衡阳市热岛效应时空变化及其成因分析

【摘要】 热岛效应是城市生态环境的重要内容,其形成是多元素综合作用的结果,为定量揭示热岛效应的主要影响因素,以衡阳市为研究对象,利用2003—2017年6景Landsat TM/ETM+遥感影像数据,分析衡阳市热岛效应的时空变化特征,以及各影响因素对热岛效应的贡献率,揭示衡阳市城市热岛的变化特征及成因,对于衡阳市的城市规划、改善居民的居住条件具有重要意义。结果表明,衡阳市地表温度呈现出中间高四周低的空间分布格局。2003—2009年,衡阳市热岛范围向东、南、西、北4个方向扩展,高温区面积不断增加,2017年之后开始出现沿路网发展的线状高温,热岛强度减弱。衡阳市热岛效应的各影响因素间存在密切相关关系,其中城市化水平对热岛效应的贡献最大,地区生产总值次之。更多还原

【Abstract】 The heat island effect is an important part of the urban ecological environment,its formation is the result of multi-element interaction. In order to quantitatively reveal the main influencing factor of the heat island effect,Landsat TM/ETM+ remote sensing data from 2003 to 2017 of Hengyang city were used to analyze the spatiotemporal variation of the heat island effect and then to identify the contribution rate of each influencing factor to the heat island effect,that revealing the changing characteristics and causes of Hengyang’s urban heat island is of great significance for Hengyang’s urban planning and improving residents’ living conditions. The results showed the surface temperature of Hengyang city shows a spatial distribution pattern with middle high and four sides low. From2003 to 2009,the area of the heat island in Hengyang city expanded in four directions:east,south,west and north. The area of the high temperature area continued to increase. After 2017,linear high temperatures developed along the road network began to appear,and the heat island strength weakened. There is a close correlation among the various influencing factors,of which the urbanization level contributes the most to the heat island effect,and the regional GDP is second.更多还原