Research on the Variation of Lightning Activity Parameters with Land Types Based on Lightning Location System

The statistics of lightning activity parameters is the basis to guide the lightning protection design, transformation and study of lightning characteristics of transmission lines. The lightning activity parameters are closely related to the land type. Based on the ground lightning data of lightning location system in Hainan Island, combined with the land type data from resource and environmental science and data center, this paper uses ArcGIS geographic software to supplement the land type data of ground flash point, and studies the law of lightning activity parameters and land types, such as mean value of lightning current amplitude, ground lightning density, cumulative probability distribution of lightning current amplitude, positive lightning ratio and so on. The study shows that the average amplitude of total lightning current in paddy field is the largest; due to the heat island effect, the total land flash density, negative ground flash density and positive ground flash density of urban land are much higher than those of other land types, and more attention should be paid to the transformation of forest land lightning protection measures; the median current of cultivated land is the largest, and the probability of larger amplitude lightning current is the largest. The proportion of positive flashover in lakes is the largest, so the influence of positive lightning on lightning shielding of transmission lines should be properly considered.