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CALSND.for
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CALSND.for
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SUBROUTINE CALSND
C
C CHANGE RECORD
C ** SUBROUTINE CALSND CALCULATES NONCOHESIVER SEDIMENT SETTLING,
C ** DEPOSITION AND RESUSPENSION AND IS CALLED FOR SSEDTOX
C
USE GLOBAL
IMPLICIT NONE
REAL::TIME,GRADSED,SIGP,CRNUM,DUM1,DUM3,DUM4,DIASED3
REAL::FSEDMODE,CSNDZEQ,ZEQMIN,CSNDEQC,CSHIELDS,TMPVAL
REAL::CSNDSET,SHIELDS,TOP,BOT,WSFAC,WESE,WESEMX
REAL::PROBDEP,WSETMP,WVEL,CLEFT,CRIGHT,SNDBTMP,SEDAVG
REAL::AA11,AA12,AA21,AA22,BB11,BB22,DETI,FLUXFAC
INTEGER::NX,NS,K,L,ISGPFLAG,ISEHFLAG,KTOP,NXX,NSS,IFLAG,LN
C
C**********************************************************************C
C
IF(ISDYNSTP.EQ.0)THEN
TIME=(DT*FLOAT(N)+TCON*TBEGIN)/TCON
ELSE
TIME=TIMESEC/TCON
ENDIF
C
C**********************************************************************C
C
C ** SET MAXIMUM NONCOHESIVE SEDIMENT DIAMETER
C
SNDDMX=0.
IF(ISTRAN(7).GE.1)THEN
DO NX=1,NSND
NS=NSED+NX
SNDDMX=MAX(SNDDMX,SEDDIA(NS))
ENDDO
ENDIF
C
C**********************************************************************C
C
C ** SET NONCOHESIVE ARMORING PARAMETERS
C
IF(ISTRAN(7).GE.1)THEN
C
IF(ISNDAL.EQ.0)THEN
C
DO K=1,KB
DO L=2,LA
SIGPHI(L,K)=0.
ENDDO
ENDDO
C
DO NX=1,NSND
DO L=2,LA
PEXP(L,NX)=1.
PHID(L,NX)=1.
ENDDO
ENDDO
C
ENDIF
C
IF(ISNDAL.GE.1)THEN
C
ISGPFLAG=0
ISEHFLAG=0
DO NX=1,NSND
NS=NX+NSED
IF(ISNDEQ(NS).EQ.1)ISGPFLAG=1
IF(ISBDLD(NS).GE.2)ISEHFLAG=1
ENDDO
C
C ** SET SIGPHI FOR GARCIA AND PARKER (1991) EQS 46 AND 47
C
IF(ISGPFLAG.EQ.1)THEN
C
C ** GP - CONVERT SEDIMENT DIAMETERS IN M TO MM AND SET PHI SIZE
C
DO NX=1,NSND
NS=NSED+NX
SEDPHI(NS)=-LOG(1000.*SEDDIA(NS))/LOG(2.)
ENDDO
C
C ** GP - SET MEAN PHI FOR TOP LAYER OF BED
C
DO L=2,LA
TVAR3W(L)=0.
TVAR3E(L)=0.
SIGPHI(L,KBT(L))=0.
ENDDO
C
DO NX=1,NSND
NS=NSED+NX
DO L=2,LA
KTOP=KBT(L)
TVAR3W(L)=TVAR3W(L)+SEDPHI(NS)*VFRBED(L,KTOP,NS)
TVAR3E(L)=TVAR3E(L)+VFRBED(L,KTOP,NS)
ENDDO
ENDDO
C
DO L=2,LA
IF(TVAR3E(L).LE.0.) TVAR3E(L)=1.
TVAR3W(L)=TVAR3W(L)/TVAR3E(L)
ENDDO
C
DO NX=1,NSND
NS=NSED+NX
DO K=1,KB
DO L=2,LA
KTOP=KBT(L)
SIGPHI(L,KTOP)=SIGPHI(L,K)+((SEDPHI(NS)-TVAR3W(L))**2)
& *VFRBED(L,KTOP,NS)/TVAR3E(L)
ENDDO
ENDDO
ENDDO
C
DO L=2,LA
KTOP=KBT(L)
IF(SIGPHI(L,KTOP).LT.0.)THEN
SIGPHI(L,KTOP)=-SQRT(ABS(SIGPHI(L,KTOP))) ! *** PMC TEMP PATCH
ELSE
SIGPHI(L,KTOP)=SQRT(SIGPHI(L,KTOP))
ENDIF
ENDDO
C
ENDIF
C
C ** END CALCULATION OF SIGPHI FOR GARCIA AND PARKER (1991)
C
C ** SET EXPOSURE AND HIDING FUNCTIONS FOR ENGULAND-HANSEN AND WU,WANG,
C
IF(ISEHFLAG.EQ.1.OR.ISGPFLAG.EQ.1)THEN
C
DO NX=1,NSND
DO L=2,LA
PEXP(L,NX)=0.0
PHID(L,NX)=0.0
ENDDO
ENDDO
C
DO L=2,LA
SNDBT(L,KBT(L))=0.0
ENDDO
C
DO NX=1,NSND
NS=NSED+NX
DO L=2,LA
K=KBT(L)
SNDBT(L,K)=SNDBT(L,K)+SNDB(L,K,NX)
DO NXX=1,NSND
NSS=NSED+NXX
PEXP(L,NX)=PEXP(L,NX)+SNDB(L,K,NXX)*SEDDIA(NS)
& /(SEDDIA(NS)+SEDDIA(NSS))
PHID(L,NX)=PHID(L,NX)+SNDB(L,K,NXX)*SEDDIA(NSS)
& /(SEDDIA(NS)+SEDDIA(NSS))
ENDDO
ENDDO
ENDDO
