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

Zhixian Cao, Ji Li Orcid Logo, Gareth Pender, Qingquan Liu

Journal of Hydraulic Engineering, Volume: 141, Issue: 2

Swansea University Author: Ji Li Orcid Logo

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DOI (Published version): 10.1061/(ASCE)HY.1943-7900.0000951

Abstract

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 s...

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Published in: Journal of Hydraulic Engineering
ISSN: 0733-9429 1943-7900
Published: 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa51803
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spelling 2020-10-26T13:44:02.1894378 v2 51803 2019-09-12 Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model 4123c4ddbcd6e77f580974c661461c7c 0000-0003-4328-3197 Ji Li Ji Li true false 2019-09-12 CIVL 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 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 Journal Article Journal of Hydraulic Engineering 141 2 0733-9429 1943-7900 Reservoir; Turbidity current; Sedimentation; Sediment flushing; Double layer-averaged model; Reservoir management. 20 3 2015 2015-03-20 10.1061/(ASCE)HY.1943-7900.0000951 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2020-10-26T13:44:02.1894378 2019-09-12T05:47:54.7904650 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Zhixian Cao 1 Ji Li 0000-0003-4328-3197 2 Gareth Pender 3 Qingquan Liu 4
title Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model
spellingShingle Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model
Ji Li
title_short Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model
title_full Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model
title_fullStr Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model
title_full_unstemmed Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model
title_sort Whole-Process Modeling of Reservoir Turbidity Currents by a Double Layer-Averaged Model
author_id_str_mv 4123c4ddbcd6e77f580974c661461c7c
author_id_fullname_str_mv 4123c4ddbcd6e77f580974c661461c7c_***_Ji Li
author Ji Li
author2 Zhixian Cao
Ji Li
Gareth Pender
Qingquan Liu
format Journal article
container_title Journal of Hydraulic Engineering
container_volume 141
container_issue 2
publishDate 2015
institution Swansea University
issn 0733-9429
1943-7900
doi_str_mv 10.1061/(ASCE)HY.1943-7900.0000951
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering
document_store_str 0
active_str 0
description 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 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
published_date 2015-03-20T04:03:49Z
_version_ 1763753306754121728
score 11.013641

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