地理科学 ›› 2019, Vol. 39 ›› Issue (6): 1016-1024.doi: 10.13249/j.cnki.sgs.2019.06.017

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近20年京津唐主体城区地表热场空间特征变化分析

于琛,胡德勇(),张旸,曹诗颂,段欣,张亚妮   

  1. 资源环境与地理信息系统北京市重点实验室,北京 100048
  • 收稿日期:2018-08-22 修回日期:2018-12-31 出版日期:2019-06-10 发布日期:2019-06-10
  • 通讯作者: 胡德勇 E-mail:deyonghu@cnu.edu.cn
  • 作者简介:于琛(1993-),男,四川成都人,博士研究生,主要从事资源环境遥感方面研究。E-mail: yuchencg13@163.com
  • 基金资助:
    国家自然科学基金项目(41671339);国家重点研发计划课题资助(2017YFB0504102)

Spatial Characteristics and Changes of Surface Thermal Field in Beijing-Tianjin-Tangshan Region in the Last Two Decades

Chen Yu,Deyong Hu(),Yang Zhang,Shisong Cao,Xin Duan,Yani Zhang   

  1. Beijing Key Laboratory of Resource Environment and GIS, Beijing 100048, China
  • Received:2018-08-22 Revised:2018-12-31 Online:2019-06-10 Published:2019-06-10
  • Contact: Deyong Hu E-mail:deyonghu@cnu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(41671339);National Key Research and Development Program of China(2017YFB0504102)

摘要:

基于Landsat遥感影像获取京津唐主体城区1995~2015年地表温度(Land Surface Temperature, LST)和不透水地表盖度(Impervious Surface Percentage, ISP)数据。采用热点聚集和阈值分割法,依据地表的温度和不透水盖度属性将京津唐主体城区划分成9种地表热场类型,分析并探讨地表热场的发展规律、年际变化状况和区域贡献作用。研究发现,京津唐主体城区地表温度与不透水地表盖度间存在显著的正向相关关系,两者分别呈现“阶梯降”和“两端高、中间低”的变化特征。京津唐主体城区地表热场的发展主轴保持在西北-东南方向,且随时间推移沿主轴呈聚集态势。 京津唐主体城区地表热场的影响范围在空间上持续扩张,对于不同的主体城区,其在整体区域的热场贡献中有差异化表现。

关键词: 地表热场, 地表温度, 不透水地表盖度, 京津唐

Abstract:

The changes in the characteristics of urban land surface thermal field caused by urban development have significant impacts on regional climate and ecological environment. Urban land surface thermal field reflects the relationship between urban expansion and environmental temperature. Understanding the formation causes and coupling association of urban land surface thermal field and urban development has important academic research significance. Conducting long-term surface monitoring and measurement in Beijing-Tianjin-Tangshan region, studying the characteristics of the land surface thermal field and its variation by the perspective of regionalization. Land surface temperature (LST) and impervious surface percentage (ISP) in the main urban area of Beijing-Tianjin-Tangshan in 1995, 2005, and 2015 were obtained by Landsat remote sensing images. The methods of ten fold cross validation and record value verification were used to evaluate results of ISP and LST. Based on the hot spot aggregation method, study area was zoned for low, medium, and high LST zones. In the same way, study area was zoned to natural land surface, low, and high ISP zones based on threshold segmentation method. And the land surface thermal field in the main urban area of Beijing-Tianjin-Tangshan was divided into nine types according to the regionalization information about LST and ISP. Then the development law, the inter-annual change situation, and the regional contribution of different types of land surface thermal field were analyzed and discussed based on the method of mathematical statistics, standard deviation ellipse, and contribution index. The study find that the LST has a significant correlation with the ISP in main urban area of Beijing-Tianjin-Tangshan, the multiple correlation coefficients are 0.88, 0.92, and 0.94 from 1995 to 2015, this also reflects that the relationship between the two land surface attributes is gradually strengthening. The LST would rise with the increase of ISP. This growth phenomenon performs fast in 1995 and is slow in 2005 and 2015 relative. The mean value of ISP is 49.72%, 53.87%, and 57.17% in three periods, and high LST zone area also maintains 1.5 time growth rates over time. The development focal axis of land surface thermal field remains in the northwest-southeast direction and accumulates along the axis over time. The centroid of land surface thermal field in the main urban area of Beijing-Tianjin-Tangshan is concentrated in the central part of each city. The inter-annual change rate of land surface thermal field increases from 12.00% to 13.71%, the type of land surface thermal field continues to change to the form of “high LST and high ISP”. Besides, the land surface thermal field shows the change characteristics of “step down” in LST and “large at both ends and small in the middle” in ISP. The land surface thermal field of the main urban area of Beijing-Tianjin-Tangshan continues to expand in space. The spatial distribution of the land surface thermal field in Beijing’s main urban area gradually spreads from the south to the entire area. Tianjin’s land surface thermal field spreads rapidly from the central area to the port. Tangshan’s spatial distribution of land surface thermal field is more significant in the north. Different main urban areas have different contributions to the overall area: Beijing's contribution is concentrated in areas of high-grade land surface thermal fields. Tianjin's contribution to various types of land surface thermal field is balanced. And Tangshan's contribution is inclined to shift to higher grade land surface thermal fields. The study is applicable to assessing spatial and temporal changes in the thermal field in the Beijing-Tianjin-Tangshan region, and promoting the coordinated development of construction planning and ecological environment in the urban community area.

Key words: land surface thermal field, land surface temperature, impervious surface percentage, Beijing-Tianjin-Tangshan

中图分类号: 

  • TP79