--- trunk/phylmd/Interface_surf/calcul_fluxs.f	2018/04/19 17:54:55	266
+++ trunk/phylmd/Interface_surf/calcul_fluxs.f	2018/09/18 15:14:40	308
@@ -4,22 +4,26 @@
 
 contains
 
-  SUBROUTINE calcul_fluxs(dtime, tsurf, p1lay, cal, beta, coef1lay, ps, &
-       qsurf, radsol, dif_grnd, t1lay, q1lay, u1lay, v1lay, petAcoef, &
-       peqAcoef, petBcoef, peqBcoef, tsurf_new, evap, fluxlat, flux_t, &
-       dflux_s, dflux_l)
+  SUBROUTINE calcul_fluxs(tsurf, p1lay, cal, beta, cdragh, ps, qsurf, &
+       radsol, t1lay, q1lay, u1lay, v1lay, tAcoef, qAcoef, tBcoef, &
+       qBcoef, tsurf_new, evap, fluxlat, flux_t, dflux_s, dflux_l, dif_grnd)
 
     ! Cette routine calcule les flux en h et q à l'interface et une
     ! température de surface.
 
     ! L. Fairhead, April 2000
 
-    USE fcttre, ONLY: foede, foeew
+    ! Note that, if cal = 0, beta = 1 and dif_grnd = 0, then tsurf_new
+    ! = tsurf and qsurf = qsat.
+
+    ! Libraries:
     use nr_util, only: assert_eq
+
+    use comconst, only: dtphys
+    USE fcttre, ONLY: foede, foeew
     USE suphec_m, ONLY: rcpd, rd, retv, rlstt, rlvtt, rtt
     USE yoethf_m, ONLY: r2es, r5ies, r5les, rvtmp2
 
-    real, intent(IN):: dtime
     real, intent(IN):: tsurf(:) ! (knon) température de surface
 
     real, intent(IN):: p1lay(:) ! (knon)
@@ -27,22 +31,20 @@
 
     real, intent(IN):: cal(:) ! (knon) capacité calorifique du sol
     real, intent(IN):: beta(:) ! (knon) évaporation réelle
-    real, intent(IN):: coef1lay(:) ! (knon) coefficient d'échange
+    real, intent(IN):: cdragh(:) ! (knon) coefficient d'échange
     real, intent(IN):: ps(:) ! (knon) pression au sol
     real, intent(OUT):: qsurf(:) ! (knon) humidité de l'air au-dessus du sol
 
     real, intent(IN):: radsol(:) ! (knon)
     ! rayonnement net au sol (longwave + shortwave)
 
-    real, intent(IN):: dif_grnd(:) ! (knon)
-    ! coefficient de diffusion vers le sol profond
-
+    real, intent(IN):: dif_grnd ! coefficient de diffusion vers le sol profond
     real, intent(IN):: t1lay(:), q1lay(:), u1lay(:), v1lay(:) ! (knon)
 
-    real, intent(IN):: petAcoef(:), peqAcoef(:) ! (knon)
+    real, intent(IN):: tAcoef(:), qAcoef(:) ! (knon)
     ! coefficients A de la résolution de la couche limite pour T et q
 
-    real, intent(IN):: petBcoef(:), peqBcoef(:) ! (knon)
+    real, intent(IN):: tBcoef(:), qBcoef(:) ! (knon)
     ! coefficients B de la résolution de la couche limite pour t et q
 
     real, intent(OUT):: tsurf_new(:) ! (knon) température au sol
@@ -57,22 +59,23 @@
 
     ! Local:
     integer i
-    integer knon ! nombre de points a traiter
+    integer knon ! nombre de points \`a traiter
     real, dimension(size(ps)):: mh, oh, mq, nq, oq, dq_s_dt, coef ! (knon)
     real qsat(size(ps)) ! (knon) mass fraction
     real sl(size(ps)) ! (knon) chaleur latente d'évaporation ou de sublimation
     logical delta
     real zcor
     real, parameter:: t_grnd = 271.35
+    real, parameter:: min_wind_speed = 1. ! in m s-1
 
     !---------------------------------------------------------------------
 
-    knon = assert_eq((/size(tsurf), size(p1lay), size(cal), size(beta), &
-         size(coef1lay), size(ps), size(qsurf), size(radsol), size(dif_grnd), &
-         size(t1lay), size(q1lay), size(u1lay), size(v1lay), size(petAcoef), &
-         size(peqAcoef), size(petBcoef), size(peqBcoef), size(tsurf_new), &
-         size(evap), size(fluxlat), size(flux_t), size(dflux_s), &
-         size(dflux_l)/), "calcul_fluxs knon")
+    knon = assert_eq([size(tsurf), size(p1lay), size(cal), size(beta), &
+         size(cdragh), size(ps), size(qsurf), size(radsol), size(t1lay), &
+         size(q1lay), size(u1lay), size(v1lay), size(tAcoef), size(qAcoef), &
+         size(tBcoef), size(qBcoef), size(tsurf_new), size(evap), &
+         size(fluxlat), size(flux_t), size(dflux_s), size(dflux_l)], &
+         "calcul_fluxs knon")
 
     ! Traitement de l'humidité du sol
 
@@ -86,31 +89,28 @@
             qsat(i), zcor) / RLVTT
     ENDDO
 
-    coef = coef1lay * (1. + SQRT(u1lay**2 + v1lay**2)) * p1lay / (RD * t1lay)
+    coef = cdragh * (min_wind_speed + SQRT(u1lay**2 + v1lay**2)) * p1lay &
+         / (RD * t1lay)
     sl = merge(RLSTT, RLVTT, tsurf < RTT)
 
     ! Q
-    oq = 1. - beta * coef * peqBcoef * dtime
-    mq = beta * coef * (peqAcoef - qsat + dq_s_dt * tsurf) / oq
-    nq = beta * coef * (- 1. * dq_s_dt) / oq
+    oq = 1. - beta * coef * qBcoef * dtphys
+    mq = beta * coef * (qAcoef - qsat + dq_s_dt * tsurf) / oq
+    nq = - beta * coef * dq_s_dt / oq
 
     ! H
-    oh = 1. - (coef * petBcoef * dtime)
-    mh = coef * petAcoef / oh
-    dflux_s = - (coef * RCPD)/ oh
-
-    ! Tsurface
-    tsurf_new = (tsurf + cal / RCPD * dtime * (radsol + mh + sl * mq) &
-         + dif_grnd * t_grnd * dtime) / (1. - dtime * cal / RCPD * (dflux_s &
-         + sl * nq) + dtime * dif_grnd)
-
+    oh = 1. - coef * tBcoef * dtphys
+    mh = coef * tAcoef / oh
+    dflux_s = - coef * RCPD / oh
+
+    tsurf_new = (tsurf + cal / RCPD * dtphys * (radsol + mh + sl * mq) &
+         + dif_grnd * t_grnd * dtphys) / (1. - dtphys * cal / RCPD * (dflux_s &
+         + sl * nq) + dtphys * dif_grnd)
     evap = - mq - nq * tsurf_new
     fluxlat = - evap * sl
     flux_t = mh + dflux_s * tsurf_new
     dflux_l = sl * nq
-
-    ! Nouvelle valeur de l'humidité au dessus du sol :
-    qsurf = (peqAcoef - peqBcoef * evap * dtime) * (1. - beta) + beta * (qsat &
+    qsurf = (qAcoef - qBcoef * evap * dtphys) * (1. - beta) + beta * (qsat &
          + dq_s_dt * (tsurf_new - tsurf))
 
   END SUBROUTINE calcul_fluxs