登陆台风对长江口口门水域的影响

针对登陆台风对长江口口门水域产生的影响问题,采用统计学方法对3次登陆台风期间现场采集的长序列定点观测资料进行系统分析。结果表明,台风登陆后有效波周期减小至常态天气水平,未出现长周期涌浪;台风登陆前水位抬升,最大增水与最大有效波高均出现在登陆前高潮时;台风登陆前有效波高在2 m以上时,波浪对口门处由南向北的横向流速分量起到抑制作用;其他时段,口门处由南向北的横向流速分量变化与涨潮过程一致。

Impact of landing typhoon on estuarine entrance of the Yangtze River

For the impact of landing typhoon on the estuarine entrance of the Yangtze River,we analyze a sequence of fixed-point observed data systematically based on statistical method,which is collected during the three landing typhoons.The results show that after typhoon landing,the significant wave period decreases to normal,and no long-period surge occurs.The water level raises before the typhoon landing,and the maximum surge and greatest significant wave height both occur at the high tide moment before landing.When the significant wave height is above 2 m before the typhoon landing,the waves act as a disincentive to the lateral flow component at the entrance.Other time,the changing process of lateral flow component matches with spring tide well.