Numerical simulation of rip current in Jinsha Bay, Shenzhen based on XBeach model
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摘要: 金沙湾是粤港澳大湾区重要的滨海旅游景点之一，深受世界各地游客的青睐。利用XBeach模型模拟金沙湾海滩的近岸环流，研究了不同模拟波况下裂流的发生情况。结果表明，金沙湾产生裂流很大程度上受到波高和地形的影响，在年平均有效波高波况下，金沙湾沿岸无明显裂流，当入射波高超过某个阈值后，沿岸裂流风险提高。裂流的强度和离岸距离与入射波高呈正相关，波向增加不利于海滩处裂流的产生，但有利于偏斜裂流的形成，金沙湾的海滩管理者应该提高对波浪状况的预警，以降低因裂流而导致的危害。另外，由于长岬角特征，金沙湾产生的偏斜裂流的补偿流来自岬角和海滩的沿岸流，这一点需要通过后续的现场观测进行对比验证。本文的工作可为使用XBeach模型对裂流进行模拟研究提供参考。Abstract: Jinsha Bay is one of the most important tourist attractions in the Guangdong-Hong Kong-Macao Greater Bay Area and is favored by tourists from all over the world. The XBeach model is used to simulate the nearshore circulation of the Jinsha Bay, and the occurrence of rip current under different simulated wave conditions is studied. The results show that the rip current in the Jinsha Bay is largely affected by wave height and topography. Under the condition of annual mean significant wave height, there is no rip current along the Jinsha Bay. When the incident wave height exceeds a certain threshold, the risk of rip current increases. The intensity and offshore distance of the rip current are positively correlated with the incident wave height. When the wave direction is perpendicular to the coast, it is the best for the generation of rip current. The beach manager of the Jinsha Bay should improve the early warning of the wave condition in order to reduce the harm caused by the rip current. In addition, due to the characteristics of the long headland, the feeder current of the deflection rips generated by the Jinsha Bay comes from the alongshore currents of the headland and the beach. This can be verified by subsequent field observations. The work of this paper also provides some references for the domestic simulation research of rip current using XBeach model.
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图 3 金沙湾地形测深
P1、P2为站位
Fig. 3 Topographic bathymetries of the Jinsha Bay
P1 and P2 are stations
图 5 波况1下的平均水位（a）、平均有效波高（b）和流速（c）
Fig. 5 Average water level (a), average significant wave height (b), and velocity diagram (c) at wave condition 1
图 6 波况2下的平均水位（a）、平均有效波高（b）和流速（c）
Fig. 6 Average water level (a), average significant wave height (b), and velocity diagram (c) at wave condition 2
图 8 波况3下的平均水位（a）、平均有效波高（b）和流速（c）
Fig. 8 Average water level (a), average significant wave height (b), and velocity diagram (c) at wave condition 3
图 9 波况4下的平均水位（a）、平均有效波高（b）和流速（c）
Fig. 9 Average water level (a), average significant wave height (b), and velocity diagram (c) at wave condition 4
图 10 不同波高下流速大于0.2 m/s的流速
Fig. 10 Flow velocity diagram with velocity greater than 0.2 m/s under different wave heights
表 1 不同的模拟入射波条件
Tab. 1 Different simulated incident wave conditions
波况 有效波高
(Hs)/m峰值波周期
(Tp)/s峰值波角
(θp)/（°）波向 1 0.19 5 0 S 2 0.75 5 0 S 3 0.50 5 0 S 4 1.00 5 0 S 5 0.75 5 22.5 SSW 6 0.75 5 62.5 WSW 
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