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source: palm/trunk/SOURCE/init_grid.f90 @ 1752

Last change on this file since 1752 was 1744, checked in by raasch, 9 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	! -----------------
[1581]	21	!
[1744]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: init_grid.f90 1744 2016-01-13 10:29:35Z maronga $
	26	!
[1744]	27	! 1743 2016-01-13 10:23:51Z raasch
	28	! Bugfix for calculation of nzb_s_outer and nzb_u_outer at north boundary of
	29	! total domain
	30	!
[1692]	31	! 1691 2015-10-26 16:17:44Z maronga
	32	! Renamed prandtl_layer to constant_flux_layer.
	33	!
[1683]	34	! 1682 2015-10-07 23:56:08Z knoop
	35	! Code annotations made doxygen readable
	36	!
[1678]	37	! 1677 2015-10-02 13:25:23Z boeske
	38	! Bugfix: Ghost points are included in wall_flags_0 and wall_flags_00
	39	!
[1676]	40	! 1675 2015-10-02 08:28:59Z gronemeier
	41	! Bugfix: Definition of topography grid levels
	42	!
[1662]	43	! 1660 2015-09-21 08:15:16Z gronemeier
	44	! Bugfix: Definition of topography grid levels if vertical grid stretching
	45	! starts below the maximum topography height.
	46	!
[1581]	47	! 1580 2015-04-10 13:43:49Z suehring
	48	! Bugfix: setting flags for 5th order scheme near buildings
	49	!
[1576]	50	! 1575 2015-03-27 09:56:27Z raasch
	51	! adjustments for psolver-queries
	52	!
[1558]	53	! 1557 2015-03-05 16:43:04Z suehring
	54	! Adjustment for monotoinic limiter
	55	!
[1419]	56	! 1418 2014-06-06 13:05:08Z fricke
	57	! Bugfix: Change if-condition for stretched grid in the ocean, with the old
	58	! condition and a negative value for dz_stretch_level the condition
	59	! was always true for the whole model domain
	60	!
[1410]	61	! 1409 2014-05-23 12:11:32Z suehring
	62	! Bugfix: set wall_flags_0 at inflow and outflow boundary also for i <= nxlu
	63	! j <= nysv
	64	!
[1354]	65	! 1353 2014-04-08 15:21:23Z heinze
	66	! REAL constants provided with KIND-attribute
	67	!
[1323]	68	! 1322 2014-03-20 16:38:49Z raasch
	69	! REAL constants defined as wp-kind
	70	!
[1321]	71	! 1320 2014-03-20 08:40:49Z raasch
[1320]	72	! ONLY-attribute added to USE-statements,
	73	! kind-parameters added to all INTEGER and REAL declaration statements,
	74	! kinds are defined in new module kinds,
	75	! revision history before 2012 removed,
	76	! comment fields (!:) to be used for variable explanations added to
	77	! all variable declaration statements
[1321]	78	!
[1222]	79	! 1221 2013-09-10 08:59:13Z raasch
	80	! wall_flags_00 introduced to hold bits 32-63,
	81	! additional 3D-flag arrays for replacing the 2D-index array nzb_s_inner in
	82	! loops optimized for openACC (pres + flow_statistics)
	83	!
[1093]	84	! 1092 2013-02-02 11:24:22Z raasch
	85	! unused variables removed
	86	!
[1070]	87	! 1069 2012-11-28 16:18:43Z maronga
	88	! bugfix: added coupling_char to TOPOGRAPHY_DATA to allow topography in the ocean
	89	! model in case of coupled runs
	90	!
[1037]	91	! 1036 2012-10-22 13:43:42Z raasch
	92	! code put under GPL (PALM 3.9)
	93	!
[1017]	94	! 1015 2012-09-27 09:23:24Z raasch
	95	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	96	! nzb_w_inner+1
	97	!
[997]	98	! 996 2012-09-07 10:41:47Z raasch
	99	! little reformatting
	100	!
[979]	101	! 978 2012-08-09 08:28:32Z fricke
	102	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	103	! Bugfix: Set wall_flags_0 for inflow boundary
	104	!
[928]	105	! 927 2012-06-06 19:15:04Z raasch
	106	! Wall flags are not set for multigrid method in case of masking method
	107	!
[865]	108	! 864 2012-03-27 15:10:33Z gryschka
[927]	109	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	110	! were not correctly defined for k=1.
[865]	111	!
[863]	112	! 861 2012-03-26 14:18:34Z suehring
[861]	113	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	114	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	115	! model domain.!
[861]	116	! Initialization of nzb_s_inner and nzb_w_inner.
	117	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	118	! while setting wall_flags_0
	119	!
[844]	120	! 843 2012-02-29 15:16:21Z gryschka
	121	! In case of ocean and dirichlet bc for u and v at the bottom
	122	! the first u-level ist defined at same height as the first w-level
	123	!
[819]	124	! 818 2012-02-08 16:11:23Z maronga
	125	! Bugfix: topo_height is only required if topography is used. It is thus now
	126	! allocated in the topography branch
	127	!
[810]	128	! 809 2012-01-30 13:32:58Z maronga
	129	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	130	!
[808]	131	! 807 2012-01-25 11:53:51Z maronga
	132	! New cpp directive "__check" implemented which is used by check_namelist_files
	133	!
[1]	134	! Revision 1.1 1997/08/11 06:17:45 raasch
	135	! Initial revision (Testversion)
	136	!
	137	!
	138	! Description:
	139	! ------------
[1682]	140	!> Creating grid depending constants
[1]	141	!------------------------------------------------------------------------------!
