【作者】 徐贝贝； 龚政； 张茜； 张长宽；

【Author】 XU Beibei;GONG Zheng;ZHANG Qian;ZHANG Changkuan;Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security,Hohai University;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University;

【机构】 河海大学江苏省海岸海洋资源开发与环境安全重点实验室； 河海大学水文水资源与水利工程科学国家重点实验室；

【摘要】 本文为探究潮滩泥沙粒径分布规律,于2015年12月24—26日大潮期间在江苏大丰潮滩进行了多点水沙同步观测,测量水深、波高、流速等水动力条件,采集了潮间带上、中、下部表层底质土样和涨落潮时水样。分析了悬沙与底沙的粒径组成,结果显示:(1)大丰潮滩悬移质以粉砂为主导,粉砂含量达78%,各测点观测期间悬沙粒径组成差异较小;(2)潮沟内漫滩水流使潮沟内粗颗粒悬沙沉积在相邻滩面上,形成滩面底质局部粗化区域;(3)研究区域潮网密度大,其输水输沙作用使得光滩上底质分带性不明显;(4)涨潮初期和落潮后期流速激增现象,使得大量滩面粗颗粒泥沙再悬浮。更多还原

【Abstract】 Field observations were conducted to explore the grain size distributions of both bed load and suspended sediment on Dafeng tidal flat of Jiangsu coast.Water depth,near-bed velocity and wave parameters were measured,and both suspended sediment and bed load were sampled.The grain size distributions of both suspended and bed load show that:①Suspended sediment is silt-dominant,of which the silt content is up to78%,and spatial variations of suspended sediment grain size can be ignored.②The coarser grains of suspended sediment in tidal creeks could deposit on the adjacent tidal flat due to velocity surge in tidal creeks,resulting in coarser bed load on the adjacent tidal flat locally.③Cross-shore zoning is not obvious due to the fully developed tidal network.④Consolidated surface sediment and the settled suspended sediment reworked at the early stage of flood due to velocity surge on tidal flats.更多还原