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Multi-phase flow simulation of landslide dam formation process based on extended coupled DEM-CFD method

journal contribution
posted on 27.09.2021, 08:59 by Tingkai Nian, Dongyang Liu, Qiuhua LiangQiuhua Liang, Hao Wu, Xingsen Guo
The landslide-river interaction and the impulse waves involved in the landslide dam formation process may not be insignificant and have not been extensively investigated and simulated. This paper presents a numerical investigation on the formation process of landslide dams and resulting free surface flow dynamics in the impacted river via coupled discrete element method (DEM) and computational fluid dynamics (CFD) with the volume of fluid (VOF). The accuracy and validity of the extended coupled method are verified using a series of test cases involving three-phase interaction and free surface evolution. It is then applied to simulate the landslide dam formation processes related to landslide and river flow scenarios of different kinematic characteristics. Furthermore, quantitative analysis is performed to describe the complex evolution of the dam morphology and dynamic evolution of impulse waves. It is found that the impact between the landslide, river flow and valley drives the dam formation process. The landslide velocity considerably influences the propagation of impulse waves, while the river flow velocities control the dam morphology in opposite ways in the upstream and downstream. This research provides a practical modeling framework to understand the formation mechanism of landslide dams and support applications in hazard prediction and mitigation.

Funding

National Natural Science Foundation of China (51879036, U1765107, 51579032)

LiaoNing Revitalization Talents Program (XLYC2002036)

History

School

  • Architecture, Building and Civil Engineering

Published in

Computers and Geotechnics

Volume

140

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Computers and Geotechnics and the definitive published version is available at https://doi.org/10.1016/j.compgeo.2021.104438

Acceptance date

31/08/2021

Publication date

2021-09-17

Copyright date

2021

ISSN

0266-352X

eISSN

1873-7633

Language

en

Depositor

Prof Qiuhua Liang. Deposit date: 26 September 2021