Problems arising from heatwaves and urban heat islands (UHIs) exacerbated by climate change have prompted diverse adaptation strategies. Although green infrastructure, which positively affects climate change adaptation, has been extensively evaluated, global-scale assessments of UHIs indicate that green infrastructure may not be sufficient to mitigate UHIs in humid regions with annual precipitation exceeding 1000 mm or summer precipitation exceeding 570 mm. However, these assessments primarily focused on UHIs; different results may be obtained for individual heat comfort. As relative humidity increases, the cooling effect of green areas potentially decreases. This suggests the need for additional studies on the impact of short-term precipitation, which increases relative humidity and induces cooling effects on green infrastructure. Korea experiences a humid summer due to the concentration of precipitation (approximately 711 mm of summer precipitation); thus, the contribution of green infrastructure to improving heat comfort might be limited. Therefore, this study investigated the impact of green infrastructure on thermal comfort in relation to precipitation levels using the Wet-Bulb Globe Temperature (WBGT) index and data from weather stations in Korea. Precipitation intensity was categorized into 2-day periods and 10 mm/day. Subsequently, thermal comfort was compared for summers from 1993 to 2022 according to the green infrastructure ratio around the stations. The results indicated that green infrastructure had a cooling effect on clear days but only had a cooling effect on precipitation days when the level of green infrastructure was above the critical ratio. Additionally, green infrastructure reduced the WBGT index if minimal precipitation occurred during the five-day cooling period following precipitation. While green infrastructure remains crucial for climate change adaptation, other strategies must be implemented to improve the thermal environment, particularly in areas with frequent precipitation.

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评估绿色基础设施对与湿度相关的热舒适度的影响：韩国案例研究

气候变化加剧了热浪和城市热岛（UHI）带来的问题，促使人们采取多种适应策略。尽管对气候变化适应产生积极影响的绿色基础设施已得到广泛评估，但全球范围的城市热岛评估表明，绿色基础设施可能不足以缓解年降水量超过1000毫米或夏季降水量超过570毫米的潮湿地区的城市热岛。然而，这些评估主要关注城市热岛（UHI）；对于不同的热舒适度可能会得到不同的结果。随着相对湿度的增加，绿地的冷却效果可能会降低。这表明需要对短期降水的影响进行更多研究，短期降水会增加相对湿度并导致对绿色基础设施的冷却效应。韩国由于降水集中（夏季降水量约711毫米），夏季潮湿；因此，绿色基础设施对改善热舒适度的贡献可能有限。因此，本研究利用湿球地球温度 (WBGT) 指数和韩国气象站的数据，调查了绿色基础设施对热舒适度与降水量的影响。降水强度分为2天时段和10毫米/天。随后，根据车站周围的绿色基础设施比例，对1993年至2022年夏季的热舒适度进行了比较。结果表明，绿色基础设施对晴天有降温作用，但只有当绿色基础设施水平高于临界比时，才对降水日有降温作用。此外，如果降水后五天降温期间降水量极少，绿色基础设施会降低 WBGT 指数。虽然绿色基础设施对于适应气候变化仍然至关重要，但必须实施其他策略来改善热环境，特别是在降水频繁的地区。