基于Landsat8数据的城市群热岛效应分析——长株潭城市群为例  

Urban Agglomeration Heat Island Analysis Based on Landsat 8 Data——A Case in Changsha-Zhuzhou-Xiangtan

作　　者：刘冰冰[1,2] 曾永年[1,2] LIU Bing-bing;ZENG Yong-nian(School for Geosciences and Info-physics/Central South University,Changsha 410093,China;Research Center for Geometics and Regional Sustainable Development/Central South University,Changsha 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410093 [2]中南大学空间信息技术与可持续发展研究中心,湖南长沙410083

出　　处：《山东农业大学学报（自然科学版）》2018年第4期591-597,共7页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：国家自然科学基金项目(41171326;40771198);中南大学中央高校基本科研业务费专项资金(2016zzts434)

摘　　要：本文利用Landsat8数据,采用普适性单通道法反演了长株潭城市群2013?2014年多季节的地表温度,运用多端元混合像元分解技术提取地表组分丰度信息,定量分析了土地覆盖类型对于城市群热岛效应的影响。研究发现:从初夏到夏末热岛效应先增强后减弱,在盛夏极高温区面积比率达到最高的3.0%,热岛效应程度最强且范围最广,而冬季热岛效应相对而言最不显著;在相同的气候条件下,植被的丰度与地表温度呈负相关,具有降温效应,不透水表面的丰度与地表温度呈正相关,导致城市增温;在不同季节,不透水表面丰度对地表温度贡献均为正,二者相关系数在0.87以上,这种贡献作用在盛夏季节最为强烈。城市化进程中不透水表面的面积与密度增长,是热岛效应产生的关键因素之一。Based on the Landsat8 data,the surface temperature of Changsha-Zhuzhou-Xiangtan urban agglomeration from 2013 to 2014 is retrieved by using single channel algorithm.The multiterminal mixed pixel decomposition technique is used to extract the abundance information of the surface components and quantitatively analyze the impact of land cover types on the heat island effect of the urban agglomeration.The results indicate the urban heat island(UHI)effect increased first and then weakened from the beginning to the end of summer,the area ratio reached the highest rate of 3.0%in the extremely high temperature region in the midsummer,the UHI effect was the most powerful and the most extensive,the UHI effect is the least significant in winter.Under the same climatic conditions,the abundance of vegetation is negatively correlated with the land surface temperature(LST)and has a cooling effect,the abundance of impervious surface is positively correlated with the land surface temperature(LST),which leads to urban warming.In different seasons,the contribution of impervious surface abundance to surface temperature is positive,and the correlation coefficient between them is more than 0.87,and extremely high in midsummer.The increase of the area and density of impervious surface in the process of urbanization is one of the key factors of UHI effects.

关 键 词：Landsat8 城市热岛效应 地表温度反演 混合像元分解 长株潭城市群 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]