Scholarlink

<p>Flash floods and debris flows pose significant threats to human safety and socioeconomic development. It is necessary to analyze the evolutionary process of flash floods and debris flows. Numerical modeling is a commonly used tool to study the evolution of disaster processes. However, existing hydrological or hydrodynamic numerical models for flash floods and debris flows often fail to effectively capture the rapid changes and complex fluid dynamics within fluvial systems, which results in low simulation accuracy. This paper innovatively constructs the HiPIMS-FLO-2D hybrid model for highly accurate simulating the compound disasters of flash floods and debris flows, and conducts a hazard assessment by integrating debris flow occurrence frequencies with multi-scenario simulations. Results show that: 1) The mean fit statistic F for flash-flood simulation was 0.8 (F ranges from 0 to 1, with larger values indicating better agreement), and the mean overall accuracy index Ω for debris-flow simulation was 1.673 (Ω ranges from -2 to 2, with values closer to 2 indicating higher accuracy). 2) High hazard areas for debris flows are primarily located in the middle of gullies and at the middle fronts of accumulation fans. Medium hazard areas are concentrated in the upper gullies and at the edges of the fans. Low hazard areas are distributed along the sides of the gullies and the wings of the fans. 3) Hipims-Flow-2D simulation accuracy is highly correlated with the DEM, and local DEM errors can affect the overall simulation accuracy. Corrections to the DEM result in a 19.05% and 13.17% improvement in the simulation accuracy for flash floods and debris flows. 4) An analysis of the different gully height hazards reveals that the differences in debris flow hazard are due to the effects of rainfall intensity and terrain slope. The HiPIMS-FLO-2D hybrid model proposed in this paper enhances the accuracy of simulations for flash floods and debris flows, providing a scientific basis for disaster prevention and management efforts.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Higher Accurate Flash Floods and Debris Flows Simulation: A Hybrid Model Coupling HiPIMS and FLO-2D

  • 期刊论文

  • 发表日期：

    2026年5月15日

查看全文
  • Haibo Yang,
  • Yitong Dong,
  • Peng Xu,
  • Xinyi Liu,
  • Xiang Cui,
  • Junhua Li,
  • Qiuhua Liang,
  • Fuxin Chai,
  • Lan Feng,
  • Xiaosong Shu

摘要

Flash floods and debris flows pose significant threats to human safety and socioeconomic development. It is necessary to analyze the evolutionary process of flash floods and debris flows. Numerical modeling is a commonly used tool to study the evolution of disaster processes. However, existing hydrological or hydrodynamic numerical models for flash floods and debris flows often fail to effectively capture the rapid changes and complex fluid dynamics within fluvial systems, which results in low simulation accuracy. This paper innovatively constructs the HiPIMS-FLO-2D hybrid model for highly accurate simulating the compound disasters of flash floods and debris flows, and conducts a hazard assessment by integrating debris flow occurrence frequencies with multi-scenario simulations. Results show that: 1) The mean fit statistic F for flash-flood simulation was 0.8 (F ranges from 0 to 1, with larger values indicating better agreement), and the mean overall accuracy index Ω for debris-flow simulation was 1.673 (Ω ranges from -2 to 2, with values closer to 2 indicating higher accuracy). 2) High hazard areas for debris flows are primarily located in the middle of gullies and at the middle fronts of accumulation fans. Medium hazard areas are concentrated in the upper gullies and at the edges of the fans. Low hazard areas are distributed along the sides of the gullies and the wings of the fans. 3) Hipims-Flow-2D simulation accuracy is highly correlated with the DEM, and local DEM errors can affect the overall simulation accuracy. Corrections to the DEM result in a 19.05% and 13.17% improvement in the simulation accuracy for flash floods and debris flows. 4) An analysis of the different gully height hazards reveals that the differences in debris flow hazard are due to the effects of rainfall intensity and terrain slope. The HiPIMS-FLO-2D hybrid model proposed in this paper enhances the accuracy of simulations for flash floods and debris flows, providing a scientific basis for disaster prevention and management efforts.

Graphical Abstract