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1321	.AND. i == nxlu+1) ) &
	1322	THEN
[861]	1323	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1324	!
	1325	!-- Clear flag for WS1
	1326	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1327	ELSE
	1328	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1329	!
	1330	!-- Clear flag for WS1
	1331	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1332	ENDIF
	1333	!
	1334	!-- u component - y-direction
	1335	!-- WS1 (12), WS3 (13), WS5 (14)
[1762]	1336	IF ( k <= nzb_u_inner(j+1,i) .OR. &
	1337	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1338	.AND. j == nys ) .OR. &
	1339	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1340	.AND. j == nyn ) ) &
	1341	THEN
	1342	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1343	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[1762]	1344	.OR. &
	1345	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1346	.AND. j == nysv ) .OR. &
	1347	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1348	.AND. j == nyn-1 ) ) &
	1349	THEN
[861]	1350	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1351	!
	1352	!-- Clear flag for WS1
	1353	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1354	ELSE
	1355	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1356	!
	1357	!-- Clear flag for WS1
	1358	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1359	ENDIF
	1360	!
	1361	!-- u component - z-direction
	1362	!-- WS1 (15), WS3 (16), WS5 (17)
	1363	flag_set = .FALSE.
	1364	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1365	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1366	flag_set = .TRUE.
	1367	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1368	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1369	flag_set = .TRUE.
	1370	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1371	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1372	ENDIF
	1373
	1374	ENDDO
	1375	ENDDO
	1376	ENDDO
	1377
	1378	DO i = nxl, nxr
	1379	DO j = nys, nyn
[1580]	1380	DO k = nzb+1, nzt
[861]	1381	!
[1580]	1382	!-- At first, set flags to WS1.
	1383	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1384	!-- in order to handle the left/south flux.
	1385	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1386	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1387	!
[861]	1388	!-- v component - x-direction
	1389	!-- WS1 (18), WS3 (19), WS5 (20)
[1762]	1390	IF ( k <= nzb_v_inner(j,i+1) .OR. &
	1391	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1392	.AND. i == nxl ) .OR. &
	1393	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1394	.AND. i == nxr ) ) &
	1395	THEN
	1396	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1397	!
[861]	1398	!-- WS3
	1399	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[1762]	1400	.OR. &
	1401	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1402	.AND. i == nxr-1 ) .OR. &
	1403	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1404	.AND. i == nxlu ) ) &
	1405	THEN
[861]	1406	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1407	!
	1408	!-- Clear flag for WS1
	1409	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1410	ELSE
	1411	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1412	!
	1413	!-- Clear flag for WS1
	1414	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1415	ENDIF
	1416	!
	1417	!-- v component - y-direction
	1418	!-- WS1 (21), WS3 (22), WS5 (23)
[1762]	1419	IF ( k <= nzb_v_inner(j+1,i) .OR. &
	1420	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1421	.AND. j <= nysv ) .OR. &
	1422	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1423	.AND. j == nyn ) ) &
	1424	THEN
	1425	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1426	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[1762]	1427	.OR. &
	1428	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1429	.AND. j == nysv+1) .OR. &
	1430	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1431	.AND. j == nyn-1 ) ) &
	1432	THEN
[861]	1433	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1434	!
	1435	!-- Clear flag for WS1
	1436	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1437	ELSE
	1438	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1439	!
	1440	!-- Clear flag for WS1
	1441	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1442	ENDIF
	1443	!
	1444	!-- v component - z-direction
	1445	!-- WS1 (24), WS3 (25), WS5 (26)
	1446	flag_set = .FALSE.
	1447	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1448	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1449	flag_set = .TRUE.
	1450	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1451	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1452	flag_set = .TRUE.
	1453	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1454	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1455	ENDIF
	1456
	1457	ENDDO
	1458	ENDDO
	1459	ENDDO
	1460	DO i = nxl, nxr
	1461	DO j = nys, nyn
[1580]	1462	DO k = nzb+1, nzt
[861]	1463	!
[1580]	1464	!-- At first, set flags to WS1.
	1465	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1466	!-- in order to handle the left/south flux.
	1467	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1468	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1469	!
