杭州湾淤泥质海岸岸线变化及其动态模拟  

Shoreline Change and Its Dynamic Simulation in the Muddy Coast Area of the Hangzhou Bay

作　　者：施伟勇[1] 戴志军[2] 谢华亮[2] 张小玲[2] 

机构地区：[1]国家海洋局第二海洋研究所,浙江杭州310012 [2]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《海洋科学进展》2012年第1期36-44,共9页Advances in Marine Science

基　　金：国家海洋局第二海洋研究所基本科研业务费专项--高强度开发下杭州湾北岸近岸动力响应及岸滩稳定性分析研究(JG0917);国家自然科学基金--高浊度河口及其临界海域的陆海相互作用(41021064);杭州湾北岸侵蚀淤泥被迁移及其沉积动力过程(41076050);上海市科技攻关项目--长江口海平面上升对城市安全影响及应对关键技术研究(10dz1210600)

摘　　要：通过对杭州湾北岸南竹港-龙泉岸段实测岸滩断面资料的统计分析,进而对淤泥质海岸岸线变化、影响因素及其动态模拟预报进行探讨。结果表明:因长江来沙减少以及侵蚀/淤积波自东向西移动,导致近10a来该岸段岸滩处于侵蚀状态,其中岸线整体后退;因季节性的波侯作用,岸滩具有冬淤夏冲的特征,岸线则表现为冬涨夏退,因局部工程作用影响的岸线则具有冬退夏涨的特征。此外,基于-3m和-8m等深线构建的径向基函数神经网络模型预报岸线的变化是可行的。The measured data from a muddy coast segment located from the Nanzhu Harbor to Longquan in the northern coast area of the Hangzhou bay were analyzed statistically.The shoreline change and its influencing factors as well as associated dynamic simulation in the muddy coast segment were discussed.The results show that the beach of the muddy coast segment has been being in an erosion state in recent 10 years due to the decreasing in the incoming sediments from the Yangtze River and the moving of erosion/accretion waves from east to west.This will cause the whole shoreline in the area studied to retreat.Moreover,due to the action of seasonal wave climate,the beach of the muddy coast segment is in a silting state in winter half year and an eroding state in summer half year.As a result,the shoreline is pushed seaward in winter half year and retreated landward in summer half year.However,some parts of the shoreline may be retreated landward in winter half year and advanced seaward in summer half year because of the impacts of local engineering actions.As to the prediction of shoreline changes,it is possible to use the BF neural network mode with input vectors of-3 m and-8 m isobaths.

关 键 词：岸线变化 淤泥质海岸 动态模拟 杭州湾北岸 

分 类 号：P737[天文地球—海洋地质]