1210号台风大风和渤海湾天津沿岸风暴潮分析

Analysis of No.1210 typhoon gale and storm surge along Tianjin coast of the Bohai Bay

1210号台风"达维"尺度极小,地面气压场和高空位势高度场无闭合等值线存在;风场呈不对称分布,东侧东北大风明显;西侧西北和西南风明显偏弱;"达维"对渤海湾的增水作用,前期主要表现为双台风产生的黄海中部东南大风使水体向北输送的作用;后期当受"达维"影响,渤海产生东北大风并持续期间,虽然实况潮位曲线呈下降趋势,增水值仍持续增大;由于"达维"尺度较小,当它移出渤海湾向渤海东北方向移动时,渤海湾转为受西北风影响,东北风影响减弱,渤海湾天津附近增水值迅速回落。

The scale of the No.1210 typhoon＂Damrey＂is small,and the surface pressure field and upper geopotential height field are absence with closed contour.Wind field was asymmetric distributed,and the northeast winds on the eastern side was stronger than the northwest and southwest winds on the west side.Storm surge along the coast of the Bohai bay caused by ＂Damrey＂ was subdivided into two stages：the first stage was mainly about the northward transport of water driven by the southeast gale from the central part of Yellow sea,which was caused by dual typhoons; the second stage was mainly about the continuous increase of surge value and downward trend of the live tidal curve during the sustained northeast gale on Bohai,which was induced by ＂Damrey＂.Due to the small scale of ＂Damrey＂,the Bohai Bay turned to be af fected by the northwest wind when the typhoon moved northeastward from the Bohai Bay to the northeast part of Bohai; and the surge value of sea area near Tianjin decreased quickly afterwards.