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C $Header: /u/gcmpack/MITgcm/model/src/integr_continuity.F,v 1.16 2005/12/08 15:44:34 heimbach Exp $ |
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C $Name: $ |
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|
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#include "PACKAGES_CONFIG.h" |
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#include "CPP_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: INTEGR_CONTINUITY |
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C !INTERFACE: |
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SUBROUTINE INTEGR_CONTINUITY( |
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I bi, bj, uFld, vFld, |
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I myTime, myIter, myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE INTEGR_CONTINUITY |
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C | o Integrate the continuity Eq : compute vertical velocity |
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C | and free surface "r-anomaly" (etaN) to satisfy |
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C | exactly the convervation of the Total Volume |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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C == Global variables |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "DYNVARS.h" |
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#include "GRID.h" |
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#include "SURFACE.h" |
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#include "FFIELDS.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C uFld :: Zonal velocity ( m/s ) |
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C vFld :: Meridional velocity ( m/s ) |
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C bi,bj :: tile index |
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C myTime :: Current time in simulation |
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C myIter :: Current iteration number in simulation |
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C myThid :: Thread number for this instance of the routine. |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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INTEGER bi,bj |
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_RL uFld(1-Olx:sNx+Olx,1-Oly:sNy+Oly,Nr,nSx,nSy) |
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_RL vFld(1-Olx:sNx+Olx,1-Oly:sNy+Oly,Nr,nSx,nSy) |
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|
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C !LOCAL VARIABLES: |
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C Local variables in common block |
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|
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C Local variables |
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C i,j,k :: Loop counters |
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C uTrans :: Volume transports ( uVel.xA ) |
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C vTrans :: Volume transports ( vVel.yA ) |
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C hDivFlow :: Div. Barotropic Flow [transport unit m3/s] |
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INTEGER i,j,k |
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_RL uTrans(1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
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_RL vTrans(1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
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_RL hDivFlow(1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
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_RL facEmP |
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CEOP |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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#ifdef EXACT_CONSERV |
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IF (exactConserv) THEN |
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|
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C-- Compute the Divergence of The Barotropic Flow : |
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|
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C- Initialise |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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hDivFlow(i,j) = 0. _d 0 |
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utrans(i,j) = 0. _d 0 |
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vtrans(i,j) = 0. _d 0 |
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ENDDO |
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ENDDO |
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|
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DO k=1,Nr |
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|
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C- Calculate velocity field "volume transports" through tracer cell faces |
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DO j=1,sNy+1 |
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DO i=1,sNx+1 |
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uTrans(i,j) = uFld(i,j,k,bi,bj)*_dyG(i,j,bi,bj) |
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& *drF(k)*_hFacW(i,j,k,bi,bj) |
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vTrans(i,j) = vFld(i,j,k,bi,bj)*_dxG(i,j,bi,bj) |
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& *drF(k)*_hFacS(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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|
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C- Integrate vertically the Horizontal Divergence |
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DO j=1,sNy |
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DO i=1,sNx |
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hDivFlow(i,j) = hDivFlow(i,j) |
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& +maskC(i,j,k,bi,bj)*( uTrans(i+1,j)-uTrans(i,j) |
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& +vTrans(i,j+1)-vTrans(i,j) ) |
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ENDDO |
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ENDDO |
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|
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C- End DO k=1,Nr |
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ENDDO |
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|
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C------------------------------------ |
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facEmP = 0. |
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IF (useRealFreshWaterFlux) facEmP = convertEmP2rUnit |
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IF ( myTime.EQ.startTime .AND. myTime.NE.baseTime |
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& .AND. useRealFreshWaterFlux) THEN |
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|
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C needs previous time-step value of E-P-R, that has not been loaded |
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C and was not in old pickup-file ; try to use etaN & etaH instead. |
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IF ( usePickupBeforeC54 ) THEN |
