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source: palm/trunk/SOURCE/init_3d_model.f90 @ 75

Last change on this file since 75 was 75, checked in by raasch, 18 years ago
preliminary update for changes concerning non-cyclic boundary conditions
Property svn:keywords set to `Id`
File size: 33.4 KB

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1	#if defined( __ibmy_special )
2	@PROCESS NOOPTimize
3	#endif
4	SUBROUTINE init_3d_model
5
6	!------------------------------------------------------------------------------!
7	! Actual revisions:
8	! -----------------
9	! Arrays for radiation boundary conditions are allocated (u_m_l, u_m_r, etc.),
10	! bugfix for cases with the outflow damping layer extending over more than one
11	! subdomain, moisture renamed humidity,
12	! new initializing action "by_user" calls user_init_3d_model,
13	! precipitation_amount/rate, ts_value are allocated, +module netcdf_control,
14	! initial velocities at nzb+1 are regarded for volume
15	! flow control in case they have been set zero before (to avoid small timesteps)
16	! -uvmean_outflow, uxrp, vynp eliminated
17	!
18	! Former revisions:
19	! -----------------
20	! $Id: init_3d_model.f90 75 2007-03-22 09:54:05Z raasch $
21	!
22	! 19 2007-02-23 04:53:48Z raasch
23	! +handling of top fluxes
24	!
25	! RCS Log replace by Id keyword, revision history cleaned up
26	!
27	! Revision 1.49 2006/08/22 15:59:07 raasch
28	! No optimization of this file on the ibmy (Yonsei Univ.)
29	!
30	! Revision 1.1 1998/03/09 16:22:22 raasch
31	! Initial revision
32	!
33	!
34	! Description:
35	! ------------
36	! Allocation of arrays and initialization of the 3D model via
37	! a) pre-run the 1D model
38	! or
39	! b) pre-set constant linear profiles
40	! or
41	! c) read values of a previous run
42	!------------------------------------------------------------------------------!
43
44	USE arrays_3d
45	USE averaging
46	USE cloud_parameters
47	USE constants
48	USE control_parameters
49	USE cpulog
50	USE indices
51	USE interfaces
52	USE model_1d
53	USE netcdf_control
54	USE particle_attributes
55	USE pegrid
56	USE profil_parameter
57	USE random_function_mod
58	USE statistics
59
60	IMPLICIT NONE
61
62	INTEGER :: i, j, k, sr
63
64	INTEGER, DIMENSION(:), ALLOCATABLE :: ngp_2dh_l, ngp_3d_inner_l
65
66	INTEGER, DIMENSION(:,:), ALLOCATABLE :: ngp_2dh_outer_l
67
68	REAL, DIMENSION(1:2) :: volume_flow_area_l, volume_flow_initial_l
69
70
71	!
72	!-- Allocate arrays
73	ALLOCATE( ngp_2dh(0:statistic_regions), ngp_2dh_l(0:statistic_regions), &
74	ngp_3d(0:statistic_regions), &
75	ngp_3d_inner(0:statistic_regions), &
76	ngp_3d_inner_l(0:statistic_regions), &
77	sums_divnew_l(0:statistic_regions), &
78	sums_divold_l(0:statistic_regions) )
79	ALLOCATE( rdf(nzb+1:nzt) )
80	ALLOCATE( hom_sum(nzb:nzt+1,var_hom,0:statistic_regions), &
81	ngp_2dh_outer(nzb:nzt+1,0:statistic_regions), &
82	ngp_2dh_outer_l(nzb:nzt+1,0:statistic_regions), &
83	rmask(nys-1:nyn+1,nxl-1:nxr+1,0:statistic_regions), &
84	sums(nzb:nzt+1,var_sum), &
85	sums_l(nzb:nzt+1,var_sum,0:threads_per_task-1), &
86	sums_l_l(nzb:nzt+1,0:statistic_regions,0:threads_per_task-1), &
87	sums_up_fraction_l(10,3,0:statistic_regions), &
88	sums_wsts_bc_l(nzb:nzt+1,0:statistic_regions), &
89	ts_value(var_ts,0:statistic_regions) )
90	ALLOCATE( km_damp_x(nxl-1:nxr+1), km_damp_y(nys-1:nyn+1) )
91
92	ALLOCATE( rif_1(nys-1:nyn+1,nxl-1:nxr+1), shf_1(nys-1:nyn+1,nxl-1:nxr+1), &
93	ts(nys-1:nyn+1,nxl-1:nxr+1), tswst_1(nys-1:nyn+1,nxl-1:nxr+1), &
94	us(nys-1:nyn+1,nxl-1:nxr+1), usws_1(nys-1:nyn+1,nxl-1:nxr+1), &
95	vsws_1(nys-1:nyn+1,nxl-1:nxr+1), z0(nys-1:nyn+1,nxl-1:nxr+1) )
96
97	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
98	!