[861]	1470	!-- w component - x-direction
	1471	!-- WS1 (27), WS3 (28), WS5 (29)
[1762]	1472	IF ( k <= nzb_w_inner(j,i+1) .OR. &
	1473	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1474	.AND. i == nxl ) .OR. &
	1475	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1476	.AND. i == nxr ) ) &
	1477	THEN
	1478	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1479	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[1762]	1480	.OR. &
	1481	( ( inflow_r .OR. outflow_r .OR. nest_bound_r ) &
	1482	.AND. i == nxr-1 ) .OR. &
	1483	( ( inflow_l .OR. outflow_l .OR. nest_bound_l ) &
	1484	.AND. i == nxlu ) ) &
	1485	THEN
[861]	1486	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1487	!
	1488	!-- Clear flag for WS1
	1489	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1490	ELSE
	1491	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1492	!
	1493	!-- Clear flag for WS1
	1494	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1495	ENDIF
	1496	!
	1497	!-- w component - y-direction
	1498	!-- WS1 (30), WS3 (31), WS5 (32)
[1762]	1499	IF ( k <= nzb_w_inner(j+1,i) .OR. &
	1500	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1501	.AND. j == nys ) .OR. &
	1502	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1503	.AND. j == nyn ) ) &
	1504	THEN
	1505	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1506	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[1762]	1507	.OR. &
	1508	( ( inflow_s .OR. outflow_s .OR. nest_bound_s ) &
	1509	.AND. j == nysv ) .OR. &
	1510	( ( inflow_n .OR. outflow_n .OR. nest_bound_n ) &
	1511	.AND. j == nyn-1 ) ) &
	1512	THEN
[861]	1513	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1514	!
	1515	!-- Clear flag for WS1
	1516	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1517	ELSE
[1221]	1518	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1519	!
	1520	!-- Clear flag for WS1
	1521	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1522	ENDIF
	1523	!
	1524	!-- w component - z-direction
[1679]	1525	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1526	flag_set = .FALSE.
	1527	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1528	.OR. k == nzt ) THEN
	1529	!
	1530	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1531	!-- set, although this is not a prognostic level. However,
	1532	!-- contrary to the advection of u,v and s this is necessary
	1533	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1534	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1535	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1536	flag_set = .TRUE.
	1537	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1538	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1539	flag_set = .TRUE.
	1540	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1541	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1542	ENDIF
	1543
	1544	ENDDO
	1545	ENDDO
	1546	ENDDO
	1547
	1548	ENDIF
	1549
	1550	!
[1677]	1551	!-- Exchange 3D integer wall_flags.
	1552	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1553	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1554	!
	1555	!-- Exchange ghost points for advection flags
	1556	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1557	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1558	!
	1559	!-- Set boundary flags at inflow and outflow boundary in case of
	1560	!-- non-cyclic boundary conditions.
[1762]	1561	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
[1677]	1562	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1563	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1564	ENDIF
	1565
[1762]	1566	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) THEN
[1677]	1567	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1568	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1569	ENDIF
	1570
[1762]	1571	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) THEN
[1677]	1572	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1573	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1574	ENDIF
	1575
[1762]	1576	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
[1677]	1577	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1578	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1579	ENDIF
	1580
	1581	ENDIF
	1582
	1583	!
[1]	1584	!-- In case of topography: limit near-wall mixing length l_wall further:
	1585	!-- Go through all points of the subdomain one by one and look for the closest
	1586	!-- surface
	1587	IF ( TRIM(topography) /= 'flat' ) THEN
	1588	DO i = nxl, nxr
	1589	DO j = nys, nyn
	1590
	1591	nzb_si = nzb_s_inner(j,i)
	1592	vi = vertical_influence(nzb_si)
	1593
	1594	IF ( wall_n(j,i) > 0 ) THEN
	1595	!
	1596	!-- North wall (y distance)
	1597	DO k = wall_n(j,i), nzb_si
[1353]	1598	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1599	ENDDO
	1600	!
	1601	!-- Above North wall (yz distance)
	1602	DO k = nzb_si + 1, nzb_si + vi
[1353]	1603	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1604	SQRT( 0.25_wp * dy**2 + &
[1]	1605	( zu(k) - zw(nzb_si) )**2 ) )
	1606	ENDDO
	1607	!
	1608	!-- Northleft corner (xy distance)
	1609	IF ( corner_nl(j,i) > 0 ) THEN
	1610	DO k = corner_nl(j,i), nzb_si
	1611	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1612	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1613	ENDDO
	1614	!
