Detailed seafloor geomorphology of the western region of the North Yellow Sea,China:The result of Holocene erosional and depositional processes sculpting the offshore continental shelf  

作　　者：Xiaoyu Liu Yilan Chen Chenguang Liu Qiuhua Tang Yanhong Wang Shan Gao 

机构地区：[1]First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266100,China [2]Key Laboratory of Oceanic Surveying and Mapping,Ministry of Natural Resources,Qingdao 266590,China

出　　处：《Acta Oceanologica Sinica》2022年第12期38-47,共10页海洋学报（英文版）

基　　金：The National Natural Science Foundation of China under contract Nos 41506069,41876111;the Open Fund of Key Laboratory of Marine Surveying and Mapping of the Ministry of Natural Resources under contract No.2021B01.

摘　　要：High-resolution multi-beam/single-beam bathymetric data and seismic profiling data from the latest surveys are used to map and interpret the detailed seafloor geomorphology of the western region of the North Yellow Sea(NYS),China.The mapping area covers 156410 km^(2),and incorporates a flat shelf plain,subaqueous accumulation shoals,tidal scouring troughs,and tidal sand ridge groups.Offshore areas with water depths less than 50 m in the western region of the NYS are mainly covered by thick,loose sediments,forming wide spread accumulation geomorphological features;these include the Liaodong Peninsula subaqueous accumulation system containing shoals and rugged scouring troughs,and the large mud wedge of the Shandong Peninsula.In the central part of the NYS,there is a relatively flat residual shelf plain with coarser sediment deposits.This flat shelf plain has a water depth larger than 50 m and a thin layer of sediment,on which there is a large pockmark field caused by seafloor seepage.These geomorphological structures indicate that modern sedimentary processes are the main driving force controlling the sculpture of the current seafloor surface landform.Extensive strong tidal current systems and abundant sediment sources provide the critical external forces and essential conditions for the formation of seafloor geomorphology.The tectonic basement controls the macroscopic morphological shape of the NYS,but is reflected very little in the seafloor geomorphic elements.Our results provide a detailed seafloor geomorphological map of the western region of the NYS,an area that has not previously mapped and also provide a scientific framework for further research into offshore seafloor geomorphology,shelf sedimentary processes,and submarine engineering construction in this region.

关 键 词：seafloor geomorphology North Yellow Sea geomorphic map mud wedge accumulative shoal 

分 类 号：P736[天文地球—海洋地质]