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Large-scale scours formed by supercritical turbidity currents along the full length of a submarine canyon, northeast South China Sea
Li, Shuang1,2,3; Li, Wei1,2,3; Alves, Tiago M.4; Wang, Jiliang5; Feng, Yingci1,2,3; Sun, Jie1,2,3; Li, Jian1,2,3; Wu, Shiguo5
2020-06-01
Source PublicationMARINE GEOLOGY
ISSN0025-3227
Volume424Pages:15
AbstractHigh-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.
KeywordSouth China Sea Scours Cyclic steps Submarine canyon Geomorphology Coriolis force
DOI10.1016/j.margeo.2020.106158
Indexed BySCI ; SCI
Funding OrganizationKey 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
Language英语
Funding ProjectKey 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 KeywordCYCLIC STEPS ; DEEP-WATER ; CONTINENTAL-MARGIN ; SEDIMENT WAVES ; CHANNEL ; SLOPE ; TRANSITION ; EVOLUTION ; INSIGHTS ; FEATURES
WOS Research AreaGeology ; Oceanography
WOS SubjectGeosciences, Multidisciplinary ; Oceanography
WOS IDWOS:000535718600010
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/7676
Collection深海科学研究部_深海地球物理与资源研究室
Corresponding AuthorLi, Wei; Wang, Jiliang; Feng, Yingci
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou 510301, Peoples R China
4.Cardiff Univ, Sch Earth & Ocean Sci, 3D Seism Lab, Main Bldg,Pk Pl, Cardiff CF10 3AT, Wales
5.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
Corresponding Author AffilicationInstitute of Deep-sea Science and Engineering,CAS
Recommended Citation
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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