南黄海海底辐射沙洲及西洋水道地形变化研究  

Study on Topographic Change of Radiation Sandbank and Western Waterway in Seabed of South Yellow Sea

作　　者：周春煦[1] ZHOU Chun-xu(Nantong Shipping College, Nantong 226010, Chin)

机构地区：[1]南通航运职业技术学院,江苏南通226010

出　　处：《水电能源科学》2018年第5期61-65,共5页Water Resources and Power

基　　金：江苏省高校优秀科技创新团队项目(2017-49)

摘　　要：为探索江苏省东部南黄海海底的辐射沙洲的形成演变规律,建立了平面二维水动力潮流泥沙数学模型,基于实测水文泥沙资料验证模拟结果,分析了该区域水沙特征,并采用机制分解法分析了西洋水道近期的地形冲淤变化特征。结果表明,辐射沙脊群海域涨落潮总体上呈现以弶港为顶点的往复流形态,而辐射沙脊群外部海域流场则表现为较明显的旋转流流态。辐射沙洲海域含沙量变化趋势与流场变化趋势基本一致。而对于西洋水道,由于涨潮流速大于落潮流速,涨潮冲刷占据主导作用,泥沙净输沙方向为由北向南,使其近30年(1979~2009年)来,总体呈现"北冲南淤"的变化特征。同时西洋东槽规模不断扩大,小阴沙面积逐渐减小,西洋东、西槽之间的水体交换正逐渐通过瓢儿沙中部和东侧水道进行。研究成果对于进一步认识并利用辐射沙洲意义重大。In order to explore the evolution regularity of radiation sandbank in the seabed of South Yellow Sea,eastern of Jiangsu Province,this paper established a mathematical model of two-dimensional hydrodynamic tidal current sediment.The simulation results were verified based on the observed hydrological and sediment data.And then the characteristics of water and sediment in this area were analyzed.The recent variation characteristics of terrain scouring and silting in the Western Ocean Waterway were analyzed by mechanism decomposition method.The results show that the fluctuating tide of the coastal waters of the radiation sand ridge population appears the reciprocating flow form with the peak of Hong Kong as the vertex,and the flow field of the outer sea area of the radiate sand ridge group is an obvious eddy flow regime.The trend of sediment concentration in the sandstorm is consistent with that of the flow field.For the Western channel,due to the rate of flood tide is higher than that of the ebb tide,flood tide erosion is dominant,the direction of the net sediment transport is from north to south so that the variation characteristics show the overall ＂ northern erosion southern deposition＂ in the nearly 30 years.At the same time,the size of the eastern trough broadens continuously,and the area of the small sand is gradually reduced.The water exchange between the eastern and western troughs is gradually progressing the middle and the east side of water channel.The research has important significance of utilizing radiation sandbank.

关 键 词：辐射沙洲 数学模型 西洋水道 机制分解 

分 类 号：TV142[水利工程—水力学及河流动力学]