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<p>Transmission tower sites often experience concentrated rainfall owing to structural water collection, resulting in large-diameter raindrops that intensify soil erosion and hinder vegetation growth. This study investigated the impact of raindrops on soil loss and plant development to inform greening strategies for slope stabilization. Simulated rainfall experiments were conducted on four plant species: <i>Eragrostis ferruginea</i> (Thunb.) P. Beauv., <i>Pennisetum alopecuroides</i> (L.) Spreng., <i>Zoysia japonica</i> Steud., and <i>Cynodon dactylon</i> (L.) Pers. var. <i>dactylon</i> at design intensities of 100 and 200&#xa0;mm/h (measured intensities 79 and 163&#xa0;mm/h). Measurements of vegetation coverage, plant height, and sediment runoff revealed that soil erosion significantly decreased when vegetation coverage exceeded 40%, especially at 200&#xa0;mm/h rainfall intensity. However, erosion increased in specimens with 20–40% coverage. This may be attributed to the degradation of the vegetation sheet and soil loosening caused by rhizomes, which possibly exceeded the soil erosion control effect of the vegetation. Rainfall effects on plant growth varied by species: <i>C. dactylon</i> exhibited notable height suppression, while <i>Z. japonica</i> and <i>P. alopecuroides</i> showed minimal effects. These findings highlight the importance of maintaining high vegetation coverage and selecting appropriate species to mitigate erosion under extreme rainfall conditions. These results offer practical insights into the greening of transmission tower sites and may also inform slope greening in settings exposed to high-intensity or repeated heavy rainfall due to climate change.</p>

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Effects of intensive raindrops occurring on transmission tower sites on plants and soil erosion

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Chihiro Takeuchi,
  • Junichi Imanishi,
  • Ryo Nukina,
  • Sonoko Tsuda,
  • Kazuki Nanko

摘要

Transmission tower sites often experience concentrated rainfall owing to structural water collection, resulting in large-diameter raindrops that intensify soil erosion and hinder vegetation growth. This study investigated the impact of raindrops on soil loss and plant development to inform greening strategies for slope stabilization. Simulated rainfall experiments were conducted on four plant species: Eragrostis ferruginea (Thunb.) P. Beauv., Pennisetum alopecuroides (L.) Spreng., Zoysia japonica Steud., and Cynodon dactylon (L.) Pers. var. dactylon at design intensities of 100 and 200 mm/h (measured intensities 79 and 163 mm/h). Measurements of vegetation coverage, plant height, and sediment runoff revealed that soil erosion significantly decreased when vegetation coverage exceeded 40%, especially at 200 mm/h rainfall intensity. However, erosion increased in specimens with 20–40% coverage. This may be attributed to the degradation of the vegetation sheet and soil loosening caused by rhizomes, which possibly exceeded the soil erosion control effect of the vegetation. Rainfall effects on plant growth varied by species: C. dactylon exhibited notable height suppression, while Z. japonica and P. alopecuroides showed minimal effects. These findings highlight the importance of maintaining high vegetation coverage and selecting appropriate species to mitigate erosion under extreme rainfall conditions. These results offer practical insights into the greening of transmission tower sites and may also inform slope greening in settings exposed to high-intensity or repeated heavy rainfall due to climate change.