长江口北港拦门沙河段上段演变分析  

Evolution of the upper reach of mouth bars in the North Channel of the Changjiang Estuary

作　　者：茅志昌[1] 武小勇[2] 赵常青[1] 郭建强[1] 

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

出　　处：《泥沙研究》2008年第2期41-46,共6页Journal of Sediment Research

基　　金：国家“973”基础研究计划(2002CB412403);国家自然科学基金项目(40576042)

摘　　要：根据水文泥沙观测和地形资料分析,三十多年来,在长江洪水造床作用、南北港分流口通道的兴衰更替以及北港分流分沙功能增强等因素作用下,北港拦门沙河段上段发生了较大变化,例六沙脊的形成及其沙尾下移;河道中央呈现纵长17km的水下沙脊,形成二槽一脊的W型复式河槽;团结沙外侧发育了北港北沙等地貌现象。Based on data extracted from topographic charts and obtained through hydrological and sediment surveys in the mouth bars reach of the North Channel of the Changjiang Estuary,this paper intends to analyze the evolution of the lower reach of the North Channel.Changes of the upper reach of mouth bars in the North Channel was big,for example,Liuxiao sandy ridge had been enlarged seawards,underwater sandy ridges with length of 17km occurred in the North Channel from the area near the north of Hengsha island to 122°02′E,and the North Sha in the North Channel had formed,it is situated southeast of the Tuanjiesha since 1980s.The basic reasons：（1）effects of floods on re-building of river bed;（2） the ratio of the water and sand diversion of the North Channel is greater than that of the South Channel;and（3） the eroding or developing of the diversion gap passage of the North and South Channel.

关 键 词：长江口 北港拦门沙河段上段 河槽演变 

分 类 号：TV148[水利工程—水力学及河流动力学]