Study on the cooling effect of urban parks base on the case of Changzhou, Jiangsu, China
WANG Xin-jun1,2, FENG Xing-ying1,3, CHEN Kai-li1,3, GAO Ji-xi4
1. School of Art and Design, Changzhou Institute of Technology, Changzhou, 213022, China; 2. Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing, 210042, China; 3. School of Art, Changzhou University, Changzhou 213016, China; 4. Ministry of Ecology and Environment Center for Satellite Application on Ecology and Environment, Beijing 100094, China
Abstract:This research selected parks in Changzhou, a rapidly urbanizing city in the Yangtze River Delta, to study the relationship between the composition of parks and their cooling effect. The park composition indicators and cooling effect indicators were extracted from high-spatial-resolution images created by Landsat 8TIRS and Tianditu. Land surface temperatures of the researched area were retrieved by the radiation transfer equation, and buffer analysis of ArcGIS, piecewise regression were used to analyze cooling effect indicators of each surveyed park, including the land surface temperature, the temperature drop range and the temperature drop amplitude. The perimeter, area and integration index of the parks were measured as their composition indicators. Afterwards, park land cover indicators, namely, the green coverage, water coverage, impervious surface coverage, and tree coverage were extracted from high-definition remote sensing images of Tianditu. Correlation analysis and the regression model between the park indicators and the cooling effect revealed that the temperature drop amplitude was nonlinearly related to the area and perimeter of a park, and the threshold were 26hm2 and 3600m respectively, which means that a park has a strong cooling effect with its area and perimeter within the threshold, while the cooling effect decreases with its area and perimeter exceeding the threshold. A second finding was that the integration index of a park had a linear correlation with the cooling rate, meaning greater cooling effect for parks with a lower integration index. The third finding was that the tree coverage and water coverage of a park were strongly correlated with the surface temperature inside the park, while the impervious surface coverage rate and green space coverage rate showed no significant correlation with the land surface temperature inside the park. Based on the three findings, it was concluded that to give full play to an urban park's cooling effect, planners and designers need give a thorough consideration of its area and perimeter thresholds, integration index value, and tree and water coverage.
王新军, 冯星莹, 陈凯莉, 高吉喜. 城市公园的冷岛效应研究——以常州市为例[J]. 中国环境科学, 2021, 41(9): 4245-4252.
WANG Xin-jun, FENG Xing-ying, CHEN Kai-li, GAO Ji-xi. Study on the cooling effect of urban parks base on the case of Changzhou, Jiangsu, China. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4245-4252.
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