Numerical Modeling of Erosion and Sedimentation Patterns in Alluvial River (Case Study: Gharasoo River in Kermanshah province)

Document Type : Research Paper

Authors

Abstract

Longtime sediment routing and determining the location of sedimentation and erosion in
rivers provide useful information for engineers to design hydraulic structures and river
management. Therefore, in the present research a computer model was developed to simulate
sediment movement in a river, in which after flow calculation at each time step, sediment continuity
equation was solved numerically to predict bed change at the same time step. After model
verification, using Meyer, Parker and Wilson equations for bed load prediction, bed variation of the
river with 18.5 km length for 5 and 10 years was calculated. Also by numerical solution of 1-D
depth average differential equation to calculate suspended load concentration the effect of
suspended load on sedimentation and erosion pattern during 5-year simulation was investigated.
The results showed that the erosion phenomenon was dominate pattern at the river reach. Also
calculated volumes of sedimentation and erosion using the Wilson equation were more than those
from the other relations. In addition the result showed with considering the effect of suspended
load, variations and amounts of sedimentation and erosion were increased. Therefore, significant
mistake would occur in prediction of sedimentation and erosion pattern in the mentioned river reach
if the effect of suspended load was not considered.

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References

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Water and Soil Science
Volume 26, Issue 3 - Serial Number 3
December 2016
Pages 35-49

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