江西强雷电活动分布与地形及其土地利用的相关性

Extreme Lightning Activity and Its Correlation to Topography and Land Use Type

为揭示地形及土地利用类型对江西地区强雷电活动影响,本文选取闪电密度极大值和闪电平均强度极大值作为反映强雷电活动的两个主要参数,利用江西雷电监测资料、地表植被遥感以及地形高程影像文件,提取不同土地利用类型以及海拔高度、坡度和坡向参数值,重点分析强雷电活动分布与土地利用及地形的相关性。结果表明:江西强雷电活动活跃区主要分布于城乡建设用地,雷电活动的落雷概率最高,其次为耕地。闪电平均强度极大值的雷电活动集中发生在赣州及九江的丘陵和山地,其土地利用类型主要为林地,其次为耕地。影响强雷电活动分布的地形因子主要包括坡度、坡向及海拔高度。

In order to reveal the effects of topography and land use types on extreme lightning activities in Jiangxi Province,in this paper,the maximum lightning density and maximum lightning intensity are selected as the two main parameters to reflect extreme lightning activity.Based on the monitoring data of lightning and the remote sensing data of surface vegetation and topographic elevation image,the main parameters of different land use,slope and aspect are extracted.The distribution of extreme lightning activity and its correlation to land use and topography are analyzed.The results show that the extreme lightning activities mainly occurred in urban and rural construction lands,and the second is arable lands.The activities of lightning with the maximum intensity occurred in hills and mountains in Ganzhou and Jiujiang,in which the land use type is forestland mainly,and the next is arable land.The topographic factors that affect the distribution of extreme lightning activity mainly include slope,aspect and elevation.