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cdrag_mod.F90 @ 4766

Last change on this file since 4766 was 4721, checked in by Laurent Fairhead, 13 months ago
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1	!
2	MODULE cdrag_mod
3	!
4	! This module contains some procedures for calculation of the cdrag
5	! coefficients for turbulent diffusion at surface
6	!
7	IMPLICIT NONE
8
9	CONTAINS
10	!
11	!****************************************************************************************
12	!
13	!r original routine svn3623
14	!
15	SUBROUTINE cdrag(knon, nsrf, &
16	speed, t1, q1, zgeop1, &
17	psol, pblh, tsurf, qsurf, z0m, z0h, &
18	ri_in, iri_in, &
19	cdm, cdh, zri, pref, prain, tsol , pat1)
20
21	USE dimphy
22	USE indice_sol_mod
23	USE print_control_mod, ONLY: lunout, prt_level
24	USE ioipsl_getin_p_mod, ONLY : getin_p
25	USE atke_turbulence_ini_mod, ONLY : ric, cinf, cepsilon, pr_slope, pr_asym, pr_neut
26
27	IMPLICIT NONE
28	! ================================================================= c
29	!
30	! Objet : calcul des cdrags pour le moment (pcfm) et
31	! les flux de chaleur sensible et latente (pcfh) d'apr??s
32	! Louis 1982, Louis 1979, King et al 2001
33	! ou Zilitinkevich et al 2002 pour les cas stables, Louis 1979
34	! et 1982 pour les cas instables
35	!
36	! Modified history:
37	! writting on the 20/05/2016
38	! modified on the 13/12/2016 to be adapted to LMDZ6
39	!
40	! References:
41	! Louis, J. F., 1979: A parametric model of vertical eddy fluxes in the
42	! atmosphere. Boundary-Layer Meteorology. 01/1979; 17(2):187-202.
43	! Louis, J. F., Tiedtke, M. and Geleyn, J. F., 1982: `A short history of the
44	! operational PBL parametrization at ECMWF'. Workshop on boundary layer
45	! parametrization, November 1981, ECMWF, Reading, England.
46	! Page: 19. Equations in Table 1.
47	! Mascart P, Noilhan J, Giordani H 1995.A MODIFIED PARAMETERIZATION OF FLUX-PROFILE RELATIONSHIPS
48	! IN THE SURFACE LAYER USING DIFFERENT ROUGHNESS LENGTH VALUES FOR HEAT AND MOMENTUM
49	! Boundary-Layer Meteorology 72: 331-344
50	! Anton Beljaars. May 1992. The parametrization of the planetary boundary layer.
51	! European Centre for Medium-Range Weather Forecasts.
52	! Equations: 110-113. Page 40.
53	! Miller,M.J., A.C.M.Beljaars, T.N.Palmer. 1992. The sensitivity of the ECMWF
54	! model to the parameterization of evaporation from the tropical oceans. J.
55	! Climate, 5:418-434.
56	! King J.C, Connolley, W.M ad Derbyshire S.H. 2001, Sensitivity of Modelled Antarctic climate
57	! to surface and boundary-layer flux parametrizations
58	! QJRMS, 127, pp 779-794
59	!
60	! ================================================================= c
61	! ================================================================= c
62	! On choisit le couple de fonctions de correction avec deux flags:
63	! Un pour les cas instables, un autre pour les cas stables
64	!
65	! iflag_corr_insta:
66	! 1: Louis 1979 avec les modifications de Mascart 1995 (z0/= z0h)
67	! 2: Louis 1982
68	! 3: Laurent Li
69	!
70	! iflag_corr_sta:
71	! 1: Louis 1979 avec les modifications de Mascart 1995 (z0/= z0h)
72	! 2: Louis 1982
73	! 3: Laurent Li
74	! 4: King 2001 (SHARP)
75	! 5: MO 1st order theory (allow collapse of turbulence)
76	!
77	!