[1682]	142	SUBROUTINE init_grid
	143
[1]	144
[1320]	145	USE arrays_3d, &
	146	ONLY: dd2zu, ddzu, ddzu_pres, ddzw, dzu, dzu_mg, dzw, dzw_mg, f1_mg, &
	147	f2_mg, f3_mg, l_grid, l_wall, zu, zw
	148
[1353]	149	USE control_parameters, &
[1320]	150	ONLY: bc_lr, bc_ns, building_height, building_length_x, &
	151	building_length_y, building_wall_left, building_wall_south, &
	152	canyon_height, canyon_wall_left, canyon_wall_south, &
[1691]	153	canyon_width_x, canyon_width_y, constant_flux_layer, &
	154	coupling_char, dp_level_ind_b, dz, dz_max, dz_stretch_factor, &
	155	dz_stretch_level, dz_stretch_level_index, ibc_uv_b, io_blocks, &
	156	io_group, inflow_l, inflow_n, inflow_r, inflow_s, &
	157	masking_method, maximum_grid_level, message_string, &
	158	momentum_advec, ocean, outflow_l, outflow_n, outflow_r, &
	159	outflow_s, psolver, scalar_advec, topography, &
	160	topography_grid_convention, use_surface_fluxes, use_top_fluxes, &
	161	wall_adjustment_factor
[1320]	162
	163	USE grid_variables, &
	164	ONLY: ddx, ddx2, ddx2_mg, ddy, ddy2, ddy2_mg, dx, dx2, dy, dy2, fwxm, &
	165	fwxp, fwym, fwyp, fxm, fxp, fym, fyp, wall_e_x, wall_e_y, &
	166	wall_u, wall_v, wall_w_x, wall_w_y, zu_s_inner, zw_w_inner
	167
	168	USE indices, &
	169	ONLY: flags, nbgp, nx, nxl, nxlg, nxlu, nxl_mg, nxr, nxrg, nxr_mg, &
	170	ny, nyn, nyng, nyn_mg, nys, nysv, nys_mg, nysg, nz, nzb, &
	171	nzb_2d, nzb_diff, nzb_diff_s_inner, nzb_diff_s_outer, &
	172	nzb_diff_u, nzb_diff_v, nzb_max, nzb_s_inner, nzb_s_outer, &
	173	nzb_u_inner, nzb_u_outer, nzb_v_inner, nzb_v_outer, &
	174	nzb_w_inner, nzb_w_outer, nzt, nzt_diff, nzt_mg, rflags_invers, &
	175	rflags_s_inner, wall_flags_0, wall_flags_00, wall_flags_1, &
	176	wall_flags_10, wall_flags_2, wall_flags_3, wall_flags_4, &
	177	wall_flags_5, wall_flags_6, wall_flags_7, wall_flags_8, &
	178	wall_flags_9
	179
	180	USE kinds
	181
[1]	182	USE pegrid
	183
	184	IMPLICIT NONE
	185
[1682]	186	INTEGER(iwp) :: bh !<
	187	INTEGER(iwp) :: blx !<
	188	INTEGER(iwp) :: bly !<
	189	INTEGER(iwp) :: bxl !<
	190	INTEGER(iwp) :: bxr !<
	191	INTEGER(iwp) :: byn !<
	192	INTEGER(iwp) :: bys !<
	193	INTEGER(iwp) :: ch !<
	194	INTEGER(iwp) :: cwx !<
	195	INTEGER(iwp) :: cwy !<
	196	INTEGER(iwp) :: cxl !<
	197	INTEGER(iwp) :: cxr !<
	198	INTEGER(iwp) :: cyn !<
	199	INTEGER(iwp) :: cys !<
	200	INTEGER(iwp) :: gls !<
	201	INTEGER(iwp) :: i !<
	202	INTEGER(iwp) :: ii !<
	203	INTEGER(iwp) :: inc !<
	204	INTEGER(iwp) :: j !<
	205	INTEGER(iwp) :: k !<
	206	INTEGER(iwp) :: l !<
	207	INTEGER(iwp) :: nxl_l !<
	208	INTEGER(iwp) :: nxr_l !<
	209	INTEGER(iwp) :: nyn_l !<
	210	INTEGER(iwp) :: nys_l !<
	211	INTEGER(iwp) :: nzb_si !<
	212	INTEGER(iwp) :: nzt_l !<
	213	INTEGER(iwp) :: vi !<
[1]	214
[1682]	215	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: vertical_influence !<
[1]	216
[1682]	217	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nl !<
	218	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_nr !<
	219	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sl !<
	220	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: corner_sr !<
	221	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_l !<
	222	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_n !<
	223	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_r !<
	224	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: wall_s !<
	225	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_local !<
	226	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: nzb_tmp !<
[1]	227
[1682]	228	LOGICAL :: flag_set = .FALSE. !<
[861]	229
[1682]	230	REAL(wp) :: dx_l !<
	231	REAL(wp) :: dy_l !<
	232	REAL(wp) :: dz_stretched !<
[1]	233
[1682]	234	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: topo_height !<
[1]	235
[667]	236
[1]	237	!
[709]	238	!-- Calculation of horizontal array bounds including ghost layers
[667]	239	nxlg = nxl - nbgp
	240	nxrg = nxr + nbgp
	241	nysg = nys - nbgp
	242	nyng = nyn + nbgp
[709]	243
[667]	244	!
[1]	245	!-- Allocate grid arrays
[1353]	246	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	247	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	248
	249	!
	250	!-- Compute height of u-levels from constant grid length and dz stretch factors
[1353]	251	IF ( dz == -1.0_wp ) THEN
[254]	252	message_string = 'missing dz'
	253	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1353]	254	ELSEIF ( dz <= 0.0_wp ) THEN
[254]	255	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	256	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	257	ENDIF
[94]	258
[1]	259	!
[94]	260	!-- Define the vertical grid levels
	261	IF ( .NOT. ocean ) THEN
	262	!
	263	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	264	!-- The second u-level (k=1) corresponds to the top of the
[94]	265	!-- Prandtl-layer.
[667]	266
	267	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
[1353]	268	zu(0) = 0.0_wp
	269	! zu(0) = - dz * 0.5_wp
[667]	270	ELSE
[1353]	271	zu(0) = - dz * 0.5_wp
[667]	272	ENDIF
[1353]	273	zu(1) = dz * 0.5_wp
[1]	274
[94]	275	dz_stretch_level_index = nzt+1
	276	dz_stretched = dz
	277	DO k = 2, nzt+1
	278	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	279	dz_stretched = dz_stretched * dz_stretch_factor
	280	dz_stretched = MIN( dz_stretched, dz_max )
	281	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	282	ENDIF
	283	zu(k) = zu(k-1) + dz_stretched
	284	ENDDO
[1]	285
	286	!
[94]	287	!-- Compute the w-levels. They are always staggered half-way between the
[843]	288	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	289	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	290	!-- The top w-level is extrapolated linearly.
[1353]	291	zw(0) = 0.0_wp
[94]	292	DO k = 1, nzt
[1353]	293	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	294	ENDDO
[1353]	295	zw(nzt+1) = zw(nzt) + 2.0_wp * ( zu(nzt+1) - zw(nzt) )
[1]	296
[94]	297	ELSE
[1]	298	!
[843]	299	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	300	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	301	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	302	!-- w-level are defined at same height, but staggered from the second level.
	303	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[1353]	304	zu(nzt+1) = dz * 0.5_wp
	305	zu(nzt) = - dz * 0.5_wp
[94]	306
	307	dz_stretch_level_index = 0
	308	dz_stretched = dz
	309	DO k = nzt-1, 0, -1
[1418]	310	!
	311	!-- The default value of dz_stretch_level is positive, thus the first
	312	!-- condition is always true. Hence, the second condition is necessary.
	313	IF ( dz_stretch_level >= zu(k+1) .AND. dz_stretch_level <= 0.0 &
	314	.AND. dz_stretched < dz_max ) THEN
[94]	315	dz_stretched = dz_stretched * dz_stretch_factor
	316	dz_stretched = MIN( dz_stretched, dz_max )
	317	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	318	ENDIF
	319	zu(k) = zu(k+1) - dz_stretched
	320	ENDDO
	321
	322	!
	323	!-- Compute the w-levels. They are always staggered half-way between the
[843]	324	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	325	!-- at the ground. In this case the first u- and w-level are defined at
	326	!-- same height. The top w-level (nzt+1) is not used but set for
	327	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	328	zw(nzt+1) = dz
[1353]	329	zw(nzt) = 0.0_wp
[94]	330	DO k = 0, nzt
[1353]	331	zw(k) = ( zu(k) + zu(k+1) ) * 0.5_wp
[94]	332	ENDDO
	333
[843]	334	!
	335	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	336	!-- at same height.
	337	IF ( ibc_uv_b == 0 ) THEN
	338	zu(0) = zw(0)
	339	ENDIF
	340
[94]	341	ENDIF
	342
	343	!
[1]	344	!-- Compute grid lengths.
	345	DO k = 1, nzt+1
	346	dzu(k) = zu(k) - zu(k-1)
[1353]	347	ddzu(k) = 1.0_wp / dzu(k)
[1]	348	dzw(k) = zw(k) - zw(k-1)
[1353]	349	ddzw(k) = 1.0_wp / dzw(k)
[1]	350	ENDDO
	351
	352	DO k = 1, nzt
[1353]	353	dd2zu(k) = 1.0_wp / ( dzu(k) + dzu(k+1) )
[1]	354	ENDDO
[667]	355
	356	!