	1615	!-- Above Northleft corner (xyz distance)
	1616	DO k = nzb_si + 1, nzb_si + vi
[1353]	1617	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1618	SQRT( 0.25_wp * (dx2 + dy2) + &
	1619	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1620	ENDDO
	1621	ENDIF
	1622	!
	1623	!-- Northright corner (xy distance)
	1624	IF ( corner_nr(j,i) > 0 ) THEN
	1625	DO k = corner_nr(j,i), nzb_si
[1353]	1626	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1627	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1628	ENDDO
	1629	!
	1630	!-- Above northright corner (xyz distance)
	1631	DO k = nzb_si + 1, nzb_si + vi
[1353]	1632	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1633	SQRT( 0.25_wp * (dx2 + dy2) + &
	1634	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1635	ENDDO
	1636	ENDIF
	1637	ENDIF
	1638
	1639	IF ( wall_s(j,i) > 0 ) THEN
	1640	!
	1641	!-- South wall (y distance)
	1642	DO k = wall_s(j,i), nzb_si
[1353]	1643	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1644	ENDDO
	1645	!
	1646	!-- Above south wall (yz distance)
[1353]	1647	DO k = nzb_si + 1, nzb_si + vi
	1648	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1649	SQRT( 0.25_wp * dy**2 + &
[1]	1650	( zu(k) - zw(nzb_si) )**2 ) )
	1651	ENDDO
	1652	!
	1653	!-- Southleft corner (xy distance)
	1654	IF ( corner_sl(j,i) > 0 ) THEN
	1655	DO k = corner_sl(j,i), nzb_si
[1353]	1656	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1657	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1658	ENDDO
	1659	!
	1660	!-- Above southleft corner (xyz distance)
	1661	DO k = nzb_si + 1, nzb_si + vi
[1353]	1662	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1663	SQRT( 0.25_wp * (dx2 + dy2) + &
	1664	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1665	ENDDO
	1666	ENDIF
	1667	!
	1668	!-- Southright corner (xy distance)
	1669	IF ( corner_sr(j,i) > 0 ) THEN
	1670	DO k = corner_sr(j,i), nzb_si
[1353]	1671	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1672	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1673	ENDDO
	1674	!
	1675	!-- Above southright corner (xyz distance)
	1676	DO k = nzb_si + 1, nzb_si + vi
[1353]	1677	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1678	SQRT( 0.25_wp * (dx2 + dy2) + &
	1679	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1680	ENDDO
	1681	ENDIF
	1682
	1683	ENDIF
	1684
	1685	IF ( wall_l(j,i) > 0 ) THEN
	1686	!
	1687	!-- Left wall (x distance)
	1688	DO k = wall_l(j,i), nzb_si
[1353]	1689	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1690	ENDDO
	1691	!
	1692	!-- Above left wall (xz distance)
	1693	DO k = nzb_si + 1, nzb_si + vi
[1353]	1694	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1695	SQRT( 0.25_wp * dx**2 + &
	1696	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1697	ENDDO
	1698	ENDIF
	1699
	1700	IF ( wall_r(j,i) > 0 ) THEN
	1701	!
	1702	!-- Right wall (x distance)
	1703	DO k = wall_r(j,i), nzb_si
[1353]	1704	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1705	ENDDO
	1706	!
	1707	!-- Above right wall (xz distance)
	1708	DO k = nzb_si + 1, nzb_si + vi
[1353]	1709	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1710	SQRT( 0.25_wp * dx**2 + &
[1]	1711	( zu(k) - zw(nzb_si) )**2 ) )
	1712	ENDDO
	1713
	1714	ENDIF
	1715
	1716	ENDDO
	1717	ENDDO
	1718
	1719	ENDIF
	1720
	1721	!
	1722	!-- Multiplication with wall_adjustment_factor
	1723	l_wall = wall_adjustment_factor * l_wall
	1724
	1725	!
[709]	1726	!-- Set lateral boundary conditions for l_wall
[667]	1727	CALL exchange_horiz( l_wall, nbgp )
	1728
[1]	1729	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1730	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1731
[807]	1732	#endif
[1]	1733
	1734	END SUBROUTINE init_grid

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