Current situation analysis and spatial-temporal changes of urban heat island effect in Nanchang City
The paper took Nanchang City as the research object,used Landsat series remote sensing data,and combined atmospheric correction method to invert surface temperature,construct temperature prediction GM model and other methods,obtain the spatial and temporal variation characteristics of urban heat island effect in Nanchang City,and simulate and predict future temperature changes.The results showed that:(1)From 2005 to 2021,the highest surface temperature in Nanchang increased by 25.36℃,and the lowest temperature increased by 11.59℃.(2)The heat island effect in Nanchang was mainly concentrated in the central urban area with population aggregation and rapid development,and the surface temperature showed a trend of decreasing from the urban built-up area to the surrounding area.(3)After 2021,the annual average temperature of Nanchang will continue to rise,and the problem of urban heat island effect will become more and more serious.(4)By analyzing the relationship between the type of underlying surface and the spatial distribution of land surface temperature,it was concluded that water and vegetation are negatively correlated with urban land surface temperature,which can improve the heat island effect to a certain extent.The basic data and theoretical basis of the spatial and temporal changes of urban heat island effect in Nanchang City proposed in this study provide a feasible method for slowing down the urban heat island effect.
urban heat island effectNanchang Cityremote sensing imagegrey modeltemperature forecast
NETL
NSTL
万方数据