[709]	357	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	358	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	359	!-- is only dz/2, but should be dz. Therefore, an additional array
	360	!-- containing with appropriate grid information is created for these
	361	!-- solvers.
[1575]	362	IF ( psolver(1:9) /= 'multigrid' ) THEN
[667]	363	ALLOCATE( ddzu_pres(1:nzt+1) )
	364	ddzu_pres = ddzu
[864]	365	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	366	ENDIF
[1]	367
	368	!
	369	!-- In case of multigrid method, compute grid lengths and grid factors for the
	370	!-- grid levels
[1575]	371	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	372
	373	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	374	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	375	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	376	f1_mg(nzb+1:nzt,maximum_grid_level), &
	377	f2_mg(nzb+1:nzt,maximum_grid_level), &
	378	f3_mg(nzb+1:nzt,maximum_grid_level) )
	379
	380	dzu_mg(:,maximum_grid_level) = dzu
[667]	381	!
[864]	382	!-- Next line to ensure an equally spaced grid.
	383	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	384
[1]	385	dzw_mg(:,maximum_grid_level) = dzw
	386	nzt_l = nzt
	387	DO l = maximum_grid_level-1, 1, -1
[1353]	388	dzu_mg(nzb+1,l) = 2.0_wp * dzu_mg(nzb+1,l+1)
	389	dzw_mg(nzb+1,l) = 2.0_wp * dzw_mg(nzb+1,l+1)
[1]	390	nzt_l = nzt_l / 2
	391	DO k = 2, nzt_l+1
	392	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	393	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	394	ENDDO
	395	ENDDO
	396
	397	nzt_l = nzt
	398	dx_l = dx
	399	dy_l = dy
	400	DO l = maximum_grid_level, 1, -1
[1353]	401	ddx2_mg(l) = 1.0_wp / dx_l**2
	402	ddy2_mg(l) = 1.0_wp / dy_l**2
[1]	403	DO k = nzb+1, nzt_l
[1353]	404	f2_mg(k,l) = 1.0_wp / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	405	f3_mg(k,l) = 1.0_wp / ( dzu_mg(k,l) * dzw_mg(k,l) )
	406	f1_mg(k,l) = 2.0_wp * ( ddx2_mg(l) + ddy2_mg(l) ) + &
[1]	407	f2_mg(k,l) + f3_mg(k,l)
	408	ENDDO
	409	nzt_l = nzt_l / 2
[1353]	410	dx_l = dx_l * 2.0_wp
	411	dy_l = dy_l * 2.0_wp
[1]	412	ENDDO
	413
	414	ENDIF
	415
	416	!
	417	!-- Compute the reciprocal values of the horizontal grid lengths.
[1353]	418	ddx = 1.0_wp / dx
	419	ddy = 1.0_wp / dy
[1]	420	dx2 = dx * dx
	421	dy2 = dy * dy
[1353]	422	ddx2 = 1.0_wp / dx2
	423	ddy2 = 1.0_wp / dy2
[1]	424
	425	!
	426	!-- Compute the grid-dependent mixing length.
	427	DO k = 1, nzt
[1322]	428	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333_wp
[1]	429	ENDDO
	430
	431	!
	432	!-- Allocate outer and inner index arrays for topography and set
[114]	433	!-- defaults.
	434	!-- nzb_local has to contain additional layers of ghost points for calculating
	435	!-- the flag arrays needed for the multigrid method
	436	gls = 2**( maximum_grid_level )
[861]	437	IF ( gls < nbgp ) gls = nbgp
[667]	438
[114]	439	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	440	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	441	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	442	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	443	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	444	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	445	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	446	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	447	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	448	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	449	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	450	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	451	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	452	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	453	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	454	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	455	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	456	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	457	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	458	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	459	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	460	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	461	nzb_2d(nysg:nyng,nxlg:nxrg), &
[1221]	462	rflags_s_inner(nzb:nzt+2,nysg:nyng,nxlg:nxrg), &
	463	rflags_invers(nysg:nyng,nxlg:nxrg,nzb:nzt+2), &
[667]	464	wall_e_x(nysg:nyng,nxlg:nxrg), &
	465	wall_e_y(nysg:nyng,nxlg:nxrg), &
	466	wall_u(nysg:nyng,nxlg:nxrg), &
	467	wall_v(nysg:nyng,nxlg:nxrg), &
	468	wall_w_x(nysg:nyng,nxlg:nxrg), &
	469	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	470
	471
[667]	472
	473	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	474
[818]	475
[1]	476	nzb_s_inner = nzb; nzb_s_outer = nzb
	477	nzb_u_inner = nzb; nzb_u_outer = nzb
	478	nzb_v_inner = nzb; nzb_v_outer = nzb
	479	nzb_w_inner = nzb; nzb_w_outer = nzb
	480
[1353]	481	rflags_s_inner = 1.0_wp
	482	rflags_invers = 1.0_wp
[1221]	483
[1]	484	!
[19]	485	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	486	!-- form (which does not use surface fluxes) is applied
[1691]	487	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	488	nzb_diff = nzb + 2
	489	ELSE
	490	nzb_diff = nzb + 1
	491	ENDIF
[19]	492	IF ( use_top_fluxes ) THEN
	493	nzt_diff = nzt - 1
	494	ELSE
	495	nzt_diff = nzt
	496	ENDIF
[1]	497
	498	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	499	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	500
[1353]	501	wall_e_x = 0.0_wp; wall_e_y = 0.0_wp; wall_u = 0.0_wp; wall_v = 0.0_wp
	502	wall_w_x = 0.0_wp; wall_w_y = 0.0_wp
	503	fwxp = 1.0_wp; fwxm = 1.0_wp; fwyp = 1.0_wp; fwym = 1.0_wp
	504	fxp = 1.0_wp; fxm = 1.0_wp; fyp = 1.0_wp; fym = 1.0_wp
[1]	505
	506	!
	507	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	508	!-- for the moment,
	509	!-- multiplication with wall_adjustment_factor near the end of this routine
	510	l_wall(nzb,:,:) = l_grid(1)
	511	DO k = nzb+1, nzt
	512	l_wall(k,:,:) = l_grid(k)
	513	ENDDO
	514	l_wall(nzt+1,:,:) = l_grid(nzt)
	515
	516	ALLOCATE ( vertical_influence(nzb:nzt) )
	517	DO k = 1, nzt
	518	vertical_influence(k) = MIN ( INT( l_grid(k) / &
[1353]	519	( wall_adjustment_factor * dzw(k) ) + 0.5_wp ), nzt - k )
[1]	520	ENDDO
	521
	522	DO k = 1, MAXVAL( nzb_s_inner )
[1353]	523	IF ( l_grid(k) > 1.5_wp * dx * wall_adjustment_factor .OR. &
	524	l_grid(k) > 1.5_wp * dy * wall_adjustment_factor ) THEN
[254]	525	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	526	'threshold given by only local', &
	527	' &horizontal reduction of near_wall ', &
	528	'mixing length l_wall', &
	529	' &starting from height level k = ', k, '.'
	530	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	531	EXIT
	532	ENDIF
	533	ENDDO
	534	vertical_influence(0) = vertical_influence(1)
	535
[667]	536	DO i = nxlg, nxrg
	537	DO j = nysg, nyng
[1]	538	DO k = nzb_s_inner(j,i) + 1, &
	539	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	540	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	541	ENDDO
	542	ENDDO
	543	ENDDO
	544
	545	!
	546	!-- Set outer and inner index arrays for non-flat topography.
	547	!-- Here consistency checks concerning domain size and periodicity are
	548	!-- necessary.
