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Modelling reservoir sediment flushing through a bottom tunnel with an initially covered intake

Yining Sun, Ji Li Orcid Logo, Zhixian Cao, Jinxin Liu Orcid Logo, Huan Xu Orcid Logo, Alistair G.L. Borthwick Orcid Logo

Applied Mathematical Modelling, Volume: 125, Pages: 425 - 443

Swansea University Author: Ji Li Orcid Logo

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DOI (Published version): 10.1016/j.apm.2023.10.018

Abstract

Sediment flushing through a bottom tunnel is one of the most effective methods to alleviate reservoir sedimentation. However, the multi-physical hydro-sediment-morphological processes of reservoir sediment flushing through an initially covered bottom tunnel intake have remained poorly understood, an...

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Published in: Applied Mathematical Modelling
ISSN: 0307-904X
Published: Elsevier BV 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa64708
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spelling v2 64708 2023-10-11 Modelling reservoir sediment flushing through a bottom tunnel with an initially covered intake 4123c4ddbcd6e77f580974c661461c7c 0000-0003-4328-3197 Ji Li Ji Li true false 2023-10-11 CIVL Sediment flushing through a bottom tunnel is one of the most effective methods to alleviate reservoir sedimentation. However, the multi-physical hydro-sediment-morphological processes of reservoir sediment flushing through an initially covered bottom tunnel intake have remained poorly understood, and a physically enhanced and practically viable mathematical model is required. The present study uses an integrated model to resolve sediment flushing through an initially covered bottom tunnel intake. The proposed model couples a two-dimensional double layer-averaged model for the reservoir with a one-dimensional model for the bottom tunnel by means of numerical fluxes calculations at the inner boundary. The governing equations are solved synchronously using a well-balanced finite volume method. Several parameters related to boundary resistances and sediment exchange fluxes need to be determined for model closure. The model is tested against data from a series of physical experiments on reservoir sediment flushing, with sound agreement achieved between computed and measured scour hole geometries. Moreover, the present model successfully predicts the occurrence of tunnel blockage. The results prove that reservoir sediment flushing is best accomplished for high reservoir water level, small cover layer thickness, short tunnel length and steep tunnel slope. The present model facilitates reservoir design and operation to help preserve reservoir capacity. Journal Article Applied Mathematical Modelling 125 425 443 Elsevier BV 0307-904X Reservoir sedimentation, Bottom tunnel, Sediment flushing, Tunnel blockage, Double layer-averaged model 31 1 2024 2024-01-31 10.1016/j.apm.2023.10.018 http://dx.doi.org/10.1016/j.apm.2023.10.018 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University This work was funded by the National Natural Science Foundation of China under Grant No. 12072244. 2023-12-04T15:49:15.3561316 2023-10-11T09:22:50.2017204 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 3 Jinxin Liu 0000-0002-8845-671x 4 Huan Xu 0000-0001-6358-5729 5 Alistair G.L. Borthwick 0000-0001-6053-7764 6 Under embargo Under embargo 2023-10-11T09:33:24.6653539 Output 1491681 application/pdf Proof true 2024-10-06T00:00:00.0000000 true eng
title Modelling reservoir sediment flushing through a bottom tunnel with an initially covered intake
spellingShingle Modelling reservoir sediment flushing through a bottom tunnel with an initially covered intake
Ji Li
title_short Modelling reservoir sediment flushing through a bottom tunnel with an initially covered intake
title_full Modelling reservoir sediment flushing through a bottom tunnel with an initially covered intake
title_fullStr Modelling reservoir sediment flushing through a bottom tunnel with an initially covered intake
title_full_unstemmed Modelling reservoir sediment flushing through a bottom tunnel with an initially covered intake
title_sort Modelling reservoir sediment flushing through a bottom tunnel with an initially covered intake
author_id_str_mv 4123c4ddbcd6e77f580974c661461c7c
author_id_fullname_str_mv 4123c4ddbcd6e77f580974c661461c7c_***_Ji Li
author Ji Li
author2 Yining Sun
Ji Li
Zhixian Cao
Jinxin Liu
Huan Xu
Alistair G.L. Borthwick
format Journal article
container_title Applied Mathematical Modelling
container_volume 125
container_start_page 425
publishDate 2024
institution Swansea University
issn 0307-904X
doi_str_mv 10.1016/j.apm.2023.10.018
publisher Elsevier BV
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
url http://dx.doi.org/10.1016/j.apm.2023.10.018
document_store_str 0
active_str 0
description Sediment flushing through a bottom tunnel is one of the most effective methods to alleviate reservoir sedimentation. However, the multi-physical hydro-sediment-morphological processes of reservoir sediment flushing through an initially covered bottom tunnel intake have remained poorly understood, and a physically enhanced and practically viable mathematical model is required. The present study uses an integrated model to resolve sediment flushing through an initially covered bottom tunnel intake. The proposed model couples a two-dimensional double layer-averaged model for the reservoir with a one-dimensional model for the bottom tunnel by means of numerical fluxes calculations at the inner boundary. The governing equations are solved synchronously using a well-balanced finite volume method. Several parameters related to boundary resistances and sediment exchange fluxes need to be determined for model closure. The model is tested against data from a series of physical experiments on reservoir sediment flushing, with sound agreement achieved between computed and measured scour hole geometries. Moreover, the present model successfully predicts the occurrence of tunnel blockage. The results prove that reservoir sediment flushing is best accomplished for high reservoir water level, small cover layer thickness, short tunnel length and steep tunnel slope. The present model facilitates reservoir design and operation to help preserve reservoir capacity.
published_date 2024-01-31T15:49:16Z
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score 11.013776

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