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1. 中国地质大学(武汉)自然资源调查研究院
2. 中国地质调查局武汉地质调查中心(中南地质科技创新中心)
Published:2025
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李远耀, 汪哲涵, 居乐, et al. 湖北省秭归县降雨型滑坡连续概率阈值研究[J]. Bulletin of Geological Science and Technology, 2025, 44(6): 134-146.
李远耀, 汪哲涵, 居乐, et al. 湖北省秭归县降雨型滑坡连续概率阈值研究[J]. Bulletin of Geological Science and Technology, 2025, 44(6): 134-146. DOI: 10.19509/j.cnki.dzkq.tb20250352.
确定降雨阈值是开展滑坡危险性评价和气象风险预警的重要基础。针对临界降雨阈值空间分辨率低,区分降雨过程精度较差的问题,以湖北省秭归县为例,根据472处滑坡和58个雨量站数据,构建了有效降雨量-持续时间(E-D)临界降雨阈值;运用逻辑回归方法,以不同临界降雨阈值对应的有效降雨量(E)和持续时间(D)为自变量,时间概率(P)为因变量,拟合了区内降雨型滑坡的连续概率阈值;最后,通过历史滑坡事件和危险性评价结果,从时空2方面对阈值模型精度进行了分析和验证。结果表明:(1)区内滑坡以中小型浅层堆积层滑坡为主,降雨与滑坡事件存在显著正相关性,86.63%的滑坡发生在雨季;(2)连续概率阈值非线性拟合方程为1/P=1+e
2.0792+0.24156×D-0.04072×E
,拟合度达0.949 7;(3)基于验证集滑坡样本,滑坡发生概率为60%时,连续概率阈值模型预测精度提高17.4%,危险性评价中的4处已知滑坡危险等级均有提高。连续概率阈值对研究区滑坡灾害的预警.精度和空间辨识度更优,可为地方政府开展滑坡风险预警提供科学理论参考。
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