摘要
随着城市化进程的加快,城市热岛现象日渐突出,给人类生产生活带来很大影响,成为当今社会的热点问题。本文根据2001年1月—2012年12月共416幅8天合成地表温度产品MOD11A2遥感影像,以UHIER指数为划分标准,采用密度分割法对地表温度进行等级分类,并运用相关分析、空间叠加分析和景观格局指数分析等方法,分析了青岛市城市热岛在日、季节及年际等时间尺度的变化规律和空间分布特征。结果表明:(1)在时间变化特征方面,城市热岛具有昼弱夜强的日变化特征;季节尺度上,表现为冬强夏弱,高温区所占面积比例分别为8.66%和5.07%;年际尺度上,热岛范围呈现出逐年增大的特点,高温区面积以每年15%的速率增加。(2)在空间特征方面,城市热岛主要集中在青岛市区、即墨市南部、胶州市中部以及黄岛区东部;对城市热岛的景观格局分析发现,青岛市地表温度向高温化、集中化趋势发展。
Background, aim, and scope Urban heat island （UHI） is one of the biggest ecological problems in the city at present, but most of the researches are carried out in the case of inland cities, fewer studies of UHI on coastal cities. This paper chooses Qingdao as the research case, using continuous and multi-temporal remote sensing data, systematically analyzes the daily, seasonal and interannual changes of UHI. In addition, by using the landscape pattern index, probed the spatial pattern of UHI of Qingdao city. Materials and methods In this paper, we according to 416 roll of MOD11A2 remote sensing image of 2001--2012 years, which is MODIS 8 days synthetic surface temperature product, taking UHIER index as the criteria and by using density segmentation method for the classification of land surface temperature, using the method of correlation analysis, spatial overlay analysis and landscape pattern index to analyze the spatial and temporal characteristics of UHI in Qingdao city. Results The results showed that： The UHI of Qingdao city at night is stronger than daytime, the proportion of higher temperature during the day is much lower than at night. The UHI is strongest in winter while weakest in summer, the proportion of higher temperature area in winter and summer is 8.66% and 5.07%, respectively. On the annual scale, the phenomenon of UHI showing an increasing trend year by year, the higher temperature area is increasing at the rate of 15% a year. In terms of spatial distribution, UHI mainly concentrate in urban district of Qingdao, south of Jimo, central of Jiaozhou and eastern of Huangdao. The analysis of the landscape pattern index shows that the land surface temperature of Qingdao is developing towards the trend of high temperature and concentration. Discussion From the results of the study, the temporal variation of UHI is significantly affected by the land-sea position of Qingdao city, showed greater differences with inland areas. In addition, the spatial distribution characteristics of the study area showed a certain degree of agreement with the topography distribution and land use status of the study area, and the mechanism of its formation needs more in-depth study. Conclusions Together with spatial and temporal distribution of the UHI of Qingdao city, we conclude that, in terms of time-varying features, Qingdao as a coastal city, its characteristic of UHI exhibits an opposite feature with inland cities in daily and seasonal characteristics, and showed consistency with other studies of UHI in coastal city. In addition, the landscape pattern index has a good directive significance for revealing the spatial pattern of UHI. Recommendations and perspectives The research conclusion both has theoretical significance for understanding the change characteristics and mechanism of UHI in coastal city, and can provide a certain decision basis and direction for the city planning and construction to a certain extent.
出处
《地球环境学报》
CSCD
2017年第2期157-168,共12页
Journal of Earth Environment
基金
山东省自然科学基金项目(ZR2015DL001)~~
关键词
城市热岛
时空特征
UHIER指数
景观格局
青岛市
urban heat island
spatial and temporal characteristics
UHIER index
landscape pattern Qingdao city
