长沙市土地覆盖类型与雷电特征的相关性分析  

Correlation Analysis of Land Cover Types and Lightning Features in Changsha City

作　　者：王少娟 王道平 刘凤姣 周明薇 郭斌 贺秋艳 WANG Shaojuan;WANG Daoping;LIU Fengjiao;ZHOU Mingwei;GUO Bin;HE Qiuyan(Hunan Key Laboratory of Meteorological Disaster Prevention and Mitigation,Hunan Meteorological Disaster Prevention Technology Center,Changsha 410007,China)

机构地区：[1]湖南省气象灾害防御技术中心气象防灾减灾湖南省重点实验室,湖南长沙410007

出　　处：《防灾科技学院学报》2021年第2期79-85,共7页Journal of Institute of Disaster Prevention

摘　　要：为研究土地覆盖类型与雷电特征的相关性,利用长沙市2009-2018年地闪定位资料和欧空局300 m精度土地覆盖类型数据,通过数理统计等方法,研究雷电活动在不同地表覆盖类型的分布特征,分析地闪频次和平均电流强度与各土地覆盖类型因子的相关性。结果表明:地闪频数与各土地覆盖类型占地面积成正比,其中耕地上地闪频数最多,草地最少;除草地上地闪活动月变化具有“双峰单谷”特征外,其他类型上均呈“单峰”型;各土地覆盖类型上的地闪活动日变化呈单峰型变化特征,水体和草地上的地闪活动午后波动较为剧烈;地闪活动最活跃区域位于城镇建设用地上,平均闪电密度值较高的土地覆盖类型其雷电流强度却相对较弱;耕地占地面积与地闪频次和平均电流强度呈正相关关系。In order to study the correlation between land cover types and lightning characteristics,using the lightning location data of Changsha City and the 300 m precision land cover type data of ESA from 2009 and 2018,we studied the distribution characteristics of lightning activities in different land cover types by mathematical statistics method,and analyzed the correlation between lightning frequency,average current intensity and land cover type factors. The results are shown in the following:( 1)The lightning frequency is directly proportional to the land area of different land cover type,in which cultivated land is the most,and that on grassland is the least.( 2) The monthly changes of lightning activity on grassland has the characteristics of"double peaks and single valley",while that in all the other types have the characteristics of"single peaks".( 3) The diurnal variation of lightning activity in all land cover types features a single-peak change,and that on water bodies and grasslands fluctuates sharply in the afternoon.( 4) The lightning activity mainly occurs in urban construction land,but the lightning current intensity of land cover type with higher average lightning density is relatively weak.( 5) The area of cultivated land has a positive correlation with the frequency and average current intensity of lightning.

关 键 词：地闪定位 欧空局 土地覆盖类型 雷电活动分布 相关性 

分 类 号：S761.5[农业科学—森林保护学]