| 雷击大地密度Ng数值研究 |
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| 引用本文： | 关久旭.雷击大地密度Ng数值研究[J].气象与环境科学,2016,39(4):135-139. |
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| 作者姓名： | 关久旭 |
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| 摘 要： | 雷击大地密度Ng作为一个重要的气象参数,直接影响雷电灾害风险评估的科学计算。Ng数值的获取有两种方式:一种是由地闪定位网络系统提供,一种是按Ng≈0.1T_d(年均雷暴日)估算。在利用后一种方法获取Ng值时,简单地取0.1T_d并非科学。因为T_d是较大区域范围的平均值,未必是雷电灾害风险评估项目所处区域的真实值;况且Ng值不仅受T_d的影响,还与雷暴时间、雷暴路径、闪电特征、雷灾频次与强度有关。因此,利用后一种方法获取Ng值时,需计入其他气象因素的影响。基于对影响Ng的各种气象因素的分析,将焦作市按行政区划定为65个区域,根据各个区域的气象环境,分析出各个区域的雷电灾害风险等级;根据风险等级,设定风险系数,并结合周边区域气象因素对该区域的影响,计算出Ng的修正系数,修正Ng的取值,使修正后的Ng值更接近真实值。
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| 关 键 词： | 雷击大地密度 风险等级 修正系数 年平均雷暴日 |
Numerical Study of Lightning Density Ng |
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| Guan Jiuxu.Numerical Study of Lightning Density Ng[J].Meteorological and Environmental Sciences,2016,39(4):135-139. |
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| Authors: | Guan Jiuxu |
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| Abstract: | The lightning density Ng, as an important meteorological parameter, directly affects the scientific calculation of the lightning disaster risk evaluation. There are two methods to get the Ng, one is calculated by ground lightning location network system, while the other is estimated by 0.1Td(annual mean thunderstorm days). The latter is not very scientific when it is simply assumed Ng is equal to 0.1Td, as Td is the average value in large areas, not always the actual value in the area of lightning disaster risk evaluation. Moreover, the value of Ng is not only affected by Td, but also affected by thunderstorm time, thunderstorm path, lightning characteristics, and lightning disaster frequency and intensity. Therefore, when we obtain Ng by the latter method, other meteorological parameters should be considered. Based on the analysis of meteorological parameters affecting Ng, Jiaozuo is divided into 65 regions. According to the different meteorological environments, lightning disaster risk grade in each region can be calculated. And the lightning disaster risk coefficient can be determined by risk grade. Combining with the effects of surrounding areas on the area, the correction factor of Ng can be calculated to correct the value of Ng, and make the Ng after correction closer to the actual value. |
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| Keywords: | lightning density risk grade correction factor annual mean thunderstorm days |
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