摘要
南汇东滩位于长江口与杭州湾的交汇带,受长江径流、来沙、波浪、潮汐和人类活动的影响,滩地地貌演变复杂。近百年来,南汇东滩北冲南淤,呈整体向东南伸展的演变趋势。波浪和潮流的共同作用,控制着南汇东滩滩坡和滩地走向,形成了岸、滩、槽平面发散的地貌形态。近年来,受长江口深水航道治理工程的影响,南汇东滩上段冲刷,下段淤积,地貌形态总体变化不大。没冒沙是南汇东滩上的次生沙体,形成于上个世纪的20年代,形成以来虽经历复杂的演变过程,但多年来沙嘴(或沙脊)的位置和走向基本保持稳定。南汇东滩平缓且稳定的滩坡、丰富的泥沙供应和适当的潮流、波浪动力是没冒沙长期稳定的内在机理。
Nanhui eastern mudflat,which has complicated dynamic conditions,sediment transport,sedimentological processes and morphological evolution,is located in the transitional zone between the Yangtze Estuary and the Hangzhou Bay.The comparison of bathymetric charts show that the flat has unitarily extended towards southeast in the past 100 years.The shoreline and flat are dominated by the waves and tide currents and exhibit radial scatter geomorphology and flat slope.As a sub-sand bar,Meimao sand ridge formed in the 1920s had experienced complex geomorphological evolution,but its location and direction of sand ridge remain stable.The stabilization of Meimao sand ridge is sourced from the flat slope of Nanhui eastern mudflat,abundant sediment supplement and proper dynamics of waves and tidal currents.
出处
《泥沙研究》
CSCD
北大核心
2007年第6期47-52,共6页
Journal of Sediment Research
基金
河海大学水文水资源与水利工程科学国家重点实验室开放研究基金资助项目(2005409111)
关键词
长江口
南汇东滩
没冒沙
水库
the Yangtze Estuary
Nanhui eastern mudflat
Meimao sand ridge
Reservoir
