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! |
module cdrag_m |
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! $Header: /home/cvsroot/LMDZ4/libf/phylmd/clcdrag.F90,v 1.1.1.1 2004/05/19 12:53:07 lmdzadmin Exp $ |
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! |
IMPLICIT NONE |
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SUBROUTINE clcdrag(klon, knon, nsrf, zxli, & |
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u, v, t, q, zgeop, & |
contains |
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ts, qsurf, rugos, & |
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pcfm, pcfh) |
SUBROUTINE cdrag(nsrf, speed, t, q, zgeop, psol, ts, qsurf, rugos, pcfm, & |
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use indicesol |
pcfh, pref) |
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use SUPHEC_M |
|
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use yoethf_m |
! From LMDZ4/libf/phylmd/clcdrag.F90 and |
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IMPLICIT NONE |
! LMDZ4/libf/phylmd/coefcdrag.F90, version 1.1.1.1, 2004/05/19 |
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! ================================================================= c |
! 12:53:07 |
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! |
|
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! Objet : calcul des cdrags pour le moment (pcfm) et |
! Objet : calcul des drag coefficients au sol pour le moment et |
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! les flux de chaleur sensible et latente (pcfh). |
! les flux de chaleur sensible et latente et calcul de la pression |
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! |
! au niveau de reference. |
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! ================================================================= c |
|
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! |
! I. Musat, 01 Jul 2002 |
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! klon----input-I- dimension de la grille physique (= nb_pts_latitude X nb_pts_longitude) |
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! knon----input-I- nombre de points pour un type de surface |
use clesphys, only: f_cdrag_oce, f_cdrag_ter |
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! nsrf----input-I- indice pour le type de surface; voir indicesol.inc |
use indicesol, only: is_oce |
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! zxli----input-L- calcul des cdrags selon Laurent Li |
use nr_util, only: assert_eq |
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! u-------input-R- vent zonal au 1er niveau du modele |
use SUPHEC_M, only: rcpd, rd, retv, rg |
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! v-------input-R- vent meridien au 1er niveau du modele |
USE yoethf_m, ONLY: rvtmp2 |
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! t-------input-R- temperature de l'air au 1er niveau du modele |
|
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! q-------input-R- humidite de l'air au 1er niveau du modele |
INTEGER, intent(in):: nsrf ! indice pour le type de surface |
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! zgeop---input-R- geopotentiel au 1er niveau du modele |
|
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! ts------input-R- temperature de l'air a la surface |
REAL, intent(in):: speed(:) ! (knon) |
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! qsurf---input-R- humidite de l'air a la surface |
! norm of the wind at the first model level |
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! rugos---input-R- rugosite |
|
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! |
REAL, intent(in):: t(:) ! (knon) |
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! pcfm---output-R- cdrag pour le moment |
! temperature de l'air au 1er niveau du modele |
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! pcfh---output-R- cdrag pour les flux de chaleur latente et sensible |
|
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! |
REAL, intent(in):: q(:) ! (knon) ! humidite de l'air au 1er niveau du modele |
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INTEGER, intent(in) :: klon, knon, nsrf |
|
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LOGICAL, intent(in) :: zxli |
REAL, intent(in):: zgeop(:) ! (knon) |
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REAL, intent(in), dimension(klon) :: u, v, t, q, zgeop |
! g\'eopotentiel au 1er niveau du mod\`ele |
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REAL, intent(in), dimension(klon) :: ts, qsurf |
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REAL, intent(in), dimension(klon) :: rugos |
REAL, intent(in) :: psol(:) ! (knon) pression au sol |
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REAL, intent(out), dimension(klon) :: pcfm, pcfh |
REAL, intent(in):: ts(:) ! (knon) temperature de l'air a la surface |
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! ================================================================= c |
REAL, intent(in):: qsurf(:) ! (knon) humidite de l'air a la surface |
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! |
REAL, intent(in):: rugos(:) ! (knon) rugosit\'e |
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! |
REAL, intent(out):: pcfm(:) ! (knon) drag coefficient pour le moment |
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! Quelques constantes et options: |
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!!$PB REAL, PARAMETER :: ckap=0.35, cb=5.0, cc=5.0, cd=5.0, cepdu2=(0.1)**2 |
REAL, intent(out):: pcfh(:) ! (knon) |
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REAL, PARAMETER :: ckap=0.40, cb=5.0, cc=5.0, cd=5.0, cepdu2=(0.1)**2 |
! drag coefficient pour les flux de chaleur latente et sensible |
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! |
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! Variables locales : |
REAL, intent(out), optional:: pref(:) ! (knon) pression au niveau zgeop/RG |
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INTEGER :: i |
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REAL :: zdu2, ztsolv, ztvd, zscf |
! Local: |
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REAL :: zucf, zcr |
REAL, PARAMETER:: ckap=0.40, cb=5.0, cc=5.0, cd=5.0, cepdu2=0.1**2 |
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REAL :: friv, frih |
INTEGER i, knon |
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REAL, dimension(klon) :: zcfm1, zcfm2 |
