Channels generally contain coarser sediment than do the adjacent flood plains.
河床沉积物一般比邻近的泛滥平原沉积物粗些。
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Most of the soil in the river bed has washed down over the years from the mountains.
河床的大部分泥土都是多年来从山上冲刷下来的.
《简明英汉词典》
River banks often also have clay about one meter or less under the surface.
河床下一米或不到一米的地方也出产黏土.
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Use a trowel to collect about 1 kg of sediment from the bottom of the stream.
利用一个小铲,收集大约1000克的河床物质样本.
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Besides, a stability criterion for different river regimes has been suggested.
此外, 还专门对河床的综合稳定性指标开展了研究.
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