波浪、水流与沙波地形的相互作用是河口海岸动力学的前沿与热点问题之一，由于室内实验模拟的困难和非线性作用机制的复杂，沙波地形上水流对波浪布拉格共振的影响机制还没有实质性的突破。本研究基于物理模型实验和理论分析，揭示海岸反射波对波浪与沙波地形布拉格共振，特别是第III类共振的影响机制；以物理模型实验为主，结合数值模拟，阐明亚临界及临界流速水流与沙波地形布拉格共振机理，明确临界状态共振所致表面波运动动力特性及稳定性；结合物理模型实验和数值模拟手段，分别探讨正反双向恒定水流和波浪共存时，沙波地形激发的布拉格共振特性。研究工作可为精细模拟河口海岸水域复杂的动力环境提供理论基础，为现代海岸防护和新型潮流能开发提供科学依据。

The interaction among wave current and ripple bed is one of the hot topics of the estuary and coastal dynamics. Due to the difficulties of the physical experiment and the complexity of the nonlinear mechanisms. There are nearly no progress for the impaction induced by current to the wave-ripple bed Bragg resonance.Based on physical experiments and theoritical analyse, the influence induced by coast-reflected wave to the wave-ripple bed interaction will be investigated firstly. Particularly, the influence to the III Bragg resonance will be focused. Then the high speed current-ripple bed resonance will be investigated via suitable experiments, in order to make clear the hydrodyanmics around limit current. At last, the mechanisms will be analzed, based on physical expeiments and numerical simulation, for the current-wave-ripple bed interactions. The corresponding results will do good to the simulation of the complex estuary and coastal hydrodynamic enviroment. It will help the improvement of new egineering techniques for the coastal prection. And it might provide a new concept for the exploriture of the tidal current.