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source: palm/trunk/SOURCE/init_3d_model.f90 @ 6

Last change on this file since 6 was 4, checked in by raasch, 18 years ago
Id keyword set as property for all *.f90 files
Property svn:keywords set to `Id`
File size: 28.8 KB

Rev	Line
[1]	1	#if defined( __ibmy_special )
	2	@PROCESS NOOPTimize
	3	#endif
	4	SUBROUTINE init_3d_model
	5
	6	!------------------------------------------------------------------------------!
	7	! Actual revisions:
	8	! -----------------
	9	!
	10	!
	11	! Former revisions:
	12	! -----------------
[3]	13	! $Id: init_3d_model.f90 4 2007-02-13 11:33:16Z raasch $
	14	! RCS Log replace by Id keyword, revision history cleaned up
	15	!
[1]	16	! Revision 1.49 2006/08/22 15:59:07 raasch
	17	! No optimization of this file on the ibmy (Yonsei Univ.)
	18	!
	19	! Revision 1.1 1998/03/09 16:22:22 raasch
	20	! Initial revision
	21	!
	22	!
	23	! Description:
	24	! ------------
	25	! Allocation of arrays and initialization of the 3D model via
	26	! a) pre-run the 1D model
	27	! or
	28	! b) pre-set constant linear profiles
	29	! or
	30	! c) read values of a previous run
	31	!------------------------------------------------------------------------------!
	32
	33	USE arrays_3d
	34	USE averaging
	35	USE constants
	36	USE control_parameters
	37	USE cpulog
	38	USE indices
	39	USE interfaces
	40	USE model_1d
	41	USE particle_attributes
	42	USE pegrid
	43	USE profil_parameter
	44	USE random_function_mod
	45	USE statistics
	46
	47	IMPLICIT NONE
	48
	49	INTEGER :: i, j, k, sr
	50
	51	INTEGER, DIMENSION(:), ALLOCATABLE :: ngp_2dh_l, ngp_3d_inner_l
	52
	53	INTEGER, DIMENSION(:,:), ALLOCATABLE :: ngp_2dh_outer_l
	54
	55	REAL, DIMENSION(1:2) :: volume_flow_area_l, volume_flow_initial_l
	56
	57
	58	!
	59	!-- Allocate arrays
	60	ALLOCATE( ngp_2dh(0:statistic_regions), ngp_2dh_l(0:statistic_regions), &
	61	ngp_3d(0:statistic_regions), &
	62	ngp_3d_inner(0:statistic_regions), &
	63	ngp_3d_inner_l(0:statistic_regions), &
	64	sums_divnew_l(0:statistic_regions), &
	65	sums_divold_l(0:statistic_regions) )
	66	ALLOCATE( rdf(nzb+1:nzt), uvmean_outflow(nzb:nzt+1), &
	67	uvmean_outflow_l(nzb:nzt+1) )
	68	ALLOCATE( hom_sum(nzb:nzt+1,var_hom,0:statistic_regions), &
	69	ngp_2dh_outer(nzb:nzt+1,0:statistic_regions), &
	70	ngp_2dh_outer_l(nzb:nzt+1,0:statistic_regions), &
	71	rmask(nys-1:nyn+1,nxl-1:nxr+1,0:statistic_regions), &
	72	sums(nzb:nzt+1,var_sum), &
	73	sums_l(nzb:nzt+1,var_sum,0:threads_per_task-1), &
	74	sums_l_l(nzb:nzt+1,0:statistic_regions,0:threads_per_task-1), &
	75	sums_up_fraction_l(10,3,0:statistic_regions), &
	76	sums_wsts_bc_l(nzb:nzt+1,0:statistic_regions) )
	77	ALLOCATE( km_damp_x(nxl-1:nxr+1), km_damp_y(nys-1:nyn+1) )
	78
	79	ALLOCATE( rif_1(nys-1:nyn+1,nxl-1:nxr+1), shf_1(nys-1:nyn+1,nxl-1:nxr+1), &
	80	ts(nys-1:nyn+1,nxl-1:nxr+1), us(nys-1:nyn+1,nxl-1:nxr+1), &
	81	usws_1(nys-1:nyn+1,nxl-1:nxr+1), vsws_1(nys-1:nyn+1,nxl-1:nxr+1),&
	82	z0(nys-1:nyn+1,nxl-1:nxr+1) )
	83
	84	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
	85	!
