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This study analyzes cloud-to-ground (CG) flash patterns in Fangchenggang using ADTD lightning location system data (2012–2021). Spatially, CG flashes concentrate on the windward slopes of Mountain Range (≥ 7.5 flashes/km2 · a), forming a northwest–southeast gradient. Though high-voltage transmission lines lie in low-density zones, southeast areas with big-current events (peak > 100 kA) require attention. Temporally, annual flash frequency fluctuates. Seasonally, bimodal peaks occur in June (22.9% of annual flashes) and August (23.3%), coinciding with frontal systems and tropical cyclones. Diurnally, flashes peak at 07:00 and 16:00 due to solar heating and sea-land breeze effects. Peak current of negative strokes mainly distributed between − 30 and − 40 kA, while positive strokes show broader distributions with higher big-current probabilities. Multi-stroke flashes (25% of total) have weaker subsequent strokes than first stroke. The findings provide a scientific basis for optimizing lightning protection strategies in complex terrains to enhance power system resilience.

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Analysis of the Spatio-temporal Distribution Characteristics of Cloud-to-Ground Flash and Multi-stroke Ground Flash Activities in Fangchenggang Area

  • 会议论文

  • 发表日期：

    2026年

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  • Weijun Hu,
  • Xi Chen,
  • Yamei Liu,
  • Weixiang Huang

摘要

This study analyzes cloud-to-ground (CG) flash patterns in Fangchenggang using ADTD lightning location system data (2012–2021). Spatially, CG flashes concentrate on the windward slopes of Mountain Range (≥ 7.5 flashes/km2 · a), forming a northwest–southeast gradient. Though high-voltage transmission lines lie in low-density zones, southeast areas with big-current events (peak > 100 kA) require attention. Temporally, annual flash frequency fluctuates. Seasonally, bimodal peaks occur in June (22.9% of annual flashes) and August (23.3%), coinciding with frontal systems and tropical cyclones. Diurnally, flashes peak at 07:00 and 16:00 due to solar heating and sea-land breeze effects. Peak current of negative strokes mainly distributed between − 30 and − 40 kA, while positive strokes show broader distributions with higher big-current probabilities. Multi-stroke flashes (25% of total) have weaker subsequent strokes than first stroke. The findings provide a scientific basis for optimizing lightning protection strategies in complex terrains to enhance power system resilience.