99	!-- Leapfrog scheme needs two timelevels of diffusion quantities
100	ALLOCATE( rif_2(nys-1:nyn+1,nxl-1:nxr+1), &
101	shf_2(nys-1:nyn+1,nxl-1:nxr+1), &
102	tswst_2(nys-1:nyn+1,nxl-1:nxr+1), &
103	usws_2(nys-1:nyn+1,nxl-1:nxr+1), &
104	vsws_2(nys-1:nyn+1,nxl-1:nxr+1) )
105	ENDIF
106
107	ALLOCATE( d(nzb+1:nzta,nys:nyna,nxl:nxra), &
108	e_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
109	e_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
110	e_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
111	kh_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
112	km_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
113	p(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
114	pt_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
115	pt_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
116	pt_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
117	tend(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
118	u_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
119	u_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
120	u_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
121	v_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
122	v_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
123	v_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
124	w_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
125	w_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
126	w_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
127
128	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
129	ALLOCATE( kh_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
130	km_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
131	ENDIF
132
133	IF ( humidity .OR. passive_scalar ) THEN
134	!
135	!-- 2D-humidity/scalar arrays
136	ALLOCATE ( qs(nys-1:nyn+1,nxl-1:nxr+1), &
137	qsws_1(nys-1:nyn+1,nxl-1:nxr+1), &
138	qswst_1(nys-1:nyn+1,nxl-1:nxr+1) )
139
140	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
141	ALLOCATE( qsws_2(nys-1:nyn+1,nxl-1:nxr+1), &
142	qswst_2(nys-1:nyn+1,nxl-1:nxr+1) )
143	ENDIF
144	!
145	!-- 3D-humidity/scalar arrays
146	ALLOCATE( q_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
147	q_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
148	q_3(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
149
150	!
151	!-- 3D-arrays needed for humidity only
152	IF ( humidity ) THEN
153	ALLOCATE( vpt_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
154
155	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
156	ALLOCATE( vpt_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
157	ENDIF
158
159	IF ( cloud_physics ) THEN
160	!
161	!-- Liquid water content
162	ALLOCATE ( ql_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
163	!
164	!-- Precipitation amount and rate (only needed if output is switched)
165	ALLOCATE( precipitation_amount(nys-1:nyn+1,nxl-1:nxr+1), &
166	precipitation_rate(nys-1:nyn+1,nxl-1:nxr+1) )
167	ENDIF
168
169	IF ( cloud_droplets ) THEN
170	!
171	!-- Liquid water content, change in liquid water content,
172	!-- real volume of particles (with weighting), volume of particles
173	ALLOCATE ( ql_1(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
174	ql_2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
175	ql_v(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1), &
176	ql_vp(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
177	ENDIF
178
179	ENDIF
180
181	ENDIF
182
183	!
184	!-- 3D-array for storing the dissipation, needed for calculating the sgs
185	!-- particle velocities
186	IF ( use_sgs_for_particles ) THEN
187	ALLOCATE ( diss(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
188	ENDIF
189
190	IF ( dt_dosp /= 9999999.9 ) THEN
191	ALLOCATE( spectrum_x( 1:nx/2, 1:10, 1:10 ), &
192	spectrum_y( 1:ny/2, 1:10, 1:10 ) )
193	ENDIF
194
195	!
196	!-- 4D-array for storing the Rif-values at vertical walls
197	IF ( topography /= 'flat' ) THEN
198	ALLOCATE( rif_wall(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1,1:4) )
199	rif_wall = 0.0
200	ENDIF
201
202	!
203	!-- Velocities at nzb+1 needed for volume flow control
204	IF ( conserve_volume_flow ) THEN
205	ALLOCATE( u_nzb_p1_for_vfc(nys:nyn), v_nzb_p1_for_vfc(nxl:nxr) )
206	u_nzb_p1_for_vfc = 0.0
207	v_nzb_p1_for_vfc = 0.0
208	ENDIF
209
210	!
211	!-- Arrays to store velocity data from t-dt needed for radiation boundary
212	!-- conditions
213	IF ( outflow_l ) THEN
214	ALLOCATE( u_m_l(nzb:nzt+1,nys-1:nyn+1,-1:1), &
215	v_m_l(nzb:nzt+1,nys-1:nyn+1,-1:1), &
216	w_m_l(nzb:nzt+1,nys-1:nyn+1,-1:1) )
217	ENDIF
218	IF ( outflow_r ) THEN
219	ALLOCATE( u_m_r(nzb:nzt+1,nys-1:nyn+1,nx-1:nx+1), &
220	v_m_r(nzb:nzt+1,nys-1:nyn+1,nx-1:nx+1), &
221	w_m_r(nzb:nzt+1,nys-1:nyn+1,nx-1:nx+1) )
222	ENDIF
223	IF ( outflow_s ) THEN
224	ALLOCATE( u_m_s(nzb:nzt+1,-1:1,nxl-1:nxr+1), &
225	v_m_s(nzb:nzt+1,-1:1,nxl-1:nxr+1), &
226	w_m_s(nzb:nzt+1,-1:1,nxl-1:nxr+1) )
227	ENDIF
228	IF ( outflow_n ) THEN
229	ALLOCATE( u_m_n(nzb:nzt+1,ny-1:ny+1,nxl-1:nxr+1), &
230	v_m_n(nzb:nzt+1,ny-1:ny+1,nxl-1:nxr+1), &
231	w_m_n(nzb:nzt+1,ny-1:ny+1,nxl-1:nxr+1) )
232	ENDIF
233
234	!