C
DO NX=1,NSND
DO L=2,LA
K=KBT(L)
IF(SNDBT(L,K).GT.0.0) THEN
PEXP(L,NX)=PEXP(L,NX)/SNDBT(L,K)
PHID(L,NX)=PHID(L,NX)/SNDBT(L,K)
ELSE
PEXP(L,NX)=1.0
PHID(L,NX)=1.0
END IF
ENDDO
ENDDO
C DO L=2,LA
C WRITE(8,888)IL(L),JL(L),(PEXP(L,NX),NX=1,NSND),
C & (PHID(L,NX),NX=1,NSND)
C ENDDO
C
ENDIF
C
C ** END SET EXPOSURE AND HIDING FUNCTIONS FOR ENGULAND-HANSEN
C
ENDIF
C
ENDIF
C
888 FORMAT(2I5,6E12.4)
C
C**********************************************************************C
C
C ** SET CRITICAL SHILED'S PARAMETER FOR D50
C
DO L=2,LA
CALL SETSHLD(DUM1,CSHIELDS50(L),SEDDIA50(L,KBT(L)),
& SSG(NSED+1),DUM3,DUM4)
ENDDO
C
C**********************************************************************C
C
C ** NONCOHESIVE SEDIMENT, KC=1 (SINGLE LAYER IN VERTICAL)
C
IF(ISTRAN(7).GE.1.AND.KC.EQ.1)THEN
DO NX=1,NSND
NS=NX+NSED
DSEDGMM=1./(1.E6*SSG(NS))
DIASED=SEDDIA(NS)
DIASED3=3.*DIASED
GPDIASED=G*(SSG(NS)-1.)*DIASED
C
C----------------------------------------------------------------------C
C
C ** SET SETTLING VELOCITIES
C
K=0
C
IF(ISNDVW.EQ.0)THEN
DO L=2,LA
WSETA(L,K,NS)=WSEDO(NS)
ENDDO
ENDIF
C
IF(ISNDVW.GE.1)THEN
DO L=2,LA
WSETA(L,K,NS)=WSEDO(NS)*
& CSNDSET(SNDT(L,K+1),SDEN(NS),ISNDVW)
ENDDO
ENDIF
C
IF(IROUSE(NX).EQ.0)THEN
DO L=2,LA
IF(USTAR(L).GT.0.0) THEN
ROUSE(L)=WSETA(L,0,NS)/(VKC*USTAR(L))
ELSE
ROUSE(L)=250000.*WSETA(L,0,NS)
END IF
ENDDO
ELSE
DO L=2,LA
IF(USTARSND(L).GT.0.0) THEN
ROUSE(L)=WSETA(L,0,NS)/(VKC*USTARSND(L))
ELSE
ROUSE(L)=250000.*WSETA(L,0,NS)
END IF
ENDDO
ENDIF
C
C----------------------------------------------------------------------C
C
DO L=1,LC
QSBDLDP(L)=0.
QSBDLDX(L,NX)=0.
QSBDLDY(L,NX)=0.
QSBDLDOT(L,NX)=0.
QSBDLDIN(L,NX)=0.
SNDFBL(L,NX)=0.
RBPSBL(L)=1.0
ENDDO
C
CALL BEDLOAD(NX,NS)
C
C----------------------------------------------------------------------C
C
C ** SUSPENDED TRANSPORT HORIZONTAL LOOP
C
DO L=2,LA
FACSUSL(L)=FSEDMODE(WSETA(L,0,NS),USTAR(L),USTARSND(L),
& RSNDM(NX),ISNDM1(NX),ISNDM2(NX),2)
ENDDO
C
C ** SET EQUILIBRUIM CONCENTRATION HEIGHT & INVERSE
DO L=2,LA
ZEQ(L)=CSNDZEQ(DIASED,GPDIASED,TAUR(NS),TAUBSND(L),
& SEDDIA50(L,KBT(L)),HP(L),ISNDEQ(NS),SSG(NS),WSETA(L,0,NS))
ZEQMIN=0.5*DZC(1)
ZEQ(L)=MIN(ZEQ(L),ZEQMIN)
ZEQI(L)=1./ZEQ(L)
ENDDO
C
C ** SET EQUILIBRUIM CONCENTRATION
DO L=2,LA
SNDEQB(L)=CSNDEQC(DIASED,SSG(NS),WSETA(L,0,NS),TAUR(NS),
& TAUBSND(L),SEDDIA50(L,KBT(L)),SIGPHI(L,KBT(L)),ZEQ(L),
& ISNDEQ(NS),ISNDAL)
ENDDO
C
C ** APPLIED LIMITOR TO GARCIA AND PARKER
C
IF(ISNDEQ(NS).EQ.1)THEN
IF(ISLTAUC(NS).EQ.1)THEN
CSHIELDS=TCSHIELDS(NS)
DO L=2,LA
IF(ISEDEFF.EQ.2)THEN
TMPVAL=1.+(COEHEFF2-1.)
& *( 1.-EXP(-COEHEFF*FRACCOH(L,KBT(L))) )
CSHIELDS=TMPVAL*CSHIELDS
ENDIF
SHIELDS=TAUBSND(L)/GPDIASED
IF(SHIELDS.LT.CSHIELDS) SNDEQB(L)=0.
ENDDO
ENDIF
IF(ISLTAUC(NS).EQ.2)THEN
DO L=2,LA
CSHIELDS=SEDDIA50(L,KBT(L))*CSHIELDS50(L)/DIASED
IF(ISEDEFF.EQ.2)THEN
TMPVAL=1.+(COEHEFF2-1.)
& *( 1.-EXP(-COEHEFF*FRACCOH(L,KBT(L))) )
CSHIELDS=TMPVAL*CSHIELDS
ENDIF
SHIELDS=TAUBSND(L)/GPDIASED
IF(SHIELDS.LT.CSHIELDS) SNDEQB(L)=0.
