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第 50 卷 第 9 期                     武 汉 大 学 学 报( 信 息 科 学 版 )                          Vol.50  No.9
                2025 年 9 月                Geomatics and Information Science of Wuhan University      Sept. 2025


                       引文格式:李昊宇,许强,李品良,等 . 降雨数据稀缺山区地质灾害的降雨阈值研究——以茂县为例[J]. 武汉大学学报(信息科
                       学版),2025,50(9):1878-1887.DOI:10.13203/j.whugis20240075
                       Citation:LI Haoyu,XU Qiang,LI Pinliang,et al.Rainfall Thresholds for Geological Disasters in Rainfall Data-Scarce Mountain⁃
                       ous —— A Case Study of Mao County[J].Geomatics and Information Science of Wuhan University,2025,50(9):1878-1887.DOI:
                       10.13203/j.whugis20240075

                       降雨数据稀缺山区地质灾害的降雨阈值研究

                                                ——以茂县为例



                                 李昊宇   许           强   李品良   巨袁臻   蒲川豪                     1
                                                                               1
                                                      1
                                          1
                                                                   1
                                 1  成都理工大学地质灾害防治与地质环境保护全国重点实验室,四川  成都,610059
                摘  要:降雨诱发地质灾害导致大规模人员财产损失,建立降雨阈值可有效降低地质灾害的危害性,而在数据稀缺山区,
                缺乏雨量信息来构建降雨阈值。因此,对全球降水计划数据产品进行降尺度处理,并利用雨量站验证其数据的有效性。
                结合灾害数据提取降雨事件,采用频率法建立茂县地区不同灾害、不同精度的临界阈值,并分析了震后阈值曲线随年份
                的演变规律。结果表明:(1)降尺度处理可有效提高降雨产品的空间分辨率和捕捉降雨能力;(2)茂县地区的降雨型滑坡
                主要受长时弱降雨控制,而泥石流主要受短时强降雨控制,假设累积降雨量为 E,降雨历时为 D,则临界阈值方程分别为:
                                              0.24
                E = 4.17D (8<D<868), E = 3.93D (10<D<441);(3)降尺度后的降雨阈值较未降尺度的阈值低,临界阈值 E 的方
                         0.18
                程可表示为: E = 3.96D (4<D<736), E = 4.09D (8<D<868);(4)震后茂县地区诱发地质灾害的降雨事件由长时
                                                        0.19
                                   0.21
                弱降雨转变为短时强降雨控制,降雨阈值随时间推移呈增大趋势。该研究对于茂县地区降雨型地质灾害的防灾减灾工
                作具有科学指导。
                关键词:地质灾害;降雨阈值;全球降水计划;降尺度;频率法
                中图分类号:P237          文献标识码:A                             收稿日期:2024⁃06⁃21
                DOI:10.13203/j.whugis20240075                           文章编号:1671⁃8860(2025)09⁃1878⁃10

                     Rainfall Thresholds for Geological Disasters in Rainfall Data-Scarce
                                    Mountainous : A Case Study of Mao County


                                      1
                            LI  Haoyu    XU  Qiang    LI  Pinliang    JU  Yuanzhen    PU  Chuanhao  1
                                                   1
                                                                                1
                                                                1
                 1  State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
                Abstract: Objectives: Rainfall-induced geological disasters often result in significant human and property
                losses, and rainfall thresholds can effectively reduce the hazards of geological disasters. However, limited
                rainfall data in mountainous areas lead to low accuracy of rainfall thresholds. Establishing rainfall thresholds
                in mountainous areas with scarce data is an unresolved problem. Methods: We downscale global precipita⁃
                tion measurement (GPM) data to the resolution of 1 km and verify its validity with ground station  rainfall.
                By  combining  disaster  data,  we  extract  rainfall  events  and  obtain  critical  thresholds  for  different types of
                disasters and different precisions in Mao County based on the frequency method. Furthermore, we also ana⁃
                lyze  the  evolution  of  the  threshold  curves  over  the  years  following  the  earthquake.  Results:  Rainfall-in⁃
                duced  landslides  in  Mao  Country  area  are  primarily  controlled  by  long-duration weak rainfall, while de⁃
                bris flows are dominated by short-duration intense rainfall. Assuming cumulative rainfall is E and rainfall
                duration is D, the critical threshold equations are: E = 4.17D  0.18  (8<D<868) and  E = 3.93D  0.24  (10<D<
                441). The rainfall threshold after downscaling is lower than the unscaled threshold, and the critical thresh⁃
                old equation can be expressed as: E = 4.09D  0.19  (8<D<868) and E = 3.96D  0.21  (4<D<736). The rainfall


                基金项目:国家重点研发计划(2022YFC3003200)。
                第一作者:李昊宇,硕士生,从事区域地质灾害监测预警研究。2289806387@qq.com
                通信作者:许强,博士,教授。xq@cdut.cdut.edu.cn
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