海南四更沙海域沉积物分布及其受控机制

发布时间：2018-05-17 01:04

  本文选题：沉积物组分 + 粒度参数　； 参考：《沉积学报》2016年03期

【摘要】：基于海南西部四更沙及其邻近海域185个底质的粒度数据,并结合研究区动力状况和水深地形特征,研究表层沉积物的组分和类型分布、粒度参数及其沉积环境分区。结果表明:1研究区沉积物类型多样,包括12种沉积类型,以砂质粉砂、粉砂、粉砂质砂和含砾砂为主,沉积物平均粒径变化范围较大(-0.70~7.13?),且大体呈现由北向南逐渐变细的分布趋势;2运用Fleming的三角图式,结合物源状况及地形地貌条件,对沉积环境进行划分,将研究区划分为四更沙岸外海滨沉积区、北黎湾中部沉积区和八所港近岸沉积区等3个沉积区;3研究区沉积物分布特征受沉积物来源和水动力及地形条件共同影响。横向分布上,西部主要受强潮流输沙影响,东部近岸则主要受波浪掀沙和搬运作用影响,表现为两侧粗,中间相对较细的特征。纵向上,四更沙岸外海滨沉积区,沉积物主要受昌化江影响,粒径粗,表现为河口沉积特征;北黎湾中部沉积区,沉积物粒径分布范围广,表现为较强的过渡区特性;八所港近岸沉积区,沉积物粒径最细,泥沙来源主要为外海带来的泥沙。
[Abstract]:Based on the granularity data of 185 sediments in the west of Hainan and its adjacent sea areas, the composition and type distribution, granularity parameters and sedimentary environment zoning of the surface sediments are studied in combination with the dynamic status of the study area and the characteristics of the bathymetric topography. The results show that there are many types of sediments in the study area, including 12 sedimentary types, mainly sandy silt, silty sand and gravel sand. The average grain size of sediments varies from 0.70 to 7.13, and shows a trend of gradually thinning from north to south. The sedimentary environment is divided by using the triangular diagram of Fleming, combining with the source status and topographic and geomorphological conditions. The study zonation is divided into four seashore sedimentary areas, three sedimentary areas, I. e., the central sedimentary area of North Li Bay and the nearshore sedimentary area of Bazhonggang. The sediment distribution characteristics of the study area are affected by the sediment source, hydrodynamic and topographic conditions. In the transverse distribution, the west is mainly affected by strong tidal current and sediment transport, while the east coast is mainly affected by wave sand lifting and transport, showing the characteristics of coarse sides and relatively fine middle. Longitudinally, the sediment is mainly influenced by Changhua River, and its grain size is coarse, showing the characteristics of estuarine sedimentation, while in the middle of North Li Bay, the sediment size distribution range is wide, and the sediment is characterized by strong transition zone. The sediment size is the smallest in the near shore sedimentary area of Bazhonggang, and the sediment source is mainly the sediment brought by the sea.
【作者单位】： 华东师范大学河口海岸学国家重点实验室;
【基金】：海洋公益性行业科研专项经费项目(201405037) 河口海岸学国家重点实验室自主课题(SKLEC-2012KYYW06)~~
【分类号】：P736.21
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本文编号：1899202