1 |
guez |
62 |
module clcdrag_m |
2 |
guez |
40 |
|
3 |
guez |
62 |
IMPLICIT NONE |
4 |
guez |
40 |
|
5 |
guez |
62 |
contains |
6 |
guez |
40 |
|
7 |
guez |
272 |
SUBROUTINE clcdrag(nsrf, speed, t, q, zgeop, psol, ts, qsurf, rugos, pcfm, & |
8 |
|
|
pcfh, pref) |
9 |
guez |
40 |
|
10 |
guez |
221 |
! From LMDZ4/libf/phylmd/clcdrag.F90, version 1.1.1.1, 2004/05/19 12:53:07 |
11 |
guez |
40 |
|
12 |
guez |
274 |
! Objet : calcul des drag coefficients au sol pour le moment et |
13 |
|
|
! les flux de chaleur sensible et latente et calcul de la pression |
14 |
|
|
! au niveau de reference. |
15 |
guez |
40 |
|
16 |
guez |
274 |
! I. Musat, 01 Jul 2002 |
17 |
|
|
|
18 |
|
|
use clesphys, only: f_cdrag_oce, f_cdrag_ter |
19 |
|
|
use indicesol, only: is_oce |
20 |
guez |
248 |
use nr_util, only: assert_eq |
21 |
guez |
274 |
use SUPHEC_M, only: rcpd, rd, retv, rg |
22 |
guez |
221 |
USE yoethf_m, ONLY: rvtmp2 |
23 |
|
|
|
24 |
|
|
INTEGER, intent(in):: nsrf ! indice pour le type de surface |
25 |
|
|
|
26 |
guez |
271 |
REAL, intent(in):: speed(:) ! (knon) |
27 |
guez |
274 |
! norm of the wind at the first model level |
28 |
guez |
40 |
|
29 |
guez |
248 |
REAL, intent(in):: t(:) ! (knon) |
30 |
|
|
! temperature de l'air au 1er niveau du modele |
31 |
|
|
|
32 |
|
|
REAL, intent(in):: q(:) ! (knon) ! humidite de l'air au 1er niveau du modele |
33 |
guez |
274 |
|
34 |
|
|
REAL, intent(in):: zgeop(:) ! (knon) |
35 |
|
|
! g\'eopotentiel au 1er niveau du mod\`ele |
36 |
|
|
|
37 |
guez |
272 |
REAL, intent(in) :: psol(:) ! (knon) pression au sol |
38 |
guez |
221 |
REAL, intent(in):: ts(:) ! (knon) temperature de l'air a la surface |
39 |
|
|
REAL, intent(in):: qsurf(:) ! (knon) humidite de l'air a la surface |
40 |
guez |
248 |
REAL, intent(in):: rugos(:) ! (knon) rugosit\'e |
41 |
guez |
271 |
REAL, intent(out):: pcfm(:) ! (knon) drag coefficient pour le moment |
42 |
guez |
221 |
|
43 |
guez |
248 |
REAL, intent(out):: pcfh(:) ! (knon) |
44 |
guez |
271 |
! drag coefficient pour les flux de chaleur latente et sensible |
45 |
guez |
47 |
|
46 |
guez |
272 |
REAL, intent(out), optional:: pref(:) ! (knon) pression au niveau zgeop/RG |
47 |
|
|
|
48 |
guez |
221 |
! Local: |
49 |
guez |
248 |
REAL, PARAMETER:: ckap=0.40, cb=5.0, cc=5.0, cd=5.0, cepdu2=0.1**2 |
50 |
guez |
274 |
INTEGER i, knon |
51 |
|
|
REAL zdu2, ztsolv, ztvd, zscf, zucf, zcr, friv, frih |
52 |