235	!-- Initial assignment of the pointers
236	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
237
238	rif_m => rif_1; rif => rif_2
239	shf_m => shf_1; shf => shf_2
240	tswst_m => tswst_1; tswst => tswst_2
241	usws_m => usws_1; usws => usws_2
242	vsws_m => vsws_1; vsws => vsws_2
243	e_m => e_1; e => e_2; e_p => e_3; te_m => e_3
244	kh_m => kh_1; kh => kh_2
245	km_m => km_1; km => km_2
246	pt_m => pt_1; pt => pt_2; pt_p => pt_3; tpt_m => pt_3
247	u_m => u_1; u => u_2; u_p => u_3; tu_m => u_3
248	v_m => v_1; v => v_2; v_p => v_3; tv_m => v_3
249	w_m => w_1; w => w_2; w_p => w_3; tw_m => w_3
250
251	IF ( humidity .OR. passive_scalar ) THEN
252	qsws_m => qsws_1; qsws => qsws_2
253	qswst_m => qswst_1; qswst => qswst_2
254	q_m => q_1; q => q_2; q_p => q_3; tq_m => q_3
255	IF ( humidity ) vpt_m => vpt_1; vpt => vpt_2
256	IF ( cloud_physics ) ql => ql_1
257	IF ( cloud_droplets ) THEN
258	ql => ql_1
259	ql_c => ql_2
260	ENDIF
261	ENDIF
262
263	ELSE
264
265	rif => rif_1
266	shf => shf_1
267	tswst => tswst_1
268	usws => usws_1
269	vsws => vsws_1
270	e => e_1; e_p => e_2; te_m => e_3; e_m => e_3
271	kh => kh_1
272	km => km_1
273	pt => pt_1; pt_p => pt_2; tpt_m => pt_3; pt_m => pt_3
274	u => u_1; u_p => u_2; tu_m => u_3; u_m => u_3
275	v => v_1; v_p => v_2; tv_m => v_3; v_m => v_3
276	w => w_1; w_p => w_2; tw_m => w_3; w_m => w_3
277
278	IF ( humidity .OR. passive_scalar ) THEN
279	qsws => qsws_1
280	qswst => qswst_1
281	q => q_1; q_p => q_2; tq_m => q_3; q_m => q_3
282	IF ( humidity ) vpt => vpt_1
283	IF ( cloud_physics ) ql => ql_1
284	IF ( cloud_droplets ) THEN
285	ql => ql_1
286	ql_c => ql_2
287	ENDIF
288	ENDIF
289
290	ENDIF
291
292	!
293	!-- Initialize model variables
294	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
295	!
296	!-- First model run of a possible job queue.
297	!-- Initial profiles of the variables must be computes.
298	IF ( INDEX( initializing_actions, 'set_1d-model_profiles' ) /= 0 ) THEN
299	!
300	!-- Use solutions of the 1D model as initial profiles,
301	!-- start 1D model
302	CALL init_1d_model
303	!
304	!-- Transfer initial profiles to the arrays of the 3D model
305	DO i = nxl-1, nxr+1
306	DO j = nys-1, nyn+1
307	e(:,j,i) = e1d
308	kh(:,j,i) = kh1d
309	km(:,j,i) = km1d
310	pt(:,j,i) = pt_init
311	u(:,j,i) = u1d
312	v(:,j,i) = v1d
313	ENDDO
314	ENDDO
315
316	IF ( humidity .OR. passive_scalar ) THEN
317	DO i = nxl-1, nxr+1
318	DO j = nys-1, nyn+1
319	q(:,j,i) = q_init
320	ENDDO
321	ENDDO
322	ENDIF
323
324	IF ( .NOT. constant_diffusion ) THEN
325	DO i = nxl-1, nxr+1
326	DO j = nys-1, nyn+1
327	e(:,j,i) = e1d
328	ENDDO
329	ENDDO
330	!
331	!-- Store initial profiles for output purposes etc.
332	hom(:,1,25,:) = SPREAD( l1d, 2, statistic_regions+1 )
333
334	IF ( prandtl_layer ) THEN
335	rif = rif1d(nzb+1)
336	ts = 0.0 ! could actually be computed more accurately in the
337	! 1D model. Update when opportunity arises.
338	us = us1d
339	usws = usws1d
340	vsws = vsws1d
341	ELSE
342	ts = 0.0 ! must be set, because used in
343	rif = 0.0 ! flowste
344	us = 0.0
345	usws = 0.0
346	vsws = 0.0
347	ENDIF
348
349	ELSE
350	e = 0.0 ! must be set, because used in
351	rif = 0.0 ! flowste
352	ts = 0.0
353	us = 0.0
354	usws = 0.0
355	vsws = 0.0
356	ENDIF
357
358	!
