Calculation of Bed Changes in Mountain Streams
Publication: Journal of Hydraulic Engineering
Volume 125, Issue 3
Abstract
Simulation of flow and sediment transport in mountain streams is complicated by the presence of high gradients, abrupt changes in geometry, variations in regime of flow, and large roughness elements. Most of the numerical models to predict aggradation and degradation in alluvial channels have been developed for low-gradient rivers. This paper is devoted to the development of a numerical model to calculate bed elevation and grain size distribution changes in mountain streams where the maximum bed material size is in the range of boulders. An attempt is made to validate the model by using observed field data collected upstream from a small retention dam in a Venezuelan stream. After calibration of the sediment transport equation, reasonable agreement is obtained for the variations in the grain size distribution of the bed-surface material. An additional application is presented in the Cocorotico River, a small mountain stream located in the northwest region of Venezuela, which illustrates the adaptability of the model to handle a case of coarsest-bed-material removal from the active channel and to simulate the armoring process.
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Published In
Journal of Hydraulic Engineering
Volume 125 • Issue 3 • March 1999
Pages: 263 - 270
History
Received: Jul 21, 1997
Published online: Mar 1, 1999
Published in print: Mar 1999
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