78	!*****************************************************************
79	! Parametres d'entree
80	!*****************************************************************
81
82	INTEGER, INTENT(IN) :: knon, nsrf ! nombre de points de grille sur l'horizontal + type de surface
83	REAL, DIMENSION(klon), INTENT(IN) :: speed ! module du vent au 1er niveau du modele
84	REAL, DIMENSION(klon), INTENT(IN) :: zgeop1 ! geopotentiel au 1er niveau du modele
85	REAL, DIMENSION(klon), INTENT(IN) :: tsurf ! Surface temperature (K)
86	REAL, DIMENSION(klon), INTENT(IN) :: qsurf ! Surface humidity (Kg/Kg)
87	REAL, DIMENSION(klon), INTENT(INOUT) :: z0m, z0h ! Rugosity at surface (m)
88	REAL, DIMENSION(klon), INTENT(IN) :: ri_in ! Input Richardson 1st layer for first guess calculations of screen var.
89	INTEGER, INTENT(IN) :: iri_in! iflag to activate cdrag calculation using ri1
90	REAL, DIMENSION(klon), INTENT(IN) :: t1 ! Temperature au premier niveau (K)
91	REAL, DIMENSION(klon), INTENT(IN) :: q1 ! humidite specifique au premier niveau (kg/kg)
92	REAL, DIMENSION(klon), INTENT(IN) :: psol ! pression au sol
93
94	!------------------ Rajout pour COARE (OT2018) --------------------
95	REAL, DIMENSION(klon), INTENT(INOUT) :: pblh !hauteur de CL
96	REAL, DIMENSION(klon), INTENT(IN) :: prain !rapport au precipitation
97	REAL, DIMENSION(klon), INTENT(IN) :: tsol !SST imposé sur la surface oceanique
98	REAL, DIMENSION(klon), INTENT(IN) :: pat1 !pression premier lev
99
100
101
102	! Parametres de sortie
103	!******************************************************************
104	REAL, DIMENSION(klon), INTENT(OUT) :: cdm ! Drag coefficient for momentum
105	REAL, DIMENSION(klon), INTENT(OUT) :: cdh ! Drag coefficient for heat flux
106	REAL, DIMENSION(klon), INTENT(OUT) :: zri ! Richardson number
107	REAL, DIMENSION(klon), INTENT(INOUT) :: pref ! Pression au niveau zgeop/RG
108
109	! Variables Locales
110	!******************************************************************
111
112
113	INCLUDE "YOMCST.h"
114	INCLUDE "YOETHF.h"
115	INCLUDE "clesphys.h"
116
117
118	REAL, PARAMETER :: CKAP=0.40, CKAPT=0.42
119	REAL CEPDU2
120	REAL ALPHA
121	REAL CB,CC,CD,C2,C3
122	REAL MU, CM, CH, B, CMstar, CHstar
123	REAL PM, PH, BPRIME
124	INTEGER ng_q1 ! Number of grids that q1 < 0.0
125	INTEGER ng_qsurf ! Number of grids that qsurf < 0.0
126	INTEGER i, k
127	REAL zdu2, ztsolv
128	REAL ztvd, zscf
129	REAL zucf, zcr
130	REAL, DIMENSION(klon) :: FM, FH ! stability functions
131	REAL, DIMENSION(klon) :: cdmn, cdhn ! Drag coefficient in neutral conditions
132	REAL zzzcd
133	REAL, DIMENSION(klon) :: sm, prandtl ! Stability function from atke turbulence scheme
134	REAL ri0, ri1, cn ! to have dimensionless term in sm and prandtl
135
136	!------------------ Rajout (OT2018) --------------------
137	!------------------ Rajout pour les appelles BULK (OT) --------------------
138	REAL, DIMENSION(klon,2) :: rugos_itm
139	REAL, DIMENSION(klon,2) :: rugos_ith
140	REAL, PARAMETER :: tol_it_rugos=1.e-4
141	REAL, DIMENSION(3) :: coeffs
142	LOGICAL :: mixte
143	REAL :: z_0m
144	REAL :: z_0h
145	REAL, DIMENSION(klon) :: cdmm
146	REAL, DIMENSION(klon) :: cdhh
147
148	!------------------RAJOUT POUR ECUME -------------------
149
150	REAL, DIMENSION(klon) :: PQSAT
151	REAL, DIMENSION(klon) :: PSFTH
