Engineering and Technological Sciences
Abstract
The southwestern mountainous region features steep terrain, deeply incised valleys, and complex geological structures. Debris flows, as a primary type of geological hazard in this area, severely constrain regional economic development due to their typical characteristics of high-frequency occurrence, ultra-strong dynamic damage, and complex dynamic movement processes. Based on the OpenLISEM numerical simulation platform, this study integrates rainfall, topography, and material source parameters from Chutou Gully and Sucun Gully in Wenchuan County. By conducting numerical simulations of the entire process of debris flow initiation, movement, and deposition, the 8.20 debris flow event in Chutou Gully and the 7.10 debris flow event in Sucun Gully were reconstructed. Key parameters such as flow velocity, flow depth, and deposition range were obtained. The model settings and related parameters were dynamically adjusted based on actual data, achieving simulation accuracy indices Ω of 1.57 and 1.37, respectively, indicating that the simulation results are generally consistent with actual observational data. Furthermore, the dynamic damage processes of debris flows in Chutou Gully and Sucun Gully under the service of check dams were predicted for rainfall frequencies of 5%, 2%, and 1%, providing reasonable suggestions for future disaster prevention and mitigation efforts. This study reveals the dynamic evolution patterns and entire movement processes of debris flows in the southwestern mountainous region under the constraints of check dams. The research content and related methods can provide data support and theoretical references for predicting similar debris flows in the region.
Full Text
Study on the Damage Process of Typical Debris Flows under the Service of Check Dams in Southwest Mountainous Areas
Luo Chaopeng 1 Kang Yongchuang 1 Luo Chaopeng1 Kang Yongchuang1
(1. PowerChina Guiyang Engineering Corporation Limited, Guiyang 550081, China)
(1. Guiyang Survey Design and Research Institute of Chinese Electric Power Construction Group Co., LTD, Guiyang 550081)
Abstract
The southwestern mountainous region features steep terrain, deeply incised valleys, and complex geological structures. Debris flows, as a primary type of geological hazard in this area, severely constrain regional economic development due to their typical characteristics of high-frequency occurrence, super-strong dynamic damage, and complex dynamic movement processes.
Based on the OpenLISEM numerical simulation platform, this study integrates rainfall, topography, and material source parameters from Chutou Gully and Sucun Gully in Wenchuan County. By conducting numerical simulations of the entire process of debris flow initiation, movement, and deposition, the 8.20 debris flow event in Chutou Gully and the 7.10 debris flow event in Sucun Gully are back-analyzed to obtain key parameters such as flow velocity, flow depth, and deposition range.
The model settings and related parameters are dynamically adjusted in combination with actual data, achieving simulation accuracy indices Ω values of 1.57 and 1.37, respectively, indicating that the simulation results are generally consistent with actual observation data.
Furthermore, the dynamic damage processes of debris flows in Chutou Gully and Sucun Gully under the service of check dams are predicted for rainfall frequencies of 5%, 2%, and 1%, providing reasonable suggestions for subsequent disaster prevention and mitigation efforts.
This study reveals the dynamic evolution patterns and entire movement process of debris flows in the southwestern mountainous region under the constraints of check dams. The research content and related methods can provide data support and theoretical references for predictive studies of similar debris flows in the region.
Keywords: debris flow; check dam; OpenLISEM; numerical simulation; dynamic damage
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This version posted 2025-09-02.