The Momentum Transfer Mechanism of a Landslide Intruding a Body of Water

Zhenzhu Meng, Jianyong Hu (), Jinxin Zhang, Lijuan Zhang and Zhenxia Yuan
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Zhenzhu Meng: School of Water Conservancy and Environment Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Jianyong Hu: School of Geomatics and Municipal Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Jinxin Zhang: School of Water Conservancy and Environment Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Lijuan Zhang: Huai’an Water Conservancy Survey and Design Institute Co., Ltd., Huai’an 223005, China
Zhenxia Yuan: School of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou 450007, China

Sustainability, 2023, vol. 15, issue 18, 1-18

Abstract: Landslide-generated waves occur as a result of the intrusion of landslides such as mud flows and debris flows into bodies of water such as lakes and reservoirs. The objective of this study was to determine how the momentum is transferred from the sliding mass to the body of water on the basis of theoretical analysis and physical model experiments. Considering the viscoplastic idealization of natural landslides, the theoretical model was established based on the momentum and mass conservation of a two-phase flow in a control volume. To close the theoretical equations, slide thickness and velocity passing through the left boundary of the control volume were estimated by lubrication theory, and the interaction forces between the slide phase and water phase, including hydrostatic force and drag force, were given by semiempirical equations fitted with experimental data obtained using the particle image velocimetry (PIV) technique. The near-field velocity fields of both the sliding mass and the body of water, as well as the air–water–slide interfaces, were determined from the experiments. The theoretical model was validated by comparing the theoretical and experimental data of the slide thickness and slide velocity, as well as the momentum variations of the two phases in the control volume.

Keywords: momentum transfer; landslide-generated waves; PIV; viscoplastic material; interaction force; Carbopol (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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