152	REAL, DIMENSION(klon) :: PFSTQ
153	REAL, DIMENSION(klon) :: PUSTAR
154	REAL, DIMENSION(klon) :: PCD ! Drag coefficient for momentum
155	REAL, DIMENSION(klon) :: PCDN ! Drag coefficient for momentum
156	REAL, DIMENSION(klon) :: PCH ! Drag coefficient for momentum
157	REAL, DIMENSION(klon) :: PCE ! Drag coefficient for momentum
158	REAL, DIMENSION(klon) :: PRI
159	REAL, DIMENSION(klon) :: PRESA
160	REAL, DIMENSION(klon) :: PSSS
161
162	LOGICAL :: OPRECIP
163	LOGICAL :: OPWEBB
164	LOGICAL :: OPERTFLUX
165	LOGICAL :: LPRECIP
166	LOGICAL :: LPWG
167
168
169
170	LOGICAL, SAVE :: firstcall = .TRUE.
171	!$OMP THREADPRIVATE(firstcall)
172	INTEGER, SAVE :: iflag_corr_sta
173	!$OMP THREADPRIVATE(iflag_corr_sta)
174	INTEGER, SAVE :: iflag_corr_insta
175	!$OMP THREADPRIVATE(iflag_corr_insta)
176	LOGICAL, SAVE :: ok_cdrag_iter
177	!$OMP THREADPRIVATE(ok_cdrag_iter)
178
179	!===================================================================c
180	! Valeurs numeriques des constantes
181	!===================================================================c
182
183
184	! Minimum du carre du vent
185
186	CEPDU2 = (0.1)**2
187
188	! Louis 1982
189
190	CB=5.0
191	CC=5.0
192	CD=5.0
193
194
195	! King 2001
196
197	C2=0.25
198	C3=0.0625
199
200
201	! Louis 1979
202
203	BPRIME=4.7
204	B=9.4
205
206
207	!MO
208
209	ALPHA=5.0
210
211	! Consistent with atke scheme
212	cn=(1./sqrt(cepsilon))**(2./3.)
213	ri0=2./rpi(cinf - cn)ric/cn
214	ri1=-2./rpi * (pr_asym - pr_neut)/pr_slope
215
216
217	! ================================================================= c
218	! Tests avant de commencer
219	! Fuxing WANG, 04/03/2015
220	! To check if there are negative q1, qsurf values.
221	!====================================================================c
222	ng_q1 = 0 ! Initialization
223	ng_qsurf = 0 ! Initialization
224	DO i = 1, knon
225	IF (q1(i).LT.0.0) ng_q1 = ng_q1 + 1
226	IF (qsurf(i).LT.0.0) ng_qsurf = ng_qsurf + 1
227	ENDDO
228	IF (ng_q1.GT.0 .and. prt_level > 5) THEN
229	WRITE(lunout,)" ** Warning: Negative q1(humidity at 1st level) values in cdrag.F90 !"
230	WRITE(lunout,*)" The total number of the grids is: ", ng_q1
231	WRITE(lunout,*)" The negative q1 is set to zero "
232	! abort_message="voir ci-dessus"
233	! CALL abort_physic(modname,abort_message,1)
234	ENDIF
235	IF (ng_qsurf.GT.0 .and. prt_level > 5) THEN
236	WRITE(lunout,)" ** Warning: Negative qsurf(humidity at surface) values in cdrag.F90 !"
237	WRITE(lunout,*)" The total number of the grids is: ", ng_qsurf
238	WRITE(lunout,*)" The negative qsurf is set to zero "
239	! abort_message="voir ci-dessus"
240	! CALL abort_physic(modname,abort_message,1)
241	ENDIF
242
243
244
245	!=============================================================================c
246	! Calcul du cdrag
247	!=============================================================================c
248
249	! On choisit les fonctions de stabilite utilisees au premier appel
250	!**************************************************************************
251	IF (firstcall) THEN
252	iflag_corr_sta=2
253	iflag_corr_insta=2
254	ok_cdrag_iter = .FALSE.
255
256	CALL getin_p('iflag_corr_sta',iflag_corr_sta)
257	CALL getin_p('iflag_corr_insta',iflag_corr_insta)
258	CALL getin_p('ok_cdrag_iter',ok_cdrag_iter)
259
260	firstcall = .FALSE.
