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On the mechanisms of the saltating motion of bedload

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International Journal of Sediment Research 2017年第1期32卷 53-59页

作者： Youhua Chen Yuchuan Bai Dong Xu State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Jinchang Water Conservancy Department

Saltation of sediment particles is an important pattern of bedload *** on force analysis for sediment particles,a Lagrangian model was proposed for the saltating motion of bedload in river flows,which was then solved with numerical *** results on the saltating trajectories neglecting particle rotation and turbulence effects compare fairly well with experimental *** mean values of the saltation parameters(saltation height,length and velocity) also agree well with the previous experimental *** on the numerical results,regression equations for the dimensionless saltation height,length and velocity were *** the numerically achieved characteristics of the sediment saltation,we also obtained mathematical expression for the sediment transport *** studies in this paper are significant for its contribution to mechanism of the bedload motion and the computation of sediment transport rate.

关键词： Bedload Saltation Numerical model transport rate

Experimental study on bed-load sediment transport under irregular wave and current combined flow

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Acta Oceanologica Sinica 2001年第2期20卷 271-280页

作者： Wu Yongsheng,Qin Chongren (1. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China 2. School of Civil Engineering, Tianjin University, Tianjin 300072, China) Department of Hydraulic Engineering Tsinghua University Beijing 100084 China

Using an irregularly oscillating tray and flume, a series of experiments are completed to evaluate bed-load sediment transport rate under irregular wave -current coexistent field. Testing conditions include three interaction angles 0', 45', 90' and two kinds of median sizes (0.38 and 1.10 mm). The results of transport rate show that the net sediment transport rate can be expressed approximately as the function of the maximum bottom shear stress of waves, mean shear stress of current and the grain size.

关键词： Irregular wave-current bed-load transport rate

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ADVANCES IN MEASURING TECHNIQUES OF BED LOAD

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泥沙研究 1997年第1期 40-47页

作者： ZHOU Gangyan 1 ZOU Jiazhong 2

ＡＤＶＡＮＣＥＳＩＮＭＥＡＳＵＲＩＮＧＴＥＣＨＮＩＱＵＥＳＯＦＢＥＤＬＯＡＤＺＨＯＵＧａｎｇｙａｎ１ＺＯＵＪｉａｚｈｏｎｇ２ＡＢＳＴＲＡＣＴＢｅｄｌｏａｄｉｓａｎｉｍｐｏｒｔａｎｔｃｏｍｐｏｎｅｎｔｏｆｔｏｔａｌｌｏ... 详细信息

ＡＤＶＡＮＣＥＳＩＮＭＥＡＳＵＲＩＮＧＴＥＣＨＮＩＱＵＥＳＯＦＢＥＤＬＯＡＤＺＨＯＵＧａｎｇｙａｎ１ＺＯＵＪｉａｚｈｏｎｇ２ＡＢＳＴＲＡＣＴＢｅｄｌｏａｄｉｓａｎｉｍｐｏｒｔａｎｔｃｏｍｐｏｎｅｎｔｏｆｔｏｔａｌｌｏａｄｔｒａｎｓｐｏｒｔａｔｉｏｎ．...

关键词： Bed load measurement Sampling efficiency Measuring error Sediment discharge transport rate

ADVANCES IN MEASURING TECHNIQUES OF BED LOAD

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International Journal of Sediment Research 1997年第1期 34-41页

作者： ZHOU Gangyan ZOU Jiazhong (1 The English text is edited and altered by Mr. Long Yuqian. 2 Senior engineer, Hydrology Bureau, Changjiang Water Resources Comm., Wuhan 430010, P. R. China. 3 Senior engineer (High grade), Hydrology Bureau, Changjiang Water Re

Bed load is an important component of total load transportation. The accuracy of bed load measurement depends on the measuring equipment and sampling method. In this paper, the present situation of bed load measurement is introduced, the structure features and the sampling performance of bed lead samplers currently used in the world is evaluated. Results of field comparison of HS and TR2 type samplers used in USA, Don type sampler used in former USSR, and Chinese made Y78-1, Y80, AWT160, MB2 samplers have been summarized. From statistical point of view, selection of sampling verticals, and duration and number of repetitions in a vertical in the bed load measurement were studied. The error might be minimized if the sampling verticals were selected on the basis of equal partial bed load discharge. Finally, some data processing methods are recommended, which have been applied to the Changjiang River.

关键词： Bed load measurement Sampling efficiency Measuring error Sediment discharge transport rate