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jmc |
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C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_calc_strainrates.F,v 1.17 2010/11/05 08:13:03 mlosch Exp $ |
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mlosch |
1.1 |
C $Name: $ |
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#include "SEAICE_OPTIONS.h" |
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jmc |
1.18 |
#ifdef ALLOW_OBCS |
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# include "OBCS_OPTIONS.h" |
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#else |
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# define OBCS_UVICE_OLD |
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#endif |
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mlosch |
1.1 |
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jmc |
1.18 |
CBOP |
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C !ROUTINE: SEAICE_CALC_STRAINRATES |
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C !INTERFACE: |
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jmc |
1.8 |
SUBROUTINE SEAICE_CALC_STRAINRATES( |
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mlosch |
1.1 |
I uFld, vFld, |
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mlosch |
1.12 |
O e11Loc, e22Loc, e12Loc, |
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mlosch |
1.14 |
I iStep, myTime, myIter, myThid ) |
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jmc |
1.18 |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE SEAICE_CALC_STRAINRATES |
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C | o compute strain rates from ice velocities |
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C *==========================================================* |
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C | written by Martin Losch, Apr 2007 |
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C *==========================================================* |
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C \ev |
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C !USES: |
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mlosch |
1.1 |
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 "GRID.h" |
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#include "SEAICE_PARAMS.h" |
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mlosch |
1.11 |
#include "SEAICE.h" |
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mlosch |
1.1 |
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#ifdef ALLOW_AUTODIFF_TAMC |
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# include "tamc.h" |
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#endif |
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1.18 |
C !INPUT/OUTPUT PARAMETERS: |
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1.1 |
C === Routine arguments === |
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jmc |
1.18 |
C uFld :: ice velocity, u-component |
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C vFld :: ice velocity, v-component |
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C e11Loc :: strain rate tensor, component 1,1 |
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C e22Loc :: strain rate tensor, component 2,2 |
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C e12Loc :: strain rate tensor, component 1,2 |
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jmc |
1.8 |
C iStep :: Sub-time-step number |
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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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mlosch |
1.14 |
_RL uFld (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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_RL vFld (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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mlosch |
1.12 |
_RL e11Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL e22Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL e12Loc (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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jmc |
1.18 |
INTEGER iStep |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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CEOP |
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mlosch |
1.1 |
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#ifdef SEAICE_CGRID |
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#ifdef SEAICE_ALLOW_DYNAMICS |
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jmc |
1.18 |
C !LOCAL VARIABLES: |
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mlosch |
1.1 |
C === Local variables === |
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jmc |
1.18 |
C i,j,bi,bj :: Loop counters |
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mlosch |
1.1 |
INTEGER i, j, bi, bj |
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jmc |
1.18 |
C hFacU, hFacV :: determine the no-slip boundary condition |
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mlosch |
1.2 |
INTEGER k |
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mlosch |
1.11 |
_RS hFacU, hFacV, noSlipFac |
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mlosch |
1.15 |
C auxillary variables that help writing code that |
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C vectorizes even after TAFization |
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_RL dudx (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL dvdy (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL dudy (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL dvdx (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL uave (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vave (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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mlosch |
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k = 1 |
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mlosch |
1.11 |
noSlipFac = 0. _d 0 |
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IF ( SEAICE_no_slip ) noSlipFac = 1. _d 0 |
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mlosch |
1.1 |
C |
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mlosch |
1.11 |
DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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mlosch |
1.15 |
C abbreviations on C-points, need to do them in separate loops |
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C for vectorization |
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mlosch |
1.11 |
DO j=1-Oly,sNy+Oly-1 |
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DO i=1-Olx,sNx+Olx-1 |
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dudx(i,j) = _recip_dxF(i,j,bi,bj) * |
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& (uFld(i+1,j,bi,bj)-uFld(i,j,bi,bj)) |
