Grain-Size Distribution of Surface Sediments in the Bohai Sea and the Northern Yellow Sea: Sediment Supply and Hydrodynamics  

作　　者：YUAN Ping WANG Houjie WU Xiao BI Naishuang 

机构地区：[1]College of Marine Geosciences/Key Laboratory of Submarine Geosciences and Prospecting Techniques,MOE,Ocean University of China,Qingdao 266100,China [2]Laboratory of Marine Geology,Qingdao National Laboratory of Marine Science and Technology,Qingdao 266237,China

出　　处：《Journal of Ocean University of China》2020年第3期589-600,共12页中国海洋大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.41525021);the Ministry of Science and Technology of People's Republic of China (Nos.2016YFA0600903 and 2017YFC0405502)。

摘　　要：The grain-size distribution of surface sediments in the Bohai Sea(BS) and the northern Yellow Sea(NYS), and its relationship with sediment supply and hydrodynamic environment were investigated based on grain-size compositions of surface sediments and modern sedimentation rates. The results showed that the surface sediments in the BS and the NYS were primarily composed of silty sand and clayey silt with a dominant size of silt. In addition, the Yellow River delivered high amount of water and sediments to the BS, and they are dominated in surface sediments(mainly silt) in the Bohai Bay, the Yellow River mouth, the center of the BS, and the north coast of Shandong Peninsula. The coarse-grained sediments were mainly deposited at the river mouth due to the estuarine filtration and physical sorting. Meanwhile, there was a significant relationship among the modern sedimentation rate, the surface sediment grain size distribution and sediment transport pattern. The areas with coarser surface sediments generally corresponded low sedimentation rates because of strong erosion;whereas the sedimentation rate was relatively high at the place that the surface sediments were fine-grained. Furthermore, the grain-size trend analysis showed that the areas with fine-grained surface sediments such as the mud area in the central BS and the upper Liaodong Bay were the convergent centers of surface sediments, except for the Bohai Bay and the subaqueous Yellow River Delta where offshore sediment transport was evident.

关 键 词：Bohai Sea and North Yellow Sea surface sediment grain size sedimentation rate sediment supply sedimentary dynamic environment 

分 类 号：P736.21[天文地球—海洋地质]