261	ENDIF
262
263	!------------------ Rajout (OT2018) --------------------
264	!--------- Rajout pour itération sur rugosité ----------------
265	rugos_itm(:,2) = z0m
266	rugos_itm(:,1) = 3.tol_it_rugosz0m
267
268	rugos_ith(:,2) = z0h !cp nouveau rugos_it
269	rugos_ith(:,1) = 3.tol_it_rugosz0h
270	!--------------------------------------------------------------------
271
272	!xxxxxxxxxxxxxxxxxxxxxxx
273	DO i = 1, knon ! Boucle sur l'horizontal
274	!xxxxxxxxxxxxxxxxxxxxxxx
275
276
277	! calculs preliminaires:
278	!***********************
279
280	zdu2 = MAX(CEPDU2, speed(i)**2)
281	pref(i) = EXP(LOG(psol(i)) - zgeop1(i)/(RDt1(i) &
282	(1.+ RETV * max(q1(i),0.0)))) ! negative q1 set to zero
283	ztsolv = tsurf(i) * (1.0+RETV*max(qsurf(i),0.0)) ! negative qsurf set to zero
284	ztvd = (t1(i)+zgeop1(i)/RCPD/(1.+RVTMP2*q1(i))) &
285	(1.+RETVmax(q1(i),0.0)) ! negative q1 set to zero
286
287	!------------------ Rajout (OT2018) --------------------
288	!-------------- ON DUPLIQUE POUR METTRE ITERATION SUR OCEAN ------------------------
289	IF (iri_in.EQ.1) THEN
290	zri(i) = ri_in(i)
291	ENDIF
292
293	IF (nsrf == is_oce) THEN
294
295	!------------------ Pour Core 2 choix Core Pur ou Core Mixte --------------------
296	IF ((choix_bulk > 1 .AND. choix_bulk < 4) .AND. (nsrf .eq. is_oce)) THEN
297	IF(choix_bulk .eq. 2) THEN
298	mixte = .false.
299	ELSE
300	mixte = .true.
301	ENDIF
302	call clc_core_cp ( sqrt(zdu2),t1(i)-tsurf(i),q1(i)-qsurf(i),t1(i),q1(i),&
303	zgeop1(i)/RG, zgeop1(i)/RG, zgeop1(i)/RG,&
304	psol(i),nit_bulk,mixte,&
305	coeffs,z_0m,z_0h)
306	cdmm(i) = coeffs(1)
307	cdhh(i) = coeffs(2)
308	cdm(i)=cdmm(i)
309	cdh(i)=cdhh(i)
310	write(,) "clc_core cd ch",cdmm(i),cdhh(i)
311
312	!------------------ Pour ECUME --------------------
313	ELSE IF ((choix_bulk .eq. 4) .and. (nsrf .eq. is_oce)) THEN
314	OPRECIP = .false.
315	OPWEBB = .false.
316	OPERTFLUX = .false.
317	IF (nsrf .eq. is_oce) THEN
318	PSSS = 0.0
319	ENDIF
320	call ini_csts
321	call ecumev6_flux( z_0m,t1(i),tsurf(i),&
322	q1(i),qsurf(i),sqrt(zdu2),zgeop1(i)/RG,PSSS,zgeop1(i)/RG,&
323	psol(i),pat1(i), OPRECIP, OPWEBB,&
324	PSFTH,PFSTQ,PUSTAR,PCD,PCDN,&
325	PCH,PCE,PRI,PRESA,prain,&
326	z_0h,OPERTFLUX,coeffs)
327
328	cdmm(i) = coeffs(1)
329	cdhh(i) = coeffs(2)
330	cdm(i)=cdmm(i)
331	cdh(i)=cdhh(i)
332
333	write(,) "ecume cd ch",cdmm(i),cdhh(i)
334
335	!------------------ Pour COARE CNRM --------------------
336	ELSE IF ((choix_bulk .eq. 5) .and. (nsrf .eq. is_oce)) THEN
337	LPRECIP = .false.
338	LPWG = .false.
339	call ini_csts
340	call coare30_flux_cnrm(z_0m,t1(i),tsurf(i), q1(i), &
341	sqrt(zdu2),zgeop1(i)/RG,zgeop1(i)/RG,psol(i),qsurf(i),PQSAT, &
342	PSFTH,PFSTQ,PUSTAR,PCD,PCDN,PCH,PCE,PRI, &
343	PRESA,prain,pat1(i),z_0h, LPRECIP, LPWG, coeffs)
344	cdmm(i) = coeffs(1)
345	cdhh(i) = coeffs(2)
346	cdm(i)=cdmm(i)
347	cdh(i)=cdhh(i)
348	write(,) "coare CNRM cd ch",cdmm(i),cdhh(i)
349
350	!------------------ Pour COARE Maison --------------------
351	ELSE IF ((choix_bulk .eq. 1) .and. (nsrf .eq. is_oce)) THEN
352	IF ( pblh(i) .eq. 0. ) THEN
353	pblh(i) = 1500.
