Hydraulic and sedimentary responses of turbidity current to structurally-controlled topography
GE Zhiyuan1,2, XU Hongxiang1,2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China
Abstract As one of the main sedimentary processes on Earth,turbidity current is responsible for transporting significant amounts of terrigenous sediments,such as mud,sand and organic carbon,into deep water environments. Traditional depositional models of turbidite systems mainly focus on deep-water areas with planar topography. However,slope areas and various tectonic basins hosting turbidite sedimentation often have complex topographic characteristics. Recent studies of turbidite systems based on outcrop observations,numerical and physical simulations as well as in-situ monitoring,have revealed the hydraulic responses of turbidity current to complex topography,namely flow reflection,deflection and hydraulic jump. However,due to the difficulties of acquiring hydraulic parameters of turbidity current,and the topographic complexities of various structures,a gap still remains between our understanding of the hydraulic response of turbidity current to local topographies and large-scale sediment distribution patterns in structurally-controlled basins. Thus,the studies of turbidity current responses to various topographic settings are still largely model driven,with both similarities and variations present among different models. Taking folding topography as an example,at topographic highs,the gravitational potential energy of turbidity current tends to increase,and the turbidity current reflects and accumulates sediments in the upstream direction;while at a topographic low,gravitational potential energy of turbidity current tends to decrease and the turbidity current experiences hydraulic jumps and drop sediments in the downstream direction. In other cases,due to topographic variations,the sedimentary characteristics of turbidites vary in different tectonic settings. In summary,although significant progress has been made on understanding turbidity current responses to structurally-controlled topography,most studies are still qualitative and semi-quantitative in nature with static or oversimplified topography. Future studies,especially case anatomy combined with quantitative methods,such as in-situ monitoring and simulation,are imperative to enhance our understanding of the topic.
Fund:National Natural Science Foundation of China(No.42102119)
About author: GE Zhiyuan,born in 1986,is a professor and doctoral supervisor at the College of Geosciences,China University of Petroleum(Beijing). He is mainly engaged in researches and teaching of deep-water sedimentology and salt tectonic. E-mail: gezhiyuan@cup.edu.cn.
Cite this article:
GE Zhiyuan,XU Hongxiang. Hydraulic and sedimentary responses of turbidity current to structurally-controlled topography[J]. JOPC, 2023, 25(5): 1090-1117.
GE Zhiyuan,XU Hongxiang. Hydraulic and sedimentary responses of turbidity current to structurally-controlled topography[J]. JOPC, 2023, 25(5): 1090-1117.
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