	549	!-- Within this SELECT CASE structure only nzb_local is initialized
	550	!-- individually depending on the chosen topography type, all other index
	551	!-- arrays are initialized further below.
	552	SELECT CASE ( TRIM( topography ) )
	553
	554	CASE ( 'flat' )
	555	!
[555]	556	!-- nzb_local is required for the multigrid solver
	557	nzb_local = 0
[1]	558
	559	CASE ( 'single_building' )
	560	!
	561	!-- Single rectangular building, by default centered in the middle of the
	562	!-- total domain
	563	blx = NINT( building_length_x / dx )
	564	bly = NINT( building_length_y / dy )
[1675]	565	bh = MINLOC( ABS( zw - building_height ), 1 ) - 1
	566	IF ( ABS( zw(bh ) - building_height ) == &
	567	ABS( zw(bh+1) - building_height ) ) bh = bh + 1
[1]	568
[1322]	569	IF ( building_wall_left == 9999999.9_wp ) THEN
[1]	570	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	571	ENDIF
	572	bxl = NINT( building_wall_left / dx )
	573	bxr = bxl + blx
	574
[1322]	575	IF ( building_wall_south == 9999999.9_wp ) THEN
[1]	576	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	577	ENDIF
	578	bys = NINT( building_wall_south / dy )
	579	byn = bys + bly
	580
	581	!
	582	!-- Building size has to meet some requirements
	583	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	584	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	585	WRITE( message_string, * ) 'inconsistent building parameters:', &
	586	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	587	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	588	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	589	ENDIF
	590
	591	!
[217]	592	!-- Define the building.
[1]	593	nzb_local = 0
[134]	594	nzb_local(bys:byn,bxl:bxr) = bh
[1]	595
[240]	596	CASE ( 'single_street_canyon' )
	597	!
	598	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	599	!-- The canyon is centered in the other direction by default.
[1322]	600	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	601	!
	602	!-- Street canyon in y direction
	603	cwx = NINT( canyon_width_x / dx )
[1322]	604	IF ( canyon_wall_left == 9999999.9_wp ) THEN
[240]	605	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	606	ENDIF
	607	cxl = NINT( canyon_wall_left / dx )
	608	cxr = cxl + cwx
	609
[1322]	610	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	611	!
	612	!-- Street canyon in x direction
	613	cwy = NINT( canyon_width_y / dy )
[1322]	614	IF ( canyon_wall_south == 9999999.9_wp ) THEN
[240]	615	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	616	ENDIF
	617	cys = NINT( canyon_wall_south / dy )
	618	cyn = cys + cwy
	619
	620	ELSE
[254]	621
	622	message_string = 'no street canyon width given'
	623	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	624
[240]	625	ENDIF
	626
[1675]	627	ch = MINLOC( ABS( zw - canyon_height ), 1 ) - 1
	628	IF ( ABS( zw(ch ) - canyon_height ) == &
	629	ABS( zw(ch+1) - canyon_height ) ) ch = ch + 1
	630
[240]	631	dp_level_ind_b = ch
	632	!
	633	!-- Street canyon size has to meet some requirements
[1322]	634	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[1353]	635	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
[240]	636	( ch < 3 ) ) THEN
[1353]	637	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	638	'&cxl=', cxl, 'cxr=', cxr, &
	639	'cwx=', cwx, &
[254]	640	'ch=', ch, 'nx=', nx, 'ny=', ny
	641	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	642	ENDIF
[1322]	643	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[1353]	644	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
[240]	645	( ch < 3 ) ) THEN
[1353]	646	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
	647	'&cys=', cys, 'cyn=', cyn, &
	648	'cwy=', cwy, &
[254]	649	'ch=', ch, 'nx=', nx, 'ny=', ny
	650	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	651	ENDIF
	652	ENDIF
[1353]	653	IF ( canyon_width_x /= 9999999.9_wp .AND. &
	654	canyon_width_y /= 9999999.9_wp ) THEN
	655	message_string = 'inconsistent canyon parameters:' // &
	656	'&street canyon can only be oriented' // &
[254]	657	'&either in x- or in y-direction'
	658	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	659	ENDIF
	660
	661	nzb_local = ch
[1322]	662	IF ( canyon_width_x /= 9999999.9_wp ) THEN
[240]	663	nzb_local(:,cxl+1:cxr-1) = 0
[1322]	664	ELSEIF ( canyon_width_y /= 9999999.9_wp ) THEN
[240]	665	nzb_local(cys+1:cyn-1,:) = 0
	666	ENDIF
	667
[1]	668	CASE ( 'read_from_file' )
[759]	669
[818]	670	ALLOCATE ( topo_height(0:ny,0:nx) )
	671
[759]	672	DO ii = 0, io_blocks-1
	673	IF ( ii == io_group ) THEN
	674
[1]	675	!
[759]	676	!-- Arbitrary irregular topography data in PALM format (exactly
	677	!-- matching the grid size and total domain size)
[1069]	678	OPEN( 90, FILE='TOPOGRAPHY_DATA'//coupling_char, STATUS='OLD', &
[759]	679	FORM='FORMATTED', ERR=10 )
	680	DO j = ny, 0, -1
	681	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	682	ENDDO
	683
	684	GOTO 12
	685
[1069]	686	10 message_string = 'file TOPOGRAPHY'//coupling_char//' does not exist'
[759]	687	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	688
[1069]	689	11 message_string = 'errors in file TOPOGRAPHY_DATA'//coupling_char
[759]	690	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	691
	692	12 CLOSE( 90 )
	693
	694	ENDIF
[809]	695	#if defined( __parallel ) && ! defined ( __check )
[759]	696	CALL MPI_BARRIER( comm2d, ierr )
	697	#endif
[559]	698	ENDDO
[759]	699
[1]	700	!
	701	!-- Calculate the index height of the topography
	702	DO i = 0, nx
	703	DO j = 0, ny
[1675]	704	nzb_local(j,i) = MINLOC( ABS( zw - topo_height(j,i) ), 1 ) - 1
	705	IF ( ABS( zw(nzb_local(j,i) ) - topo_height(j,i) ) == &
	706	ABS( zw(nzb_local(j,i)+1) - topo_height(j,i) ) ) &
	707	nzb_local(j,i) = nzb_local(j,i) + 1
[1]	708	ENDDO
	709	ENDDO
[818]	710
	711	DEALLOCATE ( topo_height )
[114]	712	!
[759]	713	!-- Add cyclic boundaries (additional layers are for calculating
	714	!-- flag arrays needed for the multigrid sover)
[114]	715	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	716	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	717	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	718	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	719
[1]	720	CASE DEFAULT
	721	!
	722	!-- The DEFAULT case is reached either if the parameter topography
[217]	723	!-- contains a wrong character string or if the user has defined a special
[1]	724	!-- case in the user interface. There, the subroutine user_init_grid
	725	!-- checks which of these two conditions applies.
[114]	726	CALL user_init_grid( gls, nzb_local )
[1]	727
	728	END SELECT
	729	!
[861]	730	!-- Determine the maximum level of topography. Furthermore it is used for
	731	!-- steering the degradation of order of the applied advection scheme.
[978]	732	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	733	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[1677]	734	nzb_max = MAXVAL( nzb_local ) + 1
[1353]	735	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
[978]	736	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	737	nzb_max = nzt
	738	ENDIF
	739
[861]	740	!
[1]	741	!-- Consistency checks and index array initialization are only required for
[217]	742	!-- non-flat topography, also the initialization of topography height arrays
[49]	743	!-- zu_s_inner and zw_w_inner
[1]	744	IF ( TRIM( topography ) /= 'flat' ) THEN
	745
	746	!