	86	!-- Leapfrog scheme needs two timelevels of diffusion quantities
	87	ALLOCATE( rif_2(nys-1:nyn+1,nxl-1:nxr+1), &
	88	shf_2(nys-1:nyn+1,nxl-1:nxr+1), &
	89	usws_2(nys-1:nyn+1,nxl-1:nxr+1), &
	90	vsws_2(nys-1:nyn+1,nxl-1:nxr+1) )
	91	ENDIF
	92
	93	ALLOCATE( d(nzb+1:nzta,nys:nyna,nxl:nxra), &
	94	e_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	95	e_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	96	e_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	97	kh_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	98	km_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	99	p(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	100	pt_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	101	pt_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	102	pt_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	103	tend(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	104	u_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1+uxrp), &
	105	u_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1+uxrp), &
	106	u_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1+uxrp), &
	107	v_1(nzb:nzt+1,nys-1:nyn+1+vynp,nxl-1:nxr+1), &
	108	v_2(nzb:nzt+1,nys-1:nyn+1+vynp,nxl-1:nxr+1), &
	109	v_3(nzb:nzt+1,nys-1:nyn+1+vynp,nxl-1:nxr+1), &
	110	w_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	111	w_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	112	w_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
	113
	114	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
	115	ALLOCATE( kh_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	116	km_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
	117	ENDIF
	118
	119	IF ( moisture .OR. passive_scalar ) THEN
	120	!
	121	!-- 2D-moisture/scalar arrays
	122	ALLOCATE ( qs(nys-1:nyn+1,nxl-1:nxr+1), &
	123	qsws_1(nys-1:nyn+1,nxl-1:nxr+1) )
	124
	125	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
	126	ALLOCATE( qsws_2(nys-1:nyn+1,nxl-1:nxr+1) )
	127	ENDIF
	128	!
	129	!-- 3D-moisture/scalar arrays
	130	ALLOCATE( q_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	131	q_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	132	q_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
	133
	134	!
	135	!-- 3D-arrays needed for moisture only
	136	IF ( moisture ) THEN
	137	ALLOCATE( vpt_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
	138
	139	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
	140	ALLOCATE( vpt_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
	141	ENDIF
	142
	143	IF ( cloud_physics ) THEN
	144	!
	145	!-- Liquid water content
	146	ALLOCATE ( ql_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
	147	ENDIF
	148
	149	IF ( cloud_droplets ) THEN
	150	!
	151	!-- Liquid water content, change in liquid water content,
	152	!-- real volume of particles (with weighting), volume of particles
	153	ALLOCATE ( ql_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	154	ql_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	155	ql_v(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
	156	ql_vp(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
	157	ENDIF
	158
	159	ENDIF
	160
	161	ENDIF
	162
	163	!
	164	!-- 3D-array for storing the dissipation, needed for calculating the sgs
	165	!-- particle velocities
	166	IF ( use_sgs_for_particles ) THEN
	167	ALLOCATE ( diss(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
	168	ENDIF
	169
	170	IF ( dt_dosp /= 9999999.9 ) THEN
	171	ALLOCATE( spectrum_x( 1:nx/2, 1:10, 1:10 ), &
	172	spectrum_y( 1:ny/2, 1:10, 1:10 ) )
	173	ENDIF
	174
	175	!
	176	!-- Initial assignment of the pointers
	177	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
	178
	179	rif_m => rif_1; rif => rif_2
	180	shf_m => shf_1; shf => shf_2
	181	usws_m => usws_1; usws => usws_2
	182	vsws_m => vsws_1; vsws => vsws_2
	183	e_m => e_1; e => e_2; e_p => e_3; te_m => e_3
	184	kh_m => kh_1; kh => kh_2
	185	km_m => km_1; km => km_2
	186	pt_m => pt_1; pt => pt_2; pt_p => pt_3; tpt_m => pt_3
	187	u_m => u_1; u => u_2; u_p => u_3; tu_m => u_3
	188	v_m => v_1; v => v_2; v_p => v_3; tv_m => v_3
	189	w_m => w_1; w => w_2; w_p => w_3; tw_m => w_3
	190
	191	IF ( moisture .OR. passive_scalar ) THEN
	192	qsws_m => qsws_1; qsws => qsws_2
	193	q_m => q_1; q => q_2; q_p => q_3; tq_m => q_3
	194	IF ( moisture ) vpt_m => vpt_1; vpt => vpt_2
	195	IF ( cloud_physics ) ql => ql_1
	196	IF ( cloud_droplets ) THEN
	197	ql => ql_1
	198	ql_c => ql_2
	199	ENDIF
	200	ENDIF
	201
	202	ELSE
	203
	204	rif => rif_1
	205	shf => shf_1
	206	usws => usws_1
	207	vsws => vsws_1
	208	e => e_1; e_p => e_2; te_m => e_3; e_m => e_3
	209	kh => kh_1
	210	km => km_1
	211	pt => pt_1; pt_p => pt_2; tpt_m => pt_3; pt_m => pt_3
	212	u => u_1; u_p => u_2; tu_m => u_3; u_m => u_3
	213	v => v_1; v_p => v_2; tv_m => v_3; v_m => v_3
	214	w => w_1; w_p => w_2; tw_m => w_3; w_m => w_3
	215
	216	IF ( moisture .OR. passive_scalar ) THEN
	217	qsws => qsws_1
	218	q => q_1; q_p => q_2; tq_m => q_3; q_m => q_3
	219	IF ( moisture ) vpt => vpt_1
	220	IF ( cloud_physics ) ql => ql_1
	221	IF ( cloud_droplets ) THEN
	222	ql => ql_1
	223	ql_c => ql_2
	224	ENDIF
	225	ENDIF
	226
	227	ENDIF
	228
	229	!
