sediment.in

The text below shows the entries in the default sediment.in file, with links to more detailed explanation where required.

! There are 5 sections to the sediment INPUT File. 1) Sediment control switches, for nested grids. 2) Sediment Bed Model parameters. 3) Non-Cohesive sediment paramters. 4) Cohesive sediment paramters. 5) Bed layer and bottom sediment output properties.

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1) Sediment model control switch.

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Switch is used to control sediment model computation within nested and/or
multiple connected grids, [1:Ngrids].

  Lsediment == T

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2) General sediment bed model controls.

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Depositional bed layer thickness criteria to create a new layer (m). If
deposition exceeds this value, then a new layer is created, [1:Ngrids].

   NEWLAYER_THICK == 0.01d0

Bed load transport rate coefficient. [1:Ngrids].

   BEDLOAD_COEFF == 0.05d0

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3) Suspended Cohesive Sediment Parameters, [1:NCS,1:Ngrids] values expected.

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Median sediment grain diameter (mm).

   MUD_SD50 == 0.01d0  0.06d0  0.10d0

Sediment concentration (kg/m3).

   MUD_CSED == 0.0d0  0.0d0  0.0d0

Sediment grain density (kg/m3).

   MUD_SRHO == 2650.0d0  2650.0d0  2650.0d0

Particle settling velocity (mm/s).

   MUD_WSED == 0.1d0  1.0d0  2.0d0

Surface erosion rate (kg/m2/s).

   MUD_ERATE == 5.0d-5  5.0d-5  5.0d-5

Critical shear for erosion and deposition (N/m2).

   MUD_TAU_CE == 0.05d0  0.05d0  0.05d0

   Critical stress for deposition is not used.
   MUD_TAU_CD == 0.01d0  0.01d0  0.01d0

Porosity (nondimensional: 0.0-1.0):  Vwater/(Vwater+Vsed).

   MUD_POROS == 0.0d0  0.0d0  0.0d0

Lateral, harmonic and biharmonic, constant, diffusion coefficient.

   MUD_TNU2 == 0.0d0  0.0d0  0.0d0             ! m2/s
   MUD_TNU4 == 0.0d0  0.0d0  0.0d0             ! m4/s

Vertical diffusion coefficients.

  MUD_AKT_BAK == 5.0d-6  5.0d-6  5.0d-6          ! m2/s

Nudging/relaxation time scales, inverse scales will be computed
internally.

  MUD_TNUDG == 0.0d0 0.0d0 0.0d0               ! days

Morphological time scale factor (greater than or equal to 1.0). A 
value of 1.0 has no scale effect.

MUD_MORPH_FAC == 1.0d0 1.0d0 1.0d0  ! nondimensional

Logical switch (TRUE/FALSE) to activate writing of cohesive sediment
into HISTORY output file.

Hout(idmud) == T  ! suspended concentration Hout(iMfrac) == T  ! bed layer fraction Hout(iMmass) == T  ! bed layer mass Hout(iMUbld) == T  ! bed load at U-points Hout(iMVbld) == T  ! bed load at V-points

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4) Non-cohesive Sediment Parameters, [1:NNS,1:Ngrids] values expected.

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Median sediment grain diameter (mm).

  SAND_SD50 == 1.0d0

Sediment concentration (kg/m3).

  SAND_CSED == 0.0d0

Sediment grain density (kg/m3).

  SAND_SRHO == 2650.0d0

Particle settling velocity (mm/s).

  SAND_WSED == 1.0d0

Surface erosion rate (kg/m2/s).

 SAND_ERATE == 1.0d-5

Critical shear for erosion and deposition (N/m2).

SAND_TAU_CE == 0.07d0
SAND_TAU_CD == 0.02d0

Porosity (nondimensional: 0.0-1.0):  Vwater/(Vwater+Vsed).

 SAND_POROS == 0.5d0

Lateral, harmonic and biharmonic, constant, diffusion coefficient.

  SAND_TNU2 == 0.0d0                           ! m2/s
  SAND_TNU4 == 0.0d0                           ! m4/s

Vertical diffusion coefficients.

SAND_AKT_BAK == 5.0d-6  ! m2/s

Nudging/relaxation time scales, inverse scales will be computed
internally.

 SAND_TNUDG == 0.0d0                           ! days

Morphological time scale factor (greater than or equal to 1.0). A
value of 1.0 has no scale effect.

SAND_MORPH_FAC == 1.0d0 1.0d0 1.0d0  ! nondimensional

Logical switches (TRUE/FALSE) to activate writing of non-cohesive
sediment into HISTORY output file.

Hout(idsand) == T  ! suspended concentration Hout(iSfrac) == T  ! bed layer fraction Hout(iSmass) == T  ! bed layer mass Hout(iSUbld) == T  ! bed load at U-points Hout(iSVbld) == T  ! bed load at V-points

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5) Bed layer and bottom sediment parameters, [1:Ngrids] values expected.

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Hout(ithck) == T                               ! sediment layer thickness
Hout(iaged) == T                               ! sediment layer age
Hout(iporo) == T                               ! sediment layer porosity
Hout(idiff) == F                               ! biodiffusivity