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山地高湿环境下闪电活动的时空分布特征研究

Study on the Spatial and Temporal Distribution Characteristics of Lightning Activity in High-Humidity Environments of Mountainous Regions

  • 摘要: 闪电活动受地形与湿度共同影响,山地高湿环境下尤为复杂。本研究基于中国气象局闪电定位数据及CMA-RA再分析产品,选取山西朔州(高海拔山地)和江西九江(山地-湖泊)两个风电场,分析闪电时空分布特征。结果表明:山西风电场闪电集中于1,500 m以上山脊,密度达12~15次/(km2·年),低海拔山谷仅5次/(km2·年);江西风电场闪电高发于鄱阳湖周边低洼湿润区,密度25~72次/(km2·年),丘陵地区(>500 m)仅为10~15次/(km2·年)。湿度相关性方面,山西年均湿度40%~60%,与闪电密度相关性极弱(r=0.035, p=0.914);江西年均湿度65%~80%,呈一定正相关(r=0.451, p=0.141)。本研究为风电场雷电设计、防护等提供了科学依据。

     

    Abstract: Lightning activity is modulated by terrain and humidity, particularly in high-humidity mountainous regions. Using lightning location data from CMA and CMA-RA reanalysis, this study examines two wind farms in Shuozhou, Shanxi (high-altitude mountainous) and Jiujiang, Jiangxi (mountain-lake). Results show that lightning in Shanxi concentrates on ridges above 1,500 m with density of 12–15 flashes/(km2·yr), versus 5 flashes/(km2·yr) in low valleys (<1,400 m). In Jiangxi, high-incidence areas around Poyang Lake lowlands reach 25–72 flashes/(km2·yr), far exceeding 10–15 flashes/(km2·yr) in hilly areas (>500 m). Humidity correlations differ: Shanxi (annual RH 40%–60%) shows weak correlation (r=0.035, p=0.914), while Jiangxi (RH 65%–80%) exhibits moderate positive correlation (r=0.451, p=0.141). This study provides a scientific basis for design and lightning protection of wind farms.

     

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