	230	!-- Initialize model variables
	231	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
	232	!
	233	!-- First model run of a possible job queue.
	234	!-- Initial profiles of the variables must be computes.
	235	IF ( INDEX( initializing_actions, 'set_1d-model_profiles' ) /= 0 ) THEN
	236	!
	237	!-- Use solutions of the 1D model as initial profiles,
	238	!-- start 1D model
	239	CALL init_1d_model
	240	!
	241	!-- Transfer initial profiles to the arrays of the 3D model
	242	DO i = nxl-1, nxr+1
	243	DO j = nys-1, nyn+1
	244	e(:,j,i) = e1d
	245	kh(:,j,i) = kh1d
	246	km(:,j,i) = km1d
	247	pt(:,j,i) = pt_init
	248	ENDDO
	249	ENDDO
	250	DO i = nxl-1, nxr+uxrp+1
	251	DO j = nys-1, nyn+1
	252	u(:,j,i) = u1d
	253	ENDDO
	254	ENDDO
	255	DO i = nxl-1, nxr+1
	256	DO j = nys-1, nyn+vynp+1
	257	v(:,j,i) = v1d
	258	ENDDO
	259	ENDDO
	260
	261	IF ( moisture .OR. passive_scalar ) THEN
	262	DO i = nxl-1, nxr+1
	263	DO j = nys-1, nyn+1
	264	q(:,j,i) = q_init
	265	ENDDO
	266	ENDDO
	267	ENDIF
	268
	269	IF ( .NOT. constant_diffusion ) THEN
	270	DO i = nxl-1, nxr+1
	271	DO j = nys-1, nyn+1
	272	e(:,j,i) = e1d
	273	ENDDO
	274	ENDDO
	275	!
	276	!-- Store initial profiles for output purposes etc.
	277	hom(:,1,25,:) = SPREAD( l1d, 2, statistic_regions+1 )
	278
	279	IF ( prandtl_layer ) THEN
	280	rif = rif1d(nzb+1)
	281	ts = 0.0 ! could actually be computed more accurately in the
	282	! 1D model. Update when opportunity arises.
	283	us = us1d
	284	usws = usws1d
	285	vsws = vsws1d
	286	ELSE
	287	ts = 0.0 ! must be set, because used in
	288	rif = 0.0 ! flowste
	289	us = 0.0
	290	usws = 0.0
	291	vsws = 0.0
	292	ENDIF
	293
	294	ELSE
	295	e = 0.0 ! must be set, because used in
	296	rif = 0.0 ! flowste
	297	ts = 0.0
	298	us = 0.0
	299	usws = 0.0
	300	vsws = 0.0
	301	ENDIF
	302
	303	!
	304	!-- In every case qs = 0.0 (see also pt)
	305	!-- This could actually be computed more accurately in the 1D model.
	306	!-- Update when opportunity arises!
	307	IF ( moisture .OR. passive_scalar ) qs = 0.0
	308
	309	!
	310	!-- inside buildings set velocities back to zero
	311	IF ( topography /= 'flat' ) THEN
	312	DO i = nxl-1, nxr+1
	313	DO j = nys-1, nyn+1
	314	u(nzb:nzb_u_inner(j,i),j,i) = 0.0
	315	v(nzb:nzb_v_inner(j,i),j,i) = 0.0
	316	ENDDO
	317	ENDDO
	318	!
	319	!-- WARNING: The extra boundary conditions set after running the
	320	!-- ------- 1D model impose an error on the divergence one layer
	321	!-- below the topography; need to correct later
	322	!-- ATTENTION: Provisional correction for Piacsek & Williams
	323	!-- --------- advection scheme: keep u and v zero one layer below
	324	!-- the topography.
