关键词: 低温雨雪冰冻灾害, 高速公路, ArcGIS, 风险评估, 风险区划

Abstract: Highway was taken as the division object in this paper.Based on the conventional observation data from 68 weather stations in Zhejiang province and combined with the geographic information,social and economic,and traffic accident data,the risk assessment index sets were established on the basis of the analysis of disaster-causing factors,risk exposure index and characteristics of traffic accidents on highway from 2004 to 2013.The risk division and assessment of low-temperature,rain/snow and freezing disasters on highway in Zhejiang province were performed using methods of ArcGIS spatial analysis technique,weighted comprehensive evaluation and hierarchy analysis.The results show that it is divided into five categories of risk,i.e.,higher,sub-high,medium,inferior and lower risks on highway in Zhejiang province.The higher risk road length accounts for 13.49% of the total value.The higher risk sections are mainly located in Hang-Jingxin highway Jiande,Hang-Rui highway from Hangzhou to Lin'an,Hu-Yu highway Huzhou,Shen-Jiahu highway Huzhou,Lian-Hang highway from Deqing to Yuhang,Chang-Shen highway Hangzhou city and from Huzhou to Yuhang,Hang-Jinqu highway Quzhou,Zhu-Yong highway from Dongyang to Pan'an,and Tai-Jin highway Jinyun ones.This study provides a scientific reference for the highway management department to prevent and mitigate disasters.

Key words: Low-temperature,Rain/snow and freezing disasters, Highway, ArcGIS, Risk assessment, Risk division