ENDDO
ENDIF
IF(ISLTAUC(NS).EQ.3)THEN
DO L=2,LA
CSHIELDS=0.03*((PHID(L,NX)/PEXP(L,NX))**0.6)
IF(ISEDEFF.EQ.2)THEN
TMPVAL=1.+(COEHEFF2-1.)
& *( 1.-EXP(-COEHEFF*FRACCOH(L,KBT(L))) )
CSHIELDS=TMPVAL*CSHIELDS
ENDIF
SHIELDS=TAUBSND(L)/GPDIASED
IF(SHIELDS.LT.CSHIELDS) SNDEQB(L)=0.
ENDDO
ENDIF
ENDIF
C
IF(ISEDEFF.EQ.1)THEN
DO L=2,LA
SNDEQB(L)=SNDEQB(L)*EXP(-COEHEFF*FRACCOH(L,KBT(L)))
ENDDO
ENDIF
C
DO L=2,LA
IF(ROUSE(L).LT.0.999.OR.ROUSE(L).GT.1.001)THEN
TOP=(ZEQ(L)**(ROUSE(L)-1.))-1.
BOT=(1.-ROUSE(L))*(ZEQI(L)-1.)
SNDEQ(L)=SNDEQB(L)*TOP/BOT
SNDEQ(L)=FACSUSL(L)*VFRBED(L,KBT(L),NS)*MAX(SNDEQ(L),0.)
SNDEQSAV(L,NX)=SNDEQ(L)
ELSE
TOP=LOG(ZEQI(L))
BOT=(ZEQI(L)-1.)
SNDEQ(L)=SNDEQB(L)*TOP/BOT
SNDEQ(L)=FACSUSL(L)*VFRBED(L,KBT(L),NS)*MAX(SNDEQ(L),0.)
SNDEQSAV(L,NX)=SNDEQ(L)
ENDIF
ENDDO
C
DO L=2,LA
SNDF(L,1,NX)=0.
PROBDEP=0.
WESE=0.
C ** SET MAXIMUM EROSION RATE
WESEMX=DELTI*CTMPDRY(L)*SNDB(L,KBT(L),NX)-SNDFBL(L,NX)
WESEMX=MAX(WESEMX,0.)
C ** SET RESUSPENSION FLUX
WSFAC=2.*(1.+ROUSE(L))/(2.+ROUSE(L)*(1.-ZEQ(L)))
WESE=WSFAC*CTMPDRY(L)*WSETA(L,0,NS)*SNDEQ(L)
C ** SET DEPOSITION VELOCITY
WSETMP=WSFAC*WSETA(L,0,NS)
WVEL=DELT*HPI(L)*DZIC(1)
CLEFT=1.+WSETMP*WVEL
CRIGHT=MAX(SND(L,1,NX),0.)+(WESE-SNDF(L,1,NX))*WVEL
SND(L,1,NX)=CRIGHT/CLEFT
SNDF(L,0,NX)=-WSETMP*SND(L,1,NX)+WESE
SNDBTMP=SNDB(L,KBT(L),NX)-DELT*SNDF(L,0,NX)
& -DELT*SNDFBL(L,NX)
C ** ADDED BED LOAD FLUX TO SUSPENDED LOAD FLUX WITH ABOVE LINE
IF(SNDBTMP.LT.0.0)THEN
! *** PMC Begin Block
! *** Adjust bedload flux, trying to keep suspended load flux constant
SNDBTMP=SNDB(L,KBT(L),NX)-DELT*SNDF(L,0,NX)
LN=LNC(L)
IF(SNDBTMP.LT.0.0)THEN
! *** Zero Bedload Outflux
QSBDLDX(L,NX)=MAX(QSBDLDX(L,NX),0.0)
QSBDLDY(L,NX)=MAX(QSBDLDY(L,NX),0.0)
QSBDLDX(L+1,NX)=MIN(QSBDLDX(L+1,NX),0.0)
QSBDLDY(LN,NX)=MIN(QSBDLDY(LN,NX),0.0)
QSBDLDOT(L ,NX)=0.
SNDFBL(L,NX)=DXYIP(L)*(QSBDLDX(L+1,NX)
& -QSBDLDX(L,NX)+QSBDLDY(LN,NX)-QSBDLDY(L,NX)
& +QSBDLDOT(L,NX)-QSBDLDIN(L,NX))
! *** Reduce Suspended Load Flux
SNDF(L,0,NX)=DELTI*SNDB(L,KBT(L),NX)
SND(L,1,NX)=SNDS(L,1,NX)+(SNDF(L,0,NX)-
& SNDF(L,1,NX))*WVEL
ELSE
! *** Reduce Bedload Flux
SNDBTMP=SNDBTMP/DELT
FLUXFAC=SNDBTMP/SNDFBL(L,NX)
IF(QSBDLDX(L,NX).LT.0.)
& QSBDLDX(L,NX)=FLUXFAC*QSBDLDX(L,NX)
IF(QSBDLDY(L,NX).LT.0.)
& QSBDLDY(L,NX)=FLUXFAC*QSBDLDY(L,NX)
QSBDLDOT(L ,NX)=FLUXFAC*QSBDLDOT(L ,NX)
! *** Update final Bedload Flux
SNDFBL(L,NX)=SNDBTMP-QSBDLDIN(L ,NX)
ENDIF
SNDBTMP=0.0
! *** PMC End Block
ENDIF
SNDB1(L,KBT(L),NX)=S3TL*SNDB(L,KBT(L),NX)
& +S2TL*SNDB1(L,KBT(L),NX)
SNDB(L,KBT(L),NX)=SNDBTMP
SNDF(L,0,NX)=SNDF(L,0,NX)+SNDFBL(L,NX)
QSBDTOP(L)=QSBDTOP(L)+DSEDGMM*SNDF(L,0,NX)
QWBDTOP(L)=QWBDTOP(L)+DSEDGMM*
& ( VDRBED(L,KBT(L))*MAX(SNDF(L,0,NX),0.)