354	ENDIF
355	write(,) "debug size",size(coeffs)
356	call coare_cp(sqrt(zdu2),t1(i)-tsurf(i),q1(i)-qsurf(i),&
357	t1(i),q1(i),&
358	zgeop1(i)/RG,zgeop1(i)/RG,zgeop1(i)/RG,&
359	psol(i), pblh(i),&
360	nit_bulk,&
361	coeffs,z_0m,z_0h)
362	cdmm(i) = coeffs(1)
363	cdhh(i) = coeffs(3)
364	cdm(i)=cdmm(i)
365	cdh(i)=cdhh(i)
366	write(,) "coare cd ch",cdmm(i),cdhh(i)
367	ELSE
368	!------------------ Pour La param LMDZ (ocean) --------------------
369	zri(i) = zgeop1(i)(ztvd-ztsolv)/(zdu2ztvd)
370	IF (iri_in.EQ.1) THEN
371	zri(i) = ri_in(i)
372	ENDIF
373	ENDIF
374
375
376	!----------------------- Rajout des itérations --------------
377	DO k=1,nit_bulk
378
379	! Coefficients CD neutres : k^2/ln(z/z0) et k^2/(ln(z/z0)*ln(z/z0h)):
380	!********************************************************************
381	zzzcd=CKAP/LOG(1.+zgeop1(i)/(RG*rugos_itm(i,2)))
382	cdmn(i) = zzzcd*zzzcd
383	cdhn(i) = zzzcd(CKAP/LOG(1.+zgeop1(i)/(RGrugos_ith(i,2))))
384
385	! Calcul des fonctions de stabilite FMs, FHs, FMi, FHi :
386	!*******************************************************
387	IF (zri(i) .LT. 0.) THEN
388	SELECT CASE (iflag_corr_insta)
389	CASE (1) ! Louis 1979 + Mascart 1995
390	MU=LOG(MAX(z0m(i)/z0h(i),0.01))
391	CMstar=6.8741+2.6933MU-0.3601(MU*2)+0.0154(MU**3)
392	PM=0.5233-0.0815MU+0.0135(MU*2)-0.001(MU**3)
393	CHstar=3.2165+4.3431MU+0.536(MU*2)-0.0781(MU**3)
394	PH=0.5802-0.1571MU+0.0327(MU*2)-0.0026(MU**3)
395	CH=CHstarBCKAP/LOG(z0m(i)+zgeop1(i)/(RG*z0m(i))) &
396	& * CKAPT/LOG(z0h(i)+zgeop1(i)/(RG*z0h(i))) &
397	& * ((zgeop1(i)/(RGz0h(i)))*PH)
398	CM=CMstarBCKAP/LOG(z0m(i)+zgeop1(i)/(RG*z0m(i))) &
399	& CKAP/LOG(z0m(i)+zgeop1(i)/(RGz0m(i))) &
400	& * ((zgeop1(i)/(RGz0m(i)))*PM)
401	FM(i)=1.-Bzri(i)/(1.+CMSQRT(ABS(zri(i))))
402	FH(i)=1.-Bzri(i)/(1.+CHSQRT(ABS(zri(i))))
403	CASE (2) ! Louis 1982
404	zucf = 1./(1.+3.0CBCCcdmn(i)SQRT(ABS(zri(i)) &
405	(1.0+zgeop1(i)/(RGz0m(i)))))
406	FM(i) = AMAX1((1.-2.0CBzri(i)*zucf),f_ri_cd_min)
407	FH(i) = AMAX1((1.-3.0CBzri(i)*zucf),f_ri_cd_min)
408	CASE (3) ! Laurent Li
409	FM(i) = MAX(SQRT(1.0-18.0*zri(i)),f_ri_cd_min)
410	FH(i) = MAX(SQRT(1.0-18.0*zri(i)),f_ri_cd_min)
411	CASE (6) ! Consistent with turbulence scheme (in stationary case) derived in atke (2023)
412	sm(i) = 2./rpi * (cinf - cn) * atan(-zri(i)/ri0) + cn
413	prandtl(i) = -2./rpi * (pr_asym - pr_neut) * atan(zri(i)/ri1) + pr_neut
414	FM(i) = MAX((sm(i)*(3./2.) sqrt(cepsilon) * (1 - zri(i) / prandtl(i))**(1./2.)),f_ri_cd_min)
415	FH(i) = MAX((FM(i) / prandtl(i)), f_ri_cd_min)
416	CASE default ! Louis 1982
417	zucf = 1./(1.+3.0CBCCcdmn(i)SQRT(ABS(zri(i)) &
418	(1.0+zgeop1(i)/(RGz0m(i)))))
419	FM(i) = AMAX1((1.-2.0CBzri(i)*zucf),f_ri_cd_min)
420	FH(i) = AMAX1((1.-3.0CBzri(i)*zucf),f_ri_cd_min)
421	END SELECT
422	! Calcul des drags
423	cdmm(i)=cdmn(i)*FM(i)
424	cdhh(i)=f_cdrag_tercdhn(i)FH(i)
425	! Traitement particulier des cas oceaniques
426	! on applique Miller et al 1992 en l'absence de gustiness
427	IF (nsrf == is_oce) THEN
428	! cdh(i)=f_cdrag_ocecdhn(i)FH(i)
429	IF (iflag_gusts==0) THEN
430	zcr = (0.0016/(cdmn(i)SQRT(zdu2)))ABS(ztvd-ztsolv)**(1./3.)
