波浪对台风风暴潮过程的影响分析

利用胡克林等建立的长江口及邻近海域的二维风暴潮数值计算模式,对2007-2008年有较大影响的4次台风风暴潮进行加波浪和不加波浪的后报计算.将计算结果与实测资料进行比较分析,得出结论:波浪对于风暴潮的影响程度取决于台风的路径、登陆地点和不同时刻.在台风登录前后一两天内,加波浪计算比不加波浪计算出的风暴潮水位精度总体要高;当台风传播到近岸时,波浪破碎对近岸增水影响较大,需要加波浪计算台风风暴潮;对南登陆北上转出型台风风暴潮计算时需加波浪,而对南登陆型可不必加波浪,以提高计算效率.

Analysis of storm surge's process under the influence of waves

Four typhoon storm surges which affected Changjiang Estuary and its adjacent seas seriously during 2007—2008 were computed by using a 2D storm surge prediction model set up by Hu et al, and the effects of waves on storm surges were discussed. It was found by comparison that the impact of waves on storm surges depends on typhoon’s tracks, locations, and different times. The precision of predication of storm surges can be improved if the influence of waves on storm surges is considered in the days around typhoons’ landing. When a typhoon was close to the shore, the waves broken and affected the storm surge, so it is more reasonable to take account of the influence of waves. It’s necessary to compute waves for the south landing and northwards typhoons.