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Large-scale scours formed by supercritical turbidity currents along the full length of a submarine canyon, northeast South China Sea

文献类型：期刊论文

作者Li, Shuang3,4,5; Li, Wei3,4,5; Alves, Tiago M.2; Wang, Jiliang1; Feng, Yingci3,4,5; Sun, Jie3,4,5; Li, Jian3,4,5; Wu, Shiguo1
刊名MARINE GEOLOGY
出版日期2020-06-01
卷号424页码:15
关键词South China Sea Scours Cyclic steps Submarine canyon Geomorphology Coriolis force
ISSN号0025-3227
DOI10.1016/j.margeo.2020.106158
英文摘要High-resolution multibeam bathymetric and seismic data enables a detailed morphological investigation of a submarine canyon (West Penghu Canyon) on the northeastern South China Sea margin, where twenty-three (23) scours are observed along the canyon thalweg. These scours form narrow topographic depressions in plan view and show asymmetrical morphologies in cross-section. The identified scours can be further divided into two groups (Types A and B) based on their sizes and relative locations. They are separated by a slope break at a water depth of similar to 2850 m. Type A scours (S1-S18) occur upslope from the slope break, whereas Type B scours (S19-S23) lie downslope from this same break. The scours are interpreted as net-erosional cyclic steps associated with turbidity currents flowing through the West Penghu Canyon; the currents that form Type A scours reflect higher V, Q, and Delta(el) compared to the currents forming Type B scours. A change in slope gradient and loss of lateral confinement are proposed to control the change from Type A to Type B scours. Furthermore, Coriolis force influences the flow direction of turbidity currents, leading to the preferential development and larger incision depths of scours towards the southwestern flank of the West Penghu Canyon. Our results contribute to a better understanding on the origin of scours in submarine canyons across the world.
WOS关键词CYCLIC STEPS ; DEEP-WATER ; CONTINENTAL-MARGIN ; SEDIMENT WAVES ; CHANNEL ; SLOPE ; TRANSITION ; EVOLUTION ; INSIGHTS ; FEATURES
资助项目Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0104] ; National Natural Science Foundation of China[41876054] ; National Key Research and Development Program of China[2017YFC1500401] ; Key Laboratory of Ocean and Marginal Sea Geology, Chinese Academy of Sciences[OMG18-09] ; CAS Pioneer Hundred Talents Program
WOS研究方向Geology ; Oceanography
语种英语
WOS记录号WOS:000535718600010
出版者ELSEVIER
资助机构Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; Key Laboratory of Ocean and Marginal Sea Geology, Chinese Academy of Sciences ; CAS Pioneer Hundred Talents Program
源URL[http://ir.idsse.ac.cn/handle/183446/7675]  
专题深海科学研究部_深海地球物理与资源研究室
通讯作者Li, Wei; Wang, Jiliang; Feng, Yingci
作者单位1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
2.Cardiff Univ, Sch Earth & Ocean Sci, 3D Seism Lab, Main Bldg,Pk Pl, Cardiff CF10 3AT, Wales
3.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou 510301, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China
推荐引用方式
GB/T 7714		 Li, Shuang,Li, Wei,Alves, Tiago M.,et al. Large-scale scours formed by supercritical turbidity currents along the full length of a submarine canyon, northeast South China Sea[J]. MARINE GEOLOGY,2020,424:15.
APA Li, Shuang.,Li, Wei.,Alves, Tiago M..,Wang, Jiliang.,Feng, Yingci.,...&Wu, Shiguo.(2020).Large-scale scours formed by supercritical turbidity currents along the full length of a submarine canyon, northeast South China Sea.MARINE GEOLOGY,424,15.
MLA Li, Shuang,et al."Large-scale scours formed by supercritical turbidity currents along the full length of a submarine canyon, northeast South China Sea".MARINE GEOLOGY 424(2020):15.

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来源：深海科学与工程研究所

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