| Autor: |
Correia, LuíR. P., Krishnappan, Bommanna G., Graf, Walter H., Correia, LuíR. P., Krishnappan, Bommanna G., Graf, Walter H. |
| Zdroj: |
Journal of Hydraulic Engineering; March 1992, Vol. 118 Issue: 3 p476-494, 19p |
| Abstrakt: |
A fully coupled, onedimensional river model, capable of predicting sedimenttransport and bedlevel changes under unsteady flow conditions is described. The governing equations for mass and momentum balance of sedimentwater mixture under unsteady flow conditions in natural rivers with irregular geometries, are solved simultaneously using the Preissmann fourpoint linear implicit scheme with weighting factors for space and time coordinates. The resulting system of algebraic equations is solved using a solution procedure that bridges upstream and downstream boundary nodal values by successive substitutions. The friction slope is expressed in a consistent form that allows the consideration of the changing alluvial roughness effect. The system of governing equations is explicitly coupled by introducing the term representing the rate of change of bed level. The fully coupled unsteady mobile boundary flow model FCM is applied to the classical problem of sediment deposition upstream of a dam with an arbitrary sediment hydrograph at the upstream boundary as well as to some other proofofconcept tests to demonstrate its original features. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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