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Effect of tributary inflow on reservoir turbidity current

Yining Sun, Ji Li Orcid Logo, Zhixian Cao Orcid Logo, Alistair G. L. Borthwick, János Józsa

Environmental Fluid Mechanics, Volume: 23

Swansea University Author: Ji Li Orcid Logo

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DOI (Published version): 10.1007/s10652-022-09856-3

Abstract

Fluvial flows carrying high sediment loads may plunge into reservoirs to form turbidity currents. However, the effects of tributary inflows on reservoir turbidity currents have remained poorly understood to date. Here a 2D double layer-averaged model is used to investigate a series of laboratory-sca...

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Published in: Environmental Fluid Mechanics
ISSN: 1567-7419 1573-1510
Published: Springer Science and Business Media LLC 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa59842
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spelling v2 59842 2022-04-18 Effect of tributary inflow on reservoir turbidity current 4123c4ddbcd6e77f580974c661461c7c 0000-0003-4328-3197 Ji Li Ji Li true false 2022-04-18 CIVL Fluvial flows carrying high sediment loads may plunge into reservoirs to form turbidity currents. However, the effects of tributary inflows on reservoir turbidity currents have remained poorly understood to date. Here a 2D double layer-averaged model is used to investigate a series of laboratory-scale numerical cases. By probing into the hydro-sediment-morphodynamic processes, we find that tributary location and inflow conditions have distinct effects on the formation and propagation of reservoir turbidity currents, and lead to complicated flow dynamics and bed deformation at the confluence. Two flow exchange patterns are generated at the confluence: turbidity current intrusion from the main channel into the tributary; and highly concentrated, sediment-laden flow plunging from the tributary into the turbidity current in the main channel. Tributary sediment-laden inflow may cause the stable plunge point to migrate downstream and is conducive to propagation of the turbidity current, whilst the opposite holds in the case of clear-water inflow from the tributary. Tributary inflow leads to a lower sediment f lushing efficiency as compared to its counterpart without a tributary. Yet a high sediment concentration in the tributary may reinforce turbidity current in the reservoir, thereby increasing sediment flushing efficiency. Around the confluence, the planar distributions of velocity and bed shear stress of the turbidity current resemble their counterparts in confluence flows carrying low sediment loads or clear water. Yet, the bed exhibits aggradation near the confluence due to the turbidity current, in contrast to pure scour in a river confluence with a low sediment load. Appropriate account of tributary effects is required in studies of reservoir turbidity currents, and for devising strategies for long-term maintenance of reservoir capacity. Journal Article Environmental Fluid Mechanics 23 Springer Science and Business Media LLC 1567-7419 1573-1510 Reservoir; Turbidity current; Tributary; Sediment flushing efficiency; Double layer-averaged model 16 4 2022 2022-04-16 10.1007/s10652-022-09856-3 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University Not Required This work has been funded by the National Natural Science Foundation of China under Grant No. 12072244. 2023-06-12T16:00:03.1121861 2022-04-18T10:50:27.3273607 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Yining Sun 1 Ji Li 0000-0003-4328-3197 2 Zhixian Cao 0000-0001-5161-385x 3 Alistair G. L. Borthwick 4 János Józsa 5 59842__24015__235f65b7653f444698e05b41659e99b2.pdf Effect of tributory inflow on reservoir turbidity current- Accepted manuscript1.pdf 2022-05-06T15:32:05.0308383 Output 4347152 application/pdf Accepted Manuscript true 2023-04-16T00:00:00.0000000 true eng
title Effect of tributary inflow on reservoir turbidity current
spellingShingle Effect of tributary inflow on reservoir turbidity current
Ji Li
title_short Effect of tributary inflow on reservoir turbidity current
title_full Effect of tributary inflow on reservoir turbidity current
title_fullStr Effect of tributary inflow on reservoir turbidity current
title_full_unstemmed Effect of tributary inflow on reservoir turbidity current
title_sort Effect of tributary inflow on reservoir turbidity current
author_id_str_mv 4123c4ddbcd6e77f580974c661461c7c
author_id_fullname_str_mv 4123c4ddbcd6e77f580974c661461c7c_***_Ji Li
author Ji Li
author2 Yining Sun
Ji Li
Zhixian Cao
Alistair G. L. Borthwick
János Józsa
format Journal article
container_title Environmental Fluid Mechanics
container_volume 23
publishDate 2022
institution Swansea University
issn 1567-7419
1573-1510
doi_str_mv 10.1007/s10652-022-09856-3
publisher Springer Science and Business Media LLC
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 1
active_str 0
description Fluvial flows carrying high sediment loads may plunge into reservoirs to form turbidity currents. However, the effects of tributary inflows on reservoir turbidity currents have remained poorly understood to date. Here a 2D double layer-averaged model is used to investigate a series of laboratory-scale numerical cases. By probing into the hydro-sediment-morphodynamic processes, we find that tributary location and inflow conditions have distinct effects on the formation and propagation of reservoir turbidity currents, and lead to complicated flow dynamics and bed deformation at the confluence. Two flow exchange patterns are generated at the confluence: turbidity current intrusion from the main channel into the tributary; and highly concentrated, sediment-laden flow plunging from the tributary into the turbidity current in the main channel. Tributary sediment-laden inflow may cause the stable plunge point to migrate downstream and is conducive to propagation of the turbidity current, whilst the opposite holds in the case of clear-water inflow from the tributary. Tributary inflow leads to a lower sediment f lushing efficiency as compared to its counterpart without a tributary. Yet a high sediment concentration in the tributary may reinforce turbidity current in the reservoir, thereby increasing sediment flushing efficiency. Around the confluence, the planar distributions of velocity and bed shear stress of the turbidity current resemble their counterparts in confluence flows carrying low sediment loads or clear water. Yet, the bed exhibits aggradation near the confluence due to the turbidity current, in contrast to pure scour in a river confluence with a low sediment load. Appropriate account of tributary effects is required in studies of reservoir turbidity currents, and for devising strategies for long-term maintenance of reservoir capacity.
published_date 2022-04-16T16:00:01Z
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