岛礁防浪建筑物水动力场数值模拟研究  

A numerical study on the hydrodynamic characteristics of wave interaction with breakwaters near a reef island

作　　者：段自豪 陈松贵 钟生 DUAN Zihao;CHEN Songgui;ZHONG Sheng(Tianjin Research Institute for Water Transport Engineering,M.O.T.,Tianjin 300456,China;College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]交通运输部天津水运工程科学研究院,天津300456 [2]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《长沙理工大学学报（自然科学版）》2023年第4期37-46,共10页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家重点研发计划项目(2022YFE0104500);中央级公益性科研院所科研创新基金项目(TKS20200204、TKS20210102、TKS20210110、TKS20230502)。

摘　　要：【目的】针对岛礁防浪建筑物的水动力场变化问题,利用数值模拟方法进行探究。【方法】采用非静压波浪数值模型SWASH模拟了筑堤岛礁的波生环流和涡量场。【结果】筑堤对模型区域内流速有较为显著的影响,当防波堤堤长越长、防波堤堤距越小时,模型区域内整体流速越小,其断面内沿岸流速的变化也越小。礁坪上方最大向岸流速和沿岸流速随防波堤堤距的增大而增大。当防波堤越靠近礁坪后方、防波堤长度越短时,裂口内的向岸流速越趋近于无堤时的流速。模型内最大涡量值随堤长和堤距的变化并不明显,但总出现在堤尾处。【结论】SWASH模型能够较好地模拟筑堤岛礁工程周围水域的流场情况,为复杂流环境下的岛礁筑堤建设提供科学依据。[Purposes]The construction of wave-sheltering structures near reef islands can alter the wave and flow boundary conditions,resulting in significant impacts on the hydrodynamic fields around these reef-channelisland systems.[Methods]In this study,a non-hydrostatic wave numerical model,SWASH,was utilized to simulate the wave-induced circulation and vorticity fields around constructed islands and reefs.[Findings]The results show that the breakwaters have a significant influence on the flow velocities within the model region.As the breakwater length increases and the distance between the breakwaters decreases,the overall flow velocity within the model region decreases,and the transverse variations within the cross-sections become smaller.The maximum onshore and cross-shore flow velocities above the reef platform increase with an increasing distance between the breakwaters.When the breakwaters are positioned closer to the rear of the reef platform and are shorter in length,the onshore flow velocity within the gap approaches the velocity when there is no breakwater.The maximum vorticity value within the model does not significantly vary with changes in the breakwater length and distance between breakwaters,but is consistently located at the tail of the breakwater.[Conclusions]This model effectively simulates the flow field around island and reef systems with constructed breakwaters,providing scientific evidence for the design and construction of breakwaters in complex flow environments.

关 键 词：珊瑚岛礁 SWASH 防波堤 环流 涡量 

分 类 号：P731[天文地球—海洋科学] U653.4[交通运输工程—港口、海岸及近海工程]