群桩式波浪能装置附近水沙动力特性及其对岸滩演变影响研究

成本和效率是困扰波浪能发电装置商业化运营的重要技术障碍，将波浪能发电装置与防波堤等海岸建筑物结合是一种降低波浪发电成本的有效途径。本项目拟考虑一种桩柱式振荡水柱(OWC)波浪能装置与群桩式防波堤结合的多功能OWC桩式防波堤。其波浪发电功能可为大陆岸线或岛礁供电，而防波堤功能则可提供岸滩防护，改善极端波浪下的岸滩侵蚀。该装置涉及到波浪作用下群桩附近的水动力学和泥沙动力学的相关物理过程，特别需要考虑OWC装置造成的结构截面变化的影响。现有文献在该领域尚未有系统、完备的相关理论体系和观测描述，本项目拟围绕揭示波浪作用下不同截面紧凑布置群桩附近的流场和泥沙冲刷特征、分析极端波浪条件下的多功能OWC桩式防波堤的岸滩防护效益并建立波浪与紧凑布置群桩相互作用的水动力和泥沙动力学数值模型的目标，开展多项物模和数值试验，为采用桩式波浪能装置阵列实现发电和岸滩防护综合效益提供必要的科学依据和参考。

Commercial application of wave energy devices faces the challenge of cost and efficiency issues, it has been proved that a combination between wave energy devices and other coastal structure such as breakwaters is beneficial for the reduction of wave power cost via cost sharing. This proposal proposes a study related to a type of pile-style OWC wave energy converter incorporated with a pile breakwater consisting of an array of closely spaced OWC-piles. Its wave power production could serve as important power source for coastlines or remote islands, while its wave sheltering function could help protect coastlines from erosion during extreme weather. Understanding the performance of such a device entails understanding its underlying hydrodynamic and sediment transport characteristics in a wave field, particularly, the effect of the presence of the OWC devices in the pile members over these characteristics. These physical processes have not been systematically studied and characterized before. In the proposed study, it is intended to carry out a series of wave flume experiments and numerical studies to unveil the detailed flow structure and scour pattern around an OWC-pile breakwater under the impact of waves, and analyze the effect of such a structure on coastal erosion during extreme weather, furthermore, during the process of aforementioned studies, to establish a numerical model suitable for simulation of hydrodynamics and sediment transport around an OWC-pile breakwater. Eventually, it is expected that the findings in this study could provide useful scientific evidence and reference for the development of integrated wave power farming and coastal management projects.