Model help:SubsidingFan: Difference between revisions
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| I<sub>f</sub> | | I<sub>f</sub> | ||
| intermittency | | flood intermittency | ||
| - | | - | ||
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| Mprint | | Mprint | ||
| number of printouts | | number of printouts | ||
| - | |||
|- | |||
| T | |||
| fan angle | |||
| degrees | |||
|- | |||
| a | |||
| coefficient in the Engelund-Hansen relation | |||
| - | |||
|- | |||
| n | |||
| exponent in the Engelund-Hansen relation | |||
| - | |||
|- | |||
| S | |||
| channel-forming Shields number (sand) | |||
| - | |||
|- | |||
| P | |||
| coefficient in Parker relation | |||
| - | |||
|- | |||
| N | |||
| exponent in Parker relation | |||
| - | |||
|- | |||
| c | |||
| critical Shields number | |||
| - | |||
|- | |||
| G | |||
| channel-forming Shields number (gravel) | |||
| - | |||
|- | |||
| R | |||
| submerged specific gracity | |||
| - | |||
|- | |||
| t | |||
| time step | |||
| yr | |||
|- | |||
| i | |||
| number of intervals per print | |||
| - | |||
|- | |||
| p | |||
| number of prints | |||
| - | | - | ||
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</div> | </div> | ||
==Notes== | ==Notes== | ||
< | For a grain size of < 2 mm the Engelund-Hansen formulation will be used for the bedload, and for a grain size of ≥ 2 mm the Parker bedload formulation will be used, aside from this the diameter is not taken into account for the calculation. | ||
In the case of a gravel bed, the wash load is assumed to be sand, and in the case of a sand bed the wash load is assumed to be silt. | |||
The initial bed is assumed to be horizontal. | |||
The downstream boundary condition is one of vanishing sediment transport, and therefore it is one of vanishing slope. | |||
Revision as of 14:21, 2 May 2011
SubsidingFan
This model is an calculator for evolution of profiles of fans in subsiding basins.
Model introduction
This model is the calculation of Sediment Deposition in a Fan-Shaped Basin, undergoing Piston-Style Subsidence.
Model parameters
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
A list of the key equations. HTML format is supported; latex format will be supported in the future
| Symbol | Description | Unit |
|---|---|---|
| Qbf | flood discharge | m3 / s |
| Qtbf,feed | upstream bed material sediment feed rate during floods | m3 / s |
| Λ | units of wash load deposited in the fan per unit material load deposited | - |
| If | flood intermittency | - |
| D | grain size of bed material | mm |
| R | submerged specific gravity of sediment (e.g. 1.65 for quartz) | - |
| Lb | basin length | m |
| θ | fan angle in degrees | deg |
| Ω | channel sinuosity | - |
| λp | bed porosity | - |
| Cz | Chezy resistance coefficient | - |
| σ | subsidence rate (must equal mean aggradation for perfect filling of hole; otherwise overfilled or underfilled ) | mm / year |
| M | number of intervals | - |
| Δt | time step | year |
| Mtoprint | number of time steps to printout | - |
| Mprint | number of printouts | - |
| T | fan angle | degrees |
| a | coefficient in the Engelund-Hansen relation | - |
| n | exponent in the Engelund-Hansen relation | - |
| S | channel-forming Shields number (sand) | - |
| P | coefficient in Parker relation | - |
| N | exponent in Parker relation | - |
| c | critical Shields number | - |
| G | channel-forming Shields number (gravel) | - |
| R | submerged specific gracity | - |
| t | time step | yr |
| i | number of intervals per print | - |
| p | number of prints | - |
Notes
For a grain size of < 2 mm the Engelund-Hansen formulation will be used for the bedload, and for a grain size of ≥ 2 mm the Parker bedload formulation will be used, aside from this the diameter is not taken into account for the calculation.
In the case of a gravel bed, the wash load is assumed to be sand, and in the case of a sand bed the wash load is assumed to be silt.
The initial bed is assumed to be horizontal.
The downstream boundary condition is one of vanishing sediment transport, and therefore it is one of vanishing slope.
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:
- Upload file: http://csdms.colorado.edu/wiki/Special:Upload
- Create link to the file on your page: [[Image:<file name>]].
See also: Help:Images or Help:Movies
Developer(s)
Name of the module developer(s)
References
Key papers
Links
Any link, eg. to the model questionnaire, etc.