	747	!-- Consistency checks
	748	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[1353]	749	WRITE( message_string, * ) 'nzb_local values are outside the', &
	750	'model domain', &
	751	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
[274]	752	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	753	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	754	ENDIF
	755
[722]	756	IF ( bc_lr == 'cyclic' ) THEN
[1353]	757	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
[1]	758	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[1353]	759	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	760	' boundary condition in x-direction'
	761	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	762	ENDIF
	763	ENDIF
[722]	764	IF ( bc_ns == 'cyclic' ) THEN
[1353]	765	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
[1]	766	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[1353]	767	message_string = 'nzb_local does not fulfill cyclic' // &
[254]	768	' boundary condition in y-direction'
	769	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	770	ENDIF
	771	ENDIF
	772
[217]	773	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	774	!
[217]	775	!-- The array nzb_local as defined using the 'cell_edge' convention
	776	!-- describes the actual total size of topography which is defined at the
	777	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	778	!-- on the topography walls in y-direction. However, PALM uses individual
	779	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	780	!-- Therefore, the extent of topography in nzb_local is now reduced by
	781	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	782	!-- to form the basis for nzb_s_inner.
	783	DO j = -gls, ny + gls
	784	DO i = -gls, nx
	785	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	786	ENDDO
[134]	787	ENDDO
[217]	788	!-- apply cyclic boundary conditions in x-direction
	789	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	790	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	791	DO i = -gls, nx + gls
	792	DO j = -gls, ny
	793	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	794	ENDDO
[134]	795	ENDDO
[217]	796	!-- apply cyclic boundary conditions in y-direction
	797	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	798	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	799	ENDIF
[134]	800
[1]	801	!
	802	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	803	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	804	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	805
	806	!
	807	!-- Initialize remaining index arrays:
	808	!-- first pre-initialize them with nzb_s_inner...
	809	nzb_u_inner = nzb_s_inner
	810	nzb_u_outer = nzb_s_inner
	811	nzb_v_inner = nzb_s_inner
	812	nzb_v_outer = nzb_s_inner
	813	nzb_w_outer = nzb_s_inner
	814	nzb_s_outer = nzb_s_inner
	815
	816	!
	817	!-- ...then extend pre-initialized arrays in their according directions
	818	!-- based on nzb_local using nzb_tmp as a temporary global index array
	819
	820	!
	821	!-- nzb_s_outer:
	822	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	823	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	824	DO j = -1, ny + 1
	825	DO i = 0, nx
[1353]	826	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
[1]	827	nzb_local(j,i+1) )
	828	ENDDO
	829	ENDDO
	830	DO i = nxl, nxr
	831	DO j = nys, nyn
[1353]	832	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	833	nzb_tmp(j+1,i) )
	834	ENDDO
	835	!
	836	!-- non-cyclic boundary conditions (overwritten by call of
	837	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	838	IF ( nys == 0 ) THEN
	839	j = -1
	840	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	841	ENDIF
[1743]	842	IF ( nyn == ny ) THEN
[1]	843	j = ny + 1
	844	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	845	ENDIF
	846	ENDDO
	847	!
	848	!-- nzb_w_outer:
	849	!-- identical to nzb_s_outer
	850	nzb_w_outer = nzb_s_outer
	851
	852	!
	853	!-- nzb_u_inner:
	854	!-- extend nzb_local rightwards only
[667]	855	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	856	DO j = -1, ny + 1
	857	DO i = 0, nx + 1
	858	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	859	ENDDO
	860	ENDDO
[667]	861	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	862
	863	!
	864	!-- nzb_u_outer:
	865	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	866	DO i = nxl, nxr
	867	DO j = nys, nyn
[1353]	868	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
[1]	869	nzb_tmp(j+1,i) )
	870	ENDDO
	871	!
	872	!-- non-cyclic boundary conditions (overwritten by call of
	873	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	874	IF ( nys == 0 ) THEN
	875	j = -1
	876	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	877	ENDIF
[1743]	878	IF ( nyn == ny ) THEN
[1]	879	j = ny + 1
	880	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	881	ENDIF
	882	ENDDO
	883
	884	!
	885	!-- nzb_v_inner:
	886	!-- extend nzb_local northwards only
[667]	887	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	888	DO i = -1, nx + 1
	889	DO j = 0, ny + 1
	890	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	891	ENDDO
	892	ENDDO
[667]	893	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	894
	895	!
	896	!-- nzb_v_outer:
	897	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	898	DO j = nys, nyn
	899	DO i = nxl, nxr
[1353]	900	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
[1]	901	nzb_tmp(j,i+1) )
	902	ENDDO
	903	!
	904	!-- non-cyclic boundary conditions (overwritten by call of
	905	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	906	IF ( nxl == 0 ) THEN
	907	i = -1
	908	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	909	ENDIF
	910	IF ( nxr == nx ) THEN
	911	i = nx + 1
	912	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	913	ENDIF
	914	ENDDO
[809]	915	#if ! defined ( __check )
[1]	916	!
	917	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	918	!-- boundary conditions, if applicable.
	919	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	920	!-- they do not require exchange and are not included here.
	921	CALL exchange_horiz_2d_int( nzb_u_inner )
	922	CALL exchange_horiz_2d_int( nzb_u_outer )
	923	CALL exchange_horiz_2d_int( nzb_v_inner )
	924	CALL exchange_horiz_2d_int( nzb_v_outer )
	925	CALL exchange_horiz_2d_int( nzb_w_outer )
	926	CALL exchange_horiz_2d_int( nzb_s_outer )
	927
[49]	928	!
	929	!-- Allocate and set the arrays containing the topography height
	930	IF ( myid == 0 ) THEN
	931
	932	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	933
	934	DO i = 0, nx + 1
	935	DO j = 0, ny + 1
	936	zu_s_inner(i,j) = zu(nzb_local(j,i))
	937	zw_w_inner(i,j) = zw(nzb_local(j,i))
	938	ENDDO
	939	ENDDO
	940
	941	ENDIF
[1221]	942	!
	943	!-- Set flag arrays to be used for masking of grid points
	944	DO i = nxlg, nxrg
	945	DO j = nysg, nyng
	946	DO k = nzb, nzt+1
[1353]	947	IF ( k <= nzb_s_inner(j,i) ) rflags_s_inner(k,j,i) = 0.0_wp
	948	IF ( k <= nzb_s_inner(j,i) ) rflags_invers(j,i,k) = 0.0_wp
[1221]	949	ENDDO
	950	ENDDO
	951	ENDDO
[807]	952	#endif
[1]	953	ENDIF
	954
[809]	955	#if ! defined ( __check )
[1]	956	!
	957	!-- Preliminary: to be removed after completion of the topography code!
	958	!-- Set the former default k index arrays nzb_2d
	959	nzb_2d = nzb
	960
	961	!
	962	!-- Set the individual index arrays which define the k index from which on
	963	!-- the usual finite difference form (which does not use surface fluxes) is
	964	!-- applied
[1691]	965	IF ( constant_flux_layer .OR. use_surface_fluxes ) THEN
[1]	966	nzb_diff_u = nzb_u_inner + 2
	967	nzb_diff_v = nzb_v_inner + 2
	968	nzb_diff_s_inner = nzb_s_inner + 2
	969	nzb_diff_s_outer = nzb_s_outer + 2
	970	ELSE
	971	nzb_diff_u = nzb_u_inner + 1
	972	nzb_diff_v = nzb_v_inner + 1
	973	nzb_diff_s_inner = nzb_s_inner + 1
	974	nzb_diff_s_outer = nzb_s_outer + 1
	975	ENDIF
	976
	977	!
