南充市地质灾害分型及致灾雨量阈值研究  

Study on Classification of Geological Disasters and Threshold of Hazard Rainfall in Nanchong

作　　者：付世军[1,2] 李晓容 文敏[3] 刘慧君 鲜铁军 Fu Shijun;Li Xiaorong;Wen Min;Liu Huijun;Xian Tiejun(Nanchong Meteorological Bureau,Nanchong 637000,China;Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072,China;Land and Resources Bureau in Nanchong,Nanchong 637000,China)

机构地区：[1]南充市气象局,四川南充637000 [2]高原与盆地暴雨旱涝灾害四川省重点实验室,四川成都610072 [3]南充市国土资源局,四川南充637000

出　　处：《防灾科技学院学报》2018年第3期73-80,共8页Journal of Institute of Disaster Prevention

基　　金：南充市科技局科技计划项目(16YFZJ0144);南充市重大气象灾害预警与评估协同创新团队研究项目(2016002)

摘　　要：南充是四川地质灾害隐患点分布较多的地区之一,探索雨量与地质灾害的关系,进行提前预警,显得尤为重要。利用2000—2017年南充228个加密自动站和大监站观测资料,结合地质灾情数据,使用基于衰减系数计算有效降雨量与降雨强度(I)-历时(D)关系阈值相结合的方法,对不同致灾降雨类型进行分型判断,开展不同时效雨量阈值研究。分析发现:大约有72.6%的地质灾害是主要由降雨因素诱发,其中主要由短期降水引发的占77.3%。短期和中长期降雨型地质灾害的易发区分别为西北部和偏南地区,而西北部地质脆弱山区和水库流域对短时强降雨最为敏感。Nanchong is one of the areas with more geological hazards in Sichuan. So it is very important to find therelationship between rainfall and geological hazards in Nanchong to make early warning. Based on the observation dataof 228 dense automatic stations and monitoring stations in Nanchong from 2000 to 2017, combined with the geologicaldisaster data, we classified different types of disaster rainfall by a method of combining the calculated effective rainfallbased on attenuation coefficient with rainfall intensity （ I）-time （D） relation threshold, and studied threshold ofrainfall in different duration. It is found that about 72.6% of geological disasters were mainly caused by rainfall, ofwhich 77.3% were mainly caused by short-term rainfall. The geological hazards prone areas caused by short-term andlong-term rainfall were mainly distributed in northwest and south of Nanchong, while the vulnerable mountain area and the reservoir basin in the northwest Nanchong were most sensitive to the effects of short-term heavy rainfall.

关 键 词：降雨型地质灾害 致灾雨量阈值 有效降雨量 关系阈值 插值 

分 类 号：P694[天文地球—地质学]