浙江省地闪密度图的绘制方法及其有效性验证

Drawing Methods and Validity for Cloud-to-ground Flash Density Map of Zhejiang Province

为绘制、研究浙江省地闪密度分布图,选取浙江省雷电定位系统积累的2004～2006年雷电定位系统监测数据为研究样本,提出了利用海量雷电自动监测数据绘制出高分辨率地闪密度图的方法—网格法;依据网格的地闪密度值采用自然分割法将全省区域划分为5级雷区,最终形成了浙江省1km分辨率5级分色地闪密度图。通过分析浙江省地形情况,得出了地闪密度空间分布与地形季风相关性较强的结论;通过分析2004～2006年浙江电网雷击故障点与各级雷区的位置相关性,得出了故障次数与雷区等级正相关的结论,从而验证了地闪密度图的有效性。

In order to draw and study the cloud-to-ground flash density map, the monitoring lightning data in 2004- 2006 of Zhejiang Lightning Location System is selected as study samples, and the method--Grid Method for drawing high resolution cloud-to-ground flash density map using vast automatic monitoring data is presented. Based on flash density value of each grid, Jenk＇s Natural Breaks classification method is adopted to determine the natural arrangement of these values into five classes, eventually formed the cloud-to-ground flash density map of Zhejiang with 1kin resolution with five grades. Through the terrain of Zhejiang Province, it＇s found that the cloud-to ground flash density spatial distribution is closely relevant with the character of terrain and monsoon. By comparing Zbejiang power grid lightning-stroke fault points in 2004-2006 with the flash density ranks, the conclusion that the lightningstroke fault number is positively correlated with the lightning ranks is gotten, which show off the effectiveness of the cloud-to-ground flash density map.