| 1 |
guez |
40 |
SUBROUTINE clcdrag(klon, knon, nsrf, zxli, u, v, t, q, zgeop, ts, qsurf, & |
| 2 |
|
|
rugos, pcfm, pcfh) |
| 3 |
|
|
|
| 4 |
|
|
! From LMDZ4/libf/phylmd/clcdrag.F90, version 1.1.1.1 2004/05/19 12:53:07 |
| 5 |
|
|
|
| 6 |
|
|
use indicesol |
| 7 |
|
|
use SUPHEC_M |
| 8 |
|
|
use yoethf_m |
| 9 |
|
|
|
| 10 |
|
|
IMPLICIT NONE |
| 11 |
|
|
|
| 12 |
|
|
! Objet : calcul des cdrags pour le moment (pcfm) et les flux de |
| 13 |
|
|
! chaleur sensible et latente (pcfh). |
| 14 |
|
|
|
| 15 |
|
|
! knon----input-I- nombre de points pour un type de surface |
| 16 |
|
|
! nsrf----input-I- indice pour le type de surface; voir indicesol.inc |
| 17 |
|
|
! zxli----input-L- calcul des cdrags selon Laurent Li |
| 18 |
|
|
! u-------input-R- vent zonal au 1er niveau du modele |
| 19 |
|
|
! v-------input-R- vent meridien au 1er niveau du modele |
| 20 |
|
|
! t-------input-R- temperature de l'air au 1er niveau du modele |
| 21 |
|
|
! q-------input-R- humidite de l'air au 1er niveau du modele |
| 22 |
|
|
! ts------input-R- temperature de l'air a la surface |
| 23 |
|
|
! qsurf---input-R- humidite de l'air a la surface |
| 24 |
|
|
! rugos---input-R- rugosite |
| 25 |
|
|
|
| 26 |
|
|
! pcfm---output-R- cdrag pour le moment |
| 27 |
|
|
! pcfh---output-R- cdrag pour les flux de chaleur latente et sensible |
| 28 |
|
|
|
| 29 |
|
|
INTEGER, intent(in) :: klon |
| 30 |
|
|
! dimension de la grille physique (= nb_pts_latitude X nb_pts_longitude) |
| 31 |
|
|
|
| 32 |
|
|
INTEGER, intent(in) :: knon, nsrf |
| 33 |
|
|
LOGICAL, intent(in) :: zxli |
| 34 |
|
|
REAL, intent(in), dimension(klon) :: u, v, t, q |
| 35 |
|
|
REAL, intent(in):: zgeop(klon) ! géopotentiel au 1er niveau du modèle |
| 36 |
|
|
REAL, intent(in), dimension(klon) :: ts, qsurf |
| 37 |
|
|
REAL, intent(in), dimension(klon) :: rugos |
| 38 |
|
|
REAL, intent(out), dimension(klon) :: pcfm, pcfh |
| 39 |
|
|
|
| 40 |
|
|
! Quelques constantes et options: |
| 41 |
|
|
REAL, PARAMETER :: ckap=0.40, cb=5.0, cc=5.0, cd=5.0, cepdu2=(0.1)**2 |
| 42 |
|
|
|
| 43 |
|
|
! Variables locales : |
| 44 |
|
|
INTEGER :: i |
| 45 |
|
|
REAL :: zdu2, ztsolv, ztvd, zscf |
| 46 |
|
|
REAL :: zucf, zcr |
| 47 |
|
|
REAL :: friv, frih |
| 48 |
|
|
REAL, dimension(klon) :: zcfm1, zcfm2 |
| 49 |
|
|
