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jmc |
1.4 |
C $Header: /u/gcmpack/MITgcm/pkg/flt/flt_runga4.F,v 1.3 2011/08/31 21:32:46 jmc Exp $ |
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jahn |
1.2 |
C $Name: $ |
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jahn |
1.1 |
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#include "FLT_OPTIONS.h" |
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jmc |
1.3 |
#undef _USE_INTEGERS |
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jahn |
1.1 |
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SUBROUTINE FLT_RUNGA4 ( |
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I myTime, myIter, myThid ) |
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C ================================================================== |
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C SUBROUTINE FLT_RUNGA4 |
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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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C !USES: |
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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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#include "DYNVARS.h" |
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jahn |
1.2 |
#include "FLT_SIZE.h" |
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jahn |
1.1 |
#include "FLT.h" |
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C == routine arguments == |
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_RL myTime |
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INTEGER myIter, myThid |
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C == Functions == |
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jmc |
1.3 |
#ifdef USE_FLT_ALT_NOISE |
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Real*8 PORT_RAND_NORM |
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EXTERNAL PORT_RAND_NORM |
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#else |
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Real*8 PORT_RAND |
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EXTERNAL PORT_RAND |
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#ifdef _USE_INTEGERS |
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INTEGER seed |
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#else |
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Real*8 seed |
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#endif |
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#endif /* USE_FLT_ALT_NOISE */ |
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jahn |
1.1 |
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C == local variables == |
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INTEGER bi, bj |
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INTEGER ip |
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INTEGER ic, jc, kc, iG, jG |
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_RL u1, v1, u2, v2, u3, v3, u4, v4 |
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#ifdef ALLOW_3D_FLT |
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_RL w1, w2, w3, w4, ktz1, ktz2, ktz3, kz, scalez |
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_RL kzlo, kzhi |
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#endif |
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_RL ix, jy, itx1, jty1, itx2, jty2, itx3, jty3 |
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_RL scalex, scaley |
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jmc |
1.3 |
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C == end of interface == |
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#ifndef USE_FLT_ALT_NOISE |
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jahn |
1.1 |
#ifdef _USE_INTEGERS |
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seed = -1 |
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#else |
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seed = -1.d0 |
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#endif |
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jmc |
1.3 |
#endif /* ndef USE_FLT_ALT_NOISE */ |
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jahn |
1.1 |
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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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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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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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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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scalex=recip_dxF(ic,jc,bi,bj) |
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scaley=recip_dyF(ic,jc,bi,bj) |
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jmc |
1.3 |
iG = myXGlobalLo + (bi-1)*sNx + ic-1 |