& +VDRDEPO(NS)*MIN(SNDF(L,0,NX),0.) )
ENDDO
C
C----------------------------------------------------------------------C
C
ENDDO
ENDIF
C
C**********************************************************************C
C
C ** NONCOHESIVE SEDIMENT, KC=2 (TWO LAYERS IN VERTICAL)
C
IF(ISTRAN(7).GE.1.AND.KC.EQ.2)THEN
DO NX=1,NSND
NS=NX+NSED
DSEDGMM=1./(1.E6*SSG(NS))
DIASED=SEDDIA(NS)
DIASED3=3.*DIASED
GPDIASED=G*(SSG(NS)-1.)*DIASED
C
C----------------------------------------------------------------------C
C
C ** SET SETTLING VELOCITIES
C
IF(ISNDVW.EQ.0)THEN
DO K=0,KS
DO L=2,LA
WSETA(L,K,NS)=WSEDO(NS)
ENDDO
ENDDO
ENDIF
C
IF(ISNDVW.GE.1)THEN
DO K=0,KS
DO L=2,LA
WSETA(L,K,NS)=WSEDO(NS)*
& CSNDSET(SNDT(L,K+1),SDEN(NS),ISNDVW)
ENDDO
ENDDO
ENDIF
C
IF(IROUSE(NX).EQ.0)THEN
DO L=2,LA
IF(USTAR(L).GT.0.0) THEN
ROUSE(L)=WSETA(L,0,NS)/(VKC*USTAR(L))
ELSE
ROUSE(L)=250000.*WSETA(L,0,NS)
END IF
ENDDO
ELSE
DO L=2,LA
IF(USTARSND(L).GT.0.0) THEN
ROUSE(L)=WSETA(L,0,NS)/(VKC*USTARSND(L))
ELSE
ROUSE(L)=250000.*WSETA(L,0,NS)
END IF
ENDDO
ENDIF
C
C----------------------------------------------------------------------C
C
DO L=1,LC
QSBDLDP(L)=0.
QSBDLDX(L,NX)=0.
QSBDLDY(L,NX)=0.
QSBDLDOT(L,NX)=0.
QSBDLDIN(L,NX)=0.
SNDFBL(L,NX)=0.
RBPSBL(L)=1.0
ENDDO
C
CALL BEDLOAD(NX,NS)
C
C----------------------------------------------------------------------C
C
C ** HORIZONTAL LOOPS
C
K=2
DO L=2,LA
SNDF(L,K,NX)=0.
WVEL=DELT*HPI(L)*DZIC(K)
CLEFT=1.+WSETA(L,K-1,NS)*WVEL
CRIGHT=MAX(SND(L,K,NX),0.)
SND(L,K,NX)=CRIGHT/CLEFT
SNDF(L,K-1,NX)=-WSETA(L,K-1,NS)*SND(L,K,NX)
ENDDO
C
DO L=2,LA
FACSUSL(L)=FSEDMODE(WSETA(L,0,NS),USTAR(L),USTARSND(L),
& RSNDM(NX),ISNDM1(NX),ISNDM2(NX),2)
ENDDO
C
DO L=2,LA
PROBDEP=0.
WESE=0.
C ** SET MAXIMUM EROSION RATE
WESEMX=DELTI*CTMPDRY(L)*SNDB(L,KBT(L),NX)-SNDFBL(L,NX)
WESEMX=MAX(WESEMX,0.)
C ** SET ROUSE PARAMETER AND EQUILIBRUIM CONCENTRATION
ZEQ(L)=CSNDZEQ(DIASED,GPDIASED,TAUR(NS),TAUBSND(L),
& SEDDIA50(L,KBT(L)),HP(L),ISNDEQ(NS),SSG(NS),WSETA(L,0,NS))
ZEQMIN=0.5*DZC(1)
ZEQ(L)=MIN(ZEQ(L),ZEQMIN)
ZEQD(L)=ZEQ(L)/DZC(1)
ZEQDI(L)=1./ZEQD(L)
WSFAC=1.
SIGP=SIGPHI(L,KBT(L))
SNDEQB(L)=CSNDEQC(DIASED,SSG(NS),WSETA(L,0,NS),TAUR(NS),
& TAUBSND(L),SEDDIA50(L,KBT(L)),SIGP,ZEQ(L),ISNDEQ(NS)
& ,ISNDAL)
C
C ** APPLIED LIMITOR TO GARCIA AND PARKER
C
IF(ISNDEQ(NS).EQ.1)THEN
IF(ISLTAUC(NS).EQ.1)THEN
CSHIELDS=TCSHIELDS(NS)
IF(ISEDEFF.EQ.2)THEN
TMPVAL=1.+(COEHEFF2-1.)
& *( 1.-EXP(-COEHEFF*FRACCOH(L,KBT(L))) )
CSHIELDS=TMPVAL*CSHIELDS
ENDIF
SHIELDS=TAUBSND(L)/GPDIASED
IF(SHIELDS.LT.CSHIELDS) SNDEQB(L)=0.
ENDIF
IF(ISLTAUC(NS).EQ.2)THEN
CSHIELDS=SEDDIA50(L,KBT(L))*CSHIELDS50(L)/DIASED
IF(ISEDEFF.EQ.2)THEN
TMPVAL=1.+(COEHEFF2-1.)
