波浪作用下三角锥透空圆孔人工鱼礁保滩促淤的数值模拟研究

Numerical simulation of artificial fish reefs for keeping beach and promoting siltation under wave action

开展三角锥透空圆孔人工鱼礁在波浪作用下对近岸波浪消减和岸滩演变研究,对近海砂质岸滩的保滩促淤具有重要意义。本文利用Flow-3D软件,采用边界造波法,以Stokes波理论等为基础,建立了三维数值波浪水槽。模拟结果表明:波浪作用下,礁体周围会产生上升流和回涡流;礁体的布设位置对冲刷坑的位置影响不大,冲刷坑的位置受水位影响较大,基本沿静水面对称分布;岸滩侵蚀与相对距离以及礁顶相对水深有着密切联系,在一定距离范围内侵蚀量随离岸距离的减小而增大,随着礁顶相对水深的减小而减小。

It is of great significance to study the characteristics of the convection field and the evolution of sediment under the action of artificial reefs with the action of waves.Using the boundary wave method of Flow-3D software,a three-dimensional numerical wave flume was established in this paper based on Stokes wave theory,and it was verified by experimental data.The results showed that the upwelling and vortex currents under the action of waves could occur around the reef.The location of the reef had little effect on the location of the scouring pit.The location of the scouring pit was greatly affected by the water level,which was basically symmetrically distributed along the water surface line.The coastal erosion was closely related to the relative distance.Within a certain distance,the amount of erosion increased as the distance from the shore decreased,and decreased as the reducing of the relative water depth of the reef top.