ISSN 1003-8035 CN 11-2852/P
    陈海龙,宋晓玲,张永军,等. 不同岩性滑坡降雨阈值探讨−以甘肃省白龙江流域为例[J]. 中国地质灾害与防治学报,2024,35(2): 1-7. DOI: 10.16031/j.cnki.issn.1003-8035.202401019
    引用本文: 陈海龙,宋晓玲,张永军,等. 不同岩性滑坡降雨阈值探讨−以甘肃省白龙江流域为例[J]. 中国地质灾害与防治学报,2024,35(2): 1-7. DOI: 10.16031/j.cnki.issn.1003-8035.202401019
    CHEN Hailong,SONG Xiaoling,ZHANG Yongjun,et al. Preliminary analysis of rainfall thresholds for landslides of different rock types: A case study of the Bailongjiang region in Gansu province[J]. The Chinese Journal of Geological Hazard and Control,2024,35(2): 1-7. DOI: 10.16031/j.cnki.issn.1003-8035.202401019
    Citation: CHEN Hailong,SONG Xiaoling,ZHANG Yongjun,et al. Preliminary analysis of rainfall thresholds for landslides of different rock types: A case study of the Bailongjiang region in Gansu province[J]. The Chinese Journal of Geological Hazard and Control,2024,35(2): 1-7. DOI: 10.16031/j.cnki.issn.1003-8035.202401019

    不同岩性滑坡降雨阈值探讨以甘肃省白龙江流域为例

    Preliminary analysis of rainfall thresholds for landslides of different rock types: A case study of the Bailongjiang region in Gansu province

    • 摘要: 降雨引发斜坡破坏的阈值是地质灾害预警的基础。本文以2004年至2019年,发生在白龙江流域甘肃段五个县区内,因长期强降雨引发的滑坡作为研究对象,采用频数法研究不同岩性特征的滑坡降雨预警阈值,构建了不同概率等级下,引发滑坡的事件降雨量(Event rainfall)与降雨历时(Duration of rainfall)之间的关系模型,并给出了下限临界累积降雨阈值。通过2020年武都区暴洪灾害引发的滑坡特征及降雨数据验证,滑坡前雨量计监测获得的累计降雨量与模型给出的临界累积降雨阈值基本相符,对持续强降雨引发的滑坡灾害的预警具有指导意义。

       

      Abstract: The research results regarding the threshold values for slope disasters caused by rainfall are crucial for geological disaster prevention. In this study, landslides induced by long-term heavy rainfall occurred in five counties within the Gansu section of the Bailong River Basin between 2004 and 2019. Using the frequency method, the rainfall thresholds for early warning of rainfall type landslides with different rock characteristics were investigated. A relationship model between Event rainfall and the Duration of rainfall leading to landslides was constructed under different probability levels, and a lower threshold for critical cumulative rainfall was provided. Through verification of landslide characteristics and rainfall data resulting from a flash flood disaster in Wudu District in 2020, the accumulated rainfall measured by the rainfall gauge before the landslide is found to be consistent with the threshold given by the model. This finding is of guiding significance for early warning of landslide disasters caused by sustained heavy rainfall.

       

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