Landslide-tsunami prediction in narrow reservoirs involving reflection

Jizhixian Liu (), Yang Wang (), Kunlong Yin (), Lixing Wu () and LongFei Zhang ()
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Jizhixian Liu: China University of Geosciences
Yang Wang: China University of Geosciences
Kunlong Yin: China University of Geosciences
Lixing Wu: China University of Geosciences
LongFei Zhang: China University of Geosciences

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2023, vol. 115, issue 3, No 28, 2457-2482

Abstract: Abstract Subaerial landslide-tsunamis (SLTs) are generated by mass movements impacting into water bodies such as lakes, reservoirs or oceans. A recent SLT was the 2003 Qianjiangping event in the Three Gorges Reservoir resulting in 11 missing fishermen. Preliminary hazard assessments of SLTs relay on investigations in wave flumes (2D) with longitudinal wave propagation and basins (3D) with radially propagating waves. This study focuses on lateral slide impact into narrow reservoirs for which available empirical equations for the maximum wave amplitude am or height Hm based on 2D or 3D studies alone are unlikely to result in accurate predictions. A 3D-2D method has recently been proposed to calculate the decay of am and Hm in such geometries, i.e. 3D approaches are used for the slide impact region followed by 2D approaches for the far field. This study aims to verify this 3D-2D method and to estimate wave decays in narrow reservoirs, involving reflections, based on 115 laboratory experiments. New empirical equations for the decay of am and Hm in the 3D region (with wave propagation distance r ≤ wr, with wr as the reservoir width) are proposed. It is then verified that this 3D-2D method is feasible for predicting wave attenuation in narrow reservoirs. The suitability of available equations are discussed and the present equations are successfully used to predict a past SLT with a deviation of 19.9%. The present study reveals that the new empirical equations are the most suitable to be applied in this 3D-2D method to support preliminary SLT hazard assessment.

Keywords: Laboratory experiments; Landslide-tsunami prediction; Narrow reservoir; Natural hazard; Wave reflection (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11069-022-05649-5

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