Hindered settling velocity of cohesive/non-cohesive sediment mixtures
Hindered settling velocity of cohesive/non-cohesive sediment mixtures
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DOI：
10.1016/j.coastaleng.2008.05.001
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发表时间：
2008-12-01
影响因子：
4.4
通讯作者：
Davies, Peter
中科院分区：
文献类型：
--
作者：
Cuthbertson, Alan;Dong, Ping;Davies, Peter
本文提出了一种新的方法来预测含泥沙和泥絮体混合物的浓悬浮液所遇到的受阻沉降条件。这些方法，基于两部分配方，通过考虑适用于粘性/非粘性混合物的泥絮体和砂粒的单分散和多分散固体颗粒悬浮液的沉降特性。这些预测方法的行为进行了评估，在广泛的混合物条件下，并与现有的配方相比，其参数依赖于相对体积浓度和絮凝物/颗粒大小的泥和砂成分建立。结果表明，充分回流的影响所产生的两个馏分的考虑提供了最好的建模框架，预测受阻沉降条件在很宽的范围内的砂泥混合物。(C)2008 Elsevier B. V.保留所有权利。
New methods are proposed for predicting the hindered settling conditions encountered by concentrated suspensions containing mixtures of sand particles and mud flocs. These methods, based on two-fraction formulations, are developed by consideration of the settling characteristics of monodisperse and polydisperse solid particle suspensions applied to cohesive/non-cohesive mixtures of mud flocs and sand particles. The behaviour of these predictive methods is evaluated over a wide range of mixture conditions and compared with existing formulations, with their parametric dependence on the relative volumetric concentrations and floc/particle sizes for the mud and sand constituents established. The results indicate that consideration of the full return flow effects generated by both fractions provides the best modelling framework for predicting the hindered settling conditions over a wide range of sand-mud mixtures. (C) 2008 Elsevier B.V. All rights reserved.