359	!-- In every case qs = 0.0 (see also pt)
360	!-- This could actually be computed more accurately in the 1D model.
361	!-- Update when opportunity arises!
362	IF ( humidity .OR. passive_scalar ) qs = 0.0
363
364	!
365	!-- inside buildings set velocities back to zero
366	IF ( topography /= 'flat' ) THEN
367	DO i = nxl-1, nxr+1
368	DO j = nys-1, nyn+1
369	u(nzb:nzb_u_inner(j,i),j,i) = 0.0
370	v(nzb:nzb_v_inner(j,i),j,i) = 0.0
371	ENDDO
372	ENDDO
373	!
374	!-- WARNING: The extra boundary conditions set after running the
375	!-- ------- 1D model impose an error on the divergence one layer
376	!-- below the topography; need to correct later
377	!-- ATTENTION: Provisional correction for Piacsek & Williams
378	!-- --------- advection scheme: keep u and v zero one layer below
379	!-- the topography.
380	IF ( ibc_uv_b == 0 ) THEN
381	!
382	!-- Satisfying the Dirichlet condition with an extra layer below
383	!-- the surface where the u and v component change their sign.
384	DO i = nxl-1, nxr+1
385	DO j = nys-1, nyn+1
386	IF ( nzb_u_inner(j,i) == 0 ) u(0,j,i) = -u(1,j,i)
387	IF ( nzb_v_inner(j,i) == 0 ) v(0,j,i) = -v(1,j,i)
388	ENDDO
389	ENDDO
390
391	ELSE
392	!
393	!-- Neumann condition
394	DO i = nxl-1, nxr+1
395	DO j = nys-1, nyn+1
396	IF ( nzb_u_inner(j,i) == 0 ) u(0,j,i) = u(1,j,i)
397	IF ( nzb_v_inner(j,i) == 0 ) v(0,j,i) = v(1,j,i)
398	ENDDO
399	ENDDO
400
401	ENDIF
402
403	ENDIF
404
405	ELSEIF ( INDEX(initializing_actions, 'set_constant_profiles') /= 0 ) &
406	THEN
407	!
408	!-- Use constructed initial profiles (velocity constant with height,
409	!-- temperature profile with constant gradient)
410	DO i = nxl-1, nxr+1
411	DO j = nys-1, nyn+1
412	pt(:,j,i) = pt_init
413	u(:,j,i) = u_init
414	v(:,j,i) = v_init
415	ENDDO
416	ENDDO
417
418	!
419	!-- Set initial horizontal velocities at the lowest computational grid levels
420	!-- to zero in order to avoid too small time steps caused by the diffusion
421	!-- limit in the initial phase of a run (at k=1, dz/2 occurs in the
422	!-- limiting formula!). The original values are stored to be later used for
423	!-- volume flow control.
424	DO i = nxl-1, nxr+1
425	DO j = nys-1, nyn+1
426	u(nzb:nzb_u_inner(j,i)+1,j,i) = 0.0
427	v(nzb:nzb_v_inner(j,i)+1,j,i) = 0.0
428	ENDDO
429	ENDDO
430	IF ( conserve_volume_flow ) THEN
431	IF ( nxr == nx ) THEN
432	DO j = nys, nyn
433	k = nzb_u_inner(j,nx) + 1
434	u_nzb_p1_for_vfc(j) = u_init(k) * dzu(k)
435	ENDDO
436	ENDIF
437	IF ( nyn == ny ) THEN
438	DO i = nxl, nxr
439	k = nzb_v_inner(ny,i) + 1
440	v_nzb_p1_for_vfc(i) = v_init(k) * dzu(k)
441	ENDDO
442	ENDIF
443	ENDIF
444
445	IF ( humidity .OR. passive_scalar ) THEN
446	DO i = nxl-1, nxr+1
447	DO j = nys-1, nyn+1
448	q(:,j,i) = q_init
449	ENDDO
450	ENDDO
451	ENDIF
452
453
454	IF ( constant_diffusion ) THEN
455	km = km_constant
456	kh = km / prandtl_number
457	ELSE
458	kh = 0.01 ! there must exist an initial diffusion, because
459	km = 0.01 ! otherwise no TKE would be produced by the
460	! production terms, as long as not yet
461	! e = (u/cm)*2 at k=nzb+1
462	ENDIF
463	e = 0.0
464	rif = 0.0
465	ts = 0.0
466	us = 0.0
467	usws = 0.0
468	vsws = 0.0
469	IF ( humidity .OR. passive_scalar ) qs = 0.0
470
471	!
472	!-- Compute initial temperature field and other constants used in case
473	!-- of a sloping surface
474	IF ( sloping_surface ) CALL init_slope
475
476	ELSEIF ( INDEX(initializing_actions, 'by_user') /= 0 ) &
477	THEN
478	!
479	!-- Initialization will completely be done by the user
480	CALL user_init_3d_model
481
482	ENDIF
483
484	!
485	!-- Calculate virtual potential temperature
486	IF ( humidity ) vpt = pt * ( 1.0 + 0.61 * q )
487
488	!