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DO j=1,sNy |
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DO i=1,sNx |
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dEtaHdt(i,j,bi,bj) = (etaN(i,j,bi,bj)-etaH(i,j,bi,bj)) |
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& / (implicDiv2Dflow*deltaTfreesurf) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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DO j=1,sNy |
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DO i=1,sNx |
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PmEpR(i,j,bi,bj) = dEtaHdt(i,j,bi,bj) |
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& + hDivFlow(i,j)*recip_rA(i,j,bi,bj) |
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PmEpR(i,j,bi,bj) = PmEpR(i,j,bi,bj)/convertEmP2rUnit |
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ENDDO |
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ENDDO |
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ELSEIF ( myTime.EQ.startTime ) THEN |
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DO j=1,sNy |
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DO i=1,sNx |
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PmEpR(i,j,bi,bj) = 0. _d 0 |
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dEtaHdt(i,j,bi,bj) = -hDivFlow(i,j)*recip_rA(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ELSE |
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C-- Needs to get valid PmEpR (for T,S forcing) also in overlap regions |
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C (e.g., if using KPP) => set over full index range |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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PmEpR(i,j,bi,bj) = -EmPmR(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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DO j=1,sNy |
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DO i=1,sNx |
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dEtaHdt(i,j,bi,bj) = -hDivFlow(i,j)*recip_rA(i,j,bi,bj) |
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& -facEmP*EmPmR(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDIF |
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C------------------------------------ |
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|
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ENDIF |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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IF (exactConserv .AND. myTime.NE.startTime) THEN |
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C-- Update etaN at the end of the time step : |
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C Incorporate the Implicit part of -Divergence(Barotropic_Flow) |
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|
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IF (implicDiv2Dflow.EQ. 0. _d 0) THEN |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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etaN(i,j,bi,bj) = etaH(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ELSE |
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DO j=1,sNy |
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DO i=1,sNx |
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etaN(i,j,bi,bj) = etaH(i,j,bi,bj) |
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& + implicDiv2Dflow*dEtaHdt(i,j,bi,bj)*deltaTfreesurf |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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#ifdef ALLOW_OBCS |
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C-- Apply OBC to etaN if NonLin-FreeSurf, reset to zero otherwise: |
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IF ( useOBCS ) CALL OBCS_APPLY_ETA( bi, bj, etaN, myThid ) |
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#endif /* ALLOW_OBCS */ |
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|
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ENDIF |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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# ifdef NONLIN_FRSURF |
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IF (select_rStar .NE. 0) THEN |
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# ifndef DISABLE_RSTAR_CODE |
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DO j=1,sNy |
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DO i=1,sNx |
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rStarDhCDt(i,j,bi,bj) = |
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& dEtaHdt(i,j,bi,bj)*recip_Rcol(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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# endif /* DISABLE_RSTAR_CODE */ |
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ENDIF |
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# endif /* NONLIN_FRSURF */ |
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|
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#endif /* EXACT_CONSERV */ |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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DO k=Nr,1,-1 |
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C-- Integrate continuity vertically for vertical velocity |
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|
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CALL INTEGRATE_FOR_W( |
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I bi, bj, k, uFld, vFld, |
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O wVel, |
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I myThid ) |
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|
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#ifdef EXACT_CONSERV |
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IF ( k.EQ.Nr .AND. myTime.NE.baseTime .AND. |
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& useRealFreshWaterFlux .AND. usingPCoords ) THEN |
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|
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DO j=1,sNy |
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DO i=1,sNx |
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wVel(i,j,k,bi,bj) = wVel(i,j,k,bi,bj) |
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& +convertEmP2rUnit*PmEpR(i,j,bi,bj)*maskC(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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|
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ENDIF |
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#endif /* EXACT_CONSERV */ |
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|
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#ifdef ALLOW_OBCS |
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C-- Apply OBC to W if in N-H mode, reset to zero otherwise: |
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IF ( useOBCS ) CALL OBCS_APPLY_W( bi, bj, k, wVel, myThid ) |
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#endif /* ALLOW_OBCS */ |
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|
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C- End DO k=Nr,1,-1 |
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ENDDO |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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RETURN |
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END |
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