Grain‐size characteristics of fine‐grained unflocculated sediments II:‘multi‐round’ distributions
Grain‐size characteristics of fine‐grained unflocculated sediments II:‘multi‐round’ distributions
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DOI：
10.1046/j.1365-3091.1996.d01-28.x
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发表时间：
1996-06
期刊：
影响因子：
3.5
通讯作者：
K. Kranck;P. Smith;T. Milligan
中科院分区：
文献类型：
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作者：
K. Kranck;P. Smith;T. Milligan
沉积物的粒度谱由一个“一轮”粒度分布的悬浮液的沉降描述的幂律，其中表征细粒肢的整数指数增加了一个以上的悬浮液。如果这种更好的分选沉积物，反过来，重新悬浮和沉淀，进一步分选和陡峭的肢体发生。每个再悬浮事件或“循环”以可预测的量改变分布。描述这一分选过程的方程，基于一轮方程的推导，适合于从不同位置分选良好的沉积物的粒度分析，以验证该模型。一套桑迪底质沉积物样品从芬迪湾表明，陡峭的细粒四肢的砂部分确实增加了整数步骤。
The grain-size spectrum of sediment deposited by settling of a suspension with a ‘one-round’ grain size distribution is described by a power law in which the integer exponent characterizing the fine-grained limb is increased by one over that of the suspension. If this better-sorted sediment, in turn, is resuspended and settles, further sorting and steepening of the limb occurs. Each resuspension event or‘round’changes the distribution by a predictable amount. Equations describing this sorting process, based on the derivation of the one-round equation, are fitted to grain-size analyses of well-sorted sediment from a variety of locations to verify the model. A suite of sandy bottom sediment samples from the Bay of Fundy shows that the steepness of the fine-grained limbs of the sand fraction indeed increases in integral steps.