Model:GravelSandTransition: Difference between revisions
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|Country=USA | |Country=USA | ||
|Email address=parkerg@illinois.edu | |Email address=parkerg@illinois.edu | ||
|Phone=217 244-5159 | |Phone=217 244-5159 | ||
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{{Model identity | {{Model identity | ||
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|Spatial dimensions=1D | |Spatial dimensions=1D | ||
|Spatialscale=Watershed-Scale | |Spatialscale=Watershed-Scale | ||
|One-line model description=-- | |One-line model description=E-book: Calculator for evolution of long profile of river with a migrating gravel-sand transition and subject to subsidence or base level rise. | ||
|Extended model description=-- | |Extended model description=This model calculates the long profile of a river with a gravel-sand transition. The model uses two grain sizes: size Dg for gravel and size Ds for sand. The river is assumed to be in flood for the fraction of time Ifg for the gravel-bed reach and fraction Ifs for the sand-bed reach. All sediment transport is assumed to take place when the river is in flood. | ||
Gravel transport is computed using the Parker (1979) approximation of the Einstein (1950) bedload transport relation. Sand transport is computed using the total bed material transport relation of Engelund and Hansen (1967). | |||
In this simple model the gravel is not allowed to abrade. Both the gravel-bed and sand-bed reaches carry the same flood discharge Qbf. | |||
Gravel is transported as bed material in, and deposits only in the gravel-bed reach. A small residual of gravel load is incorporated into the sand at the gravel-sand transition. Sand is transported as washload in the gravel-bed reach, and as bed material load in the sand-bed reach. | |||
The model allows for depositional widths Bdgrav and Bdsand that are wider than the corresponding bankfull channel widths Bgrav and Bsand of the gravel-bed and sand-bed channels. As the channel aggrades, it is assumed to migrate and avulse to deposit sediment across the entire depositional width. For each unit of gravel deposited in the gravel-bed reach, it is assumed that Lamsg units of sand are deposited. For each unit of sand deposited on the sand-bed reach, it is assumed that Lamms units of mud are deposited. | |||
The gravel-bed reach has sinuosity Omegag and the sand-bed reach has sinuosity Omegas. | |||
Bed resistance is computed through the use of two specified constant Chezy resistance coefficients; Czg for the gravel-bed reach and Czs for the sand-bed reach. | |||
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{{Model technical information | {{Model technical information |
Revision as of 15:42, 19 October 2010
Contact
Name | Gary Parker |
Type of contact | Model developer |
Institute / Organization | University of Illinois at Urbana-Champaign |
Postal address 1 | 205 North Mathews Ave |
Postal address 2 | |
Town / City | Urbana |
Postal code | 61801 |
State | Illinois |
Country | USA"USA" is not in the list (Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, ...) of allowed values for the "Country" property. |
Email address | parkerg@illinois.edu |
Phone | 217 244-5159 |
Fax |
GravelSandTransition
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