“梅花”台风期间江苏辐射沙洲海域风暴潮增水研究

Research on storm surge during typhoon "Muifa" in radial sand ridegs off Jiangsu coast

通过建立的黄海海域天文潮与风暴潮耦合模型,分析在"梅花"(Muifa)台风作用下,江苏辐射沙洲海域流场变化及增水空间分布特征。结果表明,当台风中心位于辐射沙洲中部外海时,南部外海流场不再向弶港辐聚,而向南流;当台风中心到达废黄河口以北时,辐聚点南移至遥望港附近。在辐聚-辐散的流场作用下,最大增水和高潮位最大涨幅均出现在两大潮波汇聚的弶港附近,分别为2.72 m和0.95 m。

By establishing a coupled astronomic tide and storm surge model for Yellow Sea,analysis is made on the changes of tidal current fields and the spatial distribution features of water level fluctuations in radial sand ridegs off Jiangsu coast caused by typhoon ＂Muifa＂.It is learnt from the results that when the center of ＂Muifa＂ moved to the middle of the radial sand ridegs,the current fields in the south of the radial sand ridegs no longer gattered to Jianggang,but flowed southward instead;when the center of ＂Muifa＂moved to the north of the old Yellow River,the aggregate point moved south to Yaowanggang.During the ＂Muifa＂,with the effects of ridial tidal current fields,the maximum water level set-up and high tide level increase reached 2.73 m and 0.95 m respectively,both occuring near Jianggang,which is the aggregate point of two tidal waves.