& *( 1.-EXP(-COEHEFF*FRACCOH(L,KBT(L))) )
CSHIELDS=TMPVAL*CSHIELDS
ENDIF
SHIELDS=TAUBSND(L)/GPDIASED
IF(SHIELDS.LT.CSHIELDS) SNDEQB(L)=0.
ENDIF
IF(ISLTAUC(NS).EQ.3)THEN
CSHIELDS=0.03*((PHID(L,NX)/PEXP(L,NX))**0.6)
IF(ISEDEFF.EQ.2)THEN
TMPVAL=1.+(COEHEFF2-1.)
& *( 1.-EXP(-COEHEFF*FRACCOH(L,KBT(L))) )
CSHIELDS=TMPVAL*CSHIELDS
ENDIF
SHIELDS=TAUBSND(L)/GPDIASED
IF(SHIELDS.LT.CSHIELDS) SNDEQB(L)=0.
ENDIF
ENDIF
C
IF(ISEDEFF.EQ.1)
& SNDEQB(L)=SNDEQB(L)*EXP(-COEHEFF*FRACCOH(L,KBT(L)))
C
IF(ROUSE(L).LT.0.999.OR.ROUSE(L).GT.1.001)THEN
TOP=(ZEQD(L)**(ROUSE(L)-1.))-1.
BOT=(1.-ROUSE(L))*(ZEQDI(L)-1.)
SNDEQ(L)=SNDEQB(L)*TOP/BOT
SNDEQ(L)=FACSUSL(L)*VFRBED(L,KBT(L),NS)*MAX(SNDEQ(L),0.)
ELSE
TOP=LOG(ZEQDI(L))
BOT=(ZEQDI(L)-1.)
SNDEQ(L)=SNDEQB(L)*TOP/BOT
SNDEQ(L)=FACSUSL(L)*VFRBED(L,KBT(L),NS)*MAX(SNDEQ(L),0.)
ENDIF
C ** SET RESUSPENSION FLUX
WESE=WSFAC*CTMPDRY(L)*WSETA(L,0,NS)*SNDEQ(L)
C ** SET DEPOSITION VELOCITY
WSETMP=WSFAC*WSETA(L,0,NS)
WVEL=DELT*HPI(L)*DZIC(1)
CLEFT=1.+WSETMP*WVEL
CRIGHT=MAX(SND(L,1,NX),0.)+(WESE-SNDF(L,1,NX))*WVEL
SND(L,1,NX)=CRIGHT/CLEFT
SNDF(L,0,NX)=-WSETMP*SND(L,1,NX)+WESE
SNDBTMP=SNDB(L,KBT(L),NX)-DELT*SNDF(L,0,NX)
& -DELT*SNDFBL(L,NX)
C ** ADDED BED LOAD FLUX TO SUSPENDED LOAD FLUX WITH ABOVE LINE
IF(SNDBTMP.LT.0.0)THEN
! *** PMC Begin Block
! *** Adjust bedload flux, trying to keep suspended load flux constant
SNDBTMP=SNDB(L,KBT(L),NX)-DELT*SNDF(L,0,NX)
LN=LNC(L)
IF(SNDBTMP.LT.0.0)THEN
! *** Zero Bedload Outflux
QSBDLDX(L,NX)=MAX(QSBDLDX(L,NX),0.0)
QSBDLDY(L,NX)=MAX(QSBDLDY(L,NX),0.0)
QSBDLDX(L+1,NX)=MIN(QSBDLDX(L+1,NX),0.0)
QSBDLDY(LN,NX)=MIN(QSBDLDY(LN,NX),0.0)
QSBDLDOT(L ,NX)=0.
SNDFBL(L,NX)=DXYIP(L)*(QSBDLDX(L+1,NX)
& -QSBDLDX(L,NX)+QSBDLDY(LN,NX)-QSBDLDY(L,NX)
& +QSBDLDOT(L,NX)-QSBDLDIN(L,NX))
! *** Reduce Suspended Load Flux
SNDF(L,0,NX)=DELTI*SNDB(L,KBT(L),NX)
SND(L,1,NX)=SNDS(L,1,NX)+(SNDF(L,0,NX)-
& SNDF(L,1,NX))*WVEL
ELSE
! *** Reduce Bedload Flux
SNDBTMP=SNDBTMP/DELT
FLUXFAC=SNDBTMP/SNDFBL(L,NX)
IF(QSBDLDX(L,NX).LT.0.)
& QSBDLDX(L,NX)=FLUXFAC*QSBDLDX(L,NX)
IF(QSBDLDY(L,NX).LT.0.)
& QSBDLDY(L,NX)=FLUXFAC*QSBDLDY(L,NX)
QSBDLDOT(L ,NX)=FLUXFAC*QSBDLDOT(L ,NX)
! *** Update final Bedload Flux
SNDFBL(L,NX)=SNDBTMP-QSBDLDIN(L ,NX)
ENDIF
SNDBTMP=0.0
! *** PMC End Block
ENDIF
SNDB1(L,KBT(L),NX)=S3TL*SNDB(L,KBT(L),NX)
& +S2TL*SNDB1(L,KBT(L),NX)
SNDB(L,KBT(L),NX)=SNDBTMP
SNDF(L,0,NX)=SNDF(L,0,NX)+SNDFBL(L,NX)
QSBDTOP(L)=QSBDTOP(L)+DSEDGMM*SNDF(L,0,NX)
QWBDTOP(L)=QWBDTOP(L)+DSEDGMM*
& ( VDRBED(L,KBT(L))*MAX(SNDF(L,0,NX),0.)
