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西安市不透水面的变化及其驱动力
周鹏, 谢元礼, 高志远, 蒋广鑫
西北大学 城市与环境学院, 陕西 西安 710127
摘要:
[目的] 分析并监测城市不透水面动态变化,为城市化和环境质量评价提供依据。[方法] 以陕西省西安市为研究区,选取Landsat系列1995,2000,2006,2010,2016年5期遥感影像,利用光谱混合分解法对西安市不透水面进行提取,进而分析西安市21 a间不透水面的时空变化,并对影响不透水面变化的驱动力进行分析。[结果] ①西安市不透水面面积所占比例不断攀升,其中2000年至2006年年均增长最慢,2010年至2016年年均增长最快,主城区增长最快时期为2006年至2010年。②空间变化上,2006年以前,不透水面主要呈同心圆的模式,以主城区为核心向外辐射扩张。2006年以后,各区县城和主城区的不透水面均大幅向外扩张,呈现一主多次模式。③人口规模、经济发展、产业结构、规划政策与西安市不透水面的增加息息相关。[结论] 西安市不透水面扩张的时空变化基本反映了规划要求,未来应加强城市副中心建设,大力保护生态环境,处理好城市化和不透水面扩张的关系。
关键词:  遥感  不透水面  光谱混合分解法  驱动力  西安市
DOI:10.13961/j.cnki.stbctb.2020.03.040
分类号:TP79;X821
基金项目:陕西省自然科学基础研究计划“关中城市雾霾天气溶胶变化遥感监测与分析”(2017JM4035)
Changes and Driving Forces of Impervious Surfaces in Xi'an City
Zhou Peng, Xie Yuanli, Gao Zhiyuan, Jiang Guangxin
College of Urban and Environment Science, Northwestern University, Xi'an, Shaanxi 710127, China
Abstract:
[Objective] The dynamic changes of impervious surfaces were analyzed and monitored to provide a basis for urbanization and environmental quality evaluation.[Methods] Xi'an City was taken as the study area, and remote-sensing imagery of Landsat series in 1995, 2000, 2006, 2010, and 2016 were used to extract impervious surfaces by means of a linear spectral mixture analysis method. Subsequently, spatial-temporal changes of impervious surfaces during 1995-2016 and the driving forces were analyzed.[Results] ① The proportion of impervious surfaces in Xi'an City increased, with the average annual growth rate being the minimum from 2000 to 2006 and the maximum from 2010 to 2016. The maximum growth period in the main urban area was from 2006 to 2010. ② In terms of spatial changes, before 2006, the impervious surface was in a concentric pattern, with the main urban area as the core that radiated outward. After 2006, the impermeable surface of each district and county and the main urban area expanded greatly outward, showing one main center and multiple subcenter modes. ③ Population size, economic development, industrial structure, and planning policies were closely related to the increase of the impervious surfaces of Xi'an City.[Conclusion] The spatial-temporal changes of the impervious-surface expansion in Xi'an City basically reflected the planning requirements. In the future, the construction of a subcentral city should be strengthened, the ecological environment should be vigorously protected, and the relationship between urbanization and impervious-surface expansion should be handled properly.
Key words:  remote sensing  impervious surface  spectral mixing analysis method  driving forces  Xi'an City