苏州地区雷电分布规律及对农村安全的影响

利用苏州地区2002年到2007年闪电定位系统监测资料，分析了该地区地闪空间和时间分布特征。结果表明，苏州市区、北部张家港地区是闪电频发的中心地带，太湖流域和苏州市区是强雷电流多发区。而就雷电的时间分布规律而言，苏州地区平均雷暴日的年变化基本上呈正态分布，在夏季达到峰值。闪击次数日变化呈双峰分布，上午10时左右是闪电最少时段，峰值出现在凌晨2时和下午19时，其中19时为日均最高值。夏季19时左右是该地区强对流天气最易发展成熟的时段。同时，还分析了苏州地区农村防雷的现状，发现造成目前雷灾频发的原因既有自然地理位置的因素，也有人为方面的原因，并针对农村安全提出了合理选择防雷设计参数和加强雷电预警预报工作两点建议.

DISTRIBUTION CHARACTERISTICS OF LIGHTNING AND ITS EFFECT TO COUNTRY SAFETY IN SUZHOU

Based on the data of Lightning Location System (LLS) from 2002 to 2007 in Suzhou，the spatial and temporal characteristics of cloud to ground lightning (CG) were analyzed.The results show that the lighting activity is more frequent in Suzhou and Zhangjiagang.The CG lightning in Taihu area and Suzhou city have stronger lightning currents.The thunderstorm days in Suzhou change as the normal distribution，and there are the most thunderstorm days in summer in Suzhou.The daily stroke numbers change as the double peak distribution，fewer lightning activity occurs at about 10〖DK〗∶00 am，the most of the CG lightning occur at 02〖DK〗∶00 am and 07〖DK〗∶00 pm，and the peak value of the lightning activity appears at 07〖DK〗∶00 pm.Most mesoscale convective systems (MCS) appear at about 07〖DK〗∶00 pm in summer.Also，the lightning protection in country of Suzhou was analyzed in this paper.It was found that the reasons of lightning disasters include not only the geographical position but also human factors.Two suggestions about country safety were presented，the lightning protection design parameter should be properly chosen and the lighting forecasting should be strengthened.