REAL zdu2, ztsolv, ztvd, zscf, zucf, zcr, friv, frih |
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REAL, dimension(klon) :: zcfh1, zcfh2 |
REAL zcfm1, zcfh1, zcfm2, zcfh2 |
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REAL, dimension(klon) :: zcdn |
real zcdn ! drag coefficient neutre |
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REAL, dimension(klon) :: zri |
|
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! |
REAL zri |
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! Fonctions thermodynamiques et fonctions d'instabilite |
! nb. Richardson entre la surface et la couche zgeop/RG |
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REAL :: fsta, fins, x |
! nombre de Richardson entre la surface et le niveau de reference (zri) |
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fsta(x) = 1.0 / (1.0+10.0*x*(1+8.0*x)) |
|
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fins(x) = SQRT(1.0-18.0*x) |
!------------------------------------------------------------------------- |
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! ================================================================= c |
|
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! |
knon = assert_eq([size(speed), size(t), size(q), size(zgeop), size(ts), & |
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! Calculer le frottement au sol (Cdrag) |
size(qsurf), size(rugos), size(pcfm), size(pcfh), size(pcfm)], & |
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! |
"cdrag knon") |
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DO i = 1, knon |
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zdu2 = max(cepdu2,u(i)**2+v(i)**2) |
DO i = 1, knon |
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ztsolv = ts(i) * (1.0+RETV*qsurf(i)) |
zdu2 = max(cepdu2, speed(i)**2) |
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ztvd = (t(i)+zgeop(i)/RCPD/(1.+RVTMP2*q(i))) & |
ztsolv = ts(i) * (1. + RETV * max(qsurf(i), 0.)) |
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*(1.+RETV*q(i)) |
ztvd = (t(i)+zgeop(i)/RCPD/(1.+RVTMP2*q(i))) *(1.+RETV*q(i)) |
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zri(i) = zgeop(i)*(ztvd-ztsolv)/(zdu2*ztvd) |
zri = zgeop(i)*(ztvd-ztsolv)/(zdu2*ztvd) |
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zcdn(i) = (ckap/log(1.+zgeop(i)/(RG*rugos(i))))**2 |
zcdn = (ckap/log(1.+zgeop(i)/(RG*rugos(i))))**2 |
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! |
|
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!!$ IF (zri(i) .ge. 0.) THEN ! situation stable |
IF (zri > 0.) THEN |
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IF (zri(i) .gt. 0.) THEN ! situation stable |
! Situation stable. Pour eviter les inconsistances dans les cas |
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zri(i) = min(20.,zri(i)) |
! tres stables on limite zri a 20. cf Hess et al. (1995). |
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IF (.NOT.zxli) THEN |
zri = min(20., zri) |
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zscf = SQRT(1.+cd*ABS(zri(i))) |
zscf = SQRT(1.+cd*ABS(zri)) |
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FRIV = AMAX1(1. / (1.+2.*CB*zri(i)/ZSCF), 0.1) |
friv = max(1. / (1.+2.*CB*zri/ zscf), 0.1) |
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zcfm1(i) = zcdn(i) * FRIV |
zcfm1 = zcdn * friv |
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FRIH = AMAX1(1./ (1.+3.*CB*zri(i)*ZSCF), 0.1 ) |
frih = max(1./ (1.+3.*CB*zri*zscf), 0.1) |
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!!$ PB zcfh1(i) = zcdn(i) * FRIH |
zcfh1 = f_cdrag_ter * zcdn * frih |
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zcfh1(i) = 0.8 * zcdn(i) * FRIH |
IF (nsrf == is_oce) zcfh1 = f_cdrag_oce * zcdn * frih |
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pcfm(i) = zcfm1(i) |
pcfm(i) = zcfm1 |
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pcfh(i) = zcfh1(i) |
pcfh(i) = zcfh1 |
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ELSE |
ELSE |
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pcfm(i) = zcdn(i)* fsta(zri(i)) |
! situation instable |
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pcfh(i) = zcdn(i)* fsta(zri(i)) |
zucf = 1./(1.+3.0*cb*cc*zcdn*SQRT(ABS(zri) & |
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ENDIF |
*(1.0+zgeop(i)/(RG*rugos(i))))) |
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ELSE ! situation instable |
zcfm2 = zcdn*max((1.-2.0*cb*zri*zucf), 0.1) |
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IF (.NOT.zxli) THEN |
zcfh2 = f_cdrag_ter * zcdn*max((1.-3.0*cb*zri*zucf), 0.1) |
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zucf = 1./(1.+3.0*cb*cc*zcdn(i)*SQRT(ABS(zri(i)) & |
pcfm(i) = zcfm2 |
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*(1.0+zgeop(i)/(RG*rugos(i))))) |
pcfh(i) = zcfh2 |
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zcfm2(i) = zcdn(i)*amax1((1.-2.0*cb*zri(i)*zucf),0.1) |
|
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!!$PB zcfh2(i) = zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),0.1) |
! pcfh sur l'ocean cf. Miller et al. (1992) |
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zcfh2(i) = 0.8 * zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),0.1) |
zcr = (0.0016/(zcdn*SQRT(zdu2)))*ABS(ztvd-ztsolv)**(1./3.) |
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pcfm(i) = zcfm2(i) |
IF (nsrf == is_oce) pcfh(i) = f_cdrag_oce * zcdn & |
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pcfh(i) = zcfh2(i) |
* (1. + zcr**1.25)**(1. / 1.25) |
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ELSE |
ENDIF |
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pcfm(i) = zcdn(i)* fins(zri(i)) |
END DO |
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pcfh(i) = zcdn(i)* fins(zri(i)) |
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ENDIF |
if (present(pref)) & |
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zcr = (0.0016/(zcdn(i)*SQRT(zdu2)))*ABS(ztvd-ztsolv)**(1./3.) |
pref = exp(log(psol) - zgeop / (RD * t * (1. + RETV * max(q, 0.)))) |
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IF(nsrf.EQ.is_oce) pcfh(i) =0.8* zcdn(i)*(1.0+zcr**1.25)**(1./1.25) |
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ENDIF |
END SUBROUTINE cdrag |
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END DO |
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RETURN |
end module cdrag_m |
|
END SUBROUTINE clcdrag |
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