& +VDRDEPO(NS)*MIN(SNDF(L,0,NX),0.) )
ENDDO
C
C----------------------------------------------------------------------C
C
C ** ANTI-DIFFUSION OF NONCOHESIVE SEDIMENT KC.EQ.2
C
IF(ISTOPT(7).EQ.1)THEN
C
DO L=2,LA
CRNUM=1.+DELT*WSETA(L,1,NS)*HPI(L)*DZIC(KC)
GRADSED=(SND(L,KC,NX)-SND(L,1,NX))/(DZC(KC)+DZC(1))
SEDAVG=0.5*(SND(L,KC,NX)+SND(L,KC,NX)+1.E-16)
WSETA(L,1,NS)=-CRNUM*DZC(KC)*WSETA(L,1,NS)*GRADSED/SEDAVG
ENDDO
C
DO L=2,LA
AA11=DELTI*DZC(1)*HP(L)-MIN(WSETA(L,1,NS),0.)
AA12=-MAX(WSETA(L,1,NS),0.)
AA21=MIN(WSETA(L,1,NS),0.)
AA22=DELTI*DZC(KC)*HP(L)+MAX(WSETA(L,1,NS),0.)
BB11=DELTI*DZC(1)*HP(L)*SND(L,1,NX)
BB22=DELTI*DZC(KC)*HP(L)*SND(L,KC,NX)
DETI=1./(AA11*AA22-AA12*AA21)
SND(L,1,NX)=DETI*( BB11*AA22-BB22*AA12 )
SND(L,KC,NX)=DETI*( AA11*BB22-AA21*BB11 )
ENDDO
C
ENDIF
C
C----------------------------------------------------------------------C
C
C ** FINAL FLUX KC=2
C
DO L=2,LA
SNDF(L,1,NX)=DELTI*DZC(KC)*HP(L)*(SND(L,KC,NX)
& -SNDS(L,KC,NX))
ENDDO
C
C----------------------------------------------------------------------C
C
ENDDO
ENDIF
C
C**********************************************************************C
C
C ** NONCOHESIVE SEDIMENT, KC=3 (THREE LAYERS IN VERTICAL)
C
IF(ISTRAN(7).GE.1.AND.KC.EQ.3)THEN
DO NX=1,NSND
NS=NX+NSED
DSEDGMM=1./(1.E6*SSG(NS))
DIASED=SEDDIA(NS)
DIASED3=3.*DIASED
GPDIASED=G*(SSG(NS)-1.)*DIASED
C
C----------------------------------------------------------------------C
C
C ** SET SETTLING VELOCITIES
C
IF(ISNDVW.EQ.0)THEN
DO K=0,KS
DO L=2,LA
WSETA(L,K,NS)=WSEDO(NS)
ENDDO
ENDDO
ENDIF
C
IF(ISNDVW.GE.1)THEN
DO K=0,KS
DO L=2,LA
WSETA(L,K,NS)=WSEDO(NS)*
& CSNDSET(SNDT(L,K+1),SDEN(NS),ISNDVW)
ENDDO
ENDDO
ENDIF
C
IF(IROUSE(NX).EQ.0)THEN
DO L=2,LA
IF(USTAR(L).GT.0.0) THEN
ROUSE(L)=WSETA(L,0,NS)/(VKC*USTAR(L))
ELSE
ROUSE(L)=250000.*WSETA(L,0,NS)
END IF
ENDDO
ELSE
DO L=2,LA
IF(USTARSND(L).GT.0.0) THEN
ROUSE(L)=WSETA(L,0,NS)/(VKC*USTARSND(L))
ELSE
ROUSE(L)=250000.*WSETA(L,0,NS)
END IF
ENDDO
ENDIF
C
C----------------------------------------------------------------------C
C
DO L=1,LC
QSBDLDP(L)=0.
QSBDLDX(L,NX)=0.
QSBDLDY(L,NX)=0.
QSBDLDOT(L,NX)=0.
QSBDLDIN(L,NX)=0.
SNDFBL(L,NX)=0.
RBPSBL(L)=1.0
ENDDO
C
CALL BEDLOAD(NX,NS)
C
C----------------------------------------------------------------------C
C
C ** HORIZONTAL LOOPS
C
K=3
DO L=2,LA
SNDF(L,K,NX)=0.
WVEL=DELT*HPI(L)*DZIC(K)
CLEFT=1.+WSETA(L,K-1,NS)*WVEL
CRIGHT=MAX(SND(L,K,NX),0.)
SND(L,K,NX)=CRIGHT/CLEFT
SNDF(L,K-1,NX)=-WSETA(L,K-1,NS)*SND(L,K,NX)
ENDDO
C
K=2
DO L=2,LA
WVEL=DELT*HPI(L)*DZIC(K)
CLEFT=1.+WSETA(L,K-1,NS)*WVEL
CRIGHT=MAX(SND(L,K,NX),0.)-SNDF(L,K,NX)*WVEL
SND(L,K,NX)=CRIGHT/CLEFT
SNDF(L,K-1,NX)=-WSETA(L,K-1,NS)*SND(L,K,NX)
ENDDO
C
DO L=2,LA
FACSUSL(L)=FSEDMODE(WSETA(L,0,NS),USTAR(L),USTARSND(L),
& RSNDM(NX),ISNDM1(NX),ISNDM2(NX),2)
ENDDO
C
DO L=2,LA
PROBDEP=0.
WESE=0.
C ** SET MAXIMUM EROSION RATE
WESEMX=DELTI*CTMPDRY(L)*SNDB(L,KBT(L),NX)-SNDFBL(L,NX)
WESEMX=MAX(WESEMX,0.)
C ** SET ROUSE PARAMETER AND EQUILIBRUIM CONCENTRATION
ZEQ(L)=CSNDZEQ(DIASED,GPDIASED,TAUR(NS),TAUBSND(L),
& SEDDIA50(L,KBT(L)),HP(L),ISNDEQ(NS),SSG(NS),WSETA(L,0,NS))
ZEQMIN=0.5*DZC(1)
ZEQ(L)=MIN(ZEQ(L),ZEQMIN)
ZEQD(L)=ZEQ(L)/DZC(1)
ZEQDI(L)=1./ZEQD(L)
WSFAC=1.
