Flow and depositional response of turbidity currents to complex canyon topographies: A numerical simulation perspective
文献类型：期刊论文
| 作者 | Lu, Yang1; Liu, Xiaolei1,2; Yang, Yuping3; Wang, Dawei4 ; Yu, Heyu1; Zhang, Shaopeng1; Xie, Xiaotian1; Guo, Xingsen1,5
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| 刊名 | GEOMORPHOLOGY
 |
| 出版日期 | 2024-12-01 |
| 卷号 | 466页码:16 |
| 关键词 | Turbidity currents Slope-confined canyons CFD simulations Flow structures Linear deposition |
| ISSN号 | 0169-555X |
| DOI | 10.1016/j.geomorph.2024.109437 |
| 英文摘要 | Submarine canyons are prominent features on continental margins, acting as major conduits for sediment transport primarily through turbidity currents. Understanding how these currents interact with complex canyon topographies is crucial for deciphering the canyon system evolution, yet challenging due to limited field observations. Focusing on a group of slope-confined canyons within the Pearl River Mouth Basin, northern South China Sea, this study integrates multibeam bathymetry, core analysis, and process-based Computational Fluid Dynamics (CFD) modeling to investigate the influence of realistic canyon topography on turbidity current dynamics and resulting sediment deposition. Analysis of core samples revealed a potential turbidite layer characterized by silts and sandy silts. Using these sediment information and bathymetric data, we conducted a series of three-dimensional CFD simulations. Our findings highlight the significant variability in turbidity current characteristics, particularly flow velocity and sediment concentration, within the canyon groups. This variability is primarily controlled by canyon head depth, the width-to-relief ratio, and slope gradients. Notably, the simulations revealed unique flow structures not typically observed in experimental settings, including unidirectional flows, small-scale helical flows, stacked and mixed flow cells, and flow separation and convergence across intercanyon ridges. Our CFD simulations also revealed a distinct near-wall pattern of linear deposition of coarsegrained sediments, which is similar to the observed bathymetric changes between 2009 and 2017. Based on the consistent results, we propose a conceptual model wherein differential erosion, driven by oceanographic processes, plays a key role in shaping the observed linear depositional patterns. |
| WOS关键词 | RIVER MOUTH BASIN ; SOUTH CHINA SEA ; SINUOUS SUBMARINE CHANNELS ; SEDIMENT DEPOSITION ; CONTINENTAL-SLOPE ; HELICAL FLOW ; ARCHITECTURE ; QUATERNARY ; MIOCENE ; SYSTEM |
| 资助项目 | National Natural Science Foundation of China[42277138] ; National Key Research and Development Program of China[2022YFC2805503] ; Fundamental Research Funds for the Central Universities[202441003] ; Shandong Province National-Level Leading Talent Supporting Project[2022GJJLJRC-15] ; Shenzhen Science and Technology Major Project[KJZD20231025152759002] |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001333278700001 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities ; Shandong Province National-Level Leading Talent Supporting Project ; Shenzhen Science and Technology Major Project |
| 源URL | [http://ir.idsse.ac.cn/handle/183446/11710]  |
| 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 | Liu, Xiaolei; Wang, Dawei |
| 作者单位 | 1.Ocean Univ China, Shandong Prov Key Lab Marine Environm & Geol Engn, Qingdao 266100, Peoples R China 2.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China 3.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China 4.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China 5.UCL, Dept Civil Environm & Geomat Engn, London WC1E 6BT, England |
| 推荐引用方式 GB/T 7714 | Lu, Yang,Liu, Xiaolei,Yang, Yuping,et al. Flow and depositional response of turbidity currents to complex canyon topographies: A numerical simulation perspective[J]. GEOMORPHOLOGY,2024,466:16. |
| APA | Lu, Yang.,Liu, Xiaolei.,Yang, Yuping.,Wang, Dawei.,Yu, Heyu.,...&Guo, Xingsen.(2024).Flow and depositional response of turbidity currents to complex canyon topographies: A numerical simulation perspective.GEOMORPHOLOGY,466,16. |
| MLA | Lu, Yang,et al."Flow and depositional response of turbidity currents to complex canyon topographies: A numerical simulation perspective".GEOMORPHOLOGY 466(2024):16. |
入库方式： OAI收割
来源：深海科学与工程研究所
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