Formation analysis and hazard assessment of the landslide-debris flow disaster chain in small watersheds of the reservoir type

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-07 DOI:10.1007/s10064-024-03929-x

Jingkai Qu, Weimin Yang, Yiguo Xue, Chunshan Zhang, Fanmeng Kong, Jiajia Li, Feipeng Wan, Siqi Ma, Haibing Tang, Chuancheng Xu

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引用次数: 0

Abstract

Frequent disaster chains from landslides and debris flows in the tectonically active southwest of the Loess Plateau significantly impact local settlement safety and economic development. This paper proposes a method that integrates a hydrological stability model for landslides with FLO-2D numerical simulation to predict the reservoir type landslide-debris flow disaster chain under various rainfall conditions, based on the amplifying effects of landslides on debris flow disasters during extreme rainfall events. The results indicate that the construction of reservoir is a key factor triggering landslides. The calculated rainfall threshold for landslide reactivation ranges from 0.0–122.1 mm/d, meaning that under a 20-year return period, 98.5% (1750.0 × 10⁴ m³) of landslides will reactivate and become material sources of debris flow. Therefore, under the influence of heavy rainfall, landslides slide into the reservoir, forming debris flows, which serve as a model for the landslide-debris flow disaster chain evolution. Simulation results for the Yuling Gully debris flow under different return periods indicate that the volume of debris flow under a 100-year return period is equivalent to the sum of volumes under both 20-year and 50-year return periods, while the area of high-hazard areas is 2.7 times greater than that under a 20-year return period. Therefore, it is crucial to emphasize the investigation of debris flow disaster chains in small watersheds that contain reservoirs, as well as to enhance disaster prevention and early warning systems to ensure public safety.

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水库型小流域滑坡-泥石流灾害链的形成分析与危害评估

在构造活跃的黄土高原西南部，频繁发生的滑坡和泥石流灾害链严重影响了当地的居民安全和经济发展。本文基于极端降雨事件中滑坡对泥石流灾害的放大效应，提出了将滑坡水文稳定性模型与 FLO-2D 数值模拟相结合的方法，预测各种降雨条件下水库型滑坡-泥石流灾害链。结果表明，水库建设是引发滑坡的关键因素。计算得出的滑坡重新激活的降雨阈值范围为 0.0-122.1 mm/d，这意味着在 20 年重现期下，98.5%（1750.0 × 104 m3）的滑坡将重新激活并成为泥石流的物质源。因此，在强降雨的影响下，滑坡体滑入水库，形成泥石流，成为滑坡-泥石流灾害链演变的模型。玉岭沟泥石流在不同重现期下的模拟结果表明，100 年一遇的泥石流体积相当于 20 年一遇和 50 年一遇泥石流体积的总和，而高危害区的面积是 20 年一遇泥石流面积的 2.7 倍。因此，重视对水库小流域泥石流灾害链的调查，加强灾害预防和预警系统建设，确保公共安全至关重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.