台风“利奇马”对长江口水通量影响的数值模拟研究  

Numerical simulation of the impact of Typhoon"Lekima"on water flux in the Changjiang Estuary

作　　者：姚鼎 李铖 张凤林 葛建忠[3] 张洪生 郭文云 YAO Ding;LI Cheng;ZHANG Fenglin;GE Jianzhong;ZHANG Hongsheng;GUO Wenyun(Shanghai Maritime University,Shanghai 201300,China;Shanghai Marine monitoring and forecasting center,Shanghai 200062,China;State key laboratory of estuarine and coastal research,East China Normal University,Shanghai 200062,China)

机构地区：[1]上海海事大学海洋科学与工程学院,上海201300 [2]上海市海洋监测预报中心,上海200062 [3]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《海洋预报》2024年第4期66-76,共11页Marine Forecasts

基　　金：国家自然科学基金青年项目(41906143);国家自然科学基金(51679132);上海市青年科技英才扬帆计划项(19YF1418500);上海市科委地方高校基地能力建设项目(17040501600、21ZR1427000);上海市‘全渗透’深远海离岸能源动力前沿科学研究基地。

摘　　要：在台风等极端天气影响下,河口水通量可能会在短时间内发生强烈变化。利用无结构有限体积海岸海洋模型FVCOM,研究了1909号台风“利奇马”对长江口水通量及分流比的影响。结果表明:台风“利奇马”可造成南槽持续30 h的净向陆水通量;受台风影响,北支、北港、北槽和南槽4个入海口台风的入海净水通量都呈现相似的减小—增大—减小—恢复的变化规律,总净入海通量也呈现类似规律,且变化幅度可超过60%;台风总体上增大了北侧支汊的净分流比,减小了南侧支汊的净分流比。Under the influence of extreme weather,such as typhoons,the estuarine water flux may change strongly in a short time.In this study,the effects of Typhoon 1909"Lekima"on the water flux and split ratio in the Changjiang Estuary are investigated using the FVCOM model.The results show that Typhoon"Lekima"can cause the net landward water flux of the South Passage for more than 30 hours.Au the net water fluxes in the four inlets,i.e.North Branch,North Channel,North Passage and South Passage,show similar decrease-increasedecrease-recovery evolutions under the influence of the typhoon.The total net seaward water flux shows a similar evolution with its magnitude varying by more than 60%.The typhoon generally leads to the increase of net split ratio in the northern branch and the decrease of net split ratio in the southern branch.

关 键 词：FVCOM 台风影响 水通量 分流比 长江口 

分 类 号：P444[天文地球—大气科学及气象学]