431	cdhh(i) =f_cdrag_oce* cdhn(i)(1.0+zcr1.25)*(1./1.25)
432	ENDIF
433	cdmm(i)=MIN(cdmm(i),cdmmax)
434	cdhh(i)=MIN(cdhh(i),cdhmax)
435	! write(,) "LMDZ cd ch",cdmm(i),cdhh(i)
436	END IF
437	ELSE
438
439	!'''''''''''''''
440	! Cas stables :
441	!'''''''''''''''
442	zri(i) = MIN(20.,zri(i))
443	SELECT CASE (iflag_corr_sta)
444	CASE (1) ! Louis 1979 + Mascart 1995
445	FM(i)=MAX(1./((1+BPRIMEzri(i))*2),f_ri_cd_min)
446	FH(i)=FM(i)
447	CASE (2) ! Louis 1982
448	zscf = SQRT(1.+CD*ABS(zri(i)))
449	FM(i)= AMAX1(1. / (1.+2.CBzri(i)/zscf), f_ri_cd_min)
450	FH(i)= AMAX1(1./ (1.+3.CBzri(i)*zscf), f_ri_cd_min )
451	CASE (3) ! Laurent Li
452	FM(i)=MAX(1.0 / (1.0+10.0zri(i)(1+8.0*zri(i))),f_ri_cd_min)
453	FH(i)=FM(i)
454	CASE (4) ! King 2001
455	IF (zri(i) .LT. C2/2.) THEN
456	FM(i)=MAX((1.-zri(i)/C2)**2,f_ri_cd_min)
457	FH(i)= FM(i)
458	ELSE
459	FM(i)=MAX(C3((C2/zri(i))*2),f_ri_cd_min)
460	FH(i)= FM(i)
461	ENDIF
462	CASE (5) ! MO
463	if (zri(i) .LT. 1./alpha) then
464	FM(i)=MAX((1.-alphazri(i))*2,f_ri_cd_min)
465	FH(i)=FM(i)
466	else
467	FM(i)=MAX(1E-7,f_ri_cd_min)
468	FH(i)=FM(i)
469	endif
470	CASE (6) ! Consistent with turbulence scheme (in stationary case) derived in atke (2023)
471	sm(i) = MAX(0.,cn*(1.-zri(i)/ric))
472	prandtl(i) = pr_neut + zri(i) * pr_slope
473	FM(i) = MAX((sm(i)*(3./2.) sqrt(cepsilon) * (1 - zri(i) / prandtl(i))**(1./2.)),f_ri_cd_min)
474	FH(i) = MAX((FM(i) / prandtl(i)), f_ri_cd_min)
475	CASE default ! Louis 1982
476	zscf = SQRT(1.+CD*ABS(zri(i)))
477	FM(i)= AMAX1(1. / (1.+2.CBzri(i)/zscf), f_ri_cd_min)
478	FH(i)= AMAX1(1./ (1.+3.CBzri(i)*zscf), f_ri_cd_min )
479	END SELECT
480
481	! Calcul des drags
482
483	cdmm(i)=cdmn(i)*FM(i)
484	cdhh(i)=f_cdrag_tercdhn(i)FH(i)
485	IF (choix_bulk == 0) THEN
486	cdm(i)=cdmn(i)*FM(i)
487	cdh(i)=f_cdrag_tercdhn(i)FH(i)
488	ENDIF
489
490	IF (nsrf.EQ.is_oce) THEN
491	cdhh(i)=f_cdrag_ocecdhn(i)FH(i)
492	cdmm(i)=MIN(cdm(i),cdmmax)
493	cdhh(i)=MIN(cdh(i),cdhmax)
494	ENDIF
495	IF (ok_cdrag_iter) THEN
496	rugos_itm(i,1) = rugos_itm(i,2)
497	rugos_ith(i,1) = rugos_ith(i,2)
498	rugos_itm(i,2) = 0.018cdmm(i) (speed(i))/RG &
499	+ 0.1114e-6 / SQRT(cdmm(i) zdu2)
500
501	!---------- Version SEPARATION DES Z0 ----------------------
502	IF (iflag_z0_oce==0) THEN
