Bedform evolution along a submarine canyon in the South China Sea: New insights from an autonomous underwater vehicle survey

doi:10.1111/sed.13152

CORC > 深海科学与工程研究所 > 中国科学院深海科学与工程研究所 > 深海科学研究部 > 深海地球物理与资源研究室

	Bedform evolution along a submarine canyon in the South China Sea: New insights from an autonomous underwater vehicle survey
	Sun, Yue 7,8,9; Wang, Dawei 6,8,9; Canals, Miquel 7; Alves, Tiago M.5; Wang, Weiwei 4; Zhu, Yousheng 3; Qin, Yongpeng 9; Zeng, Fanchang 2; Zheng, Yu 1,9
刊名	SEDIMENTOLOGY
	2023-11-16
页码	34
关键词	Bedform cyclic steps furrows slope-confined canyon South China Sea turbidity currents
ISSN号	0037-0746
DOI	10.1111/sed.13152
通讯作者	Wang, Dawei(wangdawei@idsse.ac.cn) ; Canals, Miquel(miquelcanals@ub.edu)
英文摘要	Traditional mapping of bedforms in submarine canyons relied on vessel-mounted and towed sensors, but their fine-scale geomorphology and shallow structure requires higher resolution datasets. This study utilizes a high-resolution dataset obtained from an autonomous underwater vehicle, combined with seismic reflection profiles and sediment cores, to analyse bedform sets within a 25.6 km long submarine canyon (canyon C14) in the northern South China Sea. A train of crescent-shaped axial steps, indicative of cyclic steps formed by supercritical turbidity currents, is imaged along the canyon. Axial steps in the upper course show erosional truncations and sub-horizontal reflectors on the lee and stoss sides, respectively, pointing to erosional-depositional cyclic steps formed by confined flows with high erosional capacity. This is facilitated by canyon narrowness and steeper axial gradient. After a transition segment, the lower course widens, with a gentler axial gradient, resulting in increased asymmetry and wavelength of axial steps. Backset bed deposits on the stoss sides of these steps indicate depositional cyclic steps with higher aggradation. Sediment filling, almost padding each cyclic step associated scour suggests the reworking of previously formed bedforms by gravity flows fed by destabilization processes on the canyon sidewalls and upstream lee faces and, possibly, by shelf-edge and uppermost slope spillover into the canyon. At the lowermost course, cyclic steps transition to a furrow field, likely associated with flow velocity reduction facilitated by canyon floor widening and a further decrease in slope gradient. Flow braiding and re-convergence, related to the erosion of fine-grained deposits within the canyon floor, should have played a role to produce furrows under supercritical conditions. This work enhances our understanding of the detailed morphology and shallow relief configuration of bedforms in deep-water submarine canyons, providing insights into their causative processes and evolution.
资助项目	National Key Research and Development Program of China[2022YFC2805503] ; National Natural Science Foundation of China[42176083] ; Key Research and Development Program of Hainan Province[ZDYF2020209] ; Chinese Academy of Sciences-Sanya Local Government Cooperation Project[2015YD10] ; Government of Catalonia[2021 SGR 01195]
WOS关键词	SEDIMENT DENSITY FLOWS ; INTERNAL SOLITARY WAVES ; ST-LAWRENCE ESTUARY ; RIVER MOUTH BASIN ; CYCLIC STEPS ; TURBIDITY CURRENTS ; CONTINENTAL-SLOPE ; SUPERCRITICAL FLOWS ; QIONGDONGNAN BASIN ; WATER CASCADES
WOS研究方向	Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:001102701000001
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Key Research and Development Program of Hainan Province ; Chinese Academy of Sciences-Sanya Local Government Cooperation Project ; Government of Catalonia
内容类型	期刊论文
源URL	[http://ir.idsse.ac.cn/handle/183446/10649]
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	Wang, Dawei; Canals, Miquel
作者单位	1.Tsinghua Univ, Shenzhen Int Grad Sch, Shenzhen Key Lab Marine IntelliSense & Computat, Shenzhen 510871, Peoples R China 2.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Zhuhai 519000, Peoples R China 3.China Oilfield Serv Ltd, Tianjin 300459, Peoples R China 4.China Univ Petr East China, Coll Control Sci & Engn, Qingdao 266580, Peoples R China 5.Cardiff Univ, Sch Earth & Environm Sci, Seism Lab 3D, Main Bldg Pk Pl, Cardiff CF10 3AT, Wales 6.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519000, Peoples R China 7.Univ Barcelona, Fac Earth Sci, Dept Earth & Ocean Dynam, CRG Marine Geosci, Barcelona 08028, Spain 8.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 9.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
推荐引用方式 GB/T 7714	Sun, Yue,Wang, Dawei,Canals, Miquel,et al. Bedform evolution along a submarine canyon in the South China Sea: New insights from an autonomous underwater vehicle survey[J]. SEDIMENTOLOGY,2023:34.
APA	Sun, Yue.,Wang, Dawei.,Canals, Miquel.,Alves, Tiago M..,Wang, Weiwei.,...&Zheng, Yu.(2023).Bedform evolution along a submarine canyon in the South China Sea: New insights from an autonomous underwater vehicle survey.SEDIMENTOLOGY,34.
MLA	Sun, Yue,et al."Bedform evolution along a submarine canyon in the South China Sea: New insights from an autonomous underwater vehicle survey".SEDIMENTOLOGY (2023):34.