华南地质2025，Vol.41Issue(3)：571-579,9.DOI:10.3969/j.issn.2097-0013.2025.03.008
基于I-D阈值的华南花岗岩分布区滑坡灾害降雨预警模型
Rainfall Warning Model for Landslide Disasters in Granite Distribution Areas of South China Based on I-D Threshold:A Case Study of Oujiang Town,Guidong County,Hunan Province
摘要
Abstract
Granite is widely distributed in southern China,and rainfall-induced landslides associated with weathered granite layers occur frequently,posing a serious threat to the safety of residents'lives and property in the area.Determining rainfall thresholds for landslide early warning based on the historical correlation between rainfall and landslide events is essential for the risk management of rainfall-induced landslides.Using daily rainfall records from 1957 to 2023 and 104 documented landslide cases in Oujiang town,Guidong county,Hunan province,this study established an I-D threshold model that couples instantaneous daily rainfall(R0)with 3-day effective antecedent rainfall(R3)and proposed a four-level landslide early-warning model.The results indicate that a blue alert is triggered when R0≥13 mm or R3≥30 mm;a yellow alert for R0≥28 mm or R3≥55 mm;an orange alert for R0≥62 mm or R3≥125 mm;and a red alert for R0≥105 mm or R3≥250 mm.The findings provide a scientific basis and transferable paradigm for refined risk control and early warning of rainfall-triggered landslides in granite terrains of south China.关键词
I-D模型/降雨阈值/降雨型滑坡/有效降雨量/花岗岩地区/华南Key words
intensity-duration/rainfall threshold/rainfall-induced landslide/effective rainfall/granite region/South China分类
地质学引用本文复制引用
连志鹏,陈宇,厉一宁,刘磊,闫举生,裴来政,章昱..基于I-D阈值的华南花岗岩分布区滑坡灾害降雨预警模型[J].华南地质,2025,41(3):571-579,9.基金项目
中国地质调查局项目(DD20230444) （DD20230444）