503	rugos_ith(i,2) = rugos_itm(i,2)
504	ELSE IF (iflag_z0_oce==1) THEN
505	rugos_ith(i,2) = 0.4014e-6 / SQRT(cdmm(i) zdu2)
506	ENDIF
507	ENDIF
508	ENDIF
509	IF (ok_cdrag_iter) THEN
510	rugos_itm(i,2) = MAX(1.5e-05,rugos_itm(i,2))
511	rugos_ith(i,2) = MAX(1.5e-05,rugos_ith(i,2))
512	ENDIF
513	ENDDO
514	IF (nsrf.EQ.is_oce) THEN
515	cdm(i)=MIN(cdmm(i),cdmmax)
516	cdh(i)=MIN(cdhh(i),cdhmax)
517	ENDIF
518	z0m = rugos_itm(:,2)
519	z0h = rugos_ith(:,2)
520	ELSE ! (nsrf == is_oce)
521	zri(i) = zgeop1(i)(ztvd-ztsolv)/(zdu2ztvd)
522	IF (iri_in.EQ.1) THEN
523	zri(i) = ri_in(i)
524	ENDIF
525
526	! Coefficients CD neutres : k^2/ln(z/z0) et k^2/(ln(z/z0)*ln(z/z0h)):
527	!********************************************************************
528	zzzcd=CKAP/LOG(1.+zgeop1(i)/(RG*z0m(i)))
529	cdmn(i) = zzzcd*zzzcd
530	cdhn(i) = zzzcd(CKAP/LOG(1.+zgeop1(i)/(RGz0h(i))))
531
532
533	! Calcul des fonctions de stabilit?? FMs, FHs, FMi, FHi :
534	!*******************************************************
535	!''''''''''''''
536	! Cas instables
537	!''''''''''''''
538	IF (zri(i) .LT. 0.) THEN
539	SELECT CASE (iflag_corr_insta)
540	CASE (1) ! Louis 1979 + Mascart 1995
541	MU=LOG(MAX(z0m(i)/z0h(i),0.01))
542	CMstar=6.8741+2.6933MU-0.3601(MU*2)+0.0154(MU**3)
543	PM=0.5233-0.0815MU+0.0135(MU*2)-0.001(MU**3)
544	CHstar=3.2165+4.3431MU+0.536(MU*2)-0.0781(MU**3)
545	PH=0.5802-0.1571MU+0.0327(MU*2)-0.0026(MU**3)
546	CH=CHstarBCKAP/LOG(z0m(i)+zgeop1(i)/(RG*z0m(i))) &
547	& * CKAPT/LOG(z0h(i)+zgeop1(i)/(RG*z0h(i))) &
548	& * ((zgeop1(i)/(RGz0h(i)))*PH)
549	CM=CMstarBCKAP/LOG(z0m(i)+zgeop1(i)/(RG*z0m(i))) &
550	& CKAP/LOG(z0m(i)+zgeop1(i)/(RGz0m(i))) &
551	& * ((zgeop1(i)/(RGz0m(i)))*PM)
552	FM(i)=1.-Bzri(i)/(1.+CMSQRT(ABS(zri(i))))
553	FH(i)=1.-Bzri(i)/(1.+CHSQRT(ABS(zri(i))))
554	CASE (2) ! Louis 1982
555	zucf = 1./(1.+3.0CBCCcdmn(i)SQRT(ABS(zri(i)) &
556	(1.0+zgeop1(i)/(RGz0m(i)))))
557	FM(i) = AMAX1((1.-2.0CBzri(i)*zucf),f_ri_cd_min)
558	FH(i) = AMAX1((1.-3.0CBzri(i)*zucf),f_ri_cd_min)
559	CASE (3) ! Laurent Li
560	FM(i) = MAX(SQRT(1.0-18.0*zri(i)),f_ri_cd_min)
561	FH(i) = MAX(SQRT(1.0-18.0*zri(i)),f_ri_cd_min)
562	CASE (6) ! Consistent with turbulence scheme (in stationary case) derived in atke (2023)
563	sm(i) = 2./rpi * (cinf - cn) * atan(-zri(i)/ri0) + cn