	325	IF ( ibc_uv_b == 0 ) THEN
	326	!
	327	!-- Satisfying the Dirichlet condition with an extra layer below
	328	!-- the surface where the u and v component change their sign.
	329	DO i = nxl-1, nxr+1
	330	DO j = nys-1, nyn+1
	331	IF ( nzb_u_inner(j,i) == 0 ) u(0,j,i) = -u(1,j,i)
	332	IF ( nzb_v_inner(j,i) == 0 ) v(0,j,i) = -v(1,j,i)
	333	ENDDO
	334	ENDDO
	335
	336	ELSE
	337	!
	338	!-- Neumann condition
	339	DO i = nxl-1, nxr+1
	340	DO j = nys-1, nyn+1
	341	IF ( nzb_u_inner(j,i) == 0 ) u(0,j,i) = u(1,j,i)
	342	IF ( nzb_v_inner(j,i) == 0 ) v(0,j,i) = v(1,j,i)
	343	ENDDO
	344	ENDDO
	345
	346	ENDIF
	347
	348	ENDIF
	349
	350	ELSEIF ( INDEX(initializing_actions, 'set_constant_profiles') /= 0 ) &
	351	THEN
	352	!
	353	!-- Use constructed initial profiles (velocity constant with height,
	354	!-- temperature profile with constant gradient)
	355	DO i = nxl-1, nxr+1
	356	DO j = nys-1, nyn+1
	357	pt(:,j,i) = pt_init
	358	ENDDO
	359	ENDDO
	360	DO i = nxl-1, nxr+uxrp+1
	361	DO j = nys-1, nyn+1
	362	u(:,j,i) = u_init
	363	ENDDO
	364	ENDDO
	365	DO i = nxl-1, nxr+1
	366	DO j = nys-1, nyn+vynp+1
	367	v(:,j,i) = v_init
	368	ENDDO
	369	ENDDO
	370	!
	371	!-- Set initial horizontal velocities at the lowest grid levels to zero
	372	!-- in order to avoid too small time steps caused by the diffusion
	373	!-- limit in the initial phase of a run (at k=1, dz/2 occurs in the
	374	!-- limiting formula!)
	375	DO i = nxl-1, nxr+1
	376	DO j = nys-1, nyn+1
	377	u(nzb:nzb_u_inner(j,i)+1,j,i) = 0.0
	378	v(nzb:nzb_v_inner(j,i)+1,j,i) = 0.0
	379	ENDDO
	380	ENDDO
	381
	382	IF ( moisture .OR. passive_scalar ) THEN
	383	DO i = nxl-1, nxr+1
	384	DO j = nys-1, nyn+1
	385	q(:,j,i) = q_init
	386	ENDDO
	387	ENDDO
	388	ENDIF
	389
	390
	391	IF ( constant_diffusion ) THEN
	392	km = km_constant
	393	kh = km / prandtl_number
	394	ELSE
	395	kh = 0.01 ! there must exist an initial diffusion, because
	396	km = 0.01 ! otherwise no TKE would be produced by the
	397	! production terms, as long as not yet
	398	! e = (u/cm)*2 at k=nzb+1
	399	ENDIF
	400	e = 0.0
	401	rif = 0.0
	402	ts = 0.0
	403	us = 0.0
	404	usws = 0.0
	405	vsws = 0.0
	406	IF ( moisture .OR. passive_scalar ) qs = 0.0
	407
	408	!
	409	!-- Compute initial temperature field and other constants used in case
	410	!-- of a sloping surface
	411	IF ( sloping_surface ) CALL init_slope
	412
	413	ENDIF
	414
	415	!
	416	!-- Calculate virtual potential temperature
	417	IF ( moisture ) vpt = pt * ( 1.0 + 0.61 * q )
	418
	419	!
	420	!-- Store initial profiles for output purposes etc.
	421	hom(:,1,5,:) = SPREAD( u(:,nys,nxl), 2, statistic_regions+1 )
	422	hom(:,1,6,:) = SPREAD( v(:,nys,nxl), 2, statistic_regions+1 )
	423	IF ( ibc_uv_b == 0 ) THEN
	424	hom(nzb,1,5,:) = -hom(nzb+1,1,5,:) ! due to satisfying the Dirichlet
	425	hom(nzb,1,6,:) = -hom(nzb+1,1,6,:) ! condition with an extra layer
	426	! below the surface where the u and v component change their sign
	427	ENDIF
	428	hom(:,1,7,:) = SPREAD( pt(:,nys,nxl), 2, statistic_regions+1 )
	429	hom(:,1,23,:) = SPREAD( km(:,nys,nxl), 2, statistic_regions+1 )
	430	hom(:,1,24,:) = SPREAD( kh(:,nys,nxl), 2, statistic_regions+1 )
	431
	432
	433	IF ( moisture ) THEN
	434	!
