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首页> 外文期刊>Frontiers of earth science >An application of two-phase 1DV model in studying sedimentary processes on an erosional mudflat at Yangtze River Delta, China
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An application of two-phase 1DV model in studying sedimentary processes on an erosional mudflat at Yangtze River Delta, China

机译：两阶段1DV模型在研究长江三角洲冲刷性泥滩沉积过程中的应用

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摘要

A two-phase flow model for predicting sedimentation processes under wave and current conditions is presented. The model is based on solving the one-dimensional continuity and momentum equations for both fluid and solid phases through water column (1DV). The standard mixing length model is modified to take into account the buoyancy effect due to the gradient of suspended sediments near the seabed. The model is applied to study sedimentation processes on an erosional mudflat in the Yangtze River Delta, China, and intra-tide variations of flow properties and mud concentration are predicted and compared with field measurements. It was found that it is necessary to include the wave-induced shear stress in determining sediment erosion and the existence of a fluid mud layer can significantly influence both the flow structure and the distribution of sediment concentration in the water column. The turbulence dissipation induced by the fluid mud layer has the effect of increasing the duration of re-suspension during the early stage of the ebb. The overall good agreement between measured data and model results demonstrates the capability of the model.
机译：提出了一种两相流模型，用于预测波浪和电流条件下的沉积过程。该模型基于求解通过水柱（1DV）的液相和固相的一维连续性和动量方程。修改了标准混合长度模型，以考虑到由于海床附近的悬浮沉积物的梯度而产生的浮力效应。该模型被用于研究中国长江三角洲一个侵蚀性泥滩的沉积过程，并预测了潮汐流动特性和泥浆浓度的潮汐变化并将其与现场测量结果进行了比较。已经发现在确定沉积物侵蚀时必须包括波浪引起的剪切应力，并且流体泥浆层的存在会显着影响水柱的流动结构和沉积物浓度的分布。由流体泥浆层引起的湍流消散具有增加在退潮早期重新悬浮的持续时间的作用。测量数据和模型结果之间的总体良好一致性证明了模型的功能。

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