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C $Header: /u/gcmpack/models/MITgcmUV/model/src/calc_exact_eta.F,v 1.4 2001/09/19 13:58:08 jmc Exp $ |
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C $Name: $ |
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|
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#include "CPP_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: CALC_EXACT_ETA |
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C !INTERFACE: |
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SUBROUTINE CALC_EXACT_ETA( UpdateEtaN_EtaH, |
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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 CALC_EXACT_ETA |
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C | o Compute again the surface "r-anomaly" (eta) 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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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C UpdateEtaN_EtaH :: flag to distinguishe if this S/R is called |
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C at the end of a time step (TRUE) to update EtaN, |
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C or at the beginning of the time sptep (FALSE) to update EtaH |
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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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LOGICAL UpdateEtaN_EtaH |
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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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#ifdef EXACT_CONSERV |
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C Local variables in common block |
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C hDivFlow :: Div. Barotropic Flow at current time [transport unit m3/s] |
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COMMON /EXACT_ETA_LOCAL/ hDivFlow |
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_RL hDivFlow(1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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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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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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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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IF ( UpdateEtaN_EtaH .OR. myTime.EQ.StartTime ) 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,bi,bj) = 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,bi,bj) = hDivFlow(i,j,bi,bj) |
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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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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 ( UpdateEtaN_EtaH ) THEN |
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|
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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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IF (implicDiv2Dflow .NE. 0. _d 0 ) THEN |
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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*hDivFlow(i,j,bi,bj) |
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& *recip_rA(i,j,bi,bj)*DeltaTmom |
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ENDDO |
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ENDDO |
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ELSE |
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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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ENDIF |
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|
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ELSE |
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|
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C-- Update etaH at the beginning of the time step : |
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C Incorporate the Explicit part of -Divergence(Barotropic_Flow) |
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IF (implicDiv2Dflow .NE. 1. _d 0 ) THEN |
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DO j=1,sNy |
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DO i=1,sNx |
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etaH(i,j,bi,bj) = etaN(i,j,bi,bj) |
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& - (1. - implicDiv2Dflow)*hDivFlow(i,j,bi,bj) |
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& *recip_rA(i,j,bi,bj)*DeltaTmom |
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ENDDO |
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ENDDO |
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ELSE |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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etaH(i,j,bi,bj) = etaN(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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ENDIF |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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#endif /* EXACT_CONSERV */ |
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|
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RETURN |
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END |
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