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C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_calc_viscosities.F,v 1.2 2006/03/18 00:32:43 mlosch Exp $ |
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C $Name: $ |
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|
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#include "SEAICE_OPTIONS.h" |
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|
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CStartOfInterface |
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SUBROUTINE SEAICE_CALC_VISCOSITIES( |
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I uFld, vFld, zMin, zMax, hEffM, press0, |
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O eta, zeta, press, |
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#ifdef SEAICE_ALLOW_EVP |
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O seaice_div, seaice_tension, seaice_shear, |
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#endif /* SEAICE_ALLOW_EVP */ |
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I myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE SEAICE_CALC_VISCOSITIES | |
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C | o compute shear and bulk viscositites eta, zeta and the | |
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C | ice strength P | |
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C | (see Zhang and Hibler, JGR, 102, 8691-8702, 1997) | |
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C |==========================================================| |
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C | written by Martin Losch, Mar 2006 | |
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C \==========================================================/ |
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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 "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 === Routine arguments === |
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C myThid - Thread no. that called this routine. |
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INTEGER myThid |
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_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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_RL zMin (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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_RL zMax (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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_RL hEffM (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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_RL press0(1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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_RL press (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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_RL eta (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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_RL zeta (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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#ifdef SEAICE_ALLOW_EVP |
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_RL seaice_div (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL seaice_tension(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL seaice_shear (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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#endif /* SEAICE_ALLOW_EVP */ |
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CEndOfInterface |
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|
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#ifdef SEAICE_CGRID |
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#ifdef SEAICE_ALLOW_DYNAMICS |
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C === Local variables === |
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C i,j,bi,bj - Loop counters |
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C e11, e12, e22 - components of strain rate tensor |
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C ecm2 - inverse of square of eccentricity of yield curve |
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INTEGER i, j, bi, bj |
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_RL e11, e12, e22 |
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_RL ECM2, DELT1, DELT2 |
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#ifdef SEAICE_ALLOW_EVP |
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_RL delta (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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#endif |
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|
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C-- FIRST SET UP BASIC CONSTANTS |
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ecm2=0. _d 0 |
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IF ( SEAICE_eccen .NE. 0. _d 0 ) ecm2=ONE/(SEAICE_eccen**2) |
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C |
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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+1,sNy+Oly-1 |
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DO i=1-Olx+1,sNx+Olx-1 |
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C NOW EVALUATE STRAIN RATES |
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e11= _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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& -HALF* |
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& (vFld(I,J,bi,bj)+vFld(I,J+1,bi,bj)) |
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& * _tanPhiAtU(I,J,bi,bj)*recip_rSphere |
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e22= _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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C one metric term is missing |
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e12=HALF*( |
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& (uFld(I,J+1,bi,bj)+uFld(I+1,J+1,bi,bj) |
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& -uFld(I,J-1,bi,bj)-uFld(I+1,J-1,bi,bj)) |
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& * 1. _d 0 / (dyC(I,J,bi,bj) + dyC(I,J-1,bi,bj)) |
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& + |
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& (vFld(I+1,J+1,bi,bj)+vFld(I+1,J,bi,bj) |
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& -vFld(I-1,J+1,bi,bj)-vFld(I-1,J,bi,bj)) |
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& * 1. _d 0 / (dxC(I,J,bi,bj) + dxC(I-1,J,bi,bj)) |
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& +HALF* |
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& (uFld(I, J, bi,bj)+uFld(I+1,J, bi,bj)) |
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& * _tanPhiAtU(I,J,bi,bj)*recip_rSphere) |
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C NOW EVALUATE VISCOSITIES |
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DELT1=(e11**2+e22**2)*(ONE+ECM2) |
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& +4. _d 0*ECM2*e12**2 |
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& +TWO*e11*e22*(ONE-ECM2) |
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IF ( DELT1 .LE. SEAICE_EPS_SQ ) THEN |
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DELT2=SEAICE_EPS |
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ELSE |
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DELT2=SQRT(DELT1) |
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ENDIF |
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zeta(I,J,bi,bj)=HALF*PRESS0(I,J,bi,bj)/DELT2 |
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C NOW PUT MIN AND MAX VISCOSITIES IN |
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zeta(I,J,bi,bj)=MIN(ZMAX(I,J,bi,bj),zeta(I,J,bi,bj)) |
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zeta(I,J,bi,bj)=MAX(ZMIN(I,J,bi,bj),zeta(I,J,bi,bj)) |
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C NOW SET VISCOSITIES TO ZERO AT HEFFMFLOW PTS |
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zeta (I,J,bi,bj) = zeta(I,J,bi,bj)*HEFFM(I,J,bi,bj) |
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eta (I,J,bi,bj) = ECM2*zeta(I,J,bi,bj) |
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press(I,J,bi,bj) = TWO*zeta(I,J,bi,bj)*DELT2 |
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#ifdef SEAICE_ALLOW_EVP |
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delta(I,J) = DELT2 |
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seaice_div (I,J,bi,bj) = (e11+e22)/DELT2*hEffM(I,J,bi,bj) |
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seaice_tension(I,J,bi,bj) = (e11-e22)/DELT2*hEffM(I,J,bi,bj) |
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C recompute e12 on Z point so that seaice_shear and seaice_sigma12 |
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C are also defined on Z points (one half and two drop out) |
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seaice_shear (I,J,bi,bj) = ( |
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& (uFld(I ,J ,bi,bj) * _dxC(I ,J ,bi,bj) |
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& -uFld(I ,J-1,bi,bj) * _dxC(I ,J-1,bi,bj) |
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& +vFld(I ,J ,bi,bj) * _dyC(I ,J ,bi,bj) |
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& -vFld(I-1,J ,bi,bj) * _dyC(I-1,J ,bi,bj)) |
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& * recip_rAz(I,J,bi,bj) |
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& + |
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& 0.25 _d 0 * (uFld(I,J,bi,bj)+uFld(I ,J-1,bi,bj)) |
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& * ( _tanPhiAtU(I,J,bi,bj) + _tanPhiAtU(I,J-1,bi,bj) ) |
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& *recip_rSphere |
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& ) |
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C one metric term is missing |
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#endif /* SEAICE_ALLOW_EVP */ |
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ENDDO |
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ENDDO |
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#ifdef SEAICE_ALLOW_EVP |
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DO j=1,sNy |
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DO i=1,sNx |
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DELT2 = 0.25 * ( delta(I,J ) + delta(I-1,J ) |
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& + delta(I,J-1) + delta(I-1,J-1) ) |
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seaice_shear(I,J,bi,bj) = |
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& seaice_shear(I,J,bi,bj)/DELT2 |
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& *hEffM(I ,J ,bi,bj)*hEffM(I-1,J ,bi,bj) |
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& *hEffM(I ,J-1,bi,bj)*hEffM(I-1,J-1,bi,bj) |
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ENDDO |
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ENDDO |
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#endif /* SEAICE_ALLOW_EVP */ |
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ENDDO |
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ENDDO |
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|
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C-- Update overlap regions |
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_EXCH_XY_R8( eta, myThid) |
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_EXCH_XY_R8( zeta, myThid) |
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_EXCH_XY_R8(press, myThid) |
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#ifdef SEAICE_ALLOW_EVP |
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_EXCH_XY_R8(seaice_div , myThid) |
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_EXCH_XY_R8(seaice_tension, myThid) |
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_EXCH_XY_R8(seaice_shear , myThid) |
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#endif /* SEAICE_ALLOW_EVP */ |
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#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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