浙江沿海超强台风作用下的风暴潮流

Storm-tide Current Due to Super Typhoon Attack on the Coastal Region of Zhejiang Province

应用河口海岸水动力模型,利用浙江沿海包括2场超强台风在内的5场台风作用下发生的风暴潮位过程验证了该数值模式的适用性。将1949年以来登陆我国大陆沿海最强的"5612"号台风作为典型的超强台风,计算了超强台风在浙北至浙南3个不同地点登陆时产生的风暴潮流,结果显示风暴潮流一般小于天文潮潮流与基于海平面风暴海流的线性叠加值,风暴潮流场更多地呈现风暴海流的流场特点,在开敞海岸基本顺岸流动,这对于分析航道骤淤和海岸带物质输移具有重要意义。

A numerical model of the coupling effect by both astronomical tide and storm surge based on Mike21 is applied to the coastal region of Zhejiang province. The model is used to simulate the tidal water level processes with less errors during 5typhoons, including 2 super typhoons, landed in the province. The “5612”super typhoon is used as typical super typhoon, which is the most intensive typhoon landed in China. and The storm-tide currents were calculated if super typhoon is landing by 3 designed routes from north to south, and the result shows that storm-tide current is less than linear imposition of astronomical current with storm current; storm-tide current field has more characters of storm current field; storm-tide current flows along the coastal line in open sea, which is more important for the study of material transport and abrupt sedimentation of navigation channel.