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jahn |
1.1 |
jG = myYGlobalLo + (bj-1)*sNy + jc-1 |
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C First step |
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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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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,u1,uVel,1,bi,bj,myThid) |
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CALL FLT_TRILINEAR(ix,jy,kz,v1,vVel,2,bi,bj,myThid) |
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CALL FLT_TRILINEAR(ix,jy,kz,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(ix,jy,u1,uVel,kc,1,bi,bj,myThid) |
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CALL FLT_BILINEAR(ix,jy,v1,vVel,kc,2,bi,bj,myThid) |
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ENDIF |
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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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jmc |
1.3 |
IF ( flt_noise.NE.0. .AND. iup(ip,bi,bj).NE.-2. ) THEN |
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jahn |
1.1 |
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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ENDIF |
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jmc |
1.3 |
#endif /* ndef USE_FLT_ALT_NOISE */ |
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jahn |
1.1 |
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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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itx1=ix+0.5*flt_deltaT*u1*scalex |
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jty1=jy+0.5*flt_deltaT*v1*scaley |
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C Second step |
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#ifdef ALLOW_3D_FLT |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
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ktz1=kz+0.5*flt_deltaT*w1*scalez |
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CALL FLT_TRILINEAR(itx1,jty1,ktz1,u2,uVel, |
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& 1,bi,bj,myThid) |
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CALL FLT_TRILINEAR(itx1,jty1,ktz1,v2,vVel, |
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& 2,bi,bj,myThid) |
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CALL FLT_TRILINEAR(itx1,jty1,ktz1,w2,wVel, |
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& 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(itx1,jty1,u2,uVel, |
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& kc,1,bi,bj,myThid) |
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CALL FLT_BILINEAR(itx1,jty1,v2,vVel, |
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& kc,2,bi,bj,myThid) |
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ENDIF |
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jmc |
1.3 |
IF ( flt_noise.NE.0. .AND. iup(ip,bi,bj).NE.-2. ) THEN |
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jahn |
1.1 |
#ifdef USE_FLT_ALT_NOISE |
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jmc |
1.3 |
u2 = u2 + PORT_RAND_NORM()*flt_noise |
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v2 = v2 + PORT_RAND_NORM()*flt_noise |
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jahn |
1.1 |
#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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jmc |
1.3 |
w2 = w2 + PORT_RAND_NORM()*flt_noise |
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jahn |
1.1 |
ENDIF |
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#endif |
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#endif /* ALLOW_3D_FLT */ |
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#else /* USE_FLT_ALT_NOISE */ |
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u2 = u2 + u2*(PORT_RAND(seed)-0.5)*flt_noise |
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v2 = v2 + v2*(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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w2 = w2 + w2*(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 /* USE_FLT_ALT_NOISE */ |
| 192 |
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ENDIF |
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itx2=ix+0.5*flt_deltaT*u2*scalex |
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jty2=jy+0.5*flt_deltaT*v2*scaley |
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C Third step |
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| 199 |
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#ifdef ALLOW_3D_FLT |
| 200 |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
| 201 |
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ktz2=kz+0.5*flt_deltaT*w2*scalez |
| 202 |
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CALL FLT_TRILINEAR(itx2,jty2,ktz2,u3,uVel, |
| 203 |
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& 1,bi,bj,myThid) |
