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jmc |
1.9 |
C $Header: /u/gcmpack/MITgcm/pkg/mom_common/mom_v_bottomdrag.F,v 1.8 2008/10/20 21:40:22 jmc Exp $ |
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heimbach |
1.1 |
C $Name: $ |
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jmc |
1.2 |
#include "MOM_COMMON_OPTIONS.h" |
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heimbach |
1.1 |
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crg butterflies |
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crg using undefined values of kapparv in mom_v_bottomdrag |
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crg mom_v_bottomdrag must have iMin,iMax,jMin,jMax as arguments |
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crg and only use values being calculated in calc_viscosity |
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jmc |
1.8 |
C jmc: comment above already did not apply when checked-in (2003/03/07): |
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C kapparu & v fully initialised in calc_viscosity after 2002/05/30. |
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heimbach |
1.1 |
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CBOP |
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C !ROUTINE: MOM_V_BOTTOMDRAG |
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C !INTERFACE: ========================================================== |
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SUBROUTINE MOM_V_BOTTOMDRAG( |
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I bi,bj,k, |
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I vFld, KE, KappaRV, |
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O vDragTerms, |
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I myThid) |
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C !DESCRIPTION: |
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C Calculates the drag due to friction and the no-slip condition at bottom: |
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C \begin{equation*} |
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jmc |
1.7 |
C G^v_{drag} = - \frac{1}{\Delta r_f} ( r_b + C_D |v| + \frac{2}{\Delta r_c} ) v |
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heimbach |
1.1 |
C \end{equation*} |
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C !USES: =============================================================== |
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IMPLICIT NONE |
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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 "GRID.h" |
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jmc |
1.8 |
#ifdef ALLOW_BOTTOMDRAG_CONTROL |
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# include "DYNVARS.h" |
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#endif |
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heimbach |
1.1 |
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C !INPUT PARAMETERS: =================================================== |
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C bi,bj :: tile indices |
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C k :: vertical level |
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C vFld :: meridional flow |
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C KE :: Kinetic energy |
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C KappaRV :: vertical viscosity |
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C myThid :: thread number |
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INTEGER bi,bj,k |
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_RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL KE(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL KappaRV(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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INTEGER myThid |
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C !OUTPUT PARAMETERS: ================================================== |
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C vDragTerms :: drag term |
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_RL vDragTerms(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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C !LOCAL VARIABLES: ==================================================== |
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C i,j :: loop indices |
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C Kp1 :: =k+1 for k<Nr, =Nr for k>=Nr |
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jmc |
1.8 |
INTEGER i,j,kDown,kDownC,kBottom |
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jmc |
1.9 |
_RL viscFac, dragFac |
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_RL rdrckp1, maskDown |
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heimbach |
1.1 |
CEOP |
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C- No-slip BCs impose a drag at bottom |
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jmc |
1.3 |
IF ( usingZCoords ) THEN |
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heimbach |
1.1 |
kBottom = Nr |
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kDown = min(k+1,kBottom) |
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kDownC = kDown |
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jmc |
1.9 |
c dragFac = mass2rUnit*rhoConst |
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c dragFac = wUnit2rVel(k+1) |
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dragFac = 1. _d 0 |
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jmc |
1.3 |
ELSE |
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heimbach |
1.1 |
kBottom = 1 |
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kDown = max(k-1,kBottom) |
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kDownC = k |
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jmc |
1.9 |
dragFac = mass2rUnit*rhoConst |
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c dragFac = wUnit2rVel(k) |
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jmc |
1.3 |
ENDIF |
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heimbach |
1.1 |
rdrckp1=recip_drC(kDownC) |
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jmc |
1.4 |
viscFac=0. |
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IF (no_slip_bottom) viscFac=1. |
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heimbach |
1.1 |
IF (k.EQ.kBottom) rdrckp1=recip_drF(k) |
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DO j=1-Oly+1,sNy+Oly-1 |
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DO i=1-Olx,sNx+Olx-1 |
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maskDown=_maskS(i,j,kdown,bi,bj) |
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IF (k.EQ.kBottom) maskDown=0. |
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vDragTerms(i,j)= |
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& -_recip_hFacS(i,j,k,bi,bj)*recip_drF(k) |
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jmc |
1.8 |
& *( |
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jmc |
1.4 |
& 2.*KappaRV(i,j,kDownC)*rdrckp1*viscFac |
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jmc |
1.8 |
#ifdef ALLOW_BOTTOMDRAG_CONTROL |
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jmc |
1.9 |
& + bottomdragfld(i,j,bi,bj)*dragFac |
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heimbach |
1.1 |
#else |
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jmc |
1.9 |
& + bottomDragLinear*dragFac |
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heimbach |
1.1 |
#endif |
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& )*(1.-maskDown)*vFld(i,j) |
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IF ( (KE(i,j)+KE(i,j-1)) .NE. 0. ) THEN |
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vDragTerms(i,j)=vDragTerms(i,j) |
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& -_recip_hFacS(i,j,k,bi,bj)*recip_drF(k) |
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jmc |
1.9 |
& *bottomDragQuadratic*SQRT(KE(i,j)+KE(i,j-1))*dragFac |
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heimbach |
1.1 |
& *(1.-maskDown)*vFld(i,j) |
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ENDIF |
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ENDDO |
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ENDDO |
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jmc |
1.5 |
#ifdef ALLOW_DIAGNOSTICS |
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IF (useDiagnostics) THEN |
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CALL DIAGNOSTICS_FILL(vDragTerms,'VBotDrag',k,1,2,bi,bj,myThid) |
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
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heimbach |
1.1 |
RETURN |
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END |
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