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2025 Vol. 46, No. 2
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XU Dengcai, ZHANG Taili, HEI Lisha, WANG Yiming. 2025. Study on rainfall threshold of geological disasters based on effective rainfall model in Wenzhou City. East China Geology, 46(2): 252-267. doi: 10.16788/j.hddz.32-1865/P.2025.02.012
Citation: XU Dengcai, ZHANG Taili, HEI Lisha, WANG Yiming. 2025. Study on rainfall threshold of geological disasters based on effective rainfall model in Wenzhou City. East China Geology, 46(2): 252-267. doi: 10.16788/j.hddz.32-1865/P.2025.02.012
shu

Study on rainfall threshold of geological disasters based on effective rainfall model in Wenzhou City

  • 1.

    Geological Environment Monitoring Center, Wenzhou Natural Resources and Planning Bureau, Wenzhou 325027, Zhejiang, China

  • 2.

    Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China

  • 3.

    Key Laboratory of Watershed Eco-Geological Processes, Ministry of Natural Resources, Nanjing 210016, Jiangsu, China

  • 4.

    College of Civil Engineering, Tongji University, Shanghai 200092, China

  • 5.

    College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325000, Zhejiang, China

More Information
Received Date:  28 February 2025
Revised Date:  21 April 2025
Accepted Date:  21 April 2025
Publish Date:  28 June 2025
    Abstract

  • Wenzhou is located in the coastal area of southeast China, where frequent occurrences of extreme rainfall have resulted in a high incidence of geological disasters over the years. This study collects the historical geological disasters and rainfall data of Wenzhou (a total of 2692 geological disaster samples, of which 2 615 are accurately dated to the month, spanning from 1905 to 2023) to analyze the development, spatio-temporal distribution patterns of geological disasters, and their relationship with rainfall. Based on the effective rainfall model, we statistically analyzed the rainfall thresholds of different types of geological disasters in Wenzhou. The results show that the geological disasters in Wenzhou are mainly classified into two categories: the cluster disasters triggered by typhoon-rainstorm and the single-point sudden disasters. Among them, the cluster disasters triggered by typhoon-rainstorm is closely related to typhoon rainstorm activities, and strongly correlated with rainfall extreme, while the single-point sudden geological disasters has less correlation with heavy rainfall. The statistical analysis derives the intensity–duration (I-D) curves of rainfall thresholds at various probabilities for cluster landslide and debris flow disasters triggered by typhoon-rainstorm in Wenzhou. Additionally, it recommends rainfall-threshold values for different types of geological disasters in Wenzhou. This study provides theoretical support and scientific evidence for early warning of geological disasters in Wenzhou, which has significant practical importance and application value.

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