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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Geohazards and Georisks
Volume 12 - 2024 | doi: 10.3389/feart.2024.1532456
This article is part of the Research Topic High-Altitude and Long-Runout Landslide Dynamics: Theory, Methods, and Applications View all articles

Research on the movement process of erosion-denudation type debris flow in middle-low mountains based on particle algorithm model

Provisionally accepted
Xiaofeng He Xiaofeng He 1*Yongfeng Gong Yongfeng Gong 1*Jinkai Yan Jinkai Yan 2*Shichang Gao Shichang Gao 1*Zheng He Zheng He 1*Gang Zhang Gang Zhang 1*Guorui Wang Guorui Wang 1*Zhiyong Hu Zhiyong Hu 1*Hui Wang Hui Wang 1*
  • 1 Ningxia Hui Autonomous Region Land and Resources Survey and Monitoring Institute, ningxia, China
  • 2 Chinese Academy of Geological Sciences, Beijing, China

The final, formatted version of the article will be published soon.

    Debris flow is one of the significant geological hazards in mountainous regions of China, characterised by its sudden onset, high mobility, and considerable damage. In the Helan Mountain, debris flows primarily comprise coarse-grained materials transported by water flows, exhibiting high destructive potential and a broad impact range. Therefore, the dynamic study of debris flow in this region is crucial. This study focuses on the Zhengguangou debris flow, utilising the DAN-3D software based on Smoothed Particle Hydrodynamics (SPH) to construct a dynamic debris flow model. The movement characteristics of the debris flow were investigated by simulating various operating conditions, including differences in formation area conditions and rainfall. The simulation results indicate that under extreme conditions (pore pressure coefficient of 0.8), the debris flow with the same initial volume travelled an average distance of 1503 m, farther than the 1323 m travelled under normal conditions (pore pressure coefficient of 0.3). Under normal conditions, the final average deposition thickness of the debris flow was 8.9 m, thicker than the 8.3 m observed under extreme conditions. Regarding movement speed, the debris flow initially accelerated and then decelerated, with the extreme condition showing greater distance travelled than the normal condition. Additionally, the debris flow had a greater erosion depth and volume under normal conditions. In contrast, the extreme conditions exhibited a larger scraping width, with the maximum width occurring at the point where the flow direction changed. This study contributes to understanding the dynamic characteristics of debris flows in northern Ningxia and provides valuable insights for hazard prediction and mitigation.

    Keywords: Debris flow, Dynamic characteristics, numerical simulation, DAN-3D software, Zhengguangou

    Received: 22 Nov 2024; Accepted: 27 Dec 2024.

    Copyright: © 2024 He, Gong, Yan, Gao, He, Zhang, Wang, Hu and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Xiaofeng He, Ningxia Hui Autonomous Region Land and Resources Survey and Monitoring Institute, ningxia, China
    Yongfeng Gong, Ningxia Hui Autonomous Region Land and Resources Survey and Monitoring Institute, ningxia, China
    Jinkai Yan, Chinese Academy of Geological Sciences, Beijing, China
    Shichang Gao, Ningxia Hui Autonomous Region Land and Resources Survey and Monitoring Institute, ningxia, China
    Zheng He, Ningxia Hui Autonomous Region Land and Resources Survey and Monitoring Institute, ningxia, China
    Gang Zhang, Ningxia Hui Autonomous Region Land and Resources Survey and Monitoring Institute, ningxia, China
    Guorui Wang, Ningxia Hui Autonomous Region Land and Resources Survey and Monitoring Institute, ningxia, China
    Zhiyong Hu, Ningxia Hui Autonomous Region Land and Resources Survey and Monitoring Institute, ningxia, China
    Hui Wang, Ningxia Hui Autonomous Region Land and Resources Survey and Monitoring Institute, ningxia, China

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