生态环境学报Issue(2)：270-277,8.DOI:10.16258/j.cnki.1674-5906.2015.02.014
城市热环境季相变异及与非渗透地表的定量关系分析--以广州市中心区为例
Seasonal Variations of Urban Heat Environment and Its Relationship to Impervious Surface:A Case Study of Guangzhou Core Urban Area
摘要
Abstract
Pattern analysis of urban heat environment and modeling its driving factors are the two aspects in studies with the use of remote sensing images (e.g. Thermal band in Landsat TM). However, impacts of remote sensing images seasonal selection on urban heat environment analysis remain a challenge for researchers. We took Guangzhou city as a study area, and attempted to characterize the behaviors of urban thermal pattern and variations of relationship between LST and impervious surfaces over three thermal images from Landsat TM5 in 2005. We proposed an Object-oriented segmentation method to extract hot/cool islands and characterized their seasonal variations pattern with centroid method. Additionally, we modeled the LST-impervious surfaces relationship with regression tree. We found that:(1) From July 18 to November 23, hot islands tend to disappear from the urban core area and cool islands tend to disappear from the southern of Guangzhou. Centroid of hot islands shifts to eastern with 2.5km while centroid of cool islands shifts to north-western with 3.4 km form July 18 to October 22. And Centroid of cool islands shifts to north-western with 9 km while centroid of hot islands shifts to south-eastern with 8km form October 22 to November 23. (2) Pearson’s relationship between LST and impervious surfaces decrease from 0.994 1 in July 18 to 0.869 1 in November 23. Quadratic polynomial model shows better performances in November 23. (3) Compared to traditional linear regression, regression tree model is able to estimate more heterogeneity of LST. Results of regression tree indicates the impacts of impervious surface on LST is nonlinear and their distribution of equation are of spatial heterogeneity.关键词
非渗透地表/季相变异/热环境/广州市中心区Key words
impervious surfaces/seasonal variations/urban heat environment/Guangzhou Core Urban Area分类
资源环境引用本文复制引用
郭冠华,吴志峰,刘晓南..城市热环境季相变异及与非渗透地表的定量关系分析--以广州市中心区为例[J].生态环境学报,2015,(2):270-277,8.基金项目
国家自然科学基金项目（41171446；41201543）；广州市属高校“羊城学者”科研项目 （）