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uave(i,j) = 0.5 _d 0 * (uFld(i,j,bi,bj)+uFld(i+1,j,bi,bj)) |
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mlosch |
1.15 |
ENDDO |
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ENDDO |
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DO j=1-Oly,sNy+Oly-1 |
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DO i=1-Olx,sNx+Olx-1 |
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dvdy(i,j) = _recip_dyF(i,j,bi,bj) * |
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& (vFld(i,j+1,bi,bj)-vFld(i,j,bi,bj)) |
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vave(i,j) = 0.5 _d 0 * (vFld(i,j,bi,bj)+vFld(i,j+1,bi,bj)) |
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mlosch |
1.15 |
ENDDO |
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ENDDO |
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C evaluate strain rates at C-points |
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DO j=1-Oly,sNy+Oly-1 |
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DO i=1-Olx,sNx+Olx-1 |
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e11Loc(i,j,bi,bj) = dudx(i,j) + vave(i,j) * k2AtC(i,j,bi,bj) |
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e22Loc(i,j,bi,bj) = dvdy(i,j) + uave(i,j) * k1AtC(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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#ifndef OBCS_UVICE_OLD |
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C-- for OBCS: assume no gradient beyong OB |
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DO j=1-Oly,sNy+Oly-1 |
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DO i=1-Olx,sNx+Olx-1 |
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e11Loc(i,j,bi,bj) = e11Loc(i,j,bi,bj)*maskInC(i,j,bi,bj) |
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e22Loc(i,j,bi,bj) = e22Loc(i,j,bi,bj)*maskInC(i,j,bi,bj) |
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mlosch |
1.11 |
ENDDO |
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ENDDO |
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jmc |
1.18 |
#endif /* OBCS_UVICE_OLD */ |
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mlosch |
1.15 |
C abbreviations at Z-points, need to do them in separate loops |
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C for vectorization |
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DO j=1-Oly+1,sNy+Oly |
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DO i=1-Olx+1,sNx+Olx |
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dudy(i,j) = ( uFld(i,j,bi,bj) - uFld(i ,j-1,bi,bj) ) |
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& * _recip_dyU(i,j,bi,bj) |
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uave(i,j) = 0.5 _d 0 * (uFld(i,j,bi,bj)+uFld(i ,j-1,bi,bj)) |
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mlosch |
1.15 |
ENDDO |
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ENDDO |
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DO j=1-Oly+1,sNy+Oly |
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DO i=1-Olx+1,sNx+Olx |
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dvdx(i,j) = ( vFld(i,j,bi,bj) - vFld(i-1,j ,bi,bj) ) |
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& * _recip_dxV(i,j,bi,bj) |
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vave(i,j) = 0.5 _d 0 * (vFld(i,j,bi,bj)+vFld(i-1,j ,bi,bj)) |
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mlosch |
1.15 |
ENDDO |
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ENDDO |
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C evaluate strain rates at Z-points |
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mlosch |
1.11 |
DO j=1-Oly+1,sNy+Oly |
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DO i=1-Olx+1,sNx+Olx |
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hFacU = _maskW(i,j,k,bi,bj) - _maskW(i,j-1,k,bi,bj) |
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hFacV = _maskS(i,j,k,bi,bj) - _maskS(i-1,j,k,bi,bj) |
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e12Loc(i,j,bi,bj) = 0.5 _d 0 * ( |
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& dudy(i,j) + dvdx(i,j) |
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& - k1AtZ(i,j,bi,bj) * vave(i,j) |
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& - k2AtZ(i,j,bi,bj) * uave(i,j) |
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mlosch |
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& ) |
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& *maskC(i ,j ,k,bi,bj)*maskC(i-1,j ,k,bi,bj) |
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& *maskC(i ,j-1,k,bi,bj)*maskC(i-1,j-1,k,bi,bj) |
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mlosch |
1.11 |
& + 2.0 _d 0 * noSlipFac * ( |
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jmc |
1.18 |
& 2.0 _d 0 * uave(i,j) * _recip_dyU(i,j,bi,bj) * hFacU |
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& + 2.0 _d 0 * vave(i,j) * _recip_dxV(i,j,bi,bj) * hFacV |
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mlosch |
1.11 |
& ) |
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C no slip at the boundary implies u(j)+u(j-1)=0 and v(i)+v(i-1)=0 |
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C accross the boundary; this is already accomplished by masking so |
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C that the following lines are not necessary |
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jmc |
1.18 |
c$$$ & - hFacV * k1AtZ(i,j,bi,bj) * vave(i,j) |
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c$$$ & - hFacU * k2AtZ(i,j,bi,bj) * uave(i,j) |
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mlosch |
1.11 |
ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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gforget |
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#ifdef ALLOW_AUTODIFF_TAMC |
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#ifdef SEAICE_DYN_STABLE_ADJOINT |
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cgf zero out adjoint fields to stabilize pkg/seaice dyna. adjoint |
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CALL ZERO_ADJ( 1, e11Loc, myThid) |
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CALL ZERO_ADJ( 1, e12Loc, myThid) |
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CALL ZERO_ADJ( 1, e22Loc, myThid) |
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#endif |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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mlosch |
1.1 |
#endif /* SEAICE_ALLOW_DYNAMICS */ |
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#endif /* SEAICE_CGRID */ |
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RETURN |
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END |
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