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南海北部陆架坡折附近表层沉积物的粒度特征和其输运趋势
张洪运1, 庄丽华1, 阎军2,3, 马小川2,3
1.中国科学院海洋研究所;2.中国科学院海洋大科学研究中心;3.中国科学院海洋研究所 山东 青岛
摘要:
对南海北部陆架坡折附近取的50个表层沉积物样品,做粒度测试,计算粒度参数。粒度分析表明研究区的沉积物主要存在4种类型:含砾砂、砾质砂、砂质砾和含砾泥质砂;沉积物组分中砾石和砂占绝对优势,基本上不含黏土。综合因子分析和聚类分析的结果把研究区划分为4类沉积区:I类沉积区属于内陆架沉积区,II类沉积区属于陆架坡折上部沉积区,III类沉积区属于陆架坡折下部沉积区,IV类沉积区区属于陆架边缘沉积区,每类沉积区都代表着不同的沉积环境。研究区的粒径趋势分析结果显示,陆架坡折附近的沉积物主要向内陆架和外陆架边缘或上陆坡输运,同时存在着跨陆架输运和沿陆架坡折输运现象,这与研究区实测的底流方向相一致。
关键词:  南海北部  陆架坡折  沉积物粒度  沉积环境  物质输运
DOI:10.11759/hykx20181226003
分类号:P736.21
基金项目:国家自然科学基金面上项目(41576056)
Grain size characteristics of surface sediment and their transport patterns near the shelf break of northern South China Sea
zhang Hongyun,Zhuang Lihua,Yan Jun,Ma Xiaochuan
Institute of Oceanology, Chinese Academy of Sciences
Abstract:
Fifty surface sediment samples were collected near the shelf break of the continental shelf in the northern South China Sea. The grain-size analysis was performed to investigate the sedimentary environmental zoning and grain size transport trend. The contents of gravel, sand, silt and clay in the study area are 21.7%, 76.8%, 1.4% and 0.2% respectively. The sediments in the study area are mainly divided into four types, which are (gravel) sand, gravel sand, sandy gravel, and (gravel) muddy sand. The study area can be divided into four types of sedimentary areas basing on factor analysis and cluster analysis. Area I is located in the northwest of the study area, It is belong to the sedimentary area of inner shelf. Area II belongs to the upper part sedimentary areas of the shelf break, while area III belongs to the down part sedimentary areas of the shelf break. Aare IV is shelf margin sedimentary area. Finally, the net transport of sediments is analyzed according to Gao-Collins''s GSTA model. The results show that the sediments near the shelf break mainly migrate to the inner shelf and upper slope, some can migrate across shelf break, and some migrate along the shelf break, which is in agreement with the bottom current observing at the study area.
Key words:  North China sea  Shelf break  Sediment grain size  Sedimentary environment  sediment transport
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