489	!-- Store initial profiles for output purposes etc.
490	hom(:,1,5,:) = SPREAD( u(:,nys,nxl), 2, statistic_regions+1 )
491	hom(:,1,6,:) = SPREAD( v(:,nys,nxl), 2, statistic_regions+1 )
492	IF ( ibc_uv_b == 0 ) THEN
493	hom(nzb,1,5,:) = -hom(nzb+1,1,5,:) ! due to satisfying the Dirichlet
494	hom(nzb,1,6,:) = -hom(nzb+1,1,6,:) ! condition with an extra layer
495	! below the surface where the u and v component change their sign
496	ENDIF
497	hom(:,1,7,:) = SPREAD( pt(:,nys,nxl), 2, statistic_regions+1 )
498	hom(:,1,23,:) = SPREAD( km(:,nys,nxl), 2, statistic_regions+1 )
499	hom(:,1,24,:) = SPREAD( kh(:,nys,nxl), 2, statistic_regions+1 )
500
501
502	IF ( humidity ) THEN
503	!
504	!-- Store initial profile of total water content, virtual potential
505	!-- temperature
506	hom(:,1,26,:) = SPREAD( q(:,nys,nxl), 2, statistic_regions+1 )
507	hom(:,1,29,:) = SPREAD( vpt(:,nys,nxl), 2, statistic_regions+1 )
508	IF ( cloud_physics .OR. cloud_droplets ) THEN
509	!
510	!-- Store initial profile of specific humidity and potential
511	!-- temperature
512	hom(:,1,27,:) = SPREAD( q(:,nys,nxl), 2, statistic_regions+1 )
513	hom(:,1,28,:) = SPREAD( pt(:,nys,nxl), 2, statistic_regions+1 )
514	ENDIF
515	ENDIF
516
517	IF ( passive_scalar ) THEN
518	!
519	!-- Store initial scalar profile
520	hom(:,1,26,:) = SPREAD( q(:,nys,nxl), 2, statistic_regions+1 )
521	ENDIF
522
523	!
524	!-- Initialize fluxes at bottom surface
525	IF ( use_surface_fluxes ) THEN
526
527	IF ( constant_heatflux ) THEN
528	!
529	!-- Heat flux is prescribed
530	IF ( random_heatflux ) THEN
531	CALL disturb_heatflux
532	ELSE
533	shf = surface_heatflux
534	!
535	!-- Over topography surface_heatflux is replaced by wall_heatflux(0)
536	IF ( TRIM( topography ) /= 'flat' ) THEN
537	DO i = nxl-1, nxr+1
538	DO j = nys-1, nyn+1
539	IF ( nzb_s_inner(j,i) /= 0 ) THEN
540	shf(j,i) = wall_heatflux(0)
541	ENDIF
542	ENDDO
543	ENDDO
544	ENDIF
545	ENDIF
546	IF ( ASSOCIATED( shf_m ) ) shf_m = shf
547	ENDIF
548
549	!
550	!-- Determine the near-surface water flux
551	IF ( humidity .OR. passive_scalar ) THEN
552	IF ( constant_waterflux ) THEN
553	qsws = surface_waterflux
554	IF ( ASSOCIATED( qsws_m ) ) qsws_m = qsws
555	ENDIF
556	ENDIF
557
558	ENDIF
559
560	!
561	!-- Initialize fluxes at top surface
562	!-- Currently, only the heatflux can be prescribed. The latent flux is
563	!-- zero in this case!
564	IF ( use_top_fluxes ) THEN
565
566	IF ( constant_top_heatflux ) THEN
567	!
568	!-- Heat flux is prescribed
569	tswst = top_heatflux
570	IF ( ASSOCIATED( tswst_m ) ) tswst_m = tswst
571
572	IF ( humidity .OR. passive_scalar ) THEN
573	qswst = 0.0
574	IF ( ASSOCIATED( qswst_m ) ) qswst_m = qswst
575	ENDIF
576	ENDIF
577
578	ENDIF
579
580	!
581	!-- Initialize Prandtl layer quantities
582	IF ( prandtl_layer ) THEN
583
584	z0 = roughness_length
585
586	IF ( .NOT. constant_heatflux ) THEN
587	!
588	!-- Surface temperature is prescribed. Here the heat flux cannot be
589	!-- simply estimated, because therefore rif, u* and theta* would have
590	!-- to be computed by iteration. This is why the heat flux is assumed
591	!-- to be zero before the first time step. It approaches its correct
592	!-- value in the course of the first few time steps.
593	shf = 0.0
594	IF ( ASSOCIATED( shf_m ) ) shf_m = 0.0
595	ENDIF
596
597	IF ( humidity .OR. passive_scalar ) THEN
598	IF ( .NOT. constant_waterflux ) THEN
599	qsws = 0.0
600	IF ( ASSOCIATED( qsws_m ) ) qsws_m = 0.0
601	ENDIF
602	ENDIF
603
604	ENDIF
605
606	!
