台风浪风暴潮作用下三维潮流数值模拟

Numerical simulation of 3-D tidal current under the actions of typhoon waves and storm surge

针对台风作用下三维潮流模拟的技术问题,本文提出了波流耦合的三维潮流数值模拟技术。首先,基于三重网格嵌套的超高分辨率的韦帕台风风场,应用第三代波浪模型、二维潮流模型、三维水动力泥沙模型FVCOM和非结构化网格的二维、三维三重嵌套的方式,通过二次开发重点解决了三维模型中波生流和波流共同作用底部剪切应力的计算,并建立了台风作用下波流耦合的三维潮流数学模型。然后,模拟计算了2007年韦帕台风作用下连云港海域波流耦合的三维潮流过程。最后,对连云港港进行了不同布置方案的计算。研究结果表明:旗台港区内水流流态和流速各布置方案差异均较小;徐圩港区随着港区内围填工程面积的增大,大范围环流现象逐渐消失,流速也随之变小。研究成果可为连云港港30万吨级航道工程的设计提供技术支持。

In order to solve the problem of 3-D tidal current simulation under a typhoon,a method of numerical simulation of wave-current coupling is presented in this paper.First,based on the wind field of Typhoon Wipha in a triple-nested grid with high resolution,the following were applied:the third generation wave model;2-D tidal current model;3-D hydrodynamic and sediment model FVCOM;and the 2-D and 3-D unstructured grid triple-nested model.Through secondary development,shear stress at the bottom of the 3-D model,under the combined action of wave-current coupling,was virtually solved.A 3-D tidal current mathematical model of wave-current coupling under typhoon action was developed.Wave-current-coupled 3-D tidal current process in the Lianyungang Sea area,under the influence of Typhoon Wipha in 2007,was simulated.Finally,calculations of the different layout plans of Lianyungang port were carried out.Results showed that there was little difference in flow pattern and flow velocity for all layout plans in the Qitai port area.With increasing reclamation in the Xuwei port area,the phenomenon of large-scale rotational flow gradually disappeared,and flow velocity decreased.This data can provide technical support for the design of a 300,000 t channel project in Lianyungang port.