Wave-Tide-Surge Coupled Simulation for Typhoon Maemi

• Published in: China ocean engineering 2013-04, Vol.27 (2), p.141-158
• Main Authors: Choi, Byung Ho, Min, Byung Il, Kim, Kyeong Ok, Yuk, Jin Hee
• Format: Article
• Language: English
• Subjects: Boundary layer; Coastal Sciences; Engineering; Finite element method; Fluid- and Aerodynamics; Marine; Marine & Freshwater Sciences; Mathematical models; Numerical and Computational Physics; Ocean currents; Oceanography; Offshore Engineering; Peninsulas; Simulation; Storm surges; Surges; Typhoons; 台风暴潮; 建模系统; 浪涌; 海面粗糙度; 相互作用; 耦合模拟; 蝉; 非结构化网格
• ISSN: 0890-5487; 2191-8945
• DOI: 10.1007/s13344-013-0013-0

The main task of this study focuses on studying the effect of wave-current interaction on currents, storm surge and wind wave as well as effects of current induced wave refraction and current on waves by using numerical models which consider the bottom boundary layer and sea surface roughness parameter for shallow and smooth bed area around Korean Peninsula. The coupled system （unstructured-mesh SWAN wave and ADCIRC） run on the same unstructured mesh. This identical and homogeneous mesh allows the physics of wave-circulation interactions to be correctly resolved in both models. The unstructured mesh can be applied to a large domain allowing all energy from deep to shallow waters to be seamlessly followed. There is no nesting or overlapping of structured wave meshes, and no interpolation is required. In response to typhoon Maemi （2003）, all model components were validated independently, and shown to provide a faithful representation of the system＇s response to this storm. The waves and storm surge were allowed to develop on the continental shelf and interact with the complex nearshore environment. The resulting modeling system can be used extensively for prediction of the typhoon surge. The result show that it is important to incorporate the wave-current interaction effect into coastal area in the wave-tide-surge coupled model. At the same time, it should consider effects of depth-induced wave breaking, wind field, currents and sea surface elevation in prediction of waves. Specially, we found that： （1） wave radiation stress enhanced the current and surge elevation otherwise wave enhanced nonlinear bottom boundary layer decreased that, （2） wind wave was significantly controlled by sea surface roughness thus we cautiously took the experimental expression. The resulting modeling system can be used for hindcasting （prediction） the wave-tide-surge coupled environments at complex coastline, shallow water and fine sediment area like areas around Korean Peninsula.