| SEDIMENT-REMOVING CAPACITY AND RIVER MOTION DYNAMICS |
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| 作者姓名： | Zhao-Yin WANG and Yongsheng WU Dept. of Hydraulic Engineering Tsinghua University & LRTCES Beijijng China Email: zywang@tsinghua.edu.cn or zywang@ sun.iheo.ac.cn Dept. of Hydraulic Engineering Tsinghua University & IRTCES Beij |
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| 作者单位： | Zhao-Yin WANG1 and Yongsheng WU2 1 Dept. of Hydraulic Engineering，Tsinghua University & LRTCES，Beijijng 100084，China Email: zywang@tsinghua.edu.cn or zywang@ sun.iheo.ac.cn 2 Dept. of Hydraulic Engineering，Tsinghua University & IRTCES，Beij |
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| 基金项目： | the Ministry of Water Resources and the National Natural Science
Foundation of China (No.59890200 & No.59425005) |
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| 摘 要： | l INTRODUCTIONT'he landscaPe is mainly shaPed by surface runoff of water through erosion and sedimentahon. mverflows cut the bed, scour the banks and silt the seas. All these are realized by moving sediment frOm oneplace to other places. The caPacity of the flow to remove sediment frOm one place to other places within ariver chanel is called sediment-removing caPacity. It differs frOm the well-defined sediment-capingcapacity For instance, steady flow carries sediment through the river …
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SEDIMENT-REMOVING CAPACITY AND RIVER MOTION DYNAMICS |
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| Zhao-Yin WANG and Yongsheng WU Dept. of Hydraulic Engineering,Tsinghua University & LRTCES,Beijijng ,China Email: zywang@tsinghua.edu.cn or zywang@ sun.iheo.ac.cn Dept. of Hydraulic Engineering,Tsinghua University & IRTCES,Beij.SEDIMENT-REMOVING CAPACITY AND RIVER MOTION DYNAMICS[J].International Journal of Sediment Research,2001,16(2). |
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| Authors: | Zhao-Yin WANG Yongsheng WU |
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| Abstract: | Unsteady flow in fluvial rivers scours or deposits sediment, and exhibits sediment-removing capacity, which is defined as the capacity of the flow to remove sediment from per unit length of a river channel to other places per time. Differing from the well-defined sediment-carrying capacity, which is the feature of the mean flow and explains how much sediment load the flow can transport through the channel, the sediment-removing capacity is the feature of unsteady, non-equilibrium flow and represents the capability of the flow to change the channel shape and location. Measurement of the sediment-removing capacity was performed at 12 cross sections of the wandering lower Yellow River. Analysis demonstrates that the removing capacity depends mainly on the fluctuation intensity of the flow discharge. The power spectrum of discharge is presented with Fourier transformation and it revealed the mechanism of high measurement frequency-high sediment removing capacity. The movement of a river channel within the fluvial plain is defined as the river motion. The patterns of river motion are aggradation, degradation, widening, translation, rotation, wandering, bifurcation, and migration from one channel to another channel. The speed of the river motion is given as a function of the sediment-removing capacity. |
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| Keywords: | Sediment-removing capacity River motion Fluctuation intensity of flow discharge Power spectrum Lower Yellow River |
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