| CHANNEL WIDENING DURING DEGRADATION OF ALLUVIAL RIVER |
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| 作者姓名： | Guangqian WANG and Junqiang XIA Key Lab for Water and Sediment Sciences of Education Ministry Tsinghua Univ. Beijing P.R. China. |
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| 作者单位： | Guangqian WANG1 and Junqiang XIA1 1 Key Lab，for Water and Sediment Sciences of Education Ministry，Tsinghua Univ.，Beijing，100084，P.R. China. |
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| 基金项目： | the National Natural Science Foundation of China and the Ministry of
Water Resource (Grant No.59890200) |
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| 摘 要： | 1 INTRODUCTIONThe fluvial processes such as transihon of river pattrms, bank chat and advance, sedimentation anderosion of flood plains and channel beds can be Observed in alluvial rivers. These fluvial PrOcesses are allattributed to variations of the sediment caping caPacity of the flow and the erodibillty of bank matrialor soil. A river sechon may be widened by bank erosion and failure.For examPle, a river channel downstream of a reservoir is scoured because the flow released frOm the…
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CHANNEL WIDENING DURING DEGRADATION OF ALLUVIAL RIVERS |
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| Guangqian WANG and Junqiang XIA Key Lab,for Water and Sediment Sciences of Education Ministry,Tsinghua Univ.,Beijing,,P.R. China..CHANNEL WIDENING DURING DEGRADATION OF ALLUVIAL RIVER[J].International Journal of Sediment Research,2001,16(2). |
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| Authors: | Guangqian WANG Junqiang XIA |
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| Abstract: | This paper first describes the phenomenon of channel widening during degradation of alluvial rivers, explains the mechanisms of channel widening, and analyzes the stability of cohesive riverbank. Then a one-dimensional mathematical model is developed to simulate the transport of non-uniform suspended sediments, with a sub-model for the simulation of channel widening, and is used to study the process of channel widening during degradation. The effects of different incident flow and sediment conditions and different riverbank material characteristics on channel widening and bed degradation are compared. Finally, main factors that control the deformation processes are identified. |
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| Keywords: | Alluvial river Channel widening Bed degradation Cohesive soil riverbanks |
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