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首页> 外文期刊>Computers & geosciences >A simple procedure for calculating the mean and maximum bed stress under wave and current conditions for rough turbulent flow based on Soulsby and Clarke's (2005) method
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A simple procedure for calculating the mean and maximum bed stress under wave and current conditions for rough turbulent flow based on Soulsby and Clarke's (2005) method

机译：基于Soulsby和Clarke（2005）方法的简单方法，用于计算波浪和当前条件下湍流的平均和最大床层应力

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摘要

In the marine environment, particularly on continental shelves, the processes of wave dissipation and sediment transport depend crucially on the bed shear stress. When waves and currents are superimposed the bed shear stress exhibits non-linear behaviour such that it is insufficient to simply sum vectorially the wave-alone and current-alone stress components. Soulsby and Clarke (2005) [Bed shearstresses under combined waves and currents on smooth and rough beds. Report TR 137. HR Wallingford, Wallingford, UK, 22 pp.] developed a simple analytical, non-iterative method for calculating the mean and maximum bed shear stress in combined wave and current flows. For rough turbulent flow their method produces non-linearities in the mean and maximum bed stress that are consistent with those measured, while it under-predicts the non-linearities in the bed stresses in comparison with model predictions. Here their method is generalised such that it may be used to predict non-linearities in the bed stresses that are consistent with either the measurements or the models, for the case of rough turbulent flow. Also the Soulsby and Clarke method relies on the fact that the depth-averaged current is already known. However, in the field it is often the case that the current at a particular height above the bed is measured, so here their method is reposed in terms of a current measured at a particular height. A MATLAB script is provided for this modified Soulsby and Clarke method, such that either strong or weak non-linearity can be included in the wave-current interaction and the current can be input at a particular height or as a depth average.
机译：在海洋环境中，尤其是在大陆架上，波浪消散和泥沙输送的过程主要取决于床层的剪切应力。当波浪和电流叠加时，床层剪应力表现出非线性行为，以至于不能简单地矢量化单独计算波浪应力和电流应力分量。 Soulsby和Clarke（2005）[在光滑和粗糙床上，波浪和水流共同作用下的床剪应力。报告TR 137. HR Wallingford，英国Wallingford，22页。]开发了一种简单的分析，非迭代方法，用于计算波浪和电流组合中的平均和最大床层剪切应力。对于粗糙的湍流，他们的方法产生的平均和最大床应力非线性与所测得的一致，而与模型预测相比，它低估了床应力的非线性。在这里，他们的方法是通用的，可以用于预测湍流粗糙的情况下与测量值或模型一致的床层应力中的非线性。 Soulsby和Clarke方法还依赖于这样的事实，即深度平均电流是已知的。然而，在现场，通常是在床上方的特定高度处测量电流的情况，因此这里的方法是根据在特定高度处测量的电流来代替的。为此修改的Soulsby和Clarke方法提供了MATLAB脚本，因此强非线性或弱非线性都可以包含在波流相互作用中，并且可以在特定高度或深度平均值处输入电流。

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