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cnh |
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C $Header: /u/gcmpack/models/MITgcmUV/pkg/shap_filt/shap_filt_u.F,v 1.2 2001/02/02 21:36:30 adcroft Exp $ |
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C $Name: $ |
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adcroft |
1.2 |
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#include "SHAP_FILT_OPTIONS.h" |
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SUBROUTINE SHAP_FILT_U(uVel,bi,bj,K,myCurrentTime,myThid) |
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C /==========================================================\ |
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C | S/R SHAP_FILT_U | |
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C | Applies Shapiro filter to U field over one XY slice | |
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C | of one tile at a time. | |
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C \==========================================================/ |
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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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C == Routine arguments |
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_RL uVel(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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INTEGER myThid |
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_RL myCurrentTime |
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INTEGER bi, bj, K |
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#ifdef ALLOW_SHAP_FILT |
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C == Local variables == |
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_RL tmpFldX(1-OLx:sNx+OLx,1-OLy:sNy+OLy,2) |
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_RL tmpFldY(1-OLx:sNx+OLx,1-OLy:sNy+OLy,2) |
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_RS maskZ(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER I,J,N,N1,N2 |
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DO J=1-OLy,sNy+OLy |
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DO I=1-OLx,sNx+OLx |
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tmpFldX(i,j,1) = uVel(i,j,k,bi,bj) |
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& *_maskW(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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C Extract small-scale noise from tmpFldX (delta_ii^n) |
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DO N=1,nShap |
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N1=1+mod(N+1,2) |
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N2=1+mod( N ,2) |
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DO J=1-OLy,sNy+OLy |
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DO I=1-OLx+1,sNx+OLx-1 |
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tmpFldX(i,j,N2) = -0.25*( |
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& tmpFldX(i-1,j,N1) + tmpFldX(i+1,j,N1) |
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& - 2.*tmpFldX(i,j,N1) |
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& )*_maskW(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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C Create temporary Zeta mask (accounting for thin walls) |
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DO J=1-OLy,sNy+OLy |
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DO I=1-OLx+1,sNx+OLx |
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maskZ(i,j) = _maskS(i-1,j,k,bi,bj) |
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& *_maskS( i ,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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#ifdef SEQUENTIAL_2D_SHAP |
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DO J=1-OLy,sNy+OLy |
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DO I=1-OLx,sNx+OLx |
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tmpFldX(i,j,N2) = uVel(i,j,k,bi,bj) - tmpFldX(i,j,N2) |
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tmpFldY(i,j,1) = tmpFldX(i,j,N2) |
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ENDDO |
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ENDDO |
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#else |
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DO J=1-OLy,sNy+OLy |
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DO I=1-OLx,sNx+OLx |
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tmpFldY(i,j,1) = uVel(i,j,k,bi,bj) |
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& *_maskW(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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#endif /* SEQUENTIAL_2D_SHAP */ |
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C Extract small-scale noise from tmpFldY (delta_jj^n) |
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DO N=1,nShap |
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N1=1+mod(N+1,2) |
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N2=1+mod( N ,2) |
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DO J=1-OLy+1,sNy+OLy-1 |
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DO I=1-OLx+1,sNx+OLx |
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tmpFldY(i,j,N2) = -0.25*( |
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& (tmpFldY(i,j+1,N1)-tmpFldY(i, j ,N1))*maskZ(i,j+1) |
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& -(tmpFldY(i, j ,N1)-tmpFldY(i,j-1,N1))*maskZ(i, j ) |
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#ifdef NO_SLIP_SHAP |
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& -2.*(2.-maskZ(i,j)-maskZ(i,j+1))*tmpFldY(i,j,N1) |
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#endif |
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& )*_maskW(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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C Subtract small-scale noise from field |
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#ifdef SEQUENTIAL_2D_SHAP |
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DO J=1-OLy,sNy+OLy |
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DO I=1-OLx,sNx+OLx |
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uVel(i,j,k,bi,bj) = tmpFldX(i,j,N2) - tmpFldY(i,j,N2) |
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ENDDO |
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ENDDO |
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#else |
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DO J=1-OLy,sNy+OLy |
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DO I=1-OLx,sNx+OLx |
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uVel(i,j,k,bi,bj) = uVel(i,j,k,bi,bj) |
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& -0.5*( tmpFldX(i,j,N2)+tmpFldY(i,j,N2) ) |
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ENDDO |
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ENDDO |
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#endif /* SEQUENTIAL_2D_SHAP */ |
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#endif /* ALLOW_SHAP_FILT */ |
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RETURN |
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END |
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