基于辐射传输模型的绵阳市城市热岛效应时序演变分析

Time Series Evolution Analysis of Urban Heat Island Effect in Mianyang City Based on Radiation Transmission Model

【目的】探究2017—2021年绵阳市地表温度变化及发展趋势。【方法】以绵阳市为例,利用2017年、2019年、2021年landsat8遥感数据,采用大气辐射传输模型反演绵阳市地表温度。【结果】(1)绵阳市城市热岛效应特征明显,各等级主要呈聚集状,以强热岛和强绿岛分布最为明显。(2)2017—2021年,地表温度呈上升趋势,强热岛区、热岛区主要分布在城中心地区,并沿河流扩张;绿岛区主要分布在安州西北、北部高山丛林及涪江、安昌河、仙海湖等区域。(3)2017—2021年,由中间区、热岛、强热岛区重心迁移可知,绵阳市城市沿涪江和安昌河往东南和西北方向迅速发展。【结论】研究结果能够为绵阳市城市建设发展和生态规划提供参考依据。

[Purposes] This paper aims to explore the changes and development trend of surface temperature in Mianyang City from 2017 to 2021.[Methods] Taking Mianyang City as an example,the surface temperature of Mianyang City was inverted by using the 2017,2019 and 2021 LandsSAT8 remote sensing data.[Findings] The results show that:(1) The characteristics of urban heat island effect in Mianyang City are obvious,and each grade is mainly clustered,with the most obvious distribution of strong heat island and strong green island.(2) From 2017 to 2021,the surface temperature showed an upward trend,and the strong heat island area and heat island area were mainly distributed in the central area of the city,and expanded along the river;Green Island District is mainly distributed in the northwest of Anzhou,the northern alpine jungle,Fujiang River,Anchang River,Xianhai Lake and other areas.(3)From 2017 to2021,from the migration of gravity center of the middle district,heat island and strong heat island area,it was found that the city of Mianyang City developed rapidly along the Fujiang River and the Anchang River to the southeast and northwest.[Conclusions] The research results can provide a reference for urban construction development and ecological planning in Mianyang City.