聚焦波与多个潜堤相互作用的数值模拟

Numerical Simulation of Focused Wave Interaction with Multiple Submerged Breakwaters

潜堤具有促淤保滩、防波等作用,在港口、航道等工程中应用广泛;极端波浪由于其瞬时出现、波高大、破坏力强,严重影响在航道中航行船舶的安全。为分析极端波浪与潜堤的作用机理,保护航行船舶安全,本文基于非静压模型SWASH (Simulating WAves till SHore),开展聚焦波与多个潜堤相互作用的数值模拟,研究矩形潜堤高度、宽度、间距和个数对聚焦波特征参数的影响。结果表明:多个潜堤能够有效地抑制极端波浪;随着潜堤高度、宽度、间距和个数的增加,聚焦波峰值下降,聚焦位置以及时间后移;当潜堤间距与潜堤宽度所对应的共振频率相近时,随着潜堤个数的增加,聚焦波能会显著地向倍频附近转移。

Submerged breakwaters have the advantages of beach protection and siltation accretion as well as break waves, which are widely used in port and waterway projects. Extreme waves seriously affect the safety of ships sailing in the fairway due to their instantaneous appearance, high wave height and strong destructive power. Therefore, it is necessary and important to analyse the mechanism of the interaction between the extreme waves and submerged breakwaters to protect the safety of sailing ships. This paper carries out a numerical simulation of focusing waves interacting with multiple submerged breakwaters based on a non-static pressure model SWASH (Simulating WAves till SHore). The effects of height, width, spacing and number of rectangular submerged breakwaters on focused wave characteristic parameters were studied. The results show that multiple submerged breakwaters can effectively suppress extreme waves. With the increase of height, width, spacing and number of submerged breakwaters, the peak value of focused wave decreases, and the focused position as well as the focused time moves backward. When the distance between the submerged breakwaters is close to the resonance frequency corresponding to the width of the submerged breakwaters, as the number of submerged breakwaters increases, the focused wave energy will significantly transform to the second order frequency.