Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model

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	Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model
	Cao ZX; Li J; Pender G; Liu QQ(刘青泉)
刊名	Journal of Hydraulic Engineering
	2015-02
通讯作者邮箱	zxcao@whu.edu.cn
卷号	141 期号:2
关键词	Reservoir Turbidity current Sedimentation Sediment flushing Double layer-averaged model Reservoir management
ISSN号	0733-9429
通讯作者	Cao, ZX (reprint author), Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.
产权排序	[Cao, Zhixian; Li, Ji] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China; [Cao, Zhixian; Pender, Gareth] Heriot Watt Univ, Inst Infrastruct & Environm, Edinburgh EH14 4AS, Midlothian, Scotland; [Liu, Qingquan] Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
合作状况	国际
中文摘要	Turbidity current is formed as subaerial open-channel sediment-laden flow plunges into a reservoir. The whole process of reservoir turbidity current, i.e., formation, propagation, and recession, is generally controlled by the water and sediment inputs from upstream and also the reservoir operation scheme specifying the downstream boundary condition. Enhanced understanding of reservoir turbidity current is critical to effective sediment management in alluvial rivers. However, until now there has been a lack of physically based and practically feasible models for resolving the whole process of reservoir turbidity current. This is because the computing cost of three-dimensional modeling is excessively high. Also, single layer-averaged models cannot resolve the formation process characterized by the transition from open-channel sediment-laden flow to subaqueous turbidity current, or the upper clear-water flow as dictated by the operation scheme of the reservoir, which has significant impacts on turbidity current. Here a new two-dimensional double layer-averaged model is proposed to facilitate for the first time whole-process modeling of reservoir turbidity current. The two hyperbolic systems of the governing equations for the two layers are solved separately and synchronously. The model is well balanced because the interlayer interactions are negligible compared with inertia and gravitation, featuring a reasonable balance between the flux gradients and the bed or interface slope source terms and thus applicable to irregular topographies. The model is benchmarked against a spectrum of experimental cases, including turbidity currents attributable to lock-exchange and sustained inflow. It is revealed that an appropriate clear-water outflow is favorable for turbidity current propagation and conducive to improving sediment flushing efficiency. This is significant for optimizing reservoir operation schemes. As applied to turbidity current in the Xiaolangdi Reservoir in the Yellow River, China, the model successfully resolves the whole process from formation to recession. The present work facilitates a viable and promising framework for whole-process modeling of turbidity currents, in support of reservoir sediment management. (C) 2014 American Society of Civil Engineers.
学科主题	Engineering ; Water Resources
分类号	二类/Q2
类目[WOS]	Engineering, Civil ; Engineering, Mechanical ; Water Resources
研究领域[WOS]	Engineering ; Water Resources
关键词[WOS]	DRIVEN GRAVITY CURRENTS ; SHALLOW-WATER MODEL ; SEDIMENT TRANSPORT ; DENSITY-CURRENT ; FLOW STRUCTURE ; UNDERFLOWS ; 2-LAYER ; HYDRODYNAMICS ; FORMULATION ; SIMULATION
收录类别	SCI ; EI
资助信息	The research is funded by Natural Science Foundation of China (Grant Nos. 10932012 and 10972164).
原文出处	http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000951
语种	英语
WOS记录号	WOS:000348033300001
公开日期	2015-03-17
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/49636]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
推荐引用方式 GB/T 7714	Cao ZX,Li J,Pender G,et al. Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model[J]. Journal of Hydraulic Engineering,2015,141(2).
APA	Cao ZX,Li J,Pender G,&Liu QQ.(2015).Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model.Journal of Hydraulic Engineering,141(2).
MLA	Cao ZX,et al."Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model".Journal of Hydraulic Engineering 141.2(2015).