| 204 |
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CALL FLT_TRILINEAR(itx2,jty2,ktz2,v3,vVel, |
| 205 |
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& 2,bi,bj,myThid) |
| 206 |
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CALL FLT_TRILINEAR(itx2,jty2,ktz2,w3,wVel, |
| 207 |
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& 4,bi,bj,myThid) |
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ELSE |
| 209 |
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#else /* ALLOW_3D_FLT */ |
| 210 |
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IF ( .TRUE. ) THEN |
| 211 |
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#endif /* ALLOW_3D_FLT */ |
| 212 |
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CALL FLT_BILINEAR(itx2,jty2,u3,uVel, |
| 213 |
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& kc,1,bi,bj,myThid) |
| 214 |
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CALL FLT_BILINEAR(itx2,jty2,v3,vVel, |
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& kc,2,bi,bj,myThid) |
| 216 |
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ENDIF |
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jmc |
1.3 |
IF ( flt_noise.NE.0. .AND. iup(ip,bi,bj).NE.-2. ) THEN |
| 219 |
jahn |
1.1 |
#ifdef USE_FLT_ALT_NOISE |
| 220 |
jmc |
1.3 |
u3 = u3 + PORT_RAND_NORM()*flt_noise |
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v3 = v3 + PORT_RAND_NORM()*flt_noise |
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jahn |
1.1 |
#ifdef ALLOW_3D_FLT |
| 223 |
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#ifdef ALLOW_FLT_3D_NOISE |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
| 225 |
jmc |
1.3 |
w3 = w3 + PORT_RAND_NORM()*flt_noise |
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jahn |
1.1 |
ENDIF |
| 227 |
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#endif |
| 228 |
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#endif /* ALLOW_3D_FLT */ |
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#else /* USE_FLT_ALT_NOISE */ |
| 231 |
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u3 = u3 + u3*(PORT_RAND(seed)-0.5)*flt_noise |
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v3 = v3 + v3*(PORT_RAND(seed)-0.5)*flt_noise |
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#ifdef ALLOW_3D_FLT |
| 234 |
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#ifdef ALLOW_FLT_3D_NOISE |
| 235 |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
| 236 |
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w3 = w3 + w3*(PORT_RAND(seed)-0.5)*flt_noise |
| 237 |
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ENDIF |
| 238 |
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#endif |
| 239 |
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#endif /* ALLOW_3D_FLT */ |
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| 241 |
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#endif /* USE_FLT_ALT_NOISE */ |
| 242 |
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ENDIF |
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| 244 |
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itx3=ix+flt_deltaT*u3*scalex |
| 245 |
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jty3=jy+flt_deltaT*v3*scaley |
| 246 |
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| 247 |
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C Fourth step |
| 248 |
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| 249 |
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#ifdef ALLOW_3D_FLT |
| 250 |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
| 251 |
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ktz3=kz+0.5*flt_deltaT*w2*scalez |
| 252 |
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CALL FLT_TRILINEAR(itx3,jty3,ktz3,u4,uVel, |
| 253 |
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& 1,bi,bj,myThid) |
| 254 |
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CALL FLT_TRILINEAR(itx3,jty3,ktz3,v4,vVel, |
| 255 |
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& 2,bi,bj,myThid) |
| 256 |
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CALL FLT_TRILINEAR(itx3,jty3,ktz3,w4,wVel, |
| 257 |
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& 4,bi,bj,myThid) |
| 258 |
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ELSE |
| 259 |
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#else /* ALLOW_3D_FLT */ |
| 260 |
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IF ( .TRUE. ) THEN |
| 261 |
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#endif /* ALLOW_3D_FLT */ |
| 262 |
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CALL FLT_BILINEAR(itx3,jty3,u4,uVel, |
| 263 |
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& kc,1,bi,bj,myThid) |
| 264 |
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CALL FLT_BILINEAR(itx3,jty3,v4,vVel, |
| 265 |
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& kc,2,bi,bj,myThid) |
