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Evolution of deepwater turbidite bedforms in the Huaguang channel-lobe transition zone revealed by 3D seismic data in the Qiongdongnan Basin, South China Sea

文献类型：期刊论文

作者Wang, Weiwei1; Wang, Dawei2,3,4; Sun, Jin2; Shao, Dali5; Lu, Yintao5; Chen, Yuxiang2; Wu, Shiguo2,3,4,6
刊名GEOMORPHOLOGY
出版日期2020-12-01
卷号370页码:15
关键词Channel-lobe transition zone Turbidite bedforms Depositional elements Drainage network
ISSN号0169-555X
DOI10.1016/j.geomorph.2020.107412
英文摘要The theoretical model of turbidite bedform evolution has been verified based on laboratory tests and outcrop sur-veys. However, the evolution of the bedforms associated with flow regime variation within the channel-lobe transition zone (CLTZ) is poorly documented and generally extremely poorly understood. In this study, a combination of seismic sedimentological and topographic analyses, based on high-resolution 3D seismic data within the Qiongdongnan Basin of the South China Sea, was used. Continuous bedforms varied with the depositional elements within the CLTZ of the Huaguang leveed channel system along the flow direction. The depositional elements within the CLTZ change from the main channel to the distributary channels as well as to the sub distributary channels. Numerous bifurcation and confluence points of gravity flows illustrated the complexity of the drainage network within the CLTZ. The average asymmetry index of the bedforms increased from 0.8 to 1.6, with the average wavelength increasing from 803 m to 1545 m along the thalweg of the channels. Crevasse splays at the starting reach of the CLTZ are likely to form the initial state of the new CLTZ in the future, because the slope gradient starting from the avulsion point was higher than that inside the channel. The deep scours at the bifurcation points and high steps at the confluence points demonstrate the critical roles of supercritical flows and hydraulic jumps in reworking the bedforms of the CLTZ. The high steps at confluence points were simultaneously formed along the margin and thalweg of the main channel. The acceleration mechanisms of flow velocity forming the high steps were the increase of the elevation difference along the internal slope of the main channel margin and promotion of discharge along the main channel thalweg. This paper presents newly completed deep water observations of the present seafloor bedforms based on the turbidity currents within the CLTZ. These observations update the evolution model of local supercritical flows and hydraulic jumps under the global decreasing trend of the Froude numbers within CLTZs. (C) 2020 Elsevier B.V. All rights reserved.
WOS关键词SEDIMENT WAVES ; DEPOSITIONAL ELEMENTS ; SUBMARINE CANYONS ; HYDRAULIC-JUMP ; CYCLIC STEPS ; FLOW ; TRANSPORT ; MONTEREY ; SYSTEM ; LEVEE
资助项目National Natural Science Foundation of China[41666002] ; Key Research Projects of the Frontier Science of the Chinese Academy of Sciences[QYZDB-SSW-SYS025] ; Hainan Provincial Natural Science Foundation of China[2018CXTD346]
WOS研究方向Physical Geography ; Geology
语种英语
WOS记录号WOS:000589917000002
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; Key Research Projects of the Frontier Science of the Chinese Academy of Sciences ; Hainan Provincial Natural Science Foundation of China
源URL[http://ir.idsse.ac.cn/handle/183446/8438]  
专题深海科学研究部_深海地球物理与资源研究室
深海工程技术部_深海资源开发研究室
深海工程技术部_深海探测技术研究室
通讯作者Wang, Dawei
作者单位1.China Univ Petr East China, Coll Control Sci & Engn, Qingdao 266580, Peoples R China
2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519000, Peoples R China
5.Petrochina Hangzhou Res Inst Geol, Hangzhou 310023, Peoples R China
6.Qingdao Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Weiwei,Wang, Dawei,Sun, Jin,et al. Evolution of deepwater turbidite bedforms in the Huaguang channel-lobe transition zone revealed by 3D seismic data in the Qiongdongnan Basin, South China Sea[J]. GEOMORPHOLOGY,2020,370:15.
APA Wang, Weiwei.,Wang, Dawei.,Sun, Jin.,Shao, Dali.,Lu, Yintao.,...&Wu, Shiguo.(2020).Evolution of deepwater turbidite bedforms in the Huaguang channel-lobe transition zone revealed by 3D seismic data in the Qiongdongnan Basin, South China Sea.GEOMORPHOLOGY,370,15.
MLA Wang, Weiwei,et al."Evolution of deepwater turbidite bedforms in the Huaguang channel-lobe transition zone revealed by 3D seismic data in the Qiongdongnan Basin, South China Sea".GEOMORPHOLOGY 370(2020):15.

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来源：深海科学与工程研究所

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