	435	!-- Store initial profile of total water content, virtual potential
	436	!-- temperature
	437	hom(:,1,26,:) = SPREAD( q(:,nys,nxl), 2, statistic_regions+1 )
	438	hom(:,1,29,:) = SPREAD( vpt(:,nys,nxl), 2, statistic_regions+1 )
	439	IF ( cloud_physics .OR. cloud_droplets ) THEN
	440	!
	441	!-- Store initial profile of specific humidity and potential
	442	!-- temperature
	443	hom(:,1,27,:) = SPREAD( q(:,nys,nxl), 2, statistic_regions+1 )
	444	hom(:,1,28,:) = SPREAD( pt(:,nys,nxl), 2, statistic_regions+1 )
	445	ENDIF
	446	ENDIF
	447
	448	IF ( passive_scalar ) THEN
	449	!
	450	!-- Store initial scalar profile
	451	hom(:,1,26,:) = SPREAD( q(:,nys,nxl), 2, statistic_regions+1 )
	452	ENDIF
	453
	454	!
	455	!-- Initialize surface fluxes
	456	IF ( use_surface_fluxes ) THEN
	457
	458	IF ( constant_heatflux ) THEN
	459	!
	460	!-- Heat flux is prescribed
	461	IF ( random_heatflux ) THEN
	462	CALL disturb_heatflux
	463	ELSE
	464	shf = surface_heatflux
	465	!
	466	!-- Over topography surface_heatflux is replaced by wall_heatflux(0)
	467	IF ( TRIM( topography ) /= 'flat' ) THEN
	468	DO i = nxl-1, nxr+1
	469	DO j = nys-1, nyn+1
	470	IF ( nzb_s_inner(j,i) /= 0 ) THEN
	471	shf(j,i) = wall_heatflux(0)
	472	ENDIF
	473	ENDDO
	474	ENDDO
	475	ENDIF
	476	ENDIF
	477	IF ( ASSOCIATED( shf_m ) ) shf_m = shf
	478	ENDIF
	479
	480	!
	481	!-- Determine the near-surface water flux
	482	IF ( moisture .OR. passive_scalar ) THEN
	483	IF ( constant_waterflux ) THEN
	484	qsws = surface_waterflux
	485	IF ( ASSOCIATED( qsws_m ) ) qsws_m = qsws
	486	ENDIF
	487	ENDIF
	488
	489	ENDIF
	490
	491	!
	492	!-- Initialize Prandtl layer quantities
	493	IF ( prandtl_layer ) THEN
	494
	495	z0 = roughness_length
	496
	497	IF ( .NOT. constant_heatflux ) THEN
	498	!
	499	!-- Surface temperature is prescribed. Here the heat flux cannot be
	500	!-- simply estimated, because therefore rif, u* and theta* would have
	501	!-- to be computed by iteration. This is why the heat flux is assumed
	502	!-- to be zero before the first time step. It approaches its correct
	503	!-- value in the course of the first few time steps.
	504	shf = 0.0
	505	IF ( ASSOCIATED( shf_m ) ) shf_m = 0.0
	506	ENDIF
	507
	508	IF ( moisture .OR. passive_scalar ) THEN
	509	IF ( .NOT. constant_waterflux ) THEN
	510	qsws = 0.0
	511	IF ( ASSOCIATED( qsws_m ) ) qsws_m = 0.0
	512	ENDIF
	513	ENDIF
	514
	515	ENDIF
	516
	517	!
