基于I-D-R阈值模型的滑坡气象预警
刘谢攀 , 殷坤龙 , 肖常贵 , 陈丽霞 , 曾韬睿 , 李烨 , 刘真意 , 龚泉冰 , 陈卫群
地球科学 ›› 2024, Vol. 49 ›› Issue (03) : 1039 -1051.
基于I-D-R阈值模型的滑坡气象预警
Meteorological Early Warning of Landslide Based on I-D-R Threshold Model
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建立滑坡灾害多维度气象预警判据和划分“网格化”预警单元能够为滑坡灾害气象预警提供科学依据.本文以浙江省金华市磐安县205个降雨型滑坡为研究对象,首先,基于平均有效降雨强度‒降雨历时(I-D)阈值模型,采用普通最小二乘回归(OLSQ)和分位数回归(QR)划分临界阈值曲线;其次,引入当日降雨量(R),进一步优化 I-D阈值模型,建立I-D-R阈值模型,采用不同参数估计方法对比不同阈值模型精度,选择最优阈值模型作为磐安县滑坡灾害气象预警判据;最后,基于降雨分布的差异性,在划分地形单元的基础上利用泰森多边形(VD)建立了乡镇级别的“网格化”预警单元.结果显示:(1)I-D-R阈值模型相比于I-D阈值模型具有更好的预警精度,且基于QR的I-D-R阈值模型效果更好,警告及以上阈值等级精度提升到50%,特别注意及以上阈值等级精度提升到88.9%;(2)采用基于QR的I-D-R降雨阈值作为磐安县51个预警单元四级气象预警(红、橙、黄、蓝)的判据,并提出相应的应急响应措施.研究成果提供了一种新的阈值模型,能够为磐安县区域气象预警提供借鉴与参考.
滑坡 / 气象预警 / 降雨阈值 / 最小二乘回归 / 分位数回归 / I-D-R阈值模型 / 工程地质
landslide / meteorological early warning / rainfall threshold / ordinary least square regression / quantile regression / I-D-R threshold model / engineering geology
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磐安县地质灾害风险隐患双控试点(预警系统科研项目)(PACG2021-CS-002)
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