Research on Urban Heat Island Effect in Chengdu Based on Landsat Images and Analysis of Influencing Factors

Abstract

The urban heat island effect exacerbates energy consumption and destroys ecology. Remote sensing technology has the advantages of a wide monitoring range and fast speed, which can realize the dynamic monitoring and analysis of the urban heat island effect. Therefore, this paper analyzed the heat island effect in Chengdu city from 2014 to 2024 based on Landsat8/9 satellite image data, and at the same time, explored the influencing factors of surface temperature based on Normalized Vegetation Index (NDVI) products, annual average precipitation data, and land use data. The results show that: the average summer temperature and average surface temperature in Chengdu city in the past 10 years generally show an increasing trend, which is consistent with the performance of the inversion results; the distribution range of the urban heat island is expanding, and the area of the heat island grows rapidly by about 40% from 2013-2018, and the growth of the area of the heat island decreases by about 25%, and the heat island area decreases by about 5% again in 2021-2023. area decreases again by about 5%. New heat island centers appear in Longquanyi District and Jintang County urban areas. Meanwhile, Longquan Mountain and other scenic areas can effectively mitigate the heat island effect. Urban development and construction should carry out rational functional area planning, and appropriately increase the area of urban water bodies and vegetation to weaken the intensity of the heat island effect.