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- W2611809715 abstract "Here we consider the case of a river containing grain sizes including gravel, sand, silt and clay. We report on two series of experiments to investigate the process of bed variation toward dynamic equilibrium, as well as the evolution of the vertical structure of grain size variation in the bed. One purpose of the experiments is to obtain a deeper understanding of the process of bed variation in the case of an extremely wide range of sediment grain sizes. The framework of bed is constituted of “L-particles” which correspond to boulder or cobble sizes, and the void space between L-particles is occupied by “M-particles” and “S-particles. M-particles correspond to gravel, which can move as bedload, and S-particles correspond to sand, which can also move in suspension. The hiding effect of L-particles has a strong influence on the process of bed variation. The bed can eventually attain a characteristic state of dynamic equilibrium, such that its vertical structure beneath the bed surface is dependent upon the supply rate of M- and S-particles. Another purpose of the experiments is to obtain a better understanding of the erosion process of a clay bed caused by sand or gravel transported over it as bedload. It was found that a mixed layer consisting of clay and sand tended to form beneath the bed surface. This mixed-layer structure has great significance in terms of the erosion process of clay. The relationship between the erosion rate of clay and the supply rate of sand is important, and the erosion rate of clay takes the maximum value at some supply rate of sand." @default.
- W2611809715 created "2017-05-12" @default.
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- W2611809715 date "2017-05-06" @default.
- W2611809715 modified "2023-09-23" @default.
- W2611809715 title "Gravel Sorting and Variation of Riverbeds Containing Gravel, Sand, Silt and Clay" @default.
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- W2611809715 doi "https://doi.org/10.1002/9781118971437.ch22" @default.
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