SIGP=SIGPHI(L,KBT(L))
SNDEQB(L)=CSNDEQC(DIASED,SSG(NS),WSETA(L,0,NS),TAUR(NS),
& TAUBSND(L),SEDDIA50(L,KBT(L)),SIGP,ZEQ(L),ISNDEQ(NS)
& ,ISNDAL)
C
C ** APPLIED LIMITOR TO GARCIA AND PARKER
C
IF(ISNDEQ(NS).EQ.1)THEN
IF(ISLTAUC(NS).EQ.1)THEN
CSHIELDS=TCSHIELDS(NS)
IF(ISEDEFF.EQ.2)THEN
TMPVAL=1.+(COEHEFF2-1.)
& *( 1.-EXP(-COEHEFF*FRACCOH(L,KBT(L))) )
CSHIELDS=TMPVAL*CSHIELDS
ENDIF
SHIELDS=TAUBSND(L)/GPDIASED
IF(SHIELDS.LT.CSHIELDS) SNDEQB(L)=0.
ENDIF
IF(ISLTAUC(NS).EQ.2)THEN
CSHIELDS=SEDDIA50(L,KBT(L))*CSHIELDS50(L)/DIASED
IF(ISEDEFF.EQ.2)THEN
TMPVAL=1.+(COEHEFF2-1.)
& *( 1.-EXP(-COEHEFF*FRACCOH(L,KBT(L))) )
CSHIELDS=TMPVAL*CSHIELDS
ENDIF
SHIELDS=TAUBSND(L)/GPDIASED
IF(SHIELDS.LT.CSHIELDS) SNDEQB(L)=0.
ENDIF
IF(ISLTAUC(NS).EQ.3)THEN
CSHIELDS=0.03*((PHID(L,NX)/PEXP(L,NX))**0.6)
IF(ISEDEFF.EQ.2)THEN
TMPVAL=1.+(COEHEFF2-1.)
& *( 1.-EXP(-COEHEFF*FRACCOH(L,KBT(L))) )
CSHIELDS=TMPVAL*CSHIELDS
ENDIF
SHIELDS=TAUBSND(L)/GPDIASED
IF(SHIELDS.LT.CSHIELDS) SNDEQB(L)=0.
ENDIF
ENDIF
C
IF(ISEDEFF.EQ.1)
& SNDEQB(L)=SNDEQB(L)*EXP(-COEHEFF*FRACCOH(L,KBT(L)))
C
IF(ROUSE(L).LT.0.999.OR.ROUSE(L).GT.1.001)THEN
TOP=(ZEQD(L)**(ROUSE(L)-1.))-1.
BOT=(1.-ROUSE(L))*(ZEQDI(L)-1.)
SNDEQ(L)=SNDEQB(L)*TOP/BOT
SNDEQ(L)=FACSUSL(L)*VFRBED(L,KBT(L),NS)*MAX(SNDEQ(L),0.)
ELSE
TOP=LOG(ZEQDI(L))
BOT=(ZEQDI(L)-1.)
SNDEQ(L)=SNDEQB(L)*TOP/BOT
SNDEQ(L)=FACSUSL(L)*VFRBED(L,KBT(L),NS)*MAX(SNDEQ(L),0.)
ENDIF
C ** SET RESUSPENSION FLUX
WESE=WSFAC*CTMPDRY(L)*WSETA(L,0,NS)*SNDEQ(L)
C ** SET DEPOSITION VELOCITY
WSETMP=WSFAC*WSETA(L,0,NS)
WVEL=DELT*HPI(L)*DZIC(1)
CLEFT=1.+WSETMP*WVEL
CRIGHT=MAX(SND(L,1,NX),0.)+(WESE-SNDF(L,1,NX))*WVEL
SND(L,1,NX)=CRIGHT/CLEFT
SNDF(L,0,NX)=-WSETMP*SND(L,1,NX)+WESE
SNDBTMP=SNDB(L,KBT(L),NX)-DELT*SNDF(L,0,NX)
& -DELT*SNDFBL(L,NX)
C ** ADDED BED LOAD FLUX TO SUSPENDED LOAD FLUX WITH ABOVE LINE
IF(SNDBTMP.LT.0.0)THEN
! *** PMC Begin Block
! *** Adjust bedload flux, trying to keep suspended load flux constant
SNDBTMP=SNDB(L,KBT(L),NX)-DELT*SNDF(L,0,NX)
LN=LNC(L)
IF(SNDBTMP.LT.0.0)THEN
! *** Zero Bedload Outflux
QSBDLDX(L,NX)=MAX(QSBDLDX(L,NX),0.0)
QSBDLDY(L,NX)=MAX(QSBDLDY(L,NX),0.0)
QSBDLDX(L+1,NX)=MIN(QSBDLDX(L+1,NX),0.0)
QSBDLDY(LN,NX)=MIN(QSBDLDY(LN,NX),0.0)
QSBDLDOT(L ,NX)=0.
SNDFBL(L,NX)=DXYIP(L)*(QSBDLDX(L+1,NX)
& -QSBDLDX(L,NX)+QSBDLDY(LN,NX)-QSBDLDY(L,NX)
& +QSBDLDOT(L,NX)-QSBDLDIN(L,NX))
! *** Reduce Suspended Load Flux
SNDF(L,0,NX)=DELTI*SNDB(L,KBT(L),NX)
SND(L,1,NX)=SNDS(L,1,NX)+(SNDF(L,0,NX)-
& SNDF(L,1,NX))*WVEL
ELSE
! *** Reduce Bedload Flux
SNDBTMP=SNDBTMP/DELT
FLUXFAC=SNDBTMP/SNDFBL(L,NX)
IF(QSBDLDX(L,NX).LT.0.)
