Tropical cyclone-induced coastal inundation is a potential hazard for the east coast of India. In the present study, two case studies are presented to examine the significance and importance of wave radiation stress in storm surge modeling during two extreme weather events associated with the Phailin and Hudhud cyclones. Model computations were performed using the advanced circulation (ADCIRC) model and the coupled ADCIRC + SWAN (Simulating Waves Nearshore) model for these two events. Meteorological and astronomical forcing were used to simulate the hydrodynamic fields using the ADCIRC model run in a stand-alone mode, whereas the coupled ADCIRC + SWAN model also incorporated the wave radiation stress attributed from wave breaking effects. Cyclonic wind fields were generated using the revised Holland model. Results clearly indicate an increase in the peak surge of almost 20–30% by incorporating the wave radiation stress and resulting inundation scenario in the coupled model simulation. The validation exercise showed that the coupled ADCIRC + SWAN model performed better than the ADCIRC model in stand-alone mode. Key findings from the study indicate the importance of wave-induced setup due to radiation stress gradients and also the role of the coupled model in accurately simulating storm surge and associated coastal inundation, especially along flat-bottom topography.

中文翻译：

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波浪辐射应力对风暴潮引起的洪水的影响：以印度东海岸为例

热带气旋引起的沿海淹没是印度东海岸的潜在危害。在本研究中，提出了两个案例研究，以检验波浪辐射应力在与 Phailin 和 Hudhud 气旋相关的两个极端天气事件期间风暴潮建模中的重要性和重要性。对于这两个事件，使用高级环流 (ADCIRC) 模型和耦合的 ADCIRC + SWAN（模拟近岸波）模型进行模型计算。气象和天文强迫用于使用以独立模式运行的 ADCIRC 模型来模拟水动力场，而耦合的 ADCIRC + SWAN 模型还包含归因于波浪破碎效应的波浪辐射应力。气旋风场是使用修订后的 Holland 模型生成的。结果清楚地表明，通过在耦合模型模拟中加入波浪辐射应力和由此产生的淹没情景，峰值浪涌增加了近 20-30%。验证练习表明，耦合的ADCIRC + SWAN 模型在独立模式下的性能优于ADCIRC 模型。该研究的主要发现表明，由于辐射应力梯度而引起的波浪诱导设置的重要性，以及耦合模型在准确模拟风暴潮和相关沿海洪水中的作用，尤其是沿着平底地形。