Model help:Sedflux

From CSDMS
The CSDMS Help System

Sedflux

SEDFLUX is a basin-fill model, written in ANSI-standard C, able to simulate the delivery of sediment and their accumulation over time scales of tens of thousands of years. It simulates the dynamics of strata formation of continental margins fuse information from the atmosphere, ocean and regional geology, and it can provide information for areas and times for which actual measurements are not available, or for when purely statistical estimates are not adequate by themselves.

Model introduction

Sedflux combines individual process-response models into one fully interactive model, delivering a multi-sized sediment load onto and across a continental margin. The model allows for the deposit to compact, to undergo tectonic processes and isostatic subsidence from the sediment load. The new version, Sedflux 2.0 introduces a series of new process models, and is able to operate in one of two models to track the evolution of stratigraphy in either 2D or 3D. Additions to the 2D mode include the addition of models that simulate (1) erosion and deposition of sediment along a riverbed, (2) cross-shore transport due to ocean waves, and (3) turbidity currents and hyperpycnal flows. New processes in the 3D mode include (1) river channel avulsion, (2) two-dimensional diffusion due to ocean storms, and (3) two-dimensional flexure due to sediment loading. The spatial resolution of the architecture is typically 1–25 cm in the vertical and 10–100 m in the horizontal when operating in 2D mode. In 3D mode, the horizontal resolution usually extends to kilometers. In addition to fixed time steps (from days to hundreds of years), Sedflux 2.0 offers event-based time stepping as a way to conduct long-term simulations while still modeling low-frequency but high-energy events.

Model parameters

Parameter Description Unit
Input directory path to input files -
Site prefix site prefix for Input/Output files -
Case prefix case prefix for Input/Output files -
Parameter Description Unit
Water discharge port use the water discharge provides port -
Erosion port Use the erosion provides port -
Parameter Description Unit
Run duration simulation run time years
Grid resolution in x-direction m
Grid resolution in y-direction m
Grid resolution in z-direction m
Parameter Description Unit
Avulsion standard deviation degrees
Minimum river angle degrees
Maximum river angle degrees
Row position of river hinge point -
Column position of river hinge point -
Velocity of coastal current m / s
Suspended load concentration pre-grain suspended sediment concentration -
Distance to dump bedload -
Bed load flux bed load flux at river mouth kg / s
Parameter Description Unit
Output directory path to output grid files -
Interval between output files -
SeaFloorDepth file output file prefix for variable, in NetCDF format -
SeaFloorSlope file output file prefix for variable, in NetCDF format -
SeaFloorElevation file output file prefix for variable, in NetCDF format -
SeaFloor Thickness file output file prefix for variable, in NetCDF format -
SeaFloorGrain file output file prefix for variable, in NetCDF format -
SeaFloorAge file output file prefix for variable, in NetCDF format -
SeaFloorSand file output file prefix for variable, in NetCDF format -
SeaFloorSilt file output file prefix for variable, in NetCDF format -
SeaFloorClay file output file prefix for variable, in NetCDF format -
SeaFloorMud file output file prefix for variable, in NetCDF format -
SeaFloorFacies file output file prefix for variable, in NetCDF format -
SeaFloorDensity file output file prefix for variable, in NetCDF format -
SeaFloorPorosity file output file prefix for variable, in NetCDF format -
SeaFloorPermeability file output file prefix for variable, in NetCDF format -
SeaFloorBasement file output file prefix for variable, in NetCDF format -
SeaFloorRiver_mouth file output file prefix for variable, in NetCDF format -
Parameter Description Unit
Output directory path to output cube files -
Interval between output files -
Age file output file prefix for variable, in NetCDF format -
Facies file output file prefix for variable, in NetCDF format -
Pressure file output file prefix for variable, in NetCDF format -
Density file output file prefix for variable, in NetCDF format -
Grain_density file output file prefix for variable, in NetCDF format -
Max_density file output file prefix for variable, in NetCDF format -
Grain file output file prefix for variable, in NetCDF format -
Grain_in_meters file output file prefix for variable, in NetCDF format -
Sand file output file prefix for variable, in NetCDF format -
Silt file output file prefix for variable, in NetCDF format -
Clay file output file prefix for variable, in NetCDF format -
Mud file output file prefix for variable, in NetCDF format -
Velocity file output file prefix for variable, in NetCDF format -
Viscosity file output file prefix for variable, in NetCDF format -
Relative_density file output file prefix for variable, in NetCDF format -
Porosity file output file prefix for variable, in NetCDF format -
Porosity_min file output file prefix for variable, in NetCDF format -
Porosity_max file output file prefix for variable, in NetCDF format -
Pi file output file prefix for variable, in NetCDF format -
Permeability file output file prefix for variable, in NetCDF format -
Void_ratio file output file prefix for variable, in NetCDF format -
Void_ratio_min file output file prefix for variable, in NetCDF format -
Void_ratio_max file output file prefix for variable, in NetCDF format -
Friction_angle file output file prefix for variable, in NetCDF format -
Consolidation file output file prefix for variable, in NetCDF format -
Yield_strength file output file prefix for variable, in NetCDF format -
Dynamic_viscosity file output file prefix for variable, in NetCDF format -
Mv file output file prefix for variable, in NetCDF format -
Hydraulic_con file output file prefix for variable, in NetCDF format -
Shear_strength file output file prefix for variable, in NetCDF format -
Cohesion file output file prefix for variable, in NetCDF format -
Consolidation_rate file output file prefix for variable, in NetCDF format -
Excess_pressure file output file prefix for variable, in NetCDF format -
Relative_pressure file output file prefix for variable, in NetCDF format -
Fraction file output file prefix for variable, in NetCDF format -
Parameter Description Unit
Model name name of the model -
Author name name of the model author m

