Study on the Spatial-Temporal Evolution of Land Use and Its Thermal Environmental Effects in Chengdu

Abstract

: With the accelerating urbanization process, the urban land use structure has changed, and urban environmental and resource problems have become increasingly prominent. Among them, the urban heat island effect has seriously affected the sustainable development of society. Therefore, from the perspective of mitigating the urban heat island effect, this study uses two phases of remote sensing images of Chengdu in 2002 and 2019 as the main data. Using the methods of supervised land use classification and surface temperature inversion, the spatial and temporal changes and characteristics of land use and surface temperature in the central urban area of Chengdu are analyzed. The effects of different land use types on the surface temperature are also explored to investigate their thermal environmental effects. The main research results are as follows: (1) the area of construction land in the central urban area of Chengdu increased greatly from 2002-2019, and the proportion changed from 12.4% to 41.2%; the area of cultivated land and forest land decreased significantly. (2) The high-temperature area was mainly concentrated in the central region from 2002 to 2019, and the area was increasingly expanded; the low-temperature area shifted from the original northwest region to the eastern and southern regions. (3) Land use change was significantly correlated with the thermal environment. Surface temperature was negatively correlated with NDBI and positively correlated with NDBI.