607	!-- Calculate the initial volume flow at the right and north boundary
608	IF ( conserve_volume_flow ) THEN
609
610	volume_flow_initial_l = 0.0
611	volume_flow_area_l = 0.0
612
613	IF ( nxr == nx ) THEN
614	DO j = nys, nyn
615	DO k = nzb_2d(j,nx) + 1, nzt
616	volume_flow_initial_l(1) = volume_flow_initial_l(1) + &
617	u(k,j,nx) * dzu(k)
618	volume_flow_area_l(1) = volume_flow_area_l(1) + dzu(k)
619	ENDDO
620	!
621	!-- Correction if velocity at nzb+1 has been set zero further above
622	volume_flow_initial_l(1) = volume_flow_initial_l(1) + &
623	u_nzb_p1_for_vfc(j)
624	ENDDO
625	ENDIF
626
627	IF ( nyn == ny ) THEN
628	DO i = nxl, nxr
629	DO k = nzb_2d(ny,i) + 1, nzt
630	volume_flow_initial_l(2) = volume_flow_initial_l(2) + &
631	v(k,ny,i) * dzu(k)
632	volume_flow_area_l(2) = volume_flow_area_l(2) + dzu(k)
633	ENDDO
634	!
635	!-- Correction if velocity at nzb+1 has been set zero further above
636	volume_flow_initial_l(2) = volume_flow_initial_l(2) + &
637	v_nzb_p1_for_vfc(i)
638	ENDDO
639	ENDIF
640
641	#if defined( __parallel )
642	CALL MPI_ALLREDUCE( volume_flow_initial_l(1), volume_flow_initial(1),&
643	2, MPI_REAL, MPI_SUM, comm2d, ierr )
644	CALL MPI_ALLREDUCE( volume_flow_area_l(1), volume_flow_area(1), &
645	2, MPI_REAL, MPI_SUM, comm2d, ierr )
646	#else
647	volume_flow_initial = volume_flow_initial_l
648	volume_flow_area = volume_flow_area_l
649	#endif
650	ENDIF
651
652	!
653	!-- For the moment, perturbation pressure and vertical velocity are zero
654	p = 0.0; w = 0.0
655
656	!
657	!-- Initialize array sums (must be defined in first call of pres)
658	sums = 0.0
659
660	!
661	!-- Treating cloud physics, liquid water content and precipitation amount
662	!-- are zero at beginning of the simulation
663	IF ( cloud_physics ) THEN
664	ql = 0.0
665	IF ( precipitation ) precipitation_amount = 0.0
666	ENDIF
667
668	!
669	!-- Initialize spectra
670	IF ( dt_dosp /= 9999999.9 ) THEN
671	spectrum_x = 0.0
672	spectrum_y = 0.0
673	ENDIF
674
675	!
676	!-- Impose vortex with vertical axis on the initial velocity profile
677	IF ( INDEX( initializing_actions, 'initialize_vortex' ) /= 0 ) THEN
678	CALL init_rankine
679	ENDIF
680
681	!
682	!-- Impose temperature anomaly (advection test only)
683	IF ( INDEX( initializing_actions, 'initialize_ptanom' ) /= 0 ) THEN
684	CALL init_pt_anomaly
685	ENDIF
686
687	!
688	!-- If required, change the surface temperature at the start of the 3D run
689	IF ( pt_surface_initial_change /= 0.0 ) THEN
690	pt(nzb,:,:) = pt(nzb,:,:) + pt_surface_initial_change
691	ENDIF
692
693	!
694	!-- If required, change the surface humidity/scalar at the start of the 3D
695	!-- run
696	IF ( ( humidity .OR. passive_scalar ) .AND. &
697	q_surface_initial_change /= 0.0 ) THEN
698	q(nzb,:,:) = q(nzb,:,:) + q_surface_initial_change
699	ENDIF
700
701	!
702	!-- Initialize the random number generator (from numerical recipes)
703	CALL random_function_ini
704
705	!
706	!-- Impose random perturbation on the horizontal velocity field and then
707	!-- remove the divergences from the velocity field
708	IF ( create_disturbances ) THEN
709	CALL disturb_field( nzb_u_inner, tend, u )
710	CALL disturb_field( nzb_v_inner, tend, v )
711	n_sor = nsor_ini
712	CALL pres
713	n_sor = nsor
714	ENDIF
715
716	!
717	!-- Once again set the perturbation pressure explicitly to zero in order to
718	!-- assure that it does not generate any divergences in the first time step.
719	!-- At t=0 the velocity field is free of divergence (as constructed above).
720	!-- Divergences being created during a time step are not yet known and thus
721	!-- cannot be corrected during the time step yet.
722	p = 0.0
723
724	!
725	!-- Initialize old and new time levels.
726	IF ( timestep_scheme(1:5) /= 'runge' ) THEN
727	e_m = e; pt_m = pt; u_m = u; v_m = v; w_m = w; kh_m = kh; km_m = km
728	ELSE
729	te_m = 0.0; tpt_m = 0.0; tu_m = 0.0; tv_m = 0.0; tw_m = 0.0
730	ENDIF
731	e_p = e; pt_p = pt; u_p = u; v_p = v; w_p = w
732
733	IF ( humidity .OR. passive_scalar ) THEN
734	IF ( ASSOCIATED( q_m ) ) q_m = q
735	IF ( timestep_scheme(1:5) == 'runge' ) tq_m = 0.0
736	q_p = q
737	IF ( humidity .AND. ASSOCIATED( vpt_m ) ) vpt_m = vpt
738	ENDIF
739
740	!
