河口地区同时存在的波流相互作用及其与对建筑和海工装备的影响是海岸工程的重点与难点问题之一。光滑粒子水动力学（Smoothed Particle Hydrodynamics, SPH）是一种纯拉格朗日无网格法，特别适合于波流耦合问题模拟，尤其是极端波浪条件下的波流与运动结构物耦合，但相关研究极少。本研究基于上述特点，建立了一套能够模拟河口波流与运动结构物耦合问题的ISPH模型。从SPH基本离散格式出发提出并测试“二次插值更新”算法避免散度修正误差，并采用高阶时间精度格式实现高精度求解，为高精度波流耦合模拟提供算法基础保障；提出“跟随边界”的概念精确描述进出流粒子边界实现SPH明渠模拟，结合源项造波算法建立完整的ISPH数值波流水槽；结合波流与运动结构物的模型实验验证，最终实现极端波浪条件下波流与运动结构物的耦合模拟研究，为河口地区波流耦合问题提供了新的研究工具，也拓展了SPH算法的应用。

The coupling between the wave, tidal current and structures or marine equipment is an important problem in estuarine area. The Smoothed Particle Hydrodynamics (SPH) is a Lagrange based, meshless numerical method, which is a potential algorithm for wave-current interaction simulation, especially for that in extreme wave conditions and wave-structure coupling problems. However, the relevant research is still rare. As such, in this study, a new Incompressible SPH (ISPH) model is created to simulate the wave-current-moving structure coupling problems. In the model, a "secondary interpolation updating" algorithm is improved and added to increase the divergence correction accuracy; The Higher order accuracy scheme of time is employed in the time integration; A new "following particles boundary" model is presented for inflow and outflow description in open channel flow simulation. The wave-current interaction simulation is achieved by the integration of open channel flow model and source term wave maker model. A flume experiment is carried out for the verification and the model is later applied into the complex coupling between wave, current and moving structure under strong nonlinear and extreme wave conditions.