河口冲淤对围垦的响应  

Response of estuarine erosion and deposition to reclamation in estuary

作　　者：郭聪[1,2] 孙志林[1] 郑浩磊 潘桂娥 

机构地区：[1]浙江大学港口海岸与近海工程研究所,浙江杭州310058 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [3]浙江省水利发展规划研究中心,浙江杭州310012

出　　处：《浙江大学学报（工学版）》2016年第9期1791-1797,共7页Journal of Zhejiang University：Engineering Science

基　　金：教育部博士点基金资助项目(2120101110108);浙江省水利厅重点资助项目(RB1212)

摘　　要：为了研究椒江河口地形对毗邻海域连续多段大面积滩涂围垦(即集群围垦)的响应,利用二维潮流非均匀沙数学模型,预测椒江河口现状岸线下及规划围垦工程后的床面冲淤.结果显示:现状岸线下未来河口河道大部分区域发生冲刷,口外拦门沙有少量淤积;规划围垦工程后河口河道及口外拦门沙淤积,河口延伸段冲刷;与各围垦工程单独作用的叠加效果相比,集群围垦联合作用下的冲淤幅度更大,即存在非线性效应,应在围垦规划时予以重视;河口水动力随毗邻海域围垦面积的增大而减弱,水流挟沙能力随之下降,因而河口河道及口外拦门沙的淤积厚度随围垦面积的增大而增大.Large scale and multi-stage reclamation （i. e. cluster reclamation） of tidal flat was planned and performed near the Jiaojiang Estuary. A series of numerical simulations were carried out by using a 2D mathematical model for tidal flow and nonuniform sediment transport in order to investigate the response of seabed erosion and deposition to cluster reclamation in Jiaojiang Estuary. According to the results, ero-sion occurred in most part of estuarine channel while a small amount of deposition occurred in mouth-bar region in the situation of present coastline. When the planned reclamation is imposed, a serious deposition occurs in estuarine channel and mouth-bar region while the new extend part of estuary caused by reclama-tion is eroded. Compared with the combined effect of each single reclamation on erosion and deposition, the effect of the whole cluster reclamation is larger, that is to say, there is a nonlinear effect. Special at-tention for the nonlinear effect should be paid to the effect of cluster reclamation on seabed evolution. With the increase in the area of reclamation, the hydrodynamics of estuarine channel and mouth-bar region weakens and therefore sediment transport capacity decreases, then the thickness of deposition increases in these areas.

关 键 词：床面冲淤 响应 集群围垦 非均匀沙 非线性效应 椒江河口 

分 类 号：TV14[水利工程—水力学及河流动力学] P75[天文地球—海洋科学]