& QSBDLDX(L,NX)=FLUXFAC*QSBDLDX(L,NX)
IF(QSBDLDY(L,NX).LT.0.)
& QSBDLDY(L,NX)=FLUXFAC*QSBDLDY(L,NX)
QSBDLDOT(L ,NX)=FLUXFAC*QSBDLDOT(L ,NX)
! *** Update final Bedload Flux
SNDFBL(L,NX)=SNDBTMP-QSBDLDIN(L ,NX)
ENDIF
SNDBTMP=0.0
! *** PMC End Block
ENDIF
SNDB1(L,KBT(L),NX)=S3TL*SNDB(L,KBT(L),NX)
& +S2TL*SNDB1(L,KBT(L),NX)
SNDB(L,KBT(L),NX)=SNDBTMP
SNDF(L,0,NX)=SNDF(L,0,NX)+SNDFBL(L,NX)
QSBDTOP(L)=QSBDTOP(L)+DSEDGMM*SNDF(L,0,NX)
QWBDTOP(L)=QWBDTOP(L)+DSEDGMM*
& ( VDRBED(L,KBT(L))*MAX(SNDF(L,0,NX),0.)
& +VDRDEPO(NS)*MIN(SNDF(L,0,NX),0.) )
ENDDO
C
C----------------------------------------------------------------------C
C
C ** ANTI-DIFFUSION OF NONCOHESIVE SEDIMENT KC.EQ.3
C
IF(ISTOPT(7).EQ.1)THEN
C
DO K=1,2
DO L=2,LA
CRNUM=1.+DELT*WSETA(L,K,NS)*HPI(L)*DZIC(K+1)
GRADSED=(SND(L,K+1,NX)-SND(L,K,NX))/(DZC(K+1)+DZC(K))
SEDAVG=0.5*(SND(L,K+1,NX)-SND(L,K,NX)+1.E-16)
WSETA(L,K,NS)=-CRNUM*DZC(K+1)*WSETA(L,K,NS)*GRADSED/
& SEDAVG
ENDDO
ENDDO
C
C TVAR1S=LOWER DIAGONAL
DO L=2,LA
TVAR1S(L,1)=0
ENDDO
DO K=2,KC
DO L=2,LA
TVAR1S(L,K)=MIN(WSETA(L,K-1,NS),0.)
ENDDO
ENDDO
C TVAR1N=UPPER DIAGONAL
DO L=2,LA
TVAR1N(L,KC)=0
ENDDO
DO K=1,KS
DO L=2,LA
TVAR1N(L,K)=-MAX(WSETA(L,K,NS),0.)
ENDDO
ENDDO
C TVAR1W=MAIN DIAGONAL
DO L=2,LA
TVAR1W(L,1)=DELTI*DZC(1)*HP(L)-MIN(WSETA(L,1,NS),0.)
TVAR1W(L,KC)=DELTI*DZC(KC)*HP(L)+MAX(WSETA(L,KC-1,NS),0.)
ENDDO
DO K=2,KS
DO L=2,LA
TVAR1W(L,K)=DELTI*DZC(KC)*HP(L)+MAX(WSETA(L,K-1,NS),0.)
& -MIN(WSETA(L,K,NS),0.)
ENDDO
ENDDO
C TVAR1E=RIGHT HAND SIDE
DO K=1,KC
DO L=2,LA
TVAR1E(L,K)=DELTI*DZC(KC)*HP(L)*SND(L,K,NX)
ENDDO
ENDDO
C
C TVAR3S=BET,TVAR2N=U,TVAR2S=GAM ARE WORKING ARRAYS
DO L=2,LA
TVAR3S(L)=TVAR1W(L,1)
ENDDO
DO L=2,LA
TVAR2N(L,1)=TVAR1E(L,1)/TVAR3S(L)
ENDDO
DO K=2,KC
DO L=2,LA
TVAR2S(L,K)=TVAR1N(L,K-1)/TVAR3S(L)
TVAR3S(L)=TVAR1W(L,K)-TVAR1S(L,K)*TVAR2S(L,K)
TVAR2N(L,K)=(TVAR1E(L,K)-TVAR1S(L,K)*TVAR2N(L,K-1))/
& TVAR3S(L)
ENDDO
ENDDO
DO K=KS,1,-1
DO L=2,LA
TVAR2N(L,K)=TVAR2N(L,K)-TVAR2S(L,K+1)*TVAR2N(L,K+1)
ENDDO
ENDDO
DO K=1,KC
DO L=2,LA
SND(L,K,NX)=TVAR2N(L,K)
ENDDO
ENDDO
C
ENDIF
C
C----------------------------------------------------------------------C
C
C ** FINAL FLUX KC=3
C
DO L=2,LA
SNDF(L,KC-1,NX)=DELTI*DZC(KC)*HP(L)*(SND(L,KC,NX)
& -SNDS(L,KC,NX))
ENDDO
DO L=2,LA
SNDF(L,1,NX)=DELTI*DZC(KC-1)*HP(L)*(SND(L,KC-1,NX)
& -SNDS(L,KC-1,NX))+SNDF(L,KC-1,NX)
ENDDO
C
C----------------------------------------------------------------------C
C
ENDDO
ENDIF
C
C**********************************************************************C
C
C ** NONCOHESIVE SEDIMENT, KC.GT.3 (THREE OR MORE LAYERS IN VERTICAL)
C
IF(ISTRAN(7).GE.1.AND.KC.GT.3)THEN
DO NX=1,NSND
NS=NX+NSED
DSEDGMM=1./(1.E6*SSG(NS))
DIASED=SEDDIA(NS)
DIASED3=3.*DIASED
GPDIASED=G*(SSG(NS)-1.)*DIASED
C