Uses ports

This will be something that the CSDMS facility will add

Provides ports

This will be something that the CSDMS facility will add

Main equations

  • River dynamics (using HydroTrend model)

1) Water discharge

(1)

2) Mean suspended load entering the ocean basin

(2)

3) Bedload equation by Bagnold (1966)

(3)
  • Channel avulsion (using Avulsion model)
(4)
  • Bedload dumping (not hyperpycnal flow)
(5)
  • River plumes

1) Advection-diffusion equation

(6)

2) Froude number

(7)

3) Plume's centerline

(8)

4) Non-conservative concentration along and surrounding the centerline position

(9)
(10)
(11)
(12)
  • Diffusion of seafloor sediments

1) Amount of bottom sediments that can be reworked by resuspension and diffusion

(13)

2) Amount and direction of transport of the ith grain size

(14)
  • Sediment failure

1) Stability of a possible failure plane

(15)

2) excess pore pressure using Gibson's graphical approximation (1958)

(16)
(17)
(18)
  • River mouth turbidity currents
(19)
(20)

Fluid continuity equation 1) one dimensional steady-state turbidity current model INFLO

(21)

Continuity equation for the ith grain size of the flow's suspeneded load

(22)

The rate of erosion of the ith grain size of the seafloor by the current

(23)

Rate of deposition of the ith grain size in the flow

(24)

Critical velocity for deposition

(25)

2) turbidity current model Sakura Governing equation

(26)
(27)
(28)
(29)
(30)
(31)
(32)
(33)
(34)
  • Debris flows

1) Depth-averaged debris flow equations (Continuity)

(35)

2) Depth-averaged debris flow equations (Momentum (shear layer))

(36)

3) Depth-averaged debris flow equations (Momentum (plug flow layer))

(37)
  • Subsidence

1) Isostatic subsidence

(38)
(39)
(40)
  • Compaction
(41)
  • Subaerial erosion and deposition by river
(42)

Diffusion coefficient

(43)
  • Cross-shore transport due to ocean storms

1) Closure depth

(44)

2) Sediment flux for the outer shelf (depth greater than hc)

(45)

3) Equation for shoaling waves

(46)

4) Komar's (1998) equation for the threshold of sediment motion

(47)

5) Near-bottom threshold velocity

(48)

6) Sediment flux within the near-shore zone (depth less than hc)

(49)
  • Flexure of the lithosphere

1) Deflection of Earth's crust

(50)

2) Flexural parameter

(51)

3) Time delay between the addition of load and the lithosphere's response

(52)

Notes

See the reference Syvitski and Hutton (2001) and Hutton and Syvitski (2008).

Examples

An example run with input parameters, BLD files, as well as a figure / movie of the output

Follow the next steps to include images / movies of simulations:

See also: Help:Images or Help:Movies

Developer(s)

Eric Hutton

References

  • Hutton, E. W. H. and Syvitski, J. P. M., 2008. Sedflux 2.0: An advanced process-response model that generates three-dimensional stratigraphy. Computer & Geosciences, 34, 1319~1337, Doi: [10.1016/j.cageo.2008.02.013].
  • Syvitski, J. P. M. and Hutton, E. W. H., 2001. 2D SEDFLUX 1.0C: an advanced process-response numerical model for the fill of marine sedimentary basins. Computer & Geosciences, 27, 731~753, Doi: [10.1016/S0098-3004(00)00139-4].

Links