雷击大地密度的计算与软件实现

雷击大地密度（Ng）是进行雷击风险评估的重要参数之一。雷击风险评估业务的传统方法中，通常采用当地气象部门提供的所在城市的年平均雷暴日（Td）来计算评估点的Ng值，而雷击分布受地理、地质、土壤、气象、环境等诸多因素的影响，因此，在一个城市甚至一个地区都取相同的Ng值的做法存在一定的局限性。从Ng的概念出发，对标定后的闪电定位系统（LLS）数据进行处理，使用C^#编程制作计算Ng的软件，以便快捷、精确地为雷击风险评估业务提供Ng的数据支持。

Calculation and Software Implementation of Ground Lightning Flash Density

Ground lightning flash density Ng is one of most important parameters in lightning risk assessment. The conventional method of lightning risk assessment is to adopt the observed annual mean number of thunder days （Td） from local meteorological stations to calculate Ng and consider it a constant for one city or even a certain area, which is of certain limitations as the distribution of lightning is depended on the topographical, geological, edaphic, meteorological, and environmental features. Based on the conception of Ng, the processed data from the calibrated lightning location system and the calculated Td by Kriging interpolation, a corresponding program is developed by the C# language to obtain more reliable values of Ng in a more convenient way for the use of lightning risk assessment.