	518	!-- Calculate the initial volume flow at the right and north boundary
	519	IF ( conserve_volume_flow ) THEN
	520
	521	volume_flow_initial_l = 0.0
	522	volume_flow_area_l = 0.0
	523
	524	IF ( nxr == nx ) THEN
	525	DO j = nys, nyn
	526	DO k = nzb_2d(j,nx) + 1, nzt
	527	volume_flow_initial_l(1) = volume_flow_initial_l(1) + &
	528	u(k,j,nx) * dzu(k)
	529	volume_flow_area_l(1) = volume_flow_area_l(1) + dzu(k)
	530	ENDDO
	531	ENDDO
	532	ENDIF
	533
	534	IF ( nyn == ny ) THEN
	535	DO i = nxl, nxr
	536	DO k = nzb_2d(ny,i) + 1, nzt
	537	volume_flow_initial_l(2) = volume_flow_initial_l(2) + &
	538	v(k,ny,i) * dzu(k)
	539	volume_flow_area_l(2) = volume_flow_area_l(2) + dzu(k)
	540	ENDDO
	541	ENDDO
	542	ENDIF
	543
	544	#if defined( __parallel )
	545	CALL MPI_ALLREDUCE( volume_flow_initial_l(1), volume_flow_initial(1),&
	546	2, MPI_REAL, MPI_SUM, comm2d, ierr )
	547	CALL MPI_ALLREDUCE( volume_flow_area_l(1), volume_flow_area(1), &
	548	2, MPI_REAL, MPI_SUM, comm2d, ierr )
	549	#else
	550	volume_flow_initial = volume_flow_initial_l
	551	volume_flow_area = volume_flow_area_l
	552	#endif
	553	ENDIF
	554
	555	!
	556	!-- For the moment, perturbation pressure and vertical velocity are zero
	557	p = 0.0; w = 0.0
	558
	559	!
	560	!-- Initialize array sums (must be defined in first call of pres)
	561	sums = 0.0
	562
	563	!
	564	!-- Treating cloud physics, liquid water content is zero at beginning of
	565	!-- the simulation
	566	IF ( cloud_physics ) ql = 0.0
	567
	568	!
	569	!-- Initialize spectra
	570	IF ( dt_dosp /= 9999999.9 ) THEN
	571	spectrum_x = 0.0
	572	spectrum_y = 0.0
	573	ENDIF
	574
	575	!
	576	!-- Impose vortex with vertical axis on the initial velocity profile
	577	IF ( INDEX( initializing_actions, 'initialize_vortex' ) /= 0 ) THEN
	578	CALL init_rankine
	579	ENDIF
	580
	581	!
	582	!-- Impose temperature anomaly (advection test only)
	583	IF ( INDEX( initializing_actions, 'initialize_ptanom' ) /= 0 ) THEN
	584	CALL init_pt_anomaly
	585	ENDIF
	586
	587	!
	588	!-- If required, change the surface temperature at the start of the 3D run
	589	IF ( pt_surface_initial_change /= 0.0 ) THEN
	590	pt(nzb,:,:) = pt(nzb,:,:) + pt_surface_initial_change
	591	ENDIF
	592
	593	!
	594	!-- If required, change the surface humidity/scalar at the start of the 3D
	595	!-- run
	596	IF ( ( moisture .OR. passive_scalar ) .AND. &
	597	q_surface_initial_change /= 0.0 ) THEN
	598	q(nzb,:,:) = q(nzb,:,:) + q_surface_initial_change
	599	ENDIF
	600
	601	!
	602	!-- Initialize the random number generator (from numerical recipes)
	603	CALL random_function_ini
	604
	605	!
	606	!-- Impose random perturbation on the horizontal velocity field and then
	607	!-- remove the divergences from the velocity field
	608	IF ( create_disturbances ) THEN
	609	CALL disturb_field( nzb_u_inner, tend, u, uxrp, 0 )
	610	CALL disturb_field( nzb_v_inner, tend, v, 0, vynp )
	611	n_sor = nsor_ini
	612	CALL pres
	613	n_sor = nsor
	614	ENDIF
	615
	616	!
	617	!-- Once again set the perturbation pressure explicitly to zero in order to
	618	!-- assure that it does not generate any divergences in the first time step.
	619	!-- At t=0 the velocity field is free of divergence (as constructed above).
	620	!-- Divergences being created during a time step are not yet known and thus
	621	!-- cannot be corrected during the time step yet.
	622	p = 0.0
	623
	624	!
	625	!-- Initialize old and new time levels.
	626	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
	627	e_m = e; pt_m = pt; u_m = u; v_m = v; w_m = w; kh_m = kh; km_m = km
	628	ELSE
	629	te_m = 0.0; tpt_m = 0.0; tu_m = 0.0; tv_m = 0.0; tw_m = 0.0
	630	ENDIF
	631	e_p = e; pt_p = pt; u_p = u; v_p = v; w_p = w
	632
	633	IF ( moisture .OR. passive_scalar ) THEN
	634	IF ( ASSOCIATED( q_m ) ) q_m = q
	635	IF ( timestep_scheme(1:5) == 'runge' ) tq_m = 0.0
	636	q_p = q
	637	IF ( moisture .AND. ASSOCIATED( vpt_m ) ) vpt_m = vpt
	638	ENDIF
	639
	640	ELSEIF ( TRIM( initializing_actions ) == 'read_restart_data' ) &
	641	THEN
	642	!
