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C $Header: /u/gcmpack/MITgcm/pkg/flt/flt_runga2.F,v 1.13 2009/02/10 21:30:21 jmc Exp $ |
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C $Name: $ |
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|
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#include "FLT_OPTIONS.h" |
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|
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SUBROUTINE FLT_RUNGA2 ( |
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I myTime, myIter, myThid ) |
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|
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C ================================================================== |
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C SUBROUTINE FLT_RUNGA2 |
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C ================================================================== |
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C o This routine steps floats forward with second order Runge-Kutta |
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C |
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C started: Arne Biastoch |
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C |
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C changed: 2004.06.10 Antti Westerlund (antti.westerlund@helsinki.fi) |
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C and Sergio Jaramillo (sju@eos.ubc.ca) |
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C ================================================================== |
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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 "FLT.h" |
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|
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C == routine arguments == |
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_RL myTime |
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INTEGER myIter, myThid |
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|
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C == Functions == |
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c _RL FLT_MAP_R2K |
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c EXTERNAL FLT_MAP_R2K |
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|
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C == local variables == |
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INTEGER bi, bj |
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CHARACTER*(MAX_LEN_MBUF) msgBuf |
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INTEGER ip |
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INTEGER ic, jc, kc, iG, jG |
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_RL uu, vv, u1, v1 |
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#ifdef ALLOW_3D_FLT |
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_RL ww, w1, ktz, kz, scalez |
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_RL kzlo, kzhi |
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#endif |
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_RL ix, jy, itx, jty |
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_RL scalex, scaley |
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#ifdef USE_FLT_ALT_NOISE |
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Real*8 PORT_RAND_NORM |
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#else |
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Real*8 PORT_RAND |
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#undef _USE_INTEGERS |
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#ifdef _USE_INTEGERS |
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INTEGER seed |
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seed = -1 |
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#else |
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Real*8 seed |
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seed = -1.d0 |
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#endif |
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#endif |
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|
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C == end of interface == |
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|
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#ifdef ALLOW_3D_FLT |
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kzlo = 0.5 _d 0 |
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kzhi = 0.5 _d 0 + DFLOAT(Nr) |
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#endif |
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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 ip=1,npart_tile(bi,bj) |
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|
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C If float has died move to level 0 |
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IF ( tend(ip,bi,bj).NE.-1. .AND. myTime.GT.tend(ip,bi,bj) |
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& ) THEN |
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kpart(ip,bi,bj) = 0. |
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ELSE |
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C Start integration between tstart and tend (individual for each float) |
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IF ( (tstart(ip,bi,bj).EQ.-1..OR.myTime.GE.tstart(ip,bi,bj)) |
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& .AND.( tend(ip,bi,bj).EQ.-1..OR.myTime.LE. tend(ip,bi,bj)) |
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& .AND.( iup(ip,bi,bj).NE.-3.) |
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& ) THEN |
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|
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ix = ipart(ip,bi,bj) |
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jy = jpart(ip,bi,bj) |
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ic=NINT(ix) |
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jc=NINT(jy) |
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kc=NINT(kpart(ip,bi,bj)) |
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|
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scalex=recip_dxF(ic,jc,bi,bj) |
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scaley=recip_dyF(ic,jc,bi,bj) |
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iG = myXGlobalLo + (bi-1)*sNx + ic-1 |
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jG = myYGlobalLo + (bj-1)*sNy + jc-1 |
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|
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#ifdef ALLOW_3D_FLT |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
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c kz=global2local_k(kpart(ip,bi,bj),bi,bj,mjtyhid) |
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|
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C recip_drF is in units 1/r (so IF r is in m this is in 1/m) |
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scalez=rkSign*recip_drF(kc) |
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C We should not do any special conversions for kz, since flt_trilinear |
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C expects it to be just a normal kpart type variable. |
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kz=kpart(ip,bi,bj) |
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CALL FLT_TRILINEAR(ix,jy,kz,uu,uVel,1,bi,bj,myThid) |
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CALL FLT_TRILINEAR(ix,jy,kz,vv,vVel,2,bi,bj,myThid) |
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CALL FLT_TRILINEAR(ix,jy,kz,ww,wVel,4,bi,bj,myThid) |
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ELSE |
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#else /* ALLOW_3D_FLT */ |
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IF ( .TRUE. ) THEN |