741	!-- Initialize old timelevels needed for radiation boundary conditions
742	IF ( outflow_l ) THEN
743	u_m_l(:,:,:) = u(:,:,-1:1)
744	v_m_l(:,:,:) = v(:,:,-1:1)
745	w_m_l(:,:,:) = w(:,:,-1:1)
746	ENDIF
747	IF ( outflow_r ) THEN
748	u_m_r(:,:,:) = u(:,:,nx-1:nx+1)
749	v_m_r(:,:,:) = v(:,:,nx-1:nx+1)
750	w_m_r(:,:,:) = w(:,:,nx-1:nx+1)
751	ENDIF
752	IF ( outflow_s ) THEN
753	u_m_s(:,:,:) = u(:,-1:1,:)
754	v_m_s(:,:,:) = v(:,-1:1,:)
755	w_m_s(:,:,:) = w(:,-1:1,:)
756	ENDIF
757	IF ( outflow_n ) THEN
758	u_m_n(:,:,:) = u(:,ny-1:ny+1,:)
759	v_m_n(:,:,:) = v(:,ny-1:ny+1,:)
760	w_m_n(:,:,:) = w(:,ny-1:ny+1,:)
761	ENDIF
762
763	ELSEIF ( TRIM( initializing_actions ) == 'read_restart_data' ) &
764	THEN
765	!
766	!-- Read binary data from restart file
767	CALL read_3d_binary
768
769	!
770	!-- Calculate initial temperature field and other constants used in case
771	!-- of a sloping surface
772	IF ( sloping_surface ) CALL init_slope
773
774	!
775	!-- Initialize new time levels (only done in order to set boundary values
776	!-- including ghost points)
777	e_p = e; pt_p = pt; u_p = u; v_p = v; w_p = w
778	IF ( humidity .OR. passive_scalar ) q_p = q
779
780	ELSE
781	!
782	!-- Actually this part of the programm should not be reached
783	IF ( myid == 0 ) PRINT*,'+++ init_3d_model: unknown initializing ', &
784	'problem'
785	CALL local_stop
786	ENDIF
787
788	!
789	!-- If required, initialize dvrp-software
790	IF ( dt_dvrp /= 9999999.9 ) CALL init_dvrp
791
792	!
793	!-- If required, initialize quantities for handling cloud physics
794	!-- This routine must be called before init_particles, because
795	!-- otherwise, array pt_d_t, needed in data_output_dvrp (called by
796	!-- init_particles) is not defined.
797	CALL init_cloud_physics
798
799	!
800	!-- If required, initialize particles
801	IF ( particle_advection ) CALL init_particles
802
803	!
804	!-- Initialize quantities for special advections schemes
805	CALL init_advec
806
807	!
808	!-- Initialize Rayleigh damping factors
809	rdf = 0.0
810	IF ( rayleigh_damping_factor /= 0.0 ) THEN
811	DO k = nzb+1, nzt
812	IF ( zu(k) >= rayleigh_damping_height ) THEN
813	rdf(k) = rayleigh_damping_factor * &
814	( SIN( pi * 0.5 * ( zu(k) - rayleigh_damping_height ) &
815	/ ( zu(nzt) - rayleigh_damping_height ) )&
816	)**2
817	ENDIF
818	ENDDO
819	ENDIF
820
821	!
822	!-- Initialize diffusivities used within the outflow damping layer in case of
823	!-- non-cyclic lateral boundaries. A linear increase is assumed over the first
824	!-- half of the width of the damping layer
825	IF ( bc_lr == 'dirichlet/radiation' ) THEN
826
827	DO i = nxl-1, nxr+1
828	IF ( i >= nx - outflow_damping_width ) THEN
829	km_damp_x(i) = km_damp_max * MIN( 1.0, &
830	( i - ( nx - outflow_damping_width ) ) / &
831	REAL( outflow_damping_width/2 ) &
832	)
833	ELSE
834	km_damp_x(i) = 0.0
835	ENDIF
836	ENDDO
837
838	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
839
840	DO i = nxl-1, nxr+1
841	IF ( i <= outflow_damping_width ) THEN
842	km_damp_x(i) = km_damp_max * MIN( 1.0, &
843	( outflow_damping_width - i ) / &
844	REAL( outflow_damping_width/2 ) &
845	)
846	ELSE
847	km_damp_x(i) = 0.0
848	ENDIF
849	ENDDO
850
851	ENDIF
852
853	IF ( bc_ns == 'dirichlet/radiation' ) THEN
854
855	DO j = nys-1, nyn+1
856	IF ( j >= ny - outflow_damping_width ) THEN
857	km_damp_y(j) = km_damp_max * MIN( 1.0, &
858	( j - ( ny - outflow_damping_width ) ) / &
859	REAL( outflow_damping_width/2 ) &
860	)
861	ELSE
862	km_damp_y(j) = 0.0
863	ENDIF
864	ENDDO
865
866	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
867
868	DO j = nys-1, nyn+1
869	IF ( j <= outflow_damping_width ) THEN
870	km_damp_y(j) = km_damp_max * MIN( 1.0, &
871	( outflow_damping_width - j ) / &
872	REAL( outflow_damping_width/2 ) &
873	)
874	ELSE
875	km_damp_y(j) = 0.0
876	ENDIF
877	ENDDO
878
879	ENDIF
880
881	!