	643	!-- Read binary data from restart file
	644	CALL read_3d_binary
	645
	646	!
	647	!-- Calculate initial temperature field and other constants used in case
	648	!-- of a sloping surface
	649	IF ( sloping_surface ) CALL init_slope
	650
	651	!
	652	!-- Initialize new time levels (only done in order to set boundary values
	653	!-- including ghost points)
	654	e_p = e; pt_p = pt; u_p = u; v_p = v; w_p = w
	655	IF ( moisture .OR. passive_scalar ) q_p = q
	656
	657	ELSE
	658	!
	659	!-- Actually this part of the programm should not be reached
	660	IF ( myid == 0 ) PRINT*,'+++ init_3d_model: unknown initializing ', &
	661	'problem'
	662	CALL local_stop
	663	ENDIF
	664
	665	!
	666	!-- If required, initialize dvrp-software
	667	! WRITE ( 9, * ) '*** myid=', myid, ' vor init_dvrp'
	668	! CALL FLUSH_( 9 )
	669	IF ( dt_dvrp /= 9999999.9 ) CALL init_dvrp
	670	! WRITE ( 9, * ) '*** myid=', myid, ' nach init_dvrp'
	671	! CALL FLUSH_( 9 )
	672
	673	!
	674	!-- If required, initialize quantities for handling cloud physics
	675	!-- This routine must be called before init_particles, because
	676	!-- otherwise, array pt_d_t, needed in data_output_dvrp (called by
	677	!-- init_particles) is not defined.
	678	CALL init_cloud_physics
	679
	680	!
	681	!-- If required, initialize particles
	682	! WRITE ( 9, * ) '*** myid=', myid, ' vor init_particles'
	683	! CALL FLUSH_( 9 )
	684	CALL init_particles
	685	! WRITE ( 9, * ) '*** myid=', myid, ' nach init_particles'
	686	! CALL FLUSH_( 9 )
	687
	688	!
	689	!-- Initialize quantities for special advections schemes
	690	CALL init_advec
	691
	692	!
	693	!-- Initialize Rayleigh damping factors
	694	rdf = 0.0
	695	IF ( rayleigh_damping_factor /= 0.0 ) THEN
	696	DO k = nzb+1, nzt
	697	IF ( zu(k) >= rayleigh_damping_height ) THEN
	698	rdf(k) = rayleigh_damping_factor * &
	699	( SIN( pi * 0.5 * ( zu(k) - rayleigh_damping_height ) &
	700	/ ( zu(nzt) - rayleigh_damping_height ) )&
	701	)**2
	702	ENDIF
	703	ENDDO
	704	ENDIF
	705
	706	!
	707	!-- Initialize diffusivities used within the outflow damping layer in case of
	708	!-- non-cyclic lateral boundaries. A linear increase is assumed over the first
	709	!-- half of the width of the damping layer
	710	IF ( bc_lr /= 'cyclic' ) THEN
	711
	712	DO i = nxl-1, nxr+1
	713
	714	IF ( outflow_r ) THEN
	715
	716	IF ( i >= nx - outflow_damping_width ) THEN
	717	km_damp_x(i) = km_damp_max * MIN( 1.0, &
	718	( i - ( nx - outflow_damping_width ) ) / &
	719	REAL( outflow_damping_width/2 ) &
	720	)
	721	ELSE
	722	km_damp_x(i) = 0.0
	723	ENDIF
	724
	725	ELSEIF ( outflow_l ) THEN
	726
	727	IF ( i <= outflow_damping_width ) THEN
	728	km_damp_x(i) = km_damp_max * MIN( 1.0, &
	729	( outflow_damping_width - i ) / &
	730	REAL( outflow_damping_width/2 ) &
	731	)
	732	ELSE
	733	km_damp_x(i) = 0.0
	734	ENDIF
	735
	736	ENDIF
	737
	738	ENDDO
	739	ENDIF
	740
	741	IF ( bc_ns /= 'cyclic' ) THEN
	742
	743	DO j = nys-1, nyn+1
	744
	745	IF ( outflow_n ) THEN
	746
	747	IF ( j >= ny - outflow_damping_width ) THEN
	748	km_damp_y(j) = km_damp_max * MIN( 1.0, &
	749	( j - ( ny - outflow_damping_width ) ) / &
	750	REAL( outflow_damping_width/2 ) &
	751	)
	752	ELSE
	753	km_damp_y(j) = 0.0
	754	ENDIF
	755
	756	ELSEIF ( outflow_s ) THEN
	757
	758	IF ( j <= outflow_damping_width ) THEN
	759	km_damp_y(j) = km_damp_max * MIN( 1.0, &
	760	( outflow_damping_width - j ) / &
	761	REAL( outflow_damping_width/2 ) &
	762	)
	763	ELSE
	764	km_damp_y(j) = 0.0
	765	ENDIF
	766
	767	ENDIF
	768
	769	ENDDO
	770	ENDIF
	771
	772	!