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#endif /* ALLOW_3D_FLT */ |
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CALL FLT_BILINEAR(ix,jy,uu,uVel,kc,1,bi,bj,myThid) |
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CALL FLT_BILINEAR(ix,jy,vv,vVel,kc,2,bi,bj,myThid) |
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ENDIF |
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|
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C When using this alternative scheme the noise probably should not be added twice. |
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#ifndef USE_FLT_ALT_NOISE |
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IF (iup(ip,bi,bj).NE.-2.) THEN |
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uu = uu + uu*(PORT_RAND(seed)-0.5)*flt_noise |
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vv = vv + vv*(PORT_RAND(seed)-0.5)*flt_noise |
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#ifdef ALLOW_3D_FLT |
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#ifdef ALLOW_FLT_3D_NOISE |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
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ww = ww + ww*(PORT_RAND(seed)-0.5)*flt_noise |
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ENDIF |
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#endif |
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#endif /* ALLOW_3D_FLT */ |
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ENDIF |
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#endif |
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|
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C ix and itx are in indices. Therefore it is necessary to multiply |
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C with a grid scale factor. |
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|
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itx=ix+0.5*flt_deltaT*uu*scalex |
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jty=jy+0.5*flt_deltaT*vv*scaley |
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|
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C Second step |
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|
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#ifdef ALLOW_3D_FLT |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
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ktz=kz+0.5*flt_deltaT*ww*scalez |
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CALL FLT_TRILINEAR(itx,jty,ktz,u1,uVel,1,bi,bj,myThid) |
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CALL FLT_TRILINEAR(itx,jty,ktz,v1,vVel,2,bi,bj,myThid) |
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CALL FLT_TRILINEAR(itx,jty,ktz,w1,wVel,4,bi,bj,myThid) |
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ELSE |
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#else /* ALLOW_3D_FLT */ |
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IF ( .TRUE. ) THEN |
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#endif /* ALLOW_3D_FLT */ |
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CALL FLT_BILINEAR(itx,jty,u1,uVel,kc,1,bi,bj,myThid) |
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CALL FLT_BILINEAR(itx,jty,v1,vVel,kc,2,bi,bj,myThid) |
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ENDIF |
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|
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IF (iup(ip,bi,bj).NE.-2.) THEN |
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#ifdef USE_FLT_ALT_NOISE |
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u1 = u1 + port_rand_norm()*flt_noise |
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v1 = v1 + port_rand_norm()*flt_noise |
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#ifdef ALLOW_3D_FLT |
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#ifdef ALLOW_FLT_3D_NOISE |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
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w1 = w1 + port_rand_norm()*flt_noise |
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ENDIF |
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#endif |
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#endif /* ALLOW_3D_FLT */ |
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|
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#else /* USE_FLT_ALT_NOISE */ |
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u1 = u1 + u1*(PORT_RAND(seed)-0.5)*flt_noise |
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v1 = v1 + v1*(PORT_RAND(seed)-0.5)*flt_noise |
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#ifdef ALLOW_3D_FLT |
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#ifdef ALLOW_FLT_3D_NOISE |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
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w1 = w1 + w1*(PORT_RAND(seed)-0.5)*flt_noise |
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ENDIF |
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#endif |
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#endif /* ALLOW_3D_FLT */ |
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|
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#endif /* USE_FLT_ALT_NOISE */ |
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ENDIF |
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|
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C ipart is in coordinates. Therefore it is necessary to multiply |
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C with a grid scale factor divided by the number grid points per |
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C geographical coordinate. |
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ipart(ip,bi,bj) = ipart(ip,bi,bj) |
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& + flt_deltaT*u1*scalex |
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jpart(ip,bi,bj) = jpart(ip,bi,bj) |
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& + flt_deltaT*v1*scaley |
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#ifdef ALLOW_3D_FLT |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
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kpart(ip,bi,bj) = kpart(ip,bi,bj) |
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& + flt_deltaT*w1*scalez |
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ENDIF |
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#endif /* ALLOW_3D_FLT */ |
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|
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#ifdef ALLOW_3D_FLT |
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C If float is 3D, make sure that it remains in water |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
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C reflect on surface |
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IF (kpart(ip,bi,bj).LT.kzlo) kpart(ip,bi,bj)=kzlo |
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& +kzlo-kpart(ip,bi,bj) |
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C stop at bottom |
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IF (kpart(ip,bi,bj).GT.kzhi) kpart(ip,bi,bj)=kzhi |
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ENDIF |
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#endif /* ALLOW_3D_FLT */ |
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ENDIF |
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ENDIF |
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|
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C- end ip loop |
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ENDDO |
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C- end bi,bj loops |
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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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