This study examines the multiple layers in a rubble mound breakwater and their effect on reflection and dissipation of incoming ocean waves. The numerical model is developed using multi-domain boundary element method for oblique water wave trapping near a sloping wall by a multi-layered trapezoidal porous structure, which is utilized to model armour, filter and core layers while examining the hydrodynamics in different configurations. Both, the constant element and linear element approaches to boundary element method are discussed. The cases of bottom-standing porous structures as being submerged and fully extended are considered. The wave hydrodynamics over the structure is described by the reflection and dissipation coefficients along with the forces acting on the sloping wall, and is influenced by wave and structural parametrics of the system. The influence of armour layer in different configurations is highlighted for various structural and wave parameters.

中文翻译：

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斜刚性壁附近多层梯形防波堤陷波的边界元法

这项研究检查了碎石堆防波堤中的多层结构及其对传入海浪的反射和消散的影响。该数值模型是使用多域边界元方法开发的，用于通过多层梯形多孔结构在倾斜壁附近捕获斜水波，用于模拟装甲层、过滤层和核心层，同时检查不同配置的流体动力学。讨论了边界元法的常元法和线性元法。考虑了底部多孔结构被淹没和完全伸展的情况。结构上的波浪流体动力学由反射和耗散系数以及作用在斜壁上的力来描述，并受系统的波浪和结构参数的影响。