波生沙纹输沙预报的改进
Toward Improving Prediction of Sediment Transport over Wave-Induced Ripples
摘要：
波浪诱导的沙纹上的泥沙输移是一个非常复杂的现象，现有的模型无法提供准确的预测。对于海岸工程应用，可使用1-DV平流-扩散方程，并增加一个与波纹上方涡旋脱落过程相关的参数α（Absi，2010年）。本研究的目的是提供简单实用的分析工具。通过湍流通道流的DNS数据验证了分析涡粘滞性分布（Absi等人，2011年）。本文的研究结果表明：（1）振荡边界层中的周期平均涡动粘性系数可以用这个简单的解析公式来描述;（2）垂直廓线的形状可以用基线（BSL）k-ω模式的周期平均涡粘滞性来验证（Suntoyo和Tanaka，2009年）;（3）垂直涡粘滞性分布取决于波浪非线性参数，因此需要特定的校准。
英文摘要：
Sediment transport over wave-induced ripples is a very complex phenomenon where available models fail to provide accurate predictions. For coastal engineering applications, the 1-DV advection-diffusion equation could be used with an additional parameter α related to the process of vortex shedding above ripples (Absi, 2010). The aim of this study is to provide simple practical analytical tools. An analytical eddy viscosity profile was validated by DNS data of turbulent channel flows (Absi et al., 2011). In this study, we will show that: (1) the period-averaged eddy viscosity in oscillatory boundary layers could be described by this simple analytical formulation; (2) The shape of the vertical profile is validated by period-averaged eddy viscosity of baseline (BSL) k-ω model (Suntoyo and Tanaka, 2009) for sinusoidal and asymmetric waves; (3) The vertical eddy viscosity profile depends on the wave non-linearity parameter and requires therefore a specific calibration.
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