882	!-- Initialize local summation arrays for UP flow_statistics. This is necessary
883	!-- because they may not yet have been initialized when they are called from
884	!-- flow_statistics (or - depending on the chosen model run - are never
885	!-- initialized)
886	sums_divnew_l = 0.0
887	sums_divold_l = 0.0
888	sums_l_l = 0.0
889	sums_up_fraction_l = 0.0
890	sums_wsts_bc_l = 0.0
891
892	!
893	!-- Pre-set masks for regional statistics. Default is the total model domain.
894	rmask = 1.0
895
896	!
897	!-- User-defined initializing actions. Check afterwards, if maximum number
898	!-- of allowed timeseries is not exceeded
899	CALL user_init
900
901	IF ( dots_num > dots_max ) THEN
902	IF ( myid == 0 ) THEN
903	PRINT*, '+++ user_init: number of time series quantities exceeds', &
904	' its maximum of dots_max = ', dots_max
905	PRINT*, ' Please increase dots_max in modules.f90.'
906	ENDIF
907	CALL local_stop
908	ENDIF
909
910	!
911	!-- Input binary data file is not needed anymore. This line must be placed
912	!-- after call of user_init!
913	CALL close_file( 13 )
914
915	!
916	!-- Compute total sum of active mask grid points
917	!-- ngp_2dh: number of grid points of a horizontal cross section through the
918	!-- total domain
919	!-- ngp_3d: number of grid points of the total domain
920	!-- Note: The lower vertical index nzb_s_outer imposes a small error on the 2D
921	!-- ---- averages of staggered variables such as u and v due to the topography
922	!-- arrangement on the staggered grid. Maybe revise later.
923	ngp_2dh_outer_l = 0
924	ngp_2dh_outer = 0
925	ngp_2dh_l = 0
926	ngp_2dh = 0
927	ngp_3d_inner_l = 0
928	ngp_3d_inner = 0
929	ngp_3d = 0
930	ngp_sums = ( nz + 2 ) * var_sum
931
932	DO sr = 0, statistic_regions
933	DO i = nxl, nxr
934	DO j = nys, nyn
935	IF ( rmask(j,i,sr) == 1.0 ) THEN
936	!
937	!-- All xy-grid points
938	ngp_2dh_l(sr) = ngp_2dh_l(sr) + 1
939	!
940	!-- xy-grid points above topography
941	DO k = nzb_s_outer(j,i), nz + 1
942	ngp_2dh_outer_l(k,sr) = ngp_2dh_outer_l(k,sr) + 1
943	ENDDO
944	!
945	!-- All grid points of the total domain above topography
946	ngp_3d_inner_l(sr) = ngp_3d_inner_l(sr) + &
947	( nz - nzb_s_inner(j,i) + 2 )
948	ENDIF
949	ENDDO
950	ENDDO
951	ENDDO
952
953	sr = statistic_regions + 1
954	#if defined( __parallel )
955	CALL MPI_ALLREDUCE( ngp_2dh_l(0), ngp_2dh(0), sr, MPI_INTEGER, MPI_SUM, &
956	comm2d, ierr )
957	CALL MPI_ALLREDUCE( ngp_2dh_outer_l(0,0), ngp_2dh_outer(0,0), (nz+2)*sr, &
958	MPI_INTEGER, MPI_SUM, comm2d, ierr )
959	CALL MPI_ALLREDUCE( ngp_3d_inner_l(0), ngp_3d_inner(0), sr, MPI_INTEGER, &
960	MPI_SUM, comm2d, ierr )
961	#else
962	ngp_2dh = ngp_2dh_l
963	ngp_2dh_outer = ngp_2dh_outer_l
964	ngp_3d_inner = ngp_3d_inner_l
965	#endif
966
967	ngp_3d = ngp_2dh * ( nz + 2 )
968
969	!
970	!-- Set a lower limit of 1 in order to avoid zero divisions in flow_statistics,
971	!-- buoyancy, etc. A zero value will occur for cases where all grid points of
972	!-- the respective subdomain lie below the surface topography
973	ngp_2dh_outer = MAX( 1, ngp_2dh_outer(:,:) )
974	ngp_3d_inner = MAX( 1, ngp_3d_inner(:) )
975
976	DEALLOCATE( ngp_2dh_l, ngp_2dh_outer_l, ngp_3d_inner_l )
977
978
979	END SUBROUTINE init_3d_model

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