Dynamic process of a typical slope debris flow: a case study of the wujia gully, Zengda, Sichuan Province, China

Yao Shunyu, Nazir Ahmed Bazai (), Tang Jinbo, Jiang Hu, Yi Shujian, Zou Qiang, Tashfain Ahmed and Guo Jian
Additional contact information
Yao Shunyu: Chinese Academy of Sciences
Nazir Ahmed Bazai: China-Pakistan Joint Research Center on Earth Sciences, CAS-HEC
Tang Jinbo: Chinese Academy of Sciences
Jiang Hu: Chinese Academy of Sciences
Yi Shujian: CAS
Zou Qiang: CAS
Tashfain Ahmed: Balochistan University of Information Technology Engineering and Management Sciences BUITEMS
Guo Jian: Chang’an University

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2022, vol. 112, issue 1, No 24, 565-586

Abstract: Abstract On July 25, 2020, a debris flow occurred in the Wujia Gully, Sichuan Province, China. The last debris flow in this gully occurred 70 years ago and severely impacted the area downstream. The primary goal of this study was to analyze the impact of the topography on the movement process of the debris flow. To gain a precise understanding, a dataset was compiled, including metrological data, field data, accounts from locals, field sampling to obtain specific information using Unmanned Aerial Vehicle (UAV) photography, and the rheological properties of the debris flow slurry obtained through soil mechanics and rheological experiments. The movement process of the debris flow was simulated using the depth-integrated continuum approach. Based on numerical simulation analysis, the influence of the Wujia gully’s topography on the debris flow’s dynamic process was examined. It was found that the debris flow in the Wujia Gully was a typical viscous debris flow, and the debris flow slurry had the properties of a Bingham fluid. The dynamic process of the debris flow was divided into four stages: an acceleration stage, a deceleration stage in the channel, a smooth movement stage, and a slow accumulation stage. The topography was the main factor controlling the formation of the four stages of the dynamic process. Furthermore, Manning's resistance coefficient did not change the debris flow’s dynamic process, but it significantly affected the velocity and duration of each stage. The results of this study provide a reference for future research on debris flow kinematics and flow channels of typical slope debris flows and their movement processes.

Keywords: Slope failure; Topography; Shallow water equation; Debris flow movement (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://link.springer.com/10.1007/s11069-021-05194-7 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:nathaz:v:112:y:2022:i:1:d:10.1007_s11069-021-05194-7

Ordering information: This journal article can be ordered from
http://www.springer.com/economics/journal/11069

DOI: 10.1007/s11069-021-05194-7

Access Statistics for this article

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards is currently edited by Thomas Glade, Tad S. Murty and Vladimír Schenk

More articles in Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards from Springer, International Society for the Prevention and Mitigation of Natural Hazards
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().