Exploring the variation trends of urban heat island (UHI) effects is critically important for sustainable urban development.UHI characteristics of Sanhe City, Hebei Province were investigated, using Landsat 8 satellite imagery. Land surface temperature (LST) was retrieved via the single-window algorithm, and visual interpretation and overlay analysis were employed to examine the relationship between urban green spaces and LST. The results show that from 2014 to 2020, the UHI effect in Sanhe undergoes significant changes, with high-temperature zones mainly distributed in residential and university areas. The normalized difference vegetation index (NDVI) is found to be negatively correlated with LST, and stronger cooling effects are observed in areas with higher NDVI values. Although green space area also shows a negative correlation with LST, the relationship is non-linear. The correlation between green space perimeter and LST is weak and becomes noticeable only when the number of samples is sufficiently large. Overall, green spaces have a cooling effect on surrounding areas; however, the extent of this effect is influenced by multiple factors. There is only a weak correlation between green space area and cooling range, indicating that simply increasing green space area does not directly expand the extent of temperature reduction. These findings provide scientific insights for urban green space planning and heat environment mitigation.
WANG Zi-han, WEN Shao-yan, DENG Miao, SHAN Xin-jian.
Urban Heat Island Change and Green Space Impact Based on Remote Sensing Imagery: Sanhe City[J].
Science Technology and Engineering, 2026, 26(3): 914-925 DOI:10.12404/j.issn.1671-1815.2501216
随着城市化进程的加快,城市热岛效应(urban heat island, UHI)已成为制约城市生态环境质量和居民健康的重要因素之一[1]。尤其是在中国中东部地区,快速扩张的城市空间、密集的建筑群以及绿地比例的下降,导致地表热环境持续恶化,引发了一系列如高温热浪、能源负荷增加和空气质量下降等问题[2-11]。如何科学识别和有效缓解城市热岛效应,已成为城市规划和可持续发展的核心议题。
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