REAL, dimension(klon) :: zcfh1, zcfh2 |
| 50 |
|
|
REAL, dimension(klon) :: zcdn |
| 51 |
|
|
REAL, dimension(klon) :: zri |
| 52 |
|
|
|
| 53 |
|
|
! Fonctions thermodynamiques et fonctions d'instabilite |
| 54 |
|
|
REAL :: fsta, fins, x |
| 55 |
|
|
fsta(x) = 1.0 / (1.0+10.0*x*(1+8.0*x)) |
| 56 |
|
|
fins(x) = SQRT(1.0-18.0*x) |
| 57 |
|
|
|
| 58 |
|
|
!-------------------------------------------------------------------- |
| 59 |
|
|
|
| 60 |
|
|
! Calculer le frottement au sol (Cdrag) |
| 61 |
|
|
|
| 62 |
|
|
DO i = 1, knon |
| 63 |
|
|
zdu2 = max(cepdu2,u(i)**2+v(i)**2) |
| 64 |
|
|
ztsolv = ts(i) * (1.0+RETV*qsurf(i)) |
| 65 |
|
|
ztvd = (t(i)+zgeop(i)/RCPD/(1.+RVTMP2*q(i))) & |
| 66 |
|
|
*(1.+RETV*q(i)) |
| 67 |
|
|
zri(i) = zgeop(i)*(ztvd-ztsolv)/(zdu2*ztvd) |
| 68 |
|
|
zcdn(i) = (ckap/log(1.+zgeop(i)/(RG*rugos(i))))**2 |
| 69 |
|
|
|
| 70 |
|
|
IF (zri(i) .gt. 0.) THEN |
| 71 |
|
|
! situation stable |
| 72 |
|
|
zri(i) = min(20.,zri(i)) |
| 73 |
|
|
IF (.NOT.zxli) THEN |
| 74 |
|
|
zscf = SQRT(1.+cd*ABS(zri(i))) |
| 75 |
|
|
FRIV = AMAX1(1. / (1.+2.*CB*zri(i)/ZSCF), 0.1) |
| 76 |
|
|
zcfm1(i) = zcdn(i) * FRIV |
| 77 |
|
|
FRIH = AMAX1(1./ (1.+3.*CB*zri(i)*ZSCF), 0.1 ) |
| 78 |
|
|
zcfh1(i) = 0.8 * zcdn(i) * FRIH |
| 79 |
|
|
pcfm(i) = zcfm1(i) |
| 80 |
|
|
pcfh(i) = zcfh1(i) |
| 81 |
|
|
ELSE |
| 82 |
|
|
pcfm(i) = zcdn(i)* fsta(zri(i)) |
| 83 |
|
|
pcfh(i) = zcdn(i)* fsta(zri(i)) |
| 84 |
guez |
3 |
ENDIF |
| 85 |
guez |
40 |
ELSE |
| 86 |
|
|
! situation instable |
| 87 |
|
|
IF (.NOT.zxli) THEN |
| 88 |
|
|
zucf = 1./(1.+3.0*cb*cc*zcdn(i)*SQRT(ABS(zri(i)) & |
| 89 |
|
|
*(1.0+zgeop(i)/(RG*rugos(i))))) |
| 90 |
|
|
zcfm2(i) = zcdn(i)*amax1((1.-2.0*cb*zri(i)*zucf),0.1) |
| 91 |
|
|
zcfh2(i) = 0.8 * zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),0.1) |
| 92 |
|
|
pcfm(i) = zcfm2(i) |
| 93 |
|
|
pcfh(i) = zcfh2(i) |
| 94 |
|
|
ELSE |
| 95 |
|
|
pcfm(i) = zcdn(i)* fins(zri(i)) |
| 96 |
|
|
pcfh(i) = zcdn(i)* fins(zri(i)) |
| 97 |
|
|
ENDIF |
| 98 |
|
|
zcr = (0.0016/(zcdn(i)*SQRT(zdu2)))*ABS(ztvd-ztsolv)**(1./3.) |
| 99 |
|
|
IF(nsrf == is_oce) pcfh(i) = 0.8 * zcdn(i) & |
| 100 |
|
|
* (1. + zcr**1.25)**(1. / 1.25) |
| 101 |
|
|
ENDIF |
| 102 |
|
|
END DO |
| 103 |
|
|
|
| 104 |
|
|
END SUBROUTINE clcdrag |
Parent Directory
| 
Revision Log