| 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 |
62 |
! Objet : calcul des cdrags pour le moment (pcfm) et les flux de |
| 13 |
|
|
! chaleur sensible et latente (pcfh). |
| 14 |
guez |
271 |
! Calculer le frottement au sol (drag coefficient) |
| 15 |
guez |
40 |
|
| 16 |
guez |
221 |
USE indicesol, ONLY: is_oce |
| 17 |
guez |
248 |
use nr_util, only: assert_eq |
| 18 |
guez |
221 |
USE suphec_m, ONLY: rcpd, retv, rg |
| 19 |
|
|
USE yoethf_m, ONLY: rvtmp2 |
| 20 |
|
|
|
| 21 |
|
|
INTEGER, intent(in):: nsrf ! indice pour le type de surface |
| 22 |
|
|
|
| 23 |
guez |
271 |
REAL, intent(in):: speed(:) ! (knon) |
| 24 |
|
|
! norm of the wind at the first model layer |
| 25 |
guez |
40 |
|
| 26 |
guez |
248 |
REAL, intent(in):: t(:) ! (knon) |
| 27 |
|
|
! temperature de l'air au 1er niveau du modele |
| 28 |
|
|
|
| 29 |
|
|
REAL, intent(in):: q(:) ! (knon) ! humidite de l'air au 1er niveau du modele |
| 30 |
|
|
REAL, intent(in):: zgeop(:) ! (knon) géopotentiel au 1er niveau du modèle |
| 31 |
guez |
272 |
REAL, intent(in) :: psol(:) ! (knon) pression au sol |
| 32 |
guez |
221 |
REAL, intent(in):: ts(:) ! (knon) temperature de l'air a la surface |
| 33 |
|
|
REAL, intent(in):: qsurf(:) ! (knon) humidite de l'air a la surface |
| 34 |
guez |
248 |
REAL, intent(in):: rugos(:) ! (knon) rugosit\'e |
| 35 |
guez |
271 |
REAL, intent(out):: pcfm(:) ! (knon) drag coefficient pour le moment |
| 36 |
guez |
221 |
|
| 37 |
guez |
248 |
REAL, intent(out):: pcfh(:) ! (knon) |
| 38 |
guez |
271 |
! drag coefficient pour les flux de chaleur latente et sensible |
| 39 |
guez |
47 |
|
| 40 |
guez |
272 |
REAL, intent(out), optional:: pref(:) ! (knon) pression au niveau zgeop/RG |
| 41 |
|
|
|
| 42 |
guez |
221 |
! Local: |
| 43 |
guez |
47 |
|
| 44 |
guez |
62 |
! Quelques constantes et options: |
| 45 |
guez |
248 |
REAL, PARAMETER:: ckap=0.40, cb=5.0, cc=5.0, cd=5.0, cepdu2=0.1**2 |
| 46 |
guez |
40 |
|
| 47 |
guez |
248 |
INTEGER:: i, knon |
| 48 |
guez |
221 |
REAL:: zdu2, ztsolv, ztvd, zscf |
| 49 |
|
|
REAL:: zucf, zcr |
| 50 |
|
|
REAL:: friv, frih |
| 51 |
guez |
271 |
REAL, dimension(size(speed)):: zcfm1, zcfm2 |
| 52 |
|
|
REAL, dimension(size(speed)):: zcfh1, zcfh2 |
| 53 |
|
|
REAL, dimension(size(speed)):: zcdn |
| 54 |
|
|
REAL, dimension(size(speed)):: zri |
| 55 |
guez |
40 |
|
| 56 |
guez |
62 |
!-------------------------------------------------------------------- |
| 57 |
guez |
40 |
|
| 58 |
guez |
271 |
knon = assert_eq([size(speed), size(t), size(q), size(zgeop), size(ts), & |
| 59 |
|
|
size(qsurf), size(rugos), size(pcfm), size(pcfh), size(pcfm)], & |
| 60 |
|
|
"clcdrag knon") |
| 61 |
guez |
248 |
|
| 62 |
|
|
DO i = 1, knon |
| 63 |
guez |
271 |
zdu2 = max(cepdu2,speed(i)**2) |
| 64 |
guez |
62 |
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 |
guez |
221 |
zscf = SQRT(1.+cd*ABS(zri(i))) |
| 74 |
|
|
FRIV = AMAX1(1. / (1.+2.*CB*zri(i)/ZSCF), 0.1) |
| 75 |
|
|
zcfm1(i) = zcdn(i) * FRIV |
| 76 |
|
|
FRIH = AMAX1(1./ (1.+3.*CB*zri(i)*ZSCF), 0.1 ) |
| 77 |
|
|
zcfh1(i) = 0.8 * zcdn(i) * FRIH |
| 78 |
|
|
pcfm(i) = zcfm1(i) |
| 79 |
|
|
pcfh(i) = zcfh1(i) |
| 80 |
guez |
62 |
ELSE |
| 81 |
|
|
! situation instable |
| 82 |
guez |
221 |
zucf = 1./(1.+3.0*cb*cc*zcdn(i)*SQRT(ABS(zri(i)) & |
| 83 |
|
|
*(1.0+zgeop(i)/(RG*rugos(i))))) |
| 84 |
|
|
zcfm2(i) = zcdn(i)*amax1((1.-2.0*cb*zri(i)*zucf),0.1) |
| 85 |
|
|
zcfh2(i) = 0.8 * zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),0.1) |
| 86 |
|
|
pcfm(i) = zcfm2(i) |
| 87 |
|
|
pcfh(i) = zcfh2(i) |
| 88 |
guez |
62 |
zcr = (0.0016/(zcdn(i)*SQRT(zdu2)))*ABS(ztvd-ztsolv)**(1./3.) |
| 89 |
|
|
IF(nsrf == is_oce) pcfh(i) = 0.8 * zcdn(i) & |
| 90 |
|
|
* (1. + zcr**1.25)**(1. / 1.25) |
| 91 |
|
|
ENDIF |
| 92 |
|
|
END DO |
| 93 |
|
|
|
| 94 |
|
|
END SUBROUTINE clcdrag |
| 95 |
|
|
|
| 96 |
|
|
end module clcdrag_m |
Parent Directory
| 
Revision Log