	978	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	979	!-- for limitation of near-wall mixing length l_wall further below
	980	corner_nl = 0
	981	corner_nr = 0
	982	corner_sl = 0
	983	corner_sr = 0
	984	wall_l = 0
	985	wall_n = 0
	986	wall_r = 0
	987	wall_s = 0
	988
	989	DO i = nxl, nxr
	990	DO j = nys, nyn
	991	!
	992	!-- u-component
	993	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
[1353]	994	wall_u(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	995	fym(j,i) = 0.0_wp
	996	fyp(j,i) = 1.0_wp
[1]	997	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
[1353]	998	wall_u(j,i) = 1.0_wp ! south wall (location of adjacent fluid)
	999	fym(j,i) = 1.0_wp
	1000	fyp(j,i) = 0.0_wp
[1]	1001	ENDIF
	1002	!
	1003	!-- v-component
	1004	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
[1353]	1005	wall_v(j,i) = 1.0_wp ! rigth wall (location of adjacent fluid)
	1006	fxm(j,i) = 0.0_wp
	1007	fxp(j,i) = 1.0_wp
[1]	1008	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
[1353]	1009	wall_v(j,i) = 1.0_wp ! left wall (location of adjacent fluid)
	1010	fxm(j,i) = 1.0_wp
	1011	fxp(j,i) = 0.0_wp
[1]	1012	ENDIF
	1013	!
	1014	!-- w-component, also used for scalars, separate arrays for shear
	1015	!-- production of tke
	1016	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
[1353]	1017	wall_e_y(j,i) = 1.0_wp ! north wall (location of adjacent fluid)
	1018	wall_w_y(j,i) = 1.0_wp
	1019	fwym(j,i) = 0.0_wp
	1020	fwyp(j,i) = 1.0_wp
[1]	1021	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
[1353]	1022	wall_e_y(j,i) = -1.0_wp ! south wall (location of adjacent fluid)
	1023	wall_w_y(j,i) = 1.0_wp
	1024	fwym(j,i) = 1.0_wp
	1025	fwyp(j,i) = 0.0_wp
[1]	1026	ENDIF
	1027	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
[1353]	1028	wall_e_x(j,i) = 1.0_wp ! right wall (location of adjacent fluid)
	1029	wall_w_x(j,i) = 1.0_wp
	1030	fwxm(j,i) = 0.0_wp
	1031	fwxp(j,i) = 1.0_wp
[1]	1032	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
[1353]	1033	wall_e_x(j,i) = -1.0_wp ! left wall (location of adjacent fluid)
	1034	wall_w_x(j,i) = 1.0_wp
	1035	fwxm(j,i) = 1.0_wp
	1036	fwxp(j,i) = 0.0_wp
[1]	1037	ENDIF
	1038	!
	1039	!-- Wall and corner locations inside buildings for limitation of
	1040	!-- near-wall mixing length l_wall
	1041	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	1042
	1043	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	1044
	1045	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1046	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	1047	nzb_s_inner(j,i-1) ) + 1
	1048	ENDIF
	1049
	1050	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1051	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	1052	nzb_s_inner(j,i+1) ) + 1
	1053	ENDIF
	1054
	1055	ENDIF
	1056
	1057	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	1058
	1059	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	1060	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1061	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	1062	nzb_s_inner(j,i-1) ) + 1
	1063	ENDIF
	1064
	1065	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1066	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	1067	nzb_s_inner(j,i+1) ) + 1
	1068	ENDIF
	1069
	1070	ENDIF
	1071
	1072	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	1073	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	1074	ENDIF
	1075
	1076	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	1077	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	1078	ENDIF
	1079
	1080	ENDDO
	1081	ENDDO
	1082
	1083	!
[114]	1084	!-- Calculate wall flag arrays for the multigrid method
[1575]	1085	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1086	!
	1087	!-- Gridpoint increment of the current level
	1088	inc = 1
	1089
	1090	DO l = maximum_grid_level, 1 , -1
	1091
	1092	nxl_l = nxl_mg(l)
	1093	nxr_l = nxr_mg(l)
	1094	nys_l = nys_mg(l)
	1095	nyn_l = nyn_mg(l)
	1096	nzt_l = nzt_mg(l)
	1097
	1098	!
	1099	!-- Assign the flag level to be calculated
	1100	SELECT CASE ( l )
	1101	CASE ( 1 )
	1102	flags => wall_flags_1
	1103	CASE ( 2 )
	1104	flags => wall_flags_2
	1105	CASE ( 3 )
	1106	flags => wall_flags_3
	1107	CASE ( 4 )
	1108	flags => wall_flags_4
	1109	CASE ( 5 )
	1110	flags => wall_flags_5
	1111	CASE ( 6 )
	1112	flags => wall_flags_6
	1113	CASE ( 7 )
	1114	flags => wall_flags_7
	1115	CASE ( 8 )
	1116	flags => wall_flags_8
	1117	CASE ( 9 )
	1118	flags => wall_flags_9
	1119	CASE ( 10 )
	1120	flags => wall_flags_10
	1121	END SELECT
	1122
	1123	!
	1124	!-- Depending on the grid level, set the respective bits in case of
	1125	!-- neighbouring walls
	1126	!-- Bit 0: wall to the bottom
	1127	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1128	!-- Bit 2: wall to the south
	1129	!-- Bit 3: wall to the north
	1130	!-- Bit 4: wall to the left
	1131	!-- Bit 5: wall to the right
[116]	1132	!-- Bit 6: inside building
[114]	1133
	1134	flags = 0
	1135
[927]	1136	!
	1137	!-- In case of masking method, flags are not set and multigrid method
	1138	!-- works like FFT-solver
	1139	IF ( .NOT. masking_method ) THEN
	1140
	1141	DO i = nxl_l-1, nxr_l+1
	1142	DO j = nys_l-1, nyn_l+1
	1143	DO k = nzb, nzt_l+1
[114]	1144
	1145	!
[927]	1146	!-- Inside/outside building (inside building does not need
	1147	!-- further tests for walls)
	1148	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1149
[927]	1150	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1151
[927]	1152	ELSE
[114]	1153	!
[927]	1154	!-- Bottom wall
	1155	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1156	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1157	ENDIF
[114]	1158	!
[927]	1159	!-- South wall
	1160	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1161	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1162	ENDIF
[114]	1163	!
[927]	1164	!-- North wall
	1165	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1166	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1167	ENDIF
[114]	1168	!
[927]	1169	!-- Left wall
	1170	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1171	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1172	ENDIF
[114]	1173	!
[927]	1174	!-- Right wall
	1175	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1176	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1177	ENDIF
	1178
[114]	1179	ENDIF
	1180
[927]	1181	ENDDO
[114]	1182	ENDDO
	1183	ENDDO
	1184
[927]	1185	ENDIF
	1186
[114]	1187	!
	1188	!-- Test output of flag arrays
[145]	1189	! i = nxl_l
	1190	! WRITE (9,*) ' '
	1191	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1192	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1193	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1194	! DO k = nzt_l+1, nzb, -1
	1195	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1196	! ENDDO
[114]	1197
	1198	inc = inc * 2
	1199
	1200	ENDDO
	1201
	1202	ENDIF
[861]	1203	!
	1204	!-- Allocate flags needed for masking walls.
[1677]	1205	ALLOCATE( wall_flags_0(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	1206	wall_flags_00(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
[1221]	1207	wall_flags_0 = 0
	1208	wall_flags_00 = 0
[114]	1209
[1557]	1210	IF ( scalar_advec == 'ws-scheme' .OR. &
	1211	scalar_advec == 'ws-scheme-mono' ) THEN
[114]	1212	!
