The importance of wave-tide-surge interaction to coastal material transport and diffusion

This study is to combine a coastal high-resolution (2′×2′) two-way coupled wave-tide-surge numerical model (including 3 main physical mechanisms) with a material transport/diffusion model for understanding the law of material transport/diffusion. Results show that the law of material trans- port/diffusion driven by background current field simulated by the coupled wave-tide-surge model is dif- ferent from that simulated by pure tide-surge, and more different from traditional ones driven by tidal current. The coupled background current should be taken into account for the simulation.     

Wave-tide-surge coupled model simulation for Typhoon Maemi

1 IntroductionThe main reason for coupling the tide and surgehydrodynamic model with a surface wave model canbe found in the physical interactions taking place inthe surface and bottom boundary layers. During thesevere storm conditions such interactions a…     

Simulation of Storm Surge and Wave Due to Typhoon Isewan (5915)

An integrally coupled wave-tide-surge model was developed and then applied to the simulation of the wave-typhoon surge for the typhoon Isewan (typhoon Vera (5915)), which is the strongest typhoon that has struck Japan and caused incalculable damage. An integrally coupled tide-surge-wave model using identical and homogeneous meshes in an unstructured grid system was used to correctly resolve the physics of wave-circulation interaction in both models. All model components were validated independently. The storm surge and wave properties such as the surge height, the significant wave height, wave period and direction were reproduced reasonably under the meteorological forcing, which was reprocessed to be close to the observations. The resulting modeling system can be used extensively for the prediction of the storm surge and waves and the usual barotropic forecast.     

INTERACTION BETWEEN WAVES AND TIDE-SURGE MOTION AND A JOINT WAVE-TIDE SURGE MODEL

This paper describes in detail the interaction between waves, tides and storm surges and covers theeffects of wave on tides and storm surges and the influence of tides plus storm surges on waves. Some pro-blems deserving attention and improvements are put forward. And finally a combined wave-tide-surge numerical model YE-JWTSM is presented,with all relevant interaction processes considered, includ-ing wave-dependent surface wind stress and bottom-stress as well as current-induced refrac-tion and frequency shift.     

海浪和潮汐风暴潮耦合过程的数值研究

海浪和风暴潮是重要的海洋灾害。对它们的精确预测和预报对沿岸海洋灾害的风险评估及海洋工程的设计具有极其重要的社会和经济价值。过去人们本多对波浪和风暴潮单独进行预报。实际上，风既产生浪又产生风暴潮，因此它们的产生必然存在相互作用。本研究的目的就是要建立一个渤海高分辨率的双向耦合的海浪和潮汐风暴潮数值模式，研究各耦合机制的影响，以期为黄河三角洲沿岸风暴潮海浪漫堤、漫滩风险评估提供更为准确的海浪风暴潮预测预报结果。 作者在研究中基于国际上先进的第三代海浪数值模式和潮汐风暴潮模式，建立了渤海2''×2''的海浪和潮汐风暴潮耦合数值模式。耦合模式充分考虑了三个主要耦合物理机制：依赖海浪状态的表面风应力，波-流相互作用底应力和辐射应力。波浪模式主要基于国际上第三代WAM模式，并对其进行了浅水效应的改进，以包括浅水深度破碎引起的能量耗散；潮汐风暴潮模式计算中开边界考虑了10个主要分潮K1，O1，P1，Q1，M2，S2，N2，K2，Sa，Ssa。依赖海浪状态的表面风应力取自Donelan等(1993)的结果,波-流相互作用底应力取自Signell等(1990)对 Grant and Madsen(1979)简化的结果，辐射应力以海浪谱表示。耦合计算中，两个模式通过三个耦合机制双向传递所需参量。 运用胜利油田中心一号观测的2个同步浪、潮、流资料对所建的耦合模式进行了检验，并通过耦合和非耦合模式结果的对比对各耦合机制的影响效应进行分析研究。研究结果表明，不同物理机制对波高的影响主要由能量方程中以辐射应力表示的波流相互作用所决定；在波-潮耦合作用中，依赖波令的表面风应力和辐射应力对水位是正效应，而波流相互作用底应力对水位是负效应。三个物理机制的综合净效应是正，可增加水位达25cm。比较显示，耦合模式的结果无论对波高还是水位都比非耦合模式的结果好，特别在峰值处。 本研究显示耦合模式的结果将改进海浪和风暴潮的模拟精度。所建立的耦合模式将对渤海海浪和风暴潮预报精度的提高，以及为黄河三角洲近岸海浪和风暴潮灾害的风险评估，提供更可靠的参数，具有重要的价值。