海面下伸式狭缝挡板引起的规则波反射及透射

Reflection and Transmission of Regular Waves at a Surface-Pitching Slotted Barrier

采用本征值展开的方法发展了一种准线性理论,对规则表面波与海面下伸式狭缝挡板的相互作用进行了理论分析和实验研究.狭缝挡板引起的能量耗散首先采用了二次摩擦因子来模化,然后引入了一个随深度变化且依赖于波高的等效线性耗散系数对狭缝挡板处的匹配条件进行线性化处理.理论和实验的比较表明:应用提出的方法对反射和透射系数随波高变化的预测结果是令人满意的.

The interactions between regular surface waves and a surface-pitching slotted barrier axe investigated both analytically and experimentally. A quasi-linear theory was developed using the eigenfunction expansion method. The energy dissipation within the barriers was modeled by a quadratic friction factor, and an equivalent linear dissipation coefficient, which is depth-varying, wave-height dependent, was introduced to linearize the matching condition at the surface-pitching barrier. By comparison the theoretical results with laboratory experiments, it is shown that the present method can satisfactorily predict the variation of the reflection and transmission coefficients with wave height.