Acta Geographica Sinica ›› 2020, Vol. 75 ›› Issue (11): 2443-2458.doi: 10.11821/dlxb202011013

• Ecological Civilization and Sustainable Development • Previous Articles     Next Articles

Thermal environment effects of urban human settlements and influencing factors based on multi-source data: A case study of Changsha city

XIONG Ying1,2,3(), ZHANG Fang1,2   

  1. 1. College of Architecture, Changsha University of Science and Technology, Changsha 410076, China
    2. Hunan Key Lab of Land & Resource Evaluation & Utilization, Changsha 410007, China
    3. Research Center of Resource Environment and Urban Planning, Changsha 410114, China
  • Received:2019-10-12 Revised:2020-07-13 Online:2020-11-25 Published:2021-01-25
  • Supported by:
    National Social Science Foundation of China(15BJY051);Open Topic of Hunan Key Laboratory of Land Resources Evaluation and Utilization(SYS-ZX-202002);Research Project of Appraisement Committee of Social Sciences Research Achievements of Hunan Province(XSP18ZDI031)

Abstract:

In view of the lack of comprehensive evaluation and analysis from the combination of natural and human multi-dimensional factors, the urban surface temperature patterns of Changsha in 2000, 2009 and 2016 are retrieved based on multi-source spatial data (Landsat 5, Landsat 8 satellite image data, POI spatial big data, digital elevation model, etc.), and 12 natural and human factors closely related to urban thermal environment are quickly obtained. The standard deviation ellipse method and spatial principal component analysis (PCA) method are used to analyze the effect of urban human residential thermal environment and the linkage of its influencing factors. The results show that: (1) During the 16 years from 2000 to 2016, the heat island area increased by 547 km2, and the maximum surface temperature difference reached 10.1 ℃. The spatial distribution of urban heat island was mainly concentrated in urban built-up areas, such as industrial and commercial areas and densely populated urban centers. The spatial distribution pattern of heat island is gradually decreasing from the urban center to the suburbs. There were many high-temperature centers, such as Wuyi square business circle, Xingsha economic and technological development zone in Changsha County, Wangcheng industrial zone, Yuelu industrial concentration zone, and Tianxin industrial zone. (2) From 2000 to 2016, the main axis of spatial development of heat island maintained in the northeast-southwest direction. From 2000 to 2009, the center of gravity of heat island shifted 2.7 km to the southwest, and the deflection angle was 54.9°; the center of gravity of heat island shifted to the northeast by 4.8 km, and the deflection angle was 60.9°. On the whole, the change of spatial pattern of thermal environment in Changsha was related to the change of urban construction intensity. (3) Through the principal component analysis method, it was concluded that the factors affecting the urban thermal environment pattern of Changsha were landscape pattern, urban construction intensity and landform. (4) The promotion effect of human factors on the formation of heat island effect was obviously greater than that of natural factors. Under the comprehensive effect, the temperature would rise by 0.293 units. There are many factors influencing the urban human settlements thermal environment. Multi-source data could help to reveal the spatial pattern and evolution law of urban thermal environment, deepen the understanding of the causes of urban heat island effect, and clarify the correlation and degree between human and natural factors, so as to provide scientific supports for the improvement of the quality of urban human settlements.

Key words: thermal environment, natural-human factor, multi-source data, spatial principal component analysis, Changsha city