杭州湾北岸金汇潮滩冲淤分析  

SILTATION OR EROSION OF THE JINHUI TIDAL FLAT IN THE NORTH OF HANGZHOU BAY

作　　者：茅志昌[1] 郭建强[1] 赵常青[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20062

出　　处：《海洋湖沼通报》2006年第4期9-16,共8页Transactions of Oceanology and Limnology

摘　　要：杭州湾北岸在南汇嘴和金山嘴人工控制节点作用下,形成微弯内凹的弧形海岸廓线,金汇岸段位于弧形岸线凹段。由于海岸凹段内水流相对较弱,尤其是涨落潮转流过程中低流速(<20cm/s)历时长,有利于泥沙下沉淤泥。11世纪中叶,杭州湾北岸自修筑了第一条海塘进入人工控制后,金汇潮滩处于淤涨中。近年来,受长江来沙量减少和南汇边滩促淤圈围工程的影响,进入杭州湾北岸水域的泥沙也有所减少,出现冲刷现象,金汇潮滩由淤涨型转换为冲刷型。Based on the data extracted from bathymetric maps and data obtained through hydrological and sediment surveys, this paper mainly deals with the evolution of siltation and erosion of the Jinhui tidal flat in the north of Hangzhou Bay. The results show that under the control of artificial node points between Nanhui spit and Jinshan spit, an arc-shaped coastline with a slight landward me,ruder was formed in the north of Hangzhou Bay. The Jin- hut tidal flat is located where the line is concave. Weak flood and ebb currents, and long durations （about 1.0hr） of currents with lower velocities （〈20cm/s） during flood and ebb tidal currents ahermate, which is favorable to the siltation of the tidal flat. Discharge of the suspended sediment is greater during flood tide than that during ebb tide, which provides sedi ment for the siltation of the tidal flat. Under the influence of monsoons, accretion prevails in winter, and erosion prevails in summer in the Jinhui tidal flat. In recent years, due to the decreasing of sediment from the Changjiang River drainage basin and the retaining effect on sedimentation of some reclamation activities, especially the Nanhui artificial semi island project, the amount of sediment transported into Hangzhou Bay decreased, resulting in strengthening erosion.

关 键 词：杭州湾北岸 金汇潮滩 冲淤演变 

分 类 号：P737.121[天文地球—海洋地质]