[861]	1213	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1214	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1215	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1216	!-- grid points.
	1217	DO i = nxl, nxr
	1218	DO j = nys, nyn
	1219	DO k = nzb_s_inner(j,i)+1, nzt
	1220	!
	1221	!-- scalar - x-direction
	1222	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1223	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1224	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1225	.AND. i == nxr ) ) THEN
[861]	1226	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1227	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1228	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1229	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1230	) THEN
[861]	1231	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1232	ELSE
	1233	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1234	ENDIF
	1235	!
	1236	!-- scalar - y-direction
	1237	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1238	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1239	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1240	.AND. j == nyn ) ) THEN
[861]	1241	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1242	!-- WS3
	1243	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1244	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1245	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1246	) THEN
[861]	1247	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1248	!-- WS5
	1249	ELSE
	1250	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1251	ENDIF
	1252	!
	1253	!-- scalar - z-direction
	1254	!-- WS1 (6), WS3 (7), WS5 (8)
	1255	flag_set = .FALSE.
	1256	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1257	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1258	flag_set = .TRUE.
	1259	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1260	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1261	flag_set = .TRUE.
	1262	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1263	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1264	ENDIF
	1265	ENDDO
	1266	ENDDO
	1267	ENDDO
	1268	ENDIF
	1269
	1270	IF ( momentum_advec == 'ws-scheme' ) THEN
	1271	!
	1272	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1273	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1274	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1275	!-- grid points.
	1276	DO i = nxl, nxr
	1277	DO j = nys, nyn
[1580]	1278	DO k = nzb+1, nzt
[861]	1279	!
[1580]	1280	!-- At first, set flags to WS1.
	1281	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1282	!-- in order to handle the left/south flux.
	1283	!-- near vertical walls.
	1284	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1285	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1286	!
[861]	1287	!-- u component - x-direction
	1288	!-- WS1 (9), WS3 (10), WS5 (11)
	1289	IF ( k <= nzb_u_inner(j,i+1) &
[1409]	1290	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i <= nxlu ) &
[978]	1291	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1292	) THEN
[1580]	1293	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
[861]	1294	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1295	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1296	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1297	) THEN
[861]	1298	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
[1580]	1299	!
	1300	!-- Clear flag for WS1
	1301	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1302	ELSE
	1303	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
[1580]	1304	!
	1305	!-- Clear flag for WS1
	1306	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 9 )
[861]	1307	ENDIF
	1308	!
	1309	!-- u component - y-direction
	1310	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1311	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1312	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1313	.AND. j == nyn ) ) THEN
[1580]	1314	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
[861]	1315	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1316	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1317	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1318	) THEN
[861]	1319	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
[1580]	1320	!
	1321	!-- Clear flag for WS1
	1322	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1323	ELSE
	1324	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
[1580]	1325	!
	1326	!-- Clear flag for WS1
	1327	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 12 )
[861]	1328	ENDIF
	1329	!
	1330	!-- u component - z-direction
	1331	!-- WS1 (15), WS3 (16), WS5 (17)
	1332	flag_set = .FALSE.
	1333	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1334	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1335	flag_set = .TRUE.
	1336	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1337	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1338	flag_set = .TRUE.
	1339	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1340	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1341	ENDIF
	1342
	1343	ENDDO
	1344	ENDDO
	1345	ENDDO
	1346
	1347	DO i = nxl, nxr
	1348	DO j = nys, nyn
[1580]	1349	DO k = nzb+1, nzt
[861]	1350	!
[1580]	1351	!-- At first, set flags to WS1.
	1352	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1353	!-- in order to handle the left/south flux.
	1354	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1355	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1356	!
[861]	1357	!-- v component - x-direction
	1358	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1359	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1360	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1361	.AND. i == nxr ) ) THEN
[1580]	1362	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
[861]	1363	!-- WS3
	1364	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1365	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1366	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1367	) THEN
[861]	1368	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
[1580]	1369	!
	1370	!-- Clear flag for WS1
	1371	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1372	ELSE
	1373	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
[1580]	1374	!
	1375	!-- Clear flag for WS1
	1376	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 18 )
[861]	1377	ENDIF
	1378	!
	1379	!-- v component - y-direction
	1380	!-- WS1 (21), WS3 (22), WS5 (23)
	1381	IF ( k <= nzb_v_inner(j+1,i) &
[1409]	1382	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j <= nysv ) &
[978]	1383	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1384	) THEN
[1580]	1385	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
[861]	1386	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1387	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1388	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1389	) THEN
[861]	1390	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
[1580]	1391	!
	1392	!-- Clear flag for WS1
	1393	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1394	ELSE
	1395	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
[1580]	1396	!
	1397	!-- Clear flag for WS1
	1398	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 21 )
[861]	1399	ENDIF
	1400	!
	1401	!-- v component - z-direction
	1402	!-- WS1 (24), WS3 (25), WS5 (26)
	1403	flag_set = .FALSE.
	1404	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1405	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1406	flag_set = .TRUE.
	1407	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1408	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1409	flag_set = .TRUE.
	1410	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1411	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1412	ENDIF
	1413
	1414	ENDDO
	1415	ENDDO
	1416	ENDDO
	1417	DO i = nxl, nxr
	1418	DO j = nys, nyn
[1580]	1419	DO k = nzb+1, nzt
[861]	1420	!
[1580]	1421	!-- At first, set flags to WS1.
	1422	!-- Since fluxes are swapped in advec_ws.f90, this is necessary to
	1423	!-- in order to handle the left/south flux.
	1424	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1425	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1426	!
[861]	1427	!-- w component - x-direction
	1428	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1429	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1430	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1431	.AND. i == nxr ) ) THEN
[1580]	1432	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
[861]	1433	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1434	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1435	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1436	) THEN
[861]	1437	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
[1580]	1438	!
	1439	!-- Clear flag for WS1
	1440	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1441	ELSE
	1442	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
[1580]	1443	!
	1444	!-- Clear flag for WS1
	1445	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 27 )
[861]	1446	ENDIF
	1447	!
	1448	!-- w component - y-direction
	1449	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1450	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1451	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1452	.AND. j == nyn ) ) THEN
[1580]	1453	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
[861]	1454	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1455	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1456	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1457	) THEN
[861]	1458	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
[1580]	1459	!
	1460	!-- Clear flag for WS1
	1461	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1462	ELSE
[1221]	1463	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 0 )
[1580]	1464	!
	1465	!-- Clear flag for WS1
	1466	wall_flags_0(k,j,i) = IBCLR( wall_flags_0(k,j,i), 30 )
[861]	1467	ENDIF
	1468	!
	1469	!-- w component - z-direction
[1679]	1470	!-- WS1 (33), WS3 (34), WS5 (35)
[861]	1471	flag_set = .FALSE.
	1472	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1473	.OR. k == nzt ) THEN
	1474	!
	1475	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1476	!-- set, although this is not a prognostic level. However,
	1477	!-- contrary to the advection of u,v and s this is necessary
	1478	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1479	!-- at k == nzb_w_inner(j,i)+1.
[1221]	1480	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 1 )
[861]	1481	flag_set = .TRUE.
	1482	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
[1221]	1483	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 2 )
[861]	1484	flag_set = .TRUE.
	1485	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
[1221]	1486	wall_flags_00(k,j,i) = IBSET( wall_flags_00(k,j,i), 3 )
[861]	1487	ENDIF
	1488
	1489	ENDDO
	1490	ENDDO
	1491	ENDDO
	1492
	1493	ENDIF
	1494
	1495	!