	773	!-- Initialize local summation arrays for UP flow_statistics. This is necessary
	774	!-- because they may not yet have been initialized when they are called from
	775	!-- flow_statistics (or - depending on the chosen model run - are never
	776	!-- initialized)
	777	sums_divnew_l = 0.0
	778	sums_divold_l = 0.0
	779	sums_l_l = 0.0
	780	sums_up_fraction_l = 0.0
	781	sums_wsts_bc_l = 0.0
	782
	783	!
	784	!-- Pre-set masks for regional statistics. Default is the total model domain.
	785	rmask = 1.0
	786
	787	!
	788	!-- User-defined initializing actions
	789	CALL user_init
	790
	791	!
	792	!-- Input binary data file is not needed anymore. This line must be placed
	793	!-- after call of user_init!
	794	CALL close_file( 13 )
	795
	796	!
	797	!-- Compute total sum of active mask grid points
	798	!-- ngp_2dh: number of grid points of a horizontal cross section through the
	799	!-- total domain
	800	!-- ngp_3d: number of grid points of the total domain
	801	!-- Note: The lower vertical index nzb_s_outer imposes a small error on the 2D
	802	!-- ---- averages of staggered variables such as u and v due to the topography
	803	!-- arrangement on the staggered grid. Maybe revise later.
	804	ngp_2dh_outer_l = 0
	805	ngp_2dh_outer = 0
	806	ngp_2dh_l = 0
	807	ngp_2dh = 0
	808	ngp_3d_inner_l = 0
	809	ngp_3d_inner = 0
	810	ngp_3d = 0
	811	ngp_sums = ( nz + 2 ) * var_sum
	812
	813	DO sr = 0, statistic_regions
	814	DO i = nxl, nxr
	815	DO j = nys, nyn
	816	IF ( rmask(j,i,sr) == 1.0 ) THEN
	817	!
	818	!-- All xy-grid points
	819	ngp_2dh_l(sr) = ngp_2dh_l(sr) + 1
	820	!
	821	!-- xy-grid points above topography
	822	DO k = nzb_s_outer(j,i), nz + 1
	823	ngp_2dh_outer_l(k,sr) = ngp_2dh_outer_l(k,sr) + 1
	824	ENDDO
	825	!
	826	!-- All grid points of the total domain above topography
	827	ngp_3d_inner_l(sr) = ngp_3d_inner_l(sr) + &
	828	( nz - nzb_s_inner(j,i) + 2 )
	829	ENDIF
	830	ENDDO
	831	ENDDO
	832	ENDDO
	833
	834	sr = statistic_regions + 1
	835	#if defined( __parallel )
	836	CALL MPI_ALLREDUCE( ngp_2dh_l(0), ngp_2dh(0), sr, MPI_INTEGER, MPI_SUM, &
	837	comm2d, ierr )
	838	CALL MPI_ALLREDUCE( ngp_2dh_outer_l(0,0), ngp_2dh_outer(0,0), (nz+2)*sr, &
	839	MPI_INTEGER, MPI_SUM, comm2d, ierr )
	840	CALL MPI_ALLREDUCE( ngp_3d_inner_l(0), ngp_3d_inner(0), sr, MPI_INTEGER, &
	841	MPI_SUM, comm2d, ierr )
	842	#else
	843	ngp_2dh = ngp_2dh_l
	844	ngp_2dh_outer = ngp_2dh_outer_l
	845	ngp_3d_inner = ngp_3d_inner_l
	846	#endif
	847
	848	ngp_3d = ngp_2dh * ( nz + 2 )
	849
	850	!
	851	!-- Set a lower limit of 1 in order to avoid zero divisions in flow_statistics,
	852	!-- buoyancy, etc. A zero value will occur for cases where all grid points of
	853	!-- the respective subdomain lie below the surface topography
	854	ngp_2dh_outer = MAX( 1, ngp_2dh_outer(:,:) )
	855	ngp_3d_inner = MAX( 1, ngp_3d_inner(:) )
	856
	857	DEALLOCATE( ngp_2dh_l, ngp_2dh_outer_l, ngp_3d_inner_l )
	858
	859
	860	END SUBROUTINE init_3d_model

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