摘要
结合周期性边界条件、水流循环技术以及动量源造波方法,本文建立了一个基于光滑粒子流体动力学(smoothed particle hydrodynamic,SPH)方法的二维无反射数值波浪水槽,模拟了波浪在深海台礁上的传播变形过程,分析了该地形上波高和增水的沿程变化,并与物理模型试验结果进行了对比.结果表明,该数值模型可以较准确地模拟深海台礁上的波浪破碎和增水过程以及礁坪上波高和波浪增水的空间分布特征;在水槽左右两侧采用周期性边界条件和预留水流循环通道,能够有效解决竖向二维数值模型中由于礁坪上波生流引起的潟湖内水面的非物理性雍高及进而导致的礁坪上增水偏大的问题.
Different from the fringing reef along the coastal beach, the reef face of the deep-sea platform reef is very steep and the water depth varies rapidly from a few thousand meters at the reef toe to a few meters at the reef edge. The special geomorphology of the deep-sea platform reef makes its hydrodynamics much different from that of the fringing reef with a gentle reef-face. Besides, the wave-generated flow induced by wave breaking has a great influence on sediment movement, nutrient transport and habitats for marine organisms on the reef flat. Therefore, the knowledge of the hydrodynamics of the deep-sea platform reef is of great importance to guide the subsequent development and protection of the deep-sea platform reefs. An improved smoothed particle hydrodynamic（SPH） model using the periodic boundary conditions and a water circulation technology as well as a non-reflected momentum source wave maker is developed to study wave transformation over the deep-sea platform reef. The Favre average N-S equations along with the sub-particle scale（SPS） turbulence closure model are employed as the governing equations to describe the wave motion. The idealized model of the platform reef is composed of a reef face with a slope of 1：1 and a horizontal reef flat. To verify the SPH model, the corresponding physical model tests are also carried out in the nonlinear wave flume of the state key laboratory of coastal and offshore engineering, Dalian university of technology. A good agreement is obtained between the numerical and experimental results, which indicates the present SPH model can accurately simulate wave transformation over the deep-sea platform reef and that it also can reasonably capture the spatial distributions of wave height and wave set-up on the reef flat. In addition, the unphysical rise and fall of the water level in the lagoon and the ocean due to the overtopping on the reef-flat, which usually occur for the long-time simulation using the vertical 2 D numerical model, can be overcome by using the p
作者
温鸿杰
张向
任冰
王永学
Hongjie Wen;Xiang Zhang;Bing Ren;Yongxue Wang(State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100062, China;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China)
出处
《科学通报》
EI
CAS
CSCD
北大核心
2018年第9期865-874,共10页
Chinese Science Bulletin
基金
海岸和近海工程国家重点实验室开放基金(LP1721)
国家自然科学基金(51679032)资助
关键词
深海台礁
波浪破碎
波浪增水
SPH
周期性边界
deep-sea platform reef, wave breaking, wave set-up, SPH, periodic boundary
