Effect of Topographical Factors in Zoning of Lightning Disaster-causing Hazard

Abstract:
Topography is one of the key factors in lightning disaster risk assessment and zoning. In accordance with the technical route of the national meteorological disasters comprehensive risk survey, using the lightning location data from 2010 to 2020, digital elevation data, soil conductivity data, as well as lightning disaster data in Anhui Province of China, the impact of topographical factors on lightning parameters and hazard factors were analyzed. the sensitivity of lightning disaster-pregnant environment and disaster-causing hazard model were constructed, and zoning of lightning disastercausing hazard in Anhui Province was completed accordingly. The results show that: the ground strike point density in Anhui Province generally increases with the increase of altitude and relief amplitude, and altitude and relief amplitude have positive driving effect on the risk of lightning disaster. The amplitude concentration of negative lightning current is higher than that of positive lightning current. And the proportion of positive ground lightning and the amplitude of lightning current in the Dabie mountain and southern mountainous areas in Anhui Province are lower than those in the plain areas. The sensitivity of lightning disaster-pregnant environment in Anhui Province is closely influenced by topographical factors, with higher sensitivity in mountainous areas, along the Yangtze River, and some of the Huai River basin. Considering the disaster factor and the disaster-pregnant environment, it is found that the lightning disaster high-risk areas are mainly located in most of the areas along the Yangtze River and southern mountainous areas in Anhui Province. The sub high-risk areas are mainly located in the some areas of southern mountainous, middle of the Jiang-huai region and along the Jiangnan, The sub low and low-risk areas are mainly located in the plain and hilly areas in the northern region and the Jiang-huai region.