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C $Header: /u/u3/gcmpack/MITgcm/pkg/mom_fluxform/mom_v_bottomdrag.F,v 1.8 2003/10/09 04:19:20 edhill Exp $ |
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C $Name: $ |
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|
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#include "MOM_FLUXFORM_OPTIONS.h" |
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|
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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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crg There are probably many more routines in mom_fluxform and mom_vecin |
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crg using undefined values. |
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|
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CBOP |
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C !ROUTINE: MOM_V_BOTTOMDRAG |
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|
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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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|
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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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C G^v_{drag} = - ( r_b + C_D |v| + \frac{2}{\Delta r_c} ) v |
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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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|
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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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_RL viscFac |
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INTEGER myThid |
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|
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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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|
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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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INTEGER I,J,kDown,kDownC,kBottom |
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_RL rdrckp1,maskDown |
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CEOP |
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|
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C- No-slip BCs impose a drag at bottom |
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IF ( buoyancyRelation .EQ. 'OCEANIC' ) THEN |
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kBottom = Nr |
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kDown = min(k+1,kBottom) |
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kDownC = kDown |
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ELSEIF ( buoyancyRelation .EQ. 'OCEANICP' .OR. |
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& buoyancyRelation .EQ. 'ATMOSPHERIC' ) THEN |
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kBottom = 1 |
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kDown = max(k-1,kBottom) |
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kDownC = k |
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ELSE |
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cph k-assignments here are redundant but good for TAF |
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kBottom = Nr |
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kDown = min(k+1,kBottom) |
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kDownC = kDown |
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STOP 'S/R MOM_V_BOTTOMDRAG: We should never reach this point!' |
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ENDIF |
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rdrckp1=recip_drC(kDownC) |
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viscFac=1. |
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IF (.NOT. no_slip_bottom) viscFac=0. |
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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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& *( |
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& 2.*KappaRV(i,j,kDownC)*rkFac*rdrckp1*viscFac |
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#if (defined (ALLOW_AUTODIFF_TAMC) && \ |
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defined (ALLOW_BOTTOMDRAG_CONTROL)) |
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& + bottomdragfld(i,j,bi,bj) |
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#else |
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& + bottomDragLinear |
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#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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& *bottomDragQuadratic*sqrt(KE(i,j)+KE(i,j-1)) |
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& *(1.-maskDown)*vFld(i,j) |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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RETURN |
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END |
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