[1677]	1496	!-- Exchange 3D integer wall_flags.
	1497	IF ( momentum_advec == 'ws-scheme' .OR. scalar_advec == 'ws-scheme' &
	1498	.OR. scalar_advec == 'ws-scheme-mono' ) THEN
	1499	!
	1500	!-- Exchange ghost points for advection flags
	1501	CALL exchange_horiz_int( wall_flags_0, nbgp )
	1502	CALL exchange_horiz_int( wall_flags_00, nbgp )
	1503	!
	1504	!-- Set boundary flags at inflow and outflow boundary in case of
	1505	!-- non-cyclic boundary conditions.
	1506	IF ( inflow_l .OR. outflow_l ) THEN
	1507	wall_flags_0(:,:,nxl-1) = wall_flags_0(:,:,nxl)
	1508	wall_flags_00(:,:,nxl-1) = wall_flags_00(:,:,nxl)
	1509	ENDIF
	1510
	1511	IF ( inflow_r .OR. outflow_r ) THEN
	1512	wall_flags_0(:,:,nxr+1) = wall_flags_0(:,:,nxr)
	1513	wall_flags_00(:,:,nxr+1) = wall_flags_00(:,:,nxr)
	1514	ENDIF
	1515
	1516	IF ( inflow_n .OR. outflow_n ) THEN
	1517	wall_flags_0(:,nyn+1,:) = wall_flags_0(:,nyn,:)
	1518	wall_flags_00(:,nyn+1,:) = wall_flags_00(:,nyn,:)
	1519	ENDIF
	1520
	1521	IF ( inflow_s .OR. outflow_s ) THEN
	1522	wall_flags_0(:,nys-1,:) = wall_flags_0(:,nys,:)
	1523	wall_flags_00(:,nys-1,:) = wall_flags_00(:,nys,:)
	1524	ENDIF
	1525
	1526	ENDIF
	1527
	1528	!
[1]	1529	!-- In case of topography: limit near-wall mixing length l_wall further:
	1530	!-- Go through all points of the subdomain one by one and look for the closest
	1531	!-- surface
	1532	IF ( TRIM(topography) /= 'flat' ) THEN
	1533	DO i = nxl, nxr
	1534	DO j = nys, nyn
	1535
	1536	nzb_si = nzb_s_inner(j,i)
	1537	vi = vertical_influence(nzb_si)
	1538
	1539	IF ( wall_n(j,i) > 0 ) THEN
	1540	!
	1541	!-- North wall (y distance)
	1542	DO k = wall_n(j,i), nzb_si
[1353]	1543	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5_wp * dy )
[1]	1544	ENDDO
	1545	!
	1546	!-- Above North wall (yz distance)
	1547	DO k = nzb_si + 1, nzb_si + vi
[1353]	1548	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1549	SQRT( 0.25_wp * dy**2 + &
[1]	1550	( zu(k) - zw(nzb_si) )**2 ) )
	1551	ENDDO
	1552	!
	1553	!-- Northleft corner (xy distance)
	1554	IF ( corner_nl(j,i) > 0 ) THEN
	1555	DO k = corner_nl(j,i), nzb_si
	1556	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
[1353]	1557	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1558	ENDDO
	1559	!
	1560	!-- Above Northleft corner (xyz distance)
	1561	DO k = nzb_si + 1, nzb_si + vi
[1353]	1562	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1563	SQRT( 0.25_wp * (dx2 + dy2) + &
	1564	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1565	ENDDO
	1566	ENDIF
	1567	!
	1568	!-- Northright corner (xy distance)
	1569	IF ( corner_nr(j,i) > 0 ) THEN
	1570	DO k = corner_nr(j,i), nzb_si
[1353]	1571	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1572	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1573	ENDDO
	1574	!
	1575	!-- Above northright corner (xyz distance)
	1576	DO k = nzb_si + 1, nzb_si + vi
[1353]	1577	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1578	SQRT( 0.25_wp * (dx2 + dy2) + &
	1579	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1580	ENDDO
	1581	ENDIF
	1582	ENDIF
	1583
	1584	IF ( wall_s(j,i) > 0 ) THEN
	1585	!
	1586	!-- South wall (y distance)
	1587	DO k = wall_s(j,i), nzb_si
[1353]	1588	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5_wp * dy )
[1]	1589	ENDDO
	1590	!
	1591	!-- Above south wall (yz distance)
[1353]	1592	DO k = nzb_si + 1, nzb_si + vi
	1593	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1594	SQRT( 0.25_wp * dy**2 + &
[1]	1595	( zu(k) - zw(nzb_si) )**2 ) )
	1596	ENDDO
	1597	!
	1598	!-- Southleft corner (xy distance)
	1599	IF ( corner_sl(j,i) > 0 ) THEN
	1600	DO k = corner_sl(j,i), nzb_si
[1353]	1601	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1602	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1603	ENDDO
	1604	!
	1605	!-- Above southleft corner (xyz distance)
	1606	DO k = nzb_si + 1, nzb_si + vi
[1353]	1607	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1608	SQRT( 0.25_wp * (dx2 + dy2) + &
	1609	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1610	ENDDO
	1611	ENDIF
	1612	!
	1613	!-- Southright corner (xy distance)
	1614	IF ( corner_sr(j,i) > 0 ) THEN
	1615	DO k = corner_sr(j,i), nzb_si
[1353]	1616	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1617	0.5_wp * SQRT( dx2 + dy2 ) )
[1]	1618	ENDDO
	1619	!
	1620	!-- Above southright corner (xyz distance)
	1621	DO k = nzb_si + 1, nzb_si + vi
[1353]	1622	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1623	SQRT( 0.25_wp * (dx2 + dy2) + &
	1624	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1625	ENDDO
	1626	ENDIF
	1627
	1628	ENDIF
	1629
	1630	IF ( wall_l(j,i) > 0 ) THEN
	1631	!
	1632	!-- Left wall (x distance)
	1633	DO k = wall_l(j,i), nzb_si
[1353]	1634	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5_wp * dx )
[1]	1635	ENDDO
	1636	!
	1637	!-- Above left wall (xz distance)
	1638	DO k = nzb_si + 1, nzb_si + vi
[1353]	1639	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1640	SQRT( 0.25_wp * dx**2 + &
	1641	( zu(k) - zw(nzb_si) )**2 ) )
[1]	1642	ENDDO
	1643	ENDIF
	1644
	1645	IF ( wall_r(j,i) > 0 ) THEN
	1646	!
	1647	!-- Right wall (x distance)
	1648	DO k = wall_r(j,i), nzb_si
[1353]	1649	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5_wp * dx )
[1]	1650	ENDDO
	1651	!
	1652	!-- Above right wall (xz distance)
	1653	DO k = nzb_si + 1, nzb_si + vi
[1353]	1654	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1655	SQRT( 0.25_wp * dx**2 + &
[1]	1656	( zu(k) - zw(nzb_si) )**2 ) )
	1657	ENDDO
	1658
	1659	ENDIF
	1660
	1661	ENDDO
	1662	ENDDO
	1663
	1664	ENDIF
	1665
	1666	!
	1667	!-- Multiplication with wall_adjustment_factor
	1668	l_wall = wall_adjustment_factor * l_wall
	1669
	1670	!
[709]	1671	!-- Set lateral boundary conditions for l_wall
[667]	1672	CALL exchange_horiz( l_wall, nbgp )
	1673
[1]	1674	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1675	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1676
[807]	1677	#endif
[1]	1678
	1679	END SUBROUTINE init_grid

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