Abstract
Sediment discharge in alluvial channels with coarse and nonuniform bed materials depends strongly on the bed surface grain size condition. Sediment discharge is very small when the bed surface is covered with armor coat, while it increases sharply when the armor coat is destroyed during flood. In this paper sediment discharge characteristics of nonuniform sand bed during the increase and decrease periods of flood discharge are discussed experimentally in connection with the grain size distribution of bed surface materials, through which the sediment discharge formula of nonuniform sand and the process of armor coat formation are also discussed.
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