Catastrophic storm surge inundation resulted from 9417 typhoon was simulated with an numerical model of ultrahigh resolution for storm surge inundation which is based on unstructured grid and can calculate the overflow discharge. The results agree well with the observations. Three paths of south, mid and north with that of 9417 typhoon as the south-path and 30 km interval from one another were designed for a series of numerical simulations with the strength of 9417 typhoon, which show that the coastal dike in Wenzhou has enhanced the menace of storm surge and inundation on the city, and the inundation depth caused by the south path and the inundation area caused by the mid path is the most. The reason is that the obstruction and diffluence of the dike on the propagation of the storm surge from open sea at the costal waters and Oujiang river estuary multiply the water transfer into the north side of Oujiang river estuary, the north end of the estuary and its mid and upper reaches.%利用一套基于非结构网格且能计算海水漫堤溢流的超高分辨率风暴潮漫滩数值模式模拟由9417号台风特大风暴潮引起的漫滩,结果与实测吻合良好.此外,选取超强台风强度并以9417台风路径为南路径,往北每间隔30 km为中路径和北路径设计了3条台风路径,进行了一系列数值模拟得出:近岸围堤加大了风暴潮、漫滩淹没对温州的威胁,而且由南路径引起的漫滩深度和中路径引起的漫滩面积影响最大.究其原因,近岸围堤对外海风暴潮在温州近海及瓯江口传播的阻隔和分流作用,两者综合变相加大了风暴潮往瓯江口北侧海域、瓯江北口、瓯江中上游的输送量.
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