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Waves and Sediment Transport Due to Granular Landslides Impacting Reservoirs / Ji Li, Zhixian Cao, Qingquan Liu

Water Resources Research, Volume: 55, Issue: 1, Pages: 495 - 518

Swansea University Author: Ji Li

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DOI (Published version): 10.1029/2018WR023191

Abstract

Granular landslides impacting reservoirs may generate large waves and cause active sediment transport, and an enhanced understanding of these processes is important for public safety and effective reservoir management. This study investigates the waves and sediment transport caused by landslides imp...

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Published in: Water Resources Research
ISSN: 0043-1397 1944-7973
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51727
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spelling 2020-10-26T13:46:07.5955665 v2 51727 2019-09-09 Waves and Sediment Transport Due to Granular Landslides Impacting Reservoirs 4123c4ddbcd6e77f580974c661461c7c 0000-0003-4328-3197 Ji Li Ji Li true false 2019-09-09 CIVL Granular landslides impacting reservoirs may generate large waves and cause active sediment transport, and an enhanced understanding of these processes is important for public safety and effective reservoir management. This study investigates the waves and sediment transport caused by landslides impacting reservoirs using a two‐dimensional coupled double‐layer‐averaged shallow water hydro‐sediment‐morphodynamic model. In contrast to existing models, which cannot fully account for sediment transport, the model makes a physical step forward. The model is benchmarked against laboratory experiments of landslide‐generated waves in both two and three dimensions. Based on extended numerical cases, the capability of the model is further demonstrated by comparisons with empirical relationships of waves in 2D. In addition, sediment transport is resolved in terms of the sediment concentration and bed deformation. The results show that the wave types and amplitudes in 2D are dictated by the sediment transport speed, which also governs the landslide‐to‐wave momentum transfer and the landslide efficiency, which is defined as the ratio of the horizontal runout distance to the vertical fall height. With increasing sediment transport speed, landslide‐generated waves in 2D vary gradually from smaller nonlinear oscillatory waves to larger waves with solitary‐like wave characteristics, including nonlinear transition waves, solitary waves, and dissipative transient bores. In contrast to the momentum transfer ratio, the landslide efficiency increases with the sediment transport speed and decreases with the reservoir water depth and the lateral spreading in 3D cases. Journal Article Water Resources Research 55 1 495 518 0043-1397 1944-7973 landslide; reservoir; sediment transport; waves; landslide efficiency; momentum transfer 21 2 2019 2019-02-21 10.1029/2018WR023191 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2020-10-26T13:46:07.5955665 2019-09-09T04:56:21.9236960 Ji Li 0000-0003-4328-3197 1 Zhixian Cao 2 Qingquan Liu 3
title Waves and Sediment Transport Due to Granular Landslides Impacting Reservoirs
spellingShingle Waves and Sediment Transport Due to Granular Landslides Impacting Reservoirs
Ji, Li
title_short Waves and Sediment Transport Due to Granular Landslides Impacting Reservoirs
title_full Waves and Sediment Transport Due to Granular Landslides Impacting Reservoirs
title_fullStr Waves and Sediment Transport Due to Granular Landslides Impacting Reservoirs
title_full_unstemmed Waves and Sediment Transport Due to Granular Landslides Impacting Reservoirs
title_sort Waves and Sediment Transport Due to Granular Landslides Impacting Reservoirs
author_id_str_mv 4123c4ddbcd6e77f580974c661461c7c
author_id_fullname_str_mv 4123c4ddbcd6e77f580974c661461c7c_***_Ji, Li
author Ji, Li
author2 Ji Li
Zhixian Cao
Qingquan Liu
format Journal article
container_title Water Resources Research
container_volume 55
container_issue 1
container_start_page 495
publishDate 2019
institution Swansea University
issn 0043-1397
1944-7973
doi_str_mv 10.1029/2018WR023191
document_store_str 0
active_str 0
description Granular landslides impacting reservoirs may generate large waves and cause active sediment transport, and an enhanced understanding of these processes is important for public safety and effective reservoir management. This study investigates the waves and sediment transport caused by landslides impacting reservoirs using a two‐dimensional coupled double‐layer‐averaged shallow water hydro‐sediment‐morphodynamic model. In contrast to existing models, which cannot fully account for sediment transport, the model makes a physical step forward. The model is benchmarked against laboratory experiments of landslide‐generated waves in both two and three dimensions. Based on extended numerical cases, the capability of the model is further demonstrated by comparisons with empirical relationships of waves in 2D. In addition, sediment transport is resolved in terms of the sediment concentration and bed deformation. The results show that the wave types and amplitudes in 2D are dictated by the sediment transport speed, which also governs the landslide‐to‐wave momentum transfer and the landslide efficiency, which is defined as the ratio of the horizontal runout distance to the vertical fall height. With increasing sediment transport speed, landslide‐generated waves in 2D vary gradually from smaller nonlinear oscillatory waves to larger waves with solitary‐like wave characteristics, including nonlinear transition waves, solitary waves, and dissipative transient bores. In contrast to the momentum transfer ratio, the landslide efficiency increases with the sediment transport speed and decreases with the reservoir water depth and the lateral spreading in 3D cases.
published_date 2019-02-21T04:13:39Z
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score 10.827821