多向不规则波在三维透镜地形上的破碎指标研究

Study on the multidirectional irregular wave breaking indices of three-dimensional lens topography

为了研究地形不均匀性对波浪破碎的影响,通过物理模型试验,对正向、斜向和多向不规则波在三维透镜地形上的破碎指标进行研究。将试验结果与二维地形的计算公式进行对比,从而研究两种地形上破碎指标的区别。结果表明:受透镜地形的波浪聚焦作用,三维透镜地形的破碎指标大于现有公式的计算值。进一步基于现有破碎指标的通用形式对试验数据进行拟合,给出了适用于三维透镜地形上破碎指标计算公式中的参数。研究结果可为工程设计提供依据。

In order to study the effects of topographic inhomogeneity on wave breaking process,a series of experiments were conducted with normal,oblique and multidirectional irregular waves breaking on three-dimensional lens topography to study the breaker indices.The existing formulas of wave breaking on two-dimensional topography were compared with the experimental results to study the differences of breaker indices of the two topographies.The results showed that the values of breaker indices of three-dimensional lens topography were larger than the calculated values,which was caused by the wave focusing effect of lens topography.Further,the general forms of existing formulas were used to fit the experimental data and the parameters in the calculation formula of the crushing index suitable for three-dimensional lens topography were given.The results can provide the basis for engineering designing.