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首页> 外文期刊>Coastal engineering >Non linear shallow water modelling of bore-driven swash: Description of the bottom boundary layer
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Non linear shallow water modelling of bore-driven swash: Description of the bottom boundary layer

机译：钻孔驱动斜盘的非线性浅水建模：底部边界层的描述

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摘要

The paper presents a simple approach to estimate the bottom shear stress in the swash zone by coupling the Non Linear Shallow Water Equations with the momentum integral equation for the bottom boundary layer. The approach allows not only the computation of the frictional dissipation term in the equations but also to have an insight into the flow structure in the water column during a swash event. The numerical results have been compared with a new set of experiments involving a single dam-break generated swash event Three different grain sizes, ranging from coarse sand to gravel, have been tested in the laboratory. A sensitivity analysis on the only calibration parameter of the model, the bed roughness, is presented and its optimal value is chosen. The numerically predicted free surface, depth averaged velocity and velocity profiles have been compared with the measured ones. Results are very good in the run-up stage, where also the bottom shear stress is well modelled. In the backwash the frictional energy dissipation is better modelled for the gravel beach than for the coarse sand one. Results show that the simple model accurately predicts the flow parameters during the swash event. Also the velocity profiles are reasonably well predicted, especially during the run-up.
机译：本文提出了一种简单的方法，通过将非线性浅水方程与底部边界层的动量积分方程相结合来估算斜流区的底部切应力。该方法不仅允许计算方程中的摩擦耗散项，而且还可以洞悉冲刷事件期间水柱中的流动结构。将数值结果与一组涉及单个溃坝产生的斜流事件的新实验进行了比较，在实验室中测试了三种不同的粒度，从粗砂到砾石。提出了对模型的唯一校准参数（床粗糙度）的灵敏度分析，并选择了最佳值。数值预测的自由表面，深度平均速度和速度曲线已与实测值进行了比较。在启动阶段，底部剪切应力也得到了很好的建模，结果非常好。在反洗中，对于砾石海滩，比对粗砂海滩，摩擦能量耗散的建模效果更好。结果表明，该简单模型可以准确预测斜流事件期间的流量参数。速度分布也可以合理地很好地预测，尤其是在加速过程中。

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