基于DEM数据的长沙地区地形因子与地闪活动关系研究  

Relationship between terrain factors and ground lightning activity in Changsha area based on DEM data

作　　者：周明薇 刘越屿 黄浩 胡欣 刘为 ZHOU Ming-wei;LIU Yue-yu;HUANG Hao;HU Xin;LIU Wei(Hunan Meteorological Disaster Prevention Technology Center,Changsha 410007,China;Key Laboratory of Meteorological Disaster Prevention and Mitigation in Hunan Province,Changsha 410118,China)

机构地区：[1]湖南省气象灾害防御技术中心,湖南长沙410005 [2]气象防灾减灾湖南省重点实验室,湖南长沙410118

出　　处：《气象与环境学报》2022年第6期106-111,共6页Journal of Meteorology and Environment

基　　金：湖南省气象局重点课题(XQKJ19A002)资助。

摘　　要：利用2009—2018年长沙地区地闪定位资料和30 m精度高程数据,通过数理统计、回归分析等方法,分析地闪参数的空间分布特征,建立基于地表因子的单位面积年均地闪回击频次模型、平均电流强度模型。结果表明:地闪回击主要发生在平原和丘陵。随着海拔高度的增加,长沙地区地闪回击频次呈减少趋势,地闪平均电流强度呈上升趋势。电流强度主要集中在25~65 kA,其中发生在平原的地闪占比为77.84%。应用2019年闪电数据对模型进行检验表明,单位面积年均地闪回击频次的模型计算值小于观测值,误差平均值为9.20%;平均电流强度模型计算值偏高,与观测数据之间的误差平均值约为4.40%。Based on the ground lightning location data and 30-m precision elevation data in Changsha area from 2009 to 2018,the spatial distribution of ground lightning parameters was analyzed using mathematical statistics and regression analysis,and an annual average return strike frequency model and an average current intensity model for ground lightning per unit area were established based on surface factors.The results showed that ground lighting strikes mainly occur on plains and hills.With the increase in altitude,the return strike frequency of ground lightning in Changsha area decreases,and the average current intensity of ground lightning exhibits an increasing trend.The current intensity is mainly concentrated within the range of 25~65 kA,of which 77.84%occur in the plain.We used the lightning data in 2019 to test the model and found that the calculated value of annual return strike frequency per unit area is smaller than the observed value,with an average error of 9.20%.The average current intensity model has overestimation compared with observations,with an error of about 4.40%.

关 键 词：地闪频次 电流强度 地形因子 高程数据 

分 类 号：P427.3[天文地球—大气科学及气象学]