| 266 |
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ENDIF |
| 267 |
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| 268 |
jmc |
1.3 |
IF ( flt_noise.NE.0. .AND. iup(ip,bi,bj).NE.-2. ) THEN |
| 269 |
jahn |
1.1 |
#ifdef USE_FLT_ALT_NOISE |
| 270 |
jmc |
1.3 |
u4 = u4 + PORT_RAND_NORM()*flt_noise |
| 271 |
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v4 = v4 + PORT_RAND_NORM()*flt_noise |
| 272 |
jahn |
1.1 |
#ifdef ALLOW_3D_FLT |
| 273 |
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#ifdef ALLOW_FLT_3D_NOISE |
| 274 |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
| 275 |
jmc |
1.3 |
w4 = w4 + PORT_RAND_NORM()*flt_noise |
| 276 |
jahn |
1.1 |
ENDIF |
| 277 |
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#endif |
| 278 |
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#endif /* ALLOW_3D_FLT */ |
| 279 |
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| 280 |
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#else /* USE_FLT_ALT_NOISE */ |
| 281 |
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u4 = u4 + u4*(PORT_RAND(seed)-0.5)*flt_noise |
| 282 |
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v4 = v4 + v4*(PORT_RAND(seed)-0.5)*flt_noise |
| 283 |
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#ifdef ALLOW_3D_FLT |
| 284 |
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#ifdef ALLOW_FLT_3D_NOISE |
| 285 |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
| 286 |
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w4 = w4 + w4*(PORT_RAND(seed)-0.5)*flt_noise |
| 287 |
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ENDIF |
| 288 |
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#endif |
| 289 |
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#endif /* ALLOW_3D_FLT */ |
| 290 |
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| 291 |
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#endif /* USE_FLT_ALT_NOISE */ |
| 292 |
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ENDIF |
| 293 |
jmc |
1.3 |
|
| 294 |
jahn |
1.1 |
C ipart is in coordinates. Therefore it is necessary to multiply |
| 295 |
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C with a grid scale factor divided by the number grid points per |
| 296 |
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C geographical coordinate. |
| 297 |
jmc |
1.3 |
ipart(ip,bi,bj) = ipart(ip,bi,bj) + flt_deltaT/6 |
| 298 |
jahn |
1.1 |
& * (u1 + 2*u2 + 2*u3 + u4) * scalex |
| 299 |
jmc |
1.3 |
jpart(ip,bi,bj) = jpart(ip,bi,bj) + flt_deltaT/6 |
| 300 |
jahn |
1.1 |
& * (v1 + 2*v2 + 2*v3 + v4) * scaley |
| 301 |
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#ifdef ALLOW_3D_FLT |
| 302 |
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IF (iup(ip,bi,bj).EQ.-1.) THEN |
| 303 |
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kpart(ip,bi,bj) = kpart(ip,bi,bj) + flt_deltaT/6 |
| 304 |
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& * (w1 + 2*w2 + 2*w3 + w4) * scalez |
| 305 |
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ENDIF |
| 306 |
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#endif /* ALLOW_3D_FLT */ |
| 307 |
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| 308 |
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C-- new horizontal grid indices |
| 309 |
jmc |
1.4 |
ic = MAX( 1-OLx, MIN( NINT(ipart(ip,bi,bj)), sNx+OLx ) ) |
| 310 |
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|
jc = MAX( 1-OLy, MIN( NINT(jpart(ip,bi,bj)), sNy+OLy ) ) |
| 311 |
jahn |
1.1 |
|
| 312 |
|
|
#ifdef ALLOW_3D_FLT |
| 313 |
|
|
C If float is 3D, make sure that it remains in water |
| 314 |
|
|
IF (iup(ip,bi,bj).EQ.-1.) THEN |
| 315 |
|
|
C reflect on surface |
| 316 |
|
|
IF (kpart(ip,bi,bj).LT.kzlo) kpart(ip,bi,bj)=kzlo |
| 317 |
|
|
& +kzlo-kpart(ip,bi,bj) |
| 318 |
|
|
C stop at bottom |
| 319 |
|
|
IF (kpart(ip,bi,bj).GT.kzhi) kpart(ip,bi,bj)=kzhi |
| 320 |
|
|
C-to work also with non flat-bottom set-up: |
| 321 |
|
|
c IF ( kpart(ip,bi,bj).GT.kLowC(ic,jc,bi,bj)+0.5 ) |
| 322 |
|
|
c & kpart(ip,bi,bj) = kLowC(ic,jc,bi,bj)+0.5 |
| 323 |
|
|
ENDIF |
| 324 |
|
|
#endif /* ALLOW_3D_FLT */ |
| 325 |
|
|
|
| 326 |
|
|
#ifdef ALLOW_OBCS |
| 327 |
|
|
IF ( useOBCS ) THEN |
| 328 |
|
|
C-- stop floats which enter the OB region: |
| 329 |
|
|
IF ( maskInC(ic,jc,bi,bj).EQ.0. .AND. |
| 330 |
|
|
& maskC(ic,jc,1,bi,bj).EQ.1. ) THEN |
| 331 |
|
|
C for now, just reset "tend" to myTime-deltaT |
| 332 |
|
|
C (a better way would be to remove this one & re-order the list of floats) |
| 333 |
|
|
tend(ip,bi,bj) = myTime - flt_deltaT |
| 334 |
|
|
ENDIF |
| 335 |
|
|
ENDIF |
| 336 |
|
|
#endif /* ALLOW_OBCS */ |
| 337 |
|
|
|
| 338 |
|
|
ENDIF |
| 339 |
|
|
ENDIF |
| 340 |
|
|
|
| 341 |
|
|
C- end ip loop |
| 342 |
|
|
ENDDO |
| 343 |
|
|
C- end bi,bj loops |
| 344 |
|
|
ENDDO |
| 345 |
|
|
ENDDO |
| 346 |
|
|
|
| 347 |
|
|
RETURN |
| 348 |
|
|
END |
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