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guez |
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SUBROUTINE clcdrag(klon, knon, nsrf, zxli, u, v, t, q, zgeop, ts, qsurf, & |
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rugos, pcfm, pcfh) |
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! From LMDZ4/libf/phylmd/clcdrag.F90, version 1.1.1.1 2004/05/19 12:53:07 |
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use indicesol |
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use SUPHEC_M |
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use yoethf_m |
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IMPLICIT NONE |
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! Objet : calcul des cdrags pour le moment (pcfm) et les flux de |
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! chaleur sensible et latente (pcfh). |
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! knon----input-I- nombre de points pour un type de surface |
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! nsrf----input-I- indice pour le type de surface; voir indicesol.inc |
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! zxli----input-L- calcul des cdrags selon Laurent Li |
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! u-------input-R- vent zonal au 1er niveau du modele |
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! v-------input-R- vent meridien au 1er niveau du modele |
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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 |
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! ts------input-R- temperature de l'air a la surface |
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! qsurf---input-R- humidite de l'air a la surface |
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! rugos---input-R- rugosite |
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! pcfm---output-R- cdrag pour le moment |
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! pcfh---output-R- cdrag pour les flux de chaleur latente et sensible |
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INTEGER, intent(in) :: klon |
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! dimension de la grille physique (= nb_pts_latitude X nb_pts_longitude) |
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INTEGER, intent(in) :: knon, nsrf |
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! Fonctions thermodynamiques et fonctions d'instabilite |
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LOGICAL, intent(in) :: zxli ! utiliser un jeu de fonctions simples |
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REAL, intent(in), dimension(klon) :: u, v, t, q |
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REAL, intent(in):: zgeop(klon) ! géopotentiel au 1er niveau du modèle |
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REAL, intent(in), dimension(klon) :: ts, qsurf |
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REAL, intent(in), dimension(klon) :: rugos |
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REAL, intent(out), dimension(klon) :: pcfm, pcfh |
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! Quelques constantes et options: |
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REAL, PARAMETER :: ckap=0.40, cb=5.0, cc=5.0, cd=5.0, cepdu2=(0.1)**2 |
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! Variables locales : |
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INTEGER :: i |
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REAL :: zdu2, ztsolv, ztvd, zscf |
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REAL :: zucf, zcr |
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REAL :: friv, frih |
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REAL, dimension(klon) :: zcfm1, zcfm2 |
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REAL, dimension(klon) :: zcfh1, zcfh2 |
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REAL, dimension(klon) :: zcdn |
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REAL, dimension(klon) :: zri |
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!-------------------------------------------------------------------- |
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! Calculer le frottement au sol (Cdrag) |
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DO i = 1, knon |
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zdu2 = max(cepdu2,u(i)**2+v(i)**2) |
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ztsolv = ts(i) * (1.0+RETV*qsurf(i)) |
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ztvd = (t(i)+zgeop(i)/RCPD/(1.+RVTMP2*q(i))) & |
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*(1.+RETV*q(i)) |
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zri(i) = zgeop(i)*(ztvd-ztsolv)/(zdu2*ztvd) |
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zcdn(i) = (ckap/log(1.+zgeop(i)/(RG*rugos(i))))**2 |
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IF (zri(i) .gt. 0.) THEN |
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! situation stable |
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zri(i) = min(20.,zri(i)) |
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IF (.NOT. zxli) THEN |
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zscf = SQRT(1.+cd*ABS(zri(i))) |
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FRIV = AMAX1(1. / (1.+2.*CB*zri(i)/ZSCF), 0.1) |
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zcfm1(i) = zcdn(i) * FRIV |
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FRIH = AMAX1(1./ (1.+3.*CB*zri(i)*ZSCF), 0.1 ) |
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zcfh1(i) = 0.8 * zcdn(i) * FRIH |
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pcfm(i) = zcfm1(i) |
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pcfh(i) = zcfh1(i) |
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ELSE |
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pcfm(i) = zcdn(i)* fsta(zri(i)) |
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pcfh(i) = zcdn(i)* fsta(zri(i)) |
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ENDIF |
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ELSE |
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! situation instable |
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IF (.NOT. zxli) THEN |
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zucf = 1./(1.+3.0*cb*cc*zcdn(i)*SQRT(ABS(zri(i)) & |
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*(1.0+zgeop(i)/(RG*rugos(i))))) |
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zcfm2(i) = zcdn(i)*amax1((1.-2.0*cb*zri(i)*zucf),0.1) |
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zcfh2(i) = 0.8 * zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),0.1) |
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pcfm(i) = zcfm2(i) |
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pcfh(i) = zcfh2(i) |
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ELSE |
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pcfm(i) = zcdn(i)* fins(zri(i)) |
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pcfh(i) = zcdn(i)* fins(zri(i)) |
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ENDIF |
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zcr = (0.0016/(zcdn(i)*SQRT(zdu2)))*ABS(ztvd-ztsolv)**(1./3.) |
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IF(nsrf == is_oce) pcfh(i) = 0.8 * zcdn(i) & |
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* (1. + zcr**1.25)**(1. / 1.25) |
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ENDIF |
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END DO |
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guez |
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contains |
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! Fonctions thermodynamiques et fonctions d'instabilite |
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function fsta(x) |
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REAL fsta |
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real, intent(in):: x |
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fsta = 1.0 / (1.0+10.0*x*(1+8.0*x)) |
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end function fsta |
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!******************************************************* |
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function fins(x) |
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REAL fins |
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real, intent(in):: x |
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fins = SQRT(1.0-18.0*x) |
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end function fins |
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guez |
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END SUBROUTINE clcdrag |
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