基于EOF方法的江西电网雷电时空分布特征分析

Analysis of the Lightning Temporal and Spatial Distribution Feature in Jiangxi Grid Based on EOF Methods

根据江西省雷电定位系统2012年至2014年的LLS监测数据,采用经验正交分解方法,分析研究了江西省雷电时空分布特点,得出主要的空间特征向量及其对应的时间系数。结果表明,近3a夏半年雷电活动的空间分布特征以经向型为主,南部及山区雷电活动频繁。对空间特征向量所对应的时间系数的分析发现,江西近3a夏半年雷电活动总体呈增长趋势,时间系数间存在较强的相似特征,表明区域雷电活动具有一定的时空延续性。

According to the LLS monitoring data of lightning location system in Jiangxi province from 2012 to 2014, by using empirical orthogonal decomposition method, the characteristics of temporal and spatial distribution of lightning in Jiangxi are studied and analyzed, the corresponding time coefficients of the main features and the vector space are obtained. The results show that, the spatial distribution of recent 3A summer lightning activity are mainly meridional type , and the lightning activity is frequent in southern part and mountain area. Through the analysis of time coefficients corresponding to the feature vector space, it is found that the lightning activity showed a rising trend in Jiangxi for recent 3A summer, There is a strong similar characteristics between time coefficient, it shows that the regional lightning activity has a certain continuity of time and space.