A study on the strategies of Park City construction of Chengdu from the perspective of urban heat island mitigation

Lichen Wang, K. Gu, D. Dong
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Abstract

In the process of urbanization, various urban problems have become increasingly prominent, and the heat island effect is one of them. The expansion of urban land, the increase in construction intensity and the increase in population make the urban heat island effect even worse. The construction of park cities improves the ecological environment of the city and is considered to have a positive effect on alleviating the heat island effect, but it is not clear whether it has such an effect or not. This article explores whether the construction of Park City can help to improve the urban thermal environment effectively, and also, seek solutions for how to improve the construction of park cities so that the heat island effect can be better mitigated. Landsat8 remote sensing images in 2014 and 2019 were used to estimate the fractional vegetation cover (FVC) and land surface temperature (LST) in the Third Ring Road of Chengdu. Land use data were also introduced into the study to analyze LST changes in different surfaces and FVC.The results indicate that: (1) the area of the heat island zone in the Third Ring Road of Chengdu decreased by 0.91% from 2014 to 2019, and the area of the cold island zone increased by 17.89% ; (2) the urban blue-green space is conductive to mitigating the urban heat island effect, in which the water provides the best mitigation, while impervious surface and bare land may aggravate the urban heat island effect; (3) the FVC in the area of the Third Ring Road in Chengdu is on the rise as a whole, and there is a significant negative correlation between FVC and LST (p < 0.01). Based on the above results, this paper shows that Park City construction is beneficial to alleviate the urban heat island effect, and more attention should be paid to blue-green space layout and quality, along with urban ventilation and FVC control. Our results provide useful input for green space planning and the construction of Park City in the future.
城市热岛缓解视角下成都市公园城市建设策略研究
在城市化进程中,各种城市问题日益突出,热岛效应就是其中之一。城市用地的扩大、建设强度的增加和人口的增加使城市热岛效应更加严重。公园城市的建设改善了城市的生态环境,被认为对缓解热岛效应有积极的作用,但是否有这样的作用尚不清楚。本文探讨了公园城市的建设是否能够有效改善城市热环境,并寻求如何改进公园城市的建设以更好地缓解热岛效应的解决方案。利用2014年和2019年Landsat8遥感影像对成都市三环路植被覆盖度(FVC)和地表温度(LST)进行估算。同时引入土地利用数据,分析不同地表温度和植被覆盖度的变化。结果表明:(1)2014 - 2019年,成都市三环热岛区面积减少0.91%,冷岛区面积增加17.89%;(2)城市蓝绿空间有利于缓解城市热岛效应,其中水体的缓解效果最好,而不透水地表和裸地可能加剧城市热岛效应;(3)成都三环地区植被覆盖度总体呈上升趋势,植被覆盖度与地表温度呈显著负相关(p < 0.01)。基于上述结果,本文认为公园城市建设有利于缓解城市热岛效应,应重视城市蓝绿空间的布局和质量,同时应重视城市通风和植被覆盖度的控制。我们的研究结果为未来公园城市的绿地规划和建设提供了有益的参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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