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C $Header: /u/gcmpack/MITgcm/pkg/down_slope/dwnslp_calc_flow.F,v 1.2 2008/09/22 17:57:05 jmc Exp $ |
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C $Name: $ |
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|
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#include "DWNSLP_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: DWNSLP_CALC_FLOW |
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C !INTERFACE: |
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SUBROUTINE DWNSLP_CALC_FLOW( |
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I bi, bj, kBottom, rho3d, |
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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 DWNSLP_CALC_FLOW |
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C | o Detect active site of Down-Sloping flow and compute |
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C | the corresponding volume transport |
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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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|
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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 "DWNSLP_SIZE.h" |
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#include "DWNSLP_PARAMS.h" |
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#include "DWNSLP_VARS.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 bi,bj :: Tile indices |
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C kBottom :: Vertical index of bottom grid cell. |
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C rho3d :: In-situ density [kg/m3] computed at z=rC ; |
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C myTime :: Current time in simulation |
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C myIter :: Current time-step number |
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C myThid :: my Thread Id number |
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INTEGER bi, bj |
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INTEGER kBottom( xySize, nSx,nSy ) |
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_RL rho3d ( xySize, Nr,nSx,nSy ) |
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_RL myTime |
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INTEGER myIter, myThid |
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|
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#ifdef ALLOW_DOWN_SLOPE |
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|
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C !LOCAL VARIABLES: |
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C === Local variables === |
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C msgBuf :: Informational/error message buffer |
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C ijd :: horiz. index of deep water column receiving dense water flow |
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C ijs :: horiz. index of shallow water column (e.g. shelf) |
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C from which dense water flow originates |
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c CHARACTER*(MAX_LEN_MBUF) msgBuf |
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INTEGER k |
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INTEGER n, ijd, ijr, ijs |
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INTEGER kdeep, ishelf, jshelf, kshelf |
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_RL dRhoH |
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INTEGER downward |
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#ifdef ALLOW_DIAGNOSTICS |
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LOGICAL doDiagDwnSlpFlow |
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INTEGER ij |
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_RL sgnFac |
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_RL uFlow( xySize ) |
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_RL vFlow( xySize ) |
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C- Functions: |
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LOGICAL DIAGNOSTICS_IS_ON |
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EXTERNAL DIAGNOSTICS_IS_ON |
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#endif /* ALLOW_DIAGNOSTICS */ |
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|
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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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c downward = rkSign*NINT(gravitySign) |
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downward = 1 |
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IF ( usingPCoords ) downward = -1 |
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|
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#ifdef ALLOW_DIAGNOSTICS |
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IF ( useDiagnostics ) THEN |
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doDiagDwnSlpFlow = DIAGNOSTICS_IS_ON( 'DSLPuFlw', myThid ) |
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& .OR. DIAGNOSTICS_IS_ON( 'DSLPvFlw', myThid ) |
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IF ( doDiagDwnSlpFlow ) THEN |
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DO ij=1,xySize |
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uFlow(ij) = 0. _d 0 |
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vFlow(ij) = 0. _d 0 |
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ENDDO |
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ENDIF |
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ELSE |
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doDiagDwnSlpFlow = .FALSE. |
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
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|
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DO n=1,DWNSLP_NbSite(bi,bj) |
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DWNSLP_deepK(n,bi,bj) = 0 |
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|
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C- detect density gradient along the slope => Downsloping flow |
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|
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ijd = DWNSLP_ijDeep(n,bi,bj) |
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ijr = DWNSLP_shVsD(n,bi,bj) |
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ijs = ijd + ijr |
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kshelf = kBottom(ijs,bi,bj) |
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|
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dRhoH = rho3d(ijs,kshelf,bi,bj) |
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& -rho3d(ijd,kshelf,bi,bj) |
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c IF ( dRhoH.GT.0. _d 0 ) THEN |
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IF ( rho3d(ijs,kshelf+1,bi,bj).GT.rho3d(ijd,kshelf+1,bi,bj) |
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& .AND. dRhoH.GT.0. _d 0 ) THEN |
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|
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C- search for deepest level where Rho_shelf > Rho_deep |
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kdeep = kshelf |
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DO k=kshelf+1,kBottom(ijd,bi,bj),downward |
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IF ( rho3d(ijs,k,bi,bj).GT.rho3d(ijd,k,bi,bj) ) kdeep = k |
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ENDDO |
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DWNSLP_deepK(n,bi,bj) = kdeep |
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|
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C- Compute the Volume Transport : |
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C- same formulation as described in the paper: |
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c downslpFlow = DWNSLP_gamma/mu *gravity*dRhoH*recip_rhoConst |
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C with DWNSLP_Gamma = slope * effective cross-section area |
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DWNSLP_Transp(n,bi,bj) = DWNSLP_Gamma(n,bi,bj) |
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& *DWNSLP_rec_mu*gravity*dRhoH*recip_rhoConst |
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|
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#ifdef ALLOW_DIAGNOSTICS |
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IF ( doDiagDwnSlpFlow ) THEN |
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ij = MAX( ijd, ijs ) |
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sgnFac = SIGN(1,-ijr) |
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IF ( ABS(ijr).EQ.1 ) THEN |
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uFlow(ij) = sgnFac*DWNSLP_Transp(n,bi,bj) |
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ELSE |
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vFlow(ij) = sgnFac*DWNSLP_Transp(n,bi,bj) |
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ENDIF |
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
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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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ENDDO |
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|
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IF (debugMode) THEN |
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WRITE(DWNSLP_ioUnit,'(A,I8,2I4)') |
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& ' DWNSLP_CALC_FLOW: iter,bi,bj=',myIter,bi,bj |
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WRITE(DWNSLP_ioUnit,'(A)') |
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& ' bi bj n : ijd ijr is js ; ks kd-s Transp :' |
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DO n=1,DWNSLP_NbSite(bi,bj) |
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IF (DWNSLP_deepK(n,bi,bj).NE.0) THEN |
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ijs = DWNSLP_ijDeep(n,bi,bj) + DWNSLP_shVsD(n,bi,bj) |
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ishelf = 1-OLx + mod(ijs-1,xSize) |
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jshelf = 1-OLy + (ijs-1)/xSize |
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kshelf = kBottom(ijs,bi,bj) |
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WRITE(DWNSLP_ioUnit,'(2I4,I6,A,I8,I6,2I4,A,2I4,1PE14.6)') |
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& bi,bj,n,' :', DWNSLP_ijDeep(n,bi,bj), |
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& DWNSLP_shVsD(n,bi,bj), ishelf,jshelf, |
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& ' ;', kshelf, DWNSLP_deepK(n,bi,bj)-kshelf, |
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& DWNSLP_Transp(n,bi,bj) |
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ENDIF |
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ENDDO |
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WRITE(DWNSLP_ioUnit,*) |
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ENDIF |
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|
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#ifdef ALLOW_DIAGNOSTICS |
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IF ( doDiagDwnSlpFlow ) THEN |
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CALL DIAGNOSTICS_FILL( uFlow, 'DSLPuFlw', 0,1,2,bi,bj,myThid ) |
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CALL DIAGNOSTICS_FILL( vFlow, 'DSLPvFlw', 0,1,2,bi,bj,myThid ) |
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
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|
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#endif /* ALLOW_DOWN_SLOPE */ |
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|
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RETURN |
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END |
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