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How to quantify the cooling effect of urban parks? Linking maximum and accumulation perspectives
Remote Sensing of Environment ( IF 13.5 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.rse.2020.112135
Jian Peng , Yuzhuo Dan , Ruilin Qiao , Yanxu Liu , Jianquan Dong , Jiansheng Wu

Abstract Urban parks can significantly alleviate the urban heat island, an ecological issue caused by urbanization. Clarifying urban park cooling effect can improve climate change adaptability and urban sustainability. However, park cooling effects were mainly explored in maximum perspective in previous studies, without considering the cumulative impact resulting from spatial continuity. Therefore, focusing on 24 urban parks in the main city zone of Shenzhen, China, such cumulative indexes as park cooling intensity and park cooling gradient, were proposed in this study and integrated with maximum indexes of park cooling area and park cooling efficiency, so as to explore park cooling effects comprehensively. The results showed that the park areas and cold spot areas of land surface temperature overlapped spatially by 64.40%. The partial correlation analysis showed that, park perimeter, area and shape index were significantly and positively correlated with park cooling area, with significantly negative correlation for park cooling efficiency. The vegetation index was significantly and positively correlated with park cooling intensity and park cooling gradient, and the impact of water body area ratio to all the four park cooling indexes was not significant. Then cooling effects of 24 urban parks were classified into four cooling capacity bundles, which showed that parks designed to serve different social functions behaved different cooling effects. The cooling effect of comprehensive parks was more efficient, with the same low value of all four cooling indexes for theme parks, high cooling intensity and cooling gradient for small ecological parks, and the highest cooling area for large ecological parks. This study proposed a comprehensive approach to measuring park cooling effects with both maximum and accumulation perspectives, which can guide urban park planning and design to maximize the ecological benefits.

中文翻译:

如何量化城市公园的降温效果?链接最大值和积累观点

摘要 城市公园可以显着缓解城市热岛这一城市化带来的生态问题。阐明城市公园降温效应可以提高气候变化适应性和城市可持续性。然而,以往的研究主要从最大角度探讨公园降温效应,没有考虑空间连续性带来的累积影响。因此,本研究以深圳主城区24个城市公园为重点,提出公园降温强度、公园降温梯度等累积指标,并结合公园降温面积和公园降温效率的最大指标,得出全面探索公园降温效果。结果表明,地表温度的公园区和冷点区空间重叠率为64.40%。偏相关分析表明,公园周长、面积和形状指数与公园降温面积显着正相关,与公园降温效率显着负相关。植被指数与公园降温强度和公园降温梯度呈显着正相关,水体面积比对4个公园降温指数的影响不显着。然后将24个城市公园的制冷效果分为四个制冷量束,表明服务不同社会功能的公园表现出不同的制冷效果。综合型公园降温效果更高效,主题公园四项降温指标均值较低,小型生态公园降温强度和降温梯度高,以及大型生态公园的最高降温区域。本研究提出了一种从最大化和累积角度衡量公园降温效果的综合方法,可以指导城市公园规划和设计以实现生态效益的最大化。
更新日期:2021-01-01
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