Spatial distribution of bedforms and related flow processes around canyon mouths: Insights from the Rovuma Basin (offshore Mozambique)

doi:10.1111/bre.12887

IOCAS-IR > 海洋地质与环境重点实验室

	Spatial distribution of bedforms and related flow processes around canyon mouths: Insights from the Rovuma Basin (offshore Mozambique)
	Chen, Yuhang 1,2,3,4; Lu, Yintao5 ; Wang, Xiaofeng 6; Fan, Guozhang 5; Li, Lin 5; Xu, Xiaoyong 5; Zuo, Guoping 5; Shao, Dali 5; Cao, Quanbin 5
	2024-07-01
发表期刊	BASIN RESEARCH
ISSN	0950-091X
卷号	36 期号:4 页码:25
通讯作者	Chen, Yuhang(cyh@xsyu.edu.cn)
摘要	Bedforms associated with turbidite systems are commonly observed on seafloor. Previous studies have analysed bedform morphological and sedimentary features to determine their formation mechanisms and flow dynamics. However, the seafloor topography and ocean circulation have comprehensively influenced both down- and along-slope turbidity flow processes, complicating the spatial distribution of the related bedforms. Three-dimensional seismic data (3D) were used to depict the morphological and sedimentary features of the bedforms around the canyon mouth on the slope of the Rovuma Basin (offshore Mozambique), to reveal the spatial distribution and related flow processes of the bedforms. The results show that the spatial morphological and sedimentary features of the submarine bedforms at canyon mouths are controlled by the combined action of down- and along-slope factors. The along-slope bottom currents influence the deposition distribution of the turbidity current at the canyon mouth. However, slope breaks control bedform morphological and sedimentary features during downslope turbidity currents. Coarse-grained material of turbidity current flows along the axial zone of the canyon mouth, forming a linear series of crescent-shaped net-erosional cyclic steps characterized by short steep stoss sides and long gentle lee sides. The fine-grained material of the turbidity currents is deflected towards the northern flank of the axial zone by the bottom currents and deposited as undulating net-depositional cyclic steps at upper reach of the northern flank, showing long gentle stoss sides and short steep sides. Slope breaks enhance the erosion on cyclic steps by altering the velocity of turbidity current, forming net-erosional cyclic steps with the manifestation of both short and steep stoss and lee sides at lower reaches of northern flank. The turbidity current in the axial zone formed lateral flow diversions caused by the obstruction of the cyclic steps. The flow diversions converge with the downslope flowing unconfined turbidity current at the northern flank and constitute a confluence characterized by continuous variation of flow properties, forming the cyclic steps featuring irregular morphology. Spatial morphological and sedimentary features of the submarine bedforms at canyon mouths are controlled by the combined action of down- and along-slope factors. Along-slope bottom currents influence the deposition distribution of the turbidity current at canyon mouth. However, slope breaks control the morphology of the bedforms along downslope.image
关键词	bedforms cyclic steps flow process Rovuma Basin spatial distribution turbidity current
DOI	10.1111/bre.12887
收录类别	SCI
语种	英语
资助项目	Open Fund of Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences ; Open Fund of Key Laboratory of Submarine Geosciences, Ministry of Natural Resources[KLSG 2208] ; Natural Science Basic Research Program of Shaanxi[2024JC-YBMS-227] ; National Natural Science Foundation of China[41802128] ; National Natural Science Foundation of China[42076219]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001270690600001
出版者	WILEY
WOS关键词	DEEP-WATER CHANNELS ; SEDIMENT WAVES ; CYCLIC STEPS ; TURBIDITY-CURRENT ; CONTOUR CURRENTS ; HYDRAULIC JUMPS ; BOTTOM CURRENTS ; THRUST BELT ; SEA-FLOOR ; TRANSITION
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/186246
专题	海洋地质与环境重点实验室
通讯作者	Chen, Yuhang
作者单位	1.Xian Shiyou Univ, Sch Earth Sci & Engn, Xian 710065, Shaanxi, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 3.Minist Nat Resources, Key Lab Submarine Geosci, Hangzhou, Peoples R China 4.Xian Shiyou Univ, Shaanxi Key Lab Petr Accumulat Geol, Xian, Shaanxi, Peoples R China 5.PetroChina Hangzhou Inst Geol, Hangzhou, Peoples R China 6.CNODC Mozamb Lda, Beijing, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Chen, Yuhang,Lu, Yintao,Wang, Xiaofeng,et al. Spatial distribution of bedforms and related flow processes around canyon mouths: Insights from the Rovuma Basin (offshore Mozambique)[J]. BASIN RESEARCH,2024,36(4):25.
APA	Chen, Yuhang.,Lu, Yintao.,Wang, Xiaofeng.,Fan, Guozhang.,Li, Lin.,...&Cao, Quanbin.(2024).Spatial distribution of bedforms and related flow processes around canyon mouths: Insights from the Rovuma Basin (offshore Mozambique).BASIN RESEARCH,36(4),25.
MLA	Chen, Yuhang,et al."Spatial distribution of bedforms and related flow processes around canyon mouths: Insights from the Rovuma Basin (offshore Mozambique)".BASIN RESEARCH 36.4(2024):25.