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C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_oceandrag_coeffs.F,v 1.2 2013/02/14 17:02:25 mlosch Exp $ |
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C $Name: $ |
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|
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#include "SEAICE_OPTIONS.h" |
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#ifdef ALLOW_OBCS |
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# include "OBCS_OPTIONS.h" |
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#endif |
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#ifdef ALLOW_AUTODIFF |
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# include "AUTODIFF_OPTIONS.h" |
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#endif |
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|
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CBOP |
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C !ROUTINE: SEAICE_OCEANDRAG_COEFFS |
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C !INTERFACE: |
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SUBROUTINE SEAICE_OCEANDRAG_COEFFS( |
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I uIceLoc, vIceLoc, |
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O CwatC, |
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I iStep, myTime, myIter, myThid ) |
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|
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE SEAICE_OCEANDRAG_COEFFS |
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C | o Compute the drag coefficients for ice-ocean drag, |
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C | so that we can use the same code for different solvers |
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C *==========================================================* |
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C | written by Martin Losch, Oct 2012 |
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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 "GRID.h" |
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#include "DYNVARS.h" |
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#include "SEAICE_SIZE.h" |
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#include "SEAICE_PARAMS.h" |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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# include "tamc.h" |
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#endif |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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C myTime :: Simulation time |
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C myIter :: Simulation timestep number |
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C myThid :: my Thread Id. number |
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C iStep :: current sub-time step iterate |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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INTEGER iStep |
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C u/vIceLoc :: local copies of the current ice velocity |
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_RL uIceLoc(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL vIceLoc(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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C CwatC :: drag coefficients |
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_RL CwatC(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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|
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#if ( (defined SEAICE_CGRID) && (defined SEAICE_ALLOW_DYNAMICS) ) |
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C === local variables === |
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C i,j,bi,bj,ksrf :: loop indices |
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INTEGER i,j,bi,bj |
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INTEGER kSrf |
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_RL TEMPVAR |
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CEOP |
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|
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kSrf=1 |
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|
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO j=1-OLy,sNy+Oly-1 |
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DO i=1-OLx,sNx+OLy-1 |
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C non-linear water drag coefficients DWATN |
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#ifdef OBCS_UVICE_OLD |
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TEMPVAR = 0.25 _d 0*( |
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& ( ( uIceLoc(i ,j,bi,bj)-uVel(i ,j,kSrf,bi,bj) ) |
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& +( uIceLoc(i+1,j,bi,bj)-uVel(i+1,j,kSrf,bi,bj) ) |
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& )**2 |
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& + ( ( vIceLoc(i, j ,bi,bj)-vVel(i, j ,kSrf,bi,bj) ) |
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& +( vIceLoc(i,j+1,bi,bj)-vVel(i,j+1,kSrf,bi,bj) ) |
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& )**2 ) |
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#else /* OBCS_UVICE_OLD */ |
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TEMPVAR = 0.25 _d 0*( |
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& ( ( uIceLoc(i ,j,bi,bj)-uVel(i ,j,kSrf,bi,bj) ) |
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& *maskInW( i ,j,bi,bj) |
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& +( uIceLoc(i+1,J,bi,bj)-uVel(i+1,j,kSrf,bi,bj) ) |
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& *maskInW(i+1,j,bi,bj) )**2 |
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& + ( ( vIceLoc(i,j ,bi,bj)-vVel(i,j ,kSrf,bi,bj) ) |
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& *maskInS(i, j ,bi,bj) |
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& +( vIceLoc(i,j+1,bi,bj)-vVel(i,j+1,kSrf,bi,bj) ) |
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& *maskInS(i,j+1,bi,bj) )**2 ) |
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#endif /* OBCS_UVICE_OLD */ |
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IF ( YC(I,J,bi,bj) .LT. ZERO ) THEN |
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IF ( SEAICE_waterDrag_south.LE.0. ) THEN |
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CwatC(I,J,bi,bj)=0. |
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ELSEIF ( TEMPVAR |
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& .LE.(0.25 _d 0/SEAICE_waterDrag_south)**2 ) THEN |
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CwatC(I,J,bi,bj)=0.25 _d 0 |
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ELSE |
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CwatC(I,J,bi,bj)=SEAICE_waterDrag_south*SQRT(TEMPVAR) |
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ENDIF |
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ELSE |
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IF ( SEAICE_waterDrag.LE.0. ) THEN |
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CwatC(I,J,bi,bj)=0. |
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ELSEIF ( TEMPVAR.LE.(0.25 _d 0/SEAICE_waterDrag)**2 ) THEN |
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CwatC(I,J,bi,bj)=0.25 _d 0 |
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ELSE |
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CwatC(I,J,bi,bj)=SEAICE_waterDrag*SQRT(TEMPVAR) |
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ENDIF |
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ENDIF |
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CwatC(I,J,bi,bj) = CwatC(I,J,bi,bj) * maskC(I,J,kSrf,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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#endif /* SEAICE_ALLOW_DYNAMICS and SEAICE_CGRID */ |
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|
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RETURN |
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END |
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