摘要
基于江苏如东近岸海域32个表层沉积物粒度参数分析,探讨了沉积物类型、粒级组分及粒度参数分布特征.在此基础上,结合Folk三角图示法、Q型系统聚类法和研究区潮流动力特征,将如东近岸海域划分为3个分区,即近岸潮滩-沙脊区、潮流通道区和辐射沙洲外缘区.研究结果表明,受物质来源和沉积动力变化的影响,江苏如东近海表层沉积物粒度分布具有明显的空间差异.如东海域表层沉积物类型主要有3种,以砂质粉砂为主,平均含量为50%;粉砂质砂次之,平均含量为46.87%;砂含量最少,为3.13%.平均粒径介于25.65~171.72μm之间,均值为70.61μm,其分布与砂含量具有一致的变化趋势.分选性、偏度和峰态分别具有较差-差、近对称-极负偏、尖锐-很尖锐的特征.空间分布上,(1)近岸潮滩-沙脊区,水深较浅,地形冲淤动态变化复杂,沉积物砂含量较多,粒径整体较粗;(2)潮流通道区,水道内部深度大,底部受水动力影响较小,黏土含量较多,粒径变细;(3)辐射沙洲外缘区,水深大,受潮流动力作用小,沉积环境相对稳定.
Based on the datas of grain size composition and parameter analysis of 32 surface sediments in the coastal areas of Rudong in Jiangsu Province,the distribution characteristics of sediment types,grain size components and grain size parameters were analyzed.In addition,combined with the Folk&Ward’s nomenclature,the Q-type system cluster analysis method and the tidal dynamic characteristics of the study area,the coastal areas of Rudong were divided into three sub-areas,namely the near-shore tidal flat and sand ridge area,the tidal channel area and the edge region of sand ridge,respectively.The results indicated that the distribution of grain size in surface sediments has obvious spatial differences in the coastal areas of Rudong by the influence of material source and sedimentary dynamics environmental.There are three sediment types in surface sediments in the coastal areas of Rudong,with sandy silt as the main content,the average content of 50%;followed by silty sand,the average content of 46.87%;the sand content have least proportion,the average content of 3.13%.The mean grain size of surface sediment are between 25.65-171.72μm,and the average of 70.61μm.In addition,the trend of spatial distribution is consistent with the change of sand content.Sorting coefficient,skewness,and kurtosis are characterized by poor-difference,near-symmetry-extremely negative,sharp-very sharp,respectively.Spatially,(1)The nearshore tidal flat-sand ridge area,there are abundance of sand content and coarser of grain size in sediments by water depth of shallow,sedimentary and erosion dynamic changes of complex;(2)The tidal channel area,there are more clay content and finer grain size in sediments by the channel’s depth of large,the bottom affected by hydrodynamics of less;(3)The edge region of sand ridge,there are deep water depth and little effected by tidal current of relatively stable sedimentary environment.
作者
黄润秋
赵一飞
刘晴
徐敏
Huang Runqiu;Zhao Yifei;Liu Qing;Xu Min(College of Marine Science and Engineering,Nanjing Normal University,Nanjing 210023,China)
出处
《南京师大学报（自然科学版）》
CAS
CSCD
北大核心
2020年第1期91-99,共9页
Journal of Nanjing Normal University(Natural Science Edition)
基金
国家自然科学基金项目(41373112、41801005)
江苏省海洋科技创新专项项目(HY2018-3).
关键词
江苏近岸
表层沉积物
粒度特征
沉积环境
沉积动力
coastal areas of Jiangsu
surface sediments
grain size characteristics
sedimentary environment
sedimentary dynamics
