江苏大丰海岸碱蓬滩潮沟及滩面的沉积动力特征

李占海; 高抒; 柯贤坤; 汪亚平

江苏大丰海岸碱蓬滩潮沟及滩面的沉积动力特征

1.
华东师范大学河口海岸国家重点实验室, 上海 200062
2.
南京大学海岸与海岛开发教育部重点实验室, 江苏南京 210093
3.
南京大学海岸与海岛开发教育部重点实验室, 江苏南京 210093;里贾纳大学地理学系, 里贾纳 S4S 0A2

基金项目: 国家自然科学基金资助项目(49976026);“973”资助项目(2002CB412403)

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出版历程
- 收稿日期: 2004-07-29
- 修回日期: 2005-04-16

Sediment dynamic processes of salt marsh creek and adjacent tidal-flats on the Dafeng coast, Jiangsu Province, China

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
2.
Key Laboratory of Coast & Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China
3.
Key Laboratory of Coast & Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China;Department of Geography, University of Regina, Regina S4S 0A2, Canada

摘要

摘要: 根据2002年7月在江苏大丰碱蓬滩潮沟观测的水文、悬沙、底质等资料,分析了潮沟的输水、输沙特征及悬沙和底质在粒径组成上的关系,结果表明,潮沟在流速、悬沙浓度、输水、悬沙输运、底质活动性等方面具有明显的涨落潮不对称.滩面归槽水占潮沟落潮输水量的33%,由此造成的悬沙输运量占潮沟落潮悬沙输运量的20%,这是导致潮沟涨落潮输水输沙不对称的主要因素.在一个潮周期中潮沟的净输水、净悬沙输运方向与滩面相反,指向落潮方向.悬沙和底质组成以粉砂和黏土为主,潮沟和滩面的悬沙粒径组成差别很小.悬沙是滩面底质的主要物质来源,两者在粒径组成上存在着必然联系,沉积物粒径与该粒级在底质中的含量与在悬沙中的含量之比具有明显的幂函数关系.
- 碱蓬滩 /
- 潮沟 /
- 涨落潮不对称 /
- 滩面归槽水
Abstract: On the basis of the measurements of current velocities and suspended sediment concentrations within a tidal creek,together with analysis of surficial sediment samples collected from the creek and the adjacent Sueada salsa flats on 27 and 29 July 2002,at Wang gang,Jiangsu coast,characteristics of water and suspended sediment transport rates within the creek and the relationship between suspended and seabed sediments were analyzed.The results show that there is remarkable flood-ebb time-asymmetry for the tidal current,with variations in the suspended sediment concent ration and the rate of water/sediment transport.The marsh surface supplied water quantity accounts for 33% of the ebb water quantity in the creek,resulting in 20% of the ebb suspended sediment discharge in the creek during the ebb.This is a basic influence on the time asymmetry.Consequently,within a tidal cycle,the net water and suspended sediment discharges in the creek are opposite to those for the marsh surface,i.e.,they dominated.Silt and clay are the dominant components of the suspended and seabed sediments,accounting for more than 95% uri.The difference in grain size distribution between the suspended sediment within the creek and the bed sedimenton the adjacent marsh surface is very small.Variations in the suspended sediment concentration during the tidal cycle show that a substantive amount of the suspended sediments settles onto the marsh surface;the suspended sediments are the major source of seabed sediments.Therefore,the grain size distributions of seabed and suspended sediments are very close and there is a good exponential relationship between the grain size and the ratio of the content of the component associated with the grain size in the seabed sediment to that in the suspended sediment.
- Sueada salsa flat /
- tidal creek /
- flood-ebb time-asy mmetry /
- marsh surface supplied creek water mass

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