Analysis of urban heat island effect and influencing factors based on the “source-sink” landscape pattern: a case study of Hefei
DI Jun-nan1, SU Tao1, LEI Bo2, LIU Xin-bei1, MENG Cheng1, XU Liang-quan1, WANG Ren-yi1
1. School of Spatial Informatics and Geomatics Engineering, Anhui University of Science and Technology, Huainan 232001, China; 2. China Institute of Water Resources and Hydropower, Beijing 100048, China
Abstract：Hefei, which has the highest urbanization growth rate among the three provinces and one city in the Yangtze River Delta, was selected as the research area. The "source sink" landscape of urban heat islands was identified by extracting surface temperature and sensitive remote sensing indices to surface features such as vegetation index, moisture index and impermeable surface index, and then the study was conducted combined with the urban heat island effect and the contribution of land use types to the "source" landscape. The results showed that the heating impact range of the "source" landscape in Hefei was 150m, and the "source-sink" landscape pattern could effectively alleviate the urban heat island effect. The degree of relief showed a strong to weak trend from southeast to northwest, with Lujiang county and Chaohu city having the best relief effect, while Shushan district and Yaohai district having the worst relief effect. The smaller the ratio of the "source sink" landscape area and the effective particle size scale of the "source" landscape, the standard shape index of the "source" landscape was between 0 and 0.35, and the more dispersed the landscape patches, the better the degree of relief of the heat island effect. For any land feature patch, the temperature rise caused by the heat island effect will weaken the inhibitory efficiency of the "source-sink" landscape pattern on the heat island effect. Increasing forest cover is one of the effective means to reduce regional warming and alleviate regional heat island.
邸俊楠, 苏涛, 雷波, 刘欣蓓, 孟成, 徐良泉, 王仁义. 基于“源-汇”景观格局的城市热岛效应及影响因素分析——以合肥市为例[J]. 中国环境科学, 2023, 43(11): 6039-6050.
DI Jun-nan, SU Tao, LEI Bo, LIU Xin-bei, MENG Cheng, XU Liang-quan, WANG Ren-yi. Analysis of urban heat island effect and influencing factors based on the “source-sink” landscape pattern: a case study of Hefei. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 6039-6050.
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