564	prandtl(i) = -2./rpi * (pr_asym - pr_neut) * atan(zri(i)/ri1) + pr_neut
565	FM(i) = MAX((sm(i)*(3./2.) sqrt(cepsilon) * (1 - zri(i) / prandtl(i))**(1./2.)),f_ri_cd_min)
566	FH(i) = MAX((FM(i) / prandtl(i)), f_ri_cd_min)
567	CASE default ! Louis 1982
568	zucf = 1./(1.+3.0CBCCcdmn(i)SQRT(ABS(zri(i)) &
569	(1.0+zgeop1(i)/(RGz0m(i)))))
570	FM(i) = AMAX1((1.-2.0CBzri(i)*zucf),f_ri_cd_min)
571	FH(i) = AMAX1((1.-3.0CBzri(i)*zucf),f_ri_cd_min)
572	END SELECT
573	! Calcul des drags
574	cdm(i)=cdmn(i)*FM(i)
575	cdh(i)=f_cdrag_tercdhn(i)FH(i)
576	ELSE
577	!'''''''''''''''
578	! Cas stables :
579	!'''''''''''''''
580	zri(i) = MIN(20.,zri(i))
581	SELECT CASE (iflag_corr_sta)
582	CASE (1) ! Louis 1979 + Mascart 1995
583	FM(i)=MAX(1./((1+BPRIMEzri(i))*2),f_ri_cd_min)
584	FH(i)=FM(i)
585	CASE (2) ! Louis 1982
586	zscf = SQRT(1.+CD*ABS(zri(i)))
587	FM(i)= AMAX1(1. / (1.+2.CBzri(i)/zscf), f_ri_cd_min)
588	FH(i)= AMAX1(1./ (1.+3.CBzri(i)*zscf), f_ri_cd_min )
589	CASE (3) ! Laurent Li
590	FM(i)=MAX(1.0 / (1.0+10.0zri(i)(1+8.0*zri(i))),f_ri_cd_min)
591	FH(i)=FM(i)
592	CASE (4) ! King 2001
593	if (zri(i) .LT. C2/2.) then
594	FM(i)=MAX((1.-zri(i)/C2)**2,f_ri_cd_min)
595	FH(i)= FM(i)
596	else
597	FM(i)=MAX(C3((C2/zri(i))*2),f_ri_cd_min)
598	FH(i)= FM(i)
599	endif
600	CASE (5) ! MO
601	if (zri(i) .LT. 1./alpha) then
602	FM(i)=MAX((1.-alphazri(i))*2,f_ri_cd_min)
603	FH(i)=FM(i)
604	else
605	FM(i)=MAX(1E-7,f_ri_cd_min)
606	FH(i)=FM(i)
607	endif
608	CASE (6) ! Consistent with turbulence scheme (in stationary case) derived in atke (2023)
609	sm(i) = MAX(0.,cn*(1.-zri(i)/ric))
610	prandtl(i) = pr_neut + zri(i) * pr_slope
611	FM(i) = MAX((sm(i)*(3./2.) sqrt(cepsilon) * (1 - zri(i) / prandtl(i))**(1./2.)),f_ri_cd_min)
612	FH(i) = MAX((FM(i) / prandtl(i)), f_ri_cd_min)
613	CASE default ! Louis 1982
614	zscf = SQRT(1.+CD*ABS(zri(i)))
615	FM(i)= AMAX1(1. / (1.+2.CBzri(i)/zscf), f_ri_cd_min)
616	FH(i)= AMAX1(1./ (1.+3.CBzri(i)*zscf), f_ri_cd_min )
617	END SELECT
618	! Calcul des drags
619	cdm(i)=cdmn(i)*FM(i)
620	cdh(i)=f_cdrag_tercdhn(i)FH(i)
621	ENDIF
622	ENDIF ! fin du if (nsrf == is_oce)
623	END DO ! Fin de la boucle sur l'horizontal
624
625	END SUBROUTINE cdrag
626
627	END MODULE cdrag_mod

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