Abstract:
Based on the data of lightning monitoring system in Aba from 2013 to 2017, this paper conducts research on risk zoning of four lightning disaster risk factors including sensitivity of disaster-inducing environment, risk of disaster-inducing factors, risk vulnerability of disaster-bearing body and capacity of disaster prevention and mitigation. The result show that: The lightning disaster risk zoning of Aba can be obtained according to five grades, includeing high, sub-high, medium, sub-low and low. The risk value of lightning disaster decreases from southeast to west and south, the sub-high to high-risk areas are mainly concentrated in the southeast of the city, and the high-risk areas are mainly distributed in the southeast of Wenchuan County, Maoxian County, Lixian County, the northeast of Jiuzhaigou, and the middle of Ruoergai County. Sub-high to high-risk areas are either the main flow area of rivers, or due to the following factors, such as relatively high rainfall frequency, low terrain, vulnerable disaster-bearing body and weak ability to resist disasters, so they have higher risk of lightning disasters. In the west, Rangtang County, Aba County, Jinchuan County, Hongyuan County, Xiaojin County, Songpan County and other regions are low to sub-low risk areas, for they are less likely to be affected by lightning disasters due to relatively small lightning frequency, weak damage, or relatively high altitude or low production level. The rest of the city is in the medium risk area.