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

doi:10.1061/(ASCE)HY.1943-7900.0000951

IMECH-IR > 流固耦合系统力学重点实验室

	Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model
	Cao ZX; Li J; Pender G; Liu QQ(刘青泉); Cao, ZX (reprint author), Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.
发表期刊	Journal of Hydraulic Engineering
	2015-02
卷号	141 期号:2
ISSN	0733-9429
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.
关键词	Reservoir Turbidity Current Sedimentation Sediment Flushing Double Layer-averaged Model Reservoir Management
学科领域	Engineering ; Water Resources
DOI	10.1061/(ASCE)HY.1943-7900.0000951
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000348033300001
关键词[WOS]	DRIVEN GRAVITY CURRENTS ; SHALLOW-WATER MODEL ; SEDIMENT TRANSPORT ; DENSITY-CURRENT ; FLOW STRUCTURE ; UNDERFLOWS ; 2-LAYER ; HYDRODYNAMICS ; FORMULATION ; SIMULATION
WOS研究方向	Engineering ; Water Resources
WOS类目	Engineering, Civil ; Engineering, Mechanical ; Water Resources
项目资助者	The research is funded by Natural Science Foundation of China (Grant Nos. 10932012 and 10972164).
课题组名称	LMFS水环境流体力学(LEM)
论文分区	二类/Q2
引用统计	被引频次：37[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/49635
专题	流固耦合系统力学重点实验室
通讯作者	Cao, ZX (reprint author), Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.
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,&Cao, ZX .(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).

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
E0000951.pdf（8598KB）	期刊论文	出版稿	开放获取	CC BY-ND	浏览下载