|
|
REAL zcfm1, zcfh1, zcfm2, zcfh2 |
53 |
|
|
real zcdn ! drag coefficient neutre |
54 |
guez |
40 |
|
55 |
guez |
274 |
REAL zri |
56 |
|
|
! nb. Richardson entre la surface et la couche zgeop/RG |
57 |
|
|
! nombre de Richardson entre la surface et le niveau de reference (zri) |
58 |
guez |
40 |
|
59 |
guez |
274 |
!------------------------------------------------------------------------- |
60 |
guez |
40 |
|
61 |
guez |
271 |
knon = assert_eq([size(speed), size(t), size(q), size(zgeop), size(ts), & |
62 |
|
|
size(qsurf), size(rugos), size(pcfm), size(pcfh), size(pcfm)], & |
63 |
|
|
"clcdrag knon") |
64 |
guez |
248 |
|
65 |
|
|
DO i = 1, knon |
66 |
guez |
274 |
zdu2 = max(cepdu2, speed(i)**2) |
67 |
|
|
ztsolv = ts(i) * (1. + RETV * max(qsurf(i), 0.)) |
68 |
|
|
ztvd = (t(i)+zgeop(i)/RCPD/(1.+RVTMP2*q(i))) *(1.+RETV*q(i)) |
69 |
|
|
zri = zgeop(i)*(ztvd-ztsolv)/(zdu2*ztvd) |
70 |
|
|
zcdn = (ckap/log(1.+zgeop(i)/(RG*rugos(i))))**2 |
71 |
guez |
62 |
|
72 |
guez |
274 |
IF (zri > 0.) THEN |
73 |
|
|
! Situation stable. Pour eviter les inconsistances dans les cas |
74 |
|
|
! tres stables on limite zri a 20. cf Hess et al. (1995). |
75 |
|
|
zri = min(20., zri) |
76 |
|
|
zscf = SQRT(1.+cd*ABS(zri)) |
77 |
|
|
friv = max(1. / (1.+2.*CB*zri/ zscf), 0.1) |
78 |
|
|
zcfm1 = zcdn * friv |
79 |
|
|
frih = max(1./ (1.+3.*CB*zri*zscf), 0.1) |
80 |
|
|
zcfh1 = f_cdrag_ter * zcdn * frih |
81 |
|
|
IF (nsrf == is_oce) zcfh1 = f_cdrag_oce * zcdn * frih |
82 |
|
|
pcfm(i) = zcfm1 |
83 |
|
|
pcfh(i) = zcfh1 |
84 |
|
|
ELSE |
85 |
guez |
62 |
! situation instable |
86 |
guez |
274 |
zucf = 1./(1.+3.0*cb*cc*zcdn*SQRT(ABS(zri) & |
87 |
guez |
221 |
*(1.0+zgeop(i)/(RG*rugos(i))))) |
88 |
guez |
274 |
zcfm2 = zcdn*max((1.-2.0*cb*zri*zucf), 0.1) |
89 |
|
|
zcfh2 = f_cdrag_ter * zcdn*max((1.-3.0*cb*zri*zucf), 0.1) |
90 |
|
|
pcfm(i) = zcfm2 |
91 |
|
|
pcfh(i) = zcfh2 |
92 |
|
|
|
93 |
|
|
! pcfh sur l'ocean cf. Miller et al. (1992) |
94 |
|
|
zcr = (0.0016/(zcdn*SQRT(zdu2)))*ABS(ztvd-ztsolv)**(1./3.) |
95 |
|
|
IF (nsrf == is_oce) pcfh(i) = f_cdrag_oce * zcdn & |
96 |
guez |
62 |
* (1. + zcr**1.25)**(1. / 1.25) |
97 |
|
|
ENDIF |
98 |
|
|
END DO |
99 |
|
|
|
100 |
guez |
274 |
if (present(pref)) & |
101 |
|
|
pref = exp(log(psol) - zgeop / (RD * t * (1. + RETV * max(q, 0.)))) |
102 |
|
|
|
103 |
guez |
62 |
END SUBROUTINE clcdrag |
104 |
|
|
|
105 |
|
|
end module clcdrag_m |