泰山风景区闪电特征及林区雷击火灾风险分析

采用2007-2018年山东省闪电定位系统监测数据,分析泰山风景区地闪密度、地闪强度、地闪年、月、日变化特征及其林区雷击火灾风险高值区域。研究表明:泰山风景区年均地闪密度为1.82次/(km^2·a),桃花源景区以东、南天门以北区域属于地闪密度极值区;地闪活动季节性分布特征明显,8月最频繁,4月正闪占比最高,日变化特征为高峰时段14∶00-17∶00和19∶00-21∶00;地闪平均电流强度为11.91 kA,最大地闪强度出现在中天门附近,电流强度达-116.834 kA;南天门、桃花峪、桃花源、天烛峰、巴山林区所在区域雷击火灾风险较高。

Lightning Characteristics and Forest Fire Risk Caused by Lightning in Mount Tai Scenic Area

Based on the monitoring data of lightning positioning system in Shandong Province from 2007 to 2018,this paper analyzed the characteristics of the density,intensity,annual,monthly and daily variation of cloud-to-ground lightning and the high risk area of lightning fire in Mount Tai Scenic Area.The results showed that the annual average density of cloud-to-ground lightning was 1.82 times/(km^2·a),and the east of Taohuayuan Scenic Spot and the north of Nantianmen belonged to the extreme areas of lightning density.The seasonal distribution characteristics of lightning activity were obvious,the most frequent in August,the highest proportion of positive lightning in April,and the peak periods of daily lightning activity were 14∶00-17∶00 and 19∶00-21∶00.The average current intensity of cloud-to-ground lightning was 11.91 kA,the maximum lightning intensity reached-116.834 kA near Zhongtianmen.The risk of lightning fire in the forest areas of Nantianmen,Taohuayu,Taohuayuan,Tianzhufeng and Bashan was higher.