地球信息科学学报 ›› 2017, Vol. 19 ›› Issue (5): 713-722.doi: 10.3724/SP.J.1047.2017.00713

• 遥感科学与应用技术 • 上一篇    

基于LCZ的城市热岛强度研究

林中立(), 徐涵秋*()   

  1. 1. 福州大学 环境与资源学院,福州 350116;
    2. 福州大学 遥感信息工程研究所,福州 350116;
    3. 福建省水土流失遥感监测评估与灾害防治重点实验室,福州 350116
  • 收稿日期:2016-07-25 修回日期:2016-11-09 出版日期:2017-05-20 发布日期:2017-05-20
  • 通讯作者: 徐涵秋 E-mail:zhongli_lin@qq.com;hxu@fzu.edu.cn
  • 作者简介:

    作者简介:林中立(1989-),男,博士生,主要从事环境与资源遥感研究。E-mail:zhongli_lin@qq.com

  • 基金资助:
    国家自然科学基金项目(41501469)

A Study of Urban Heat Island Intensity Based on “Local Climate Zones”

LIN Zhongli(), XU Hanqiu*()   

  1. 1. College of Environment and Resources, Fuzhou University, Fuzhou 350116, China;
    2. Institute of Remote Sensing Information Engineering, Fuzhou University, Fuzhou 350116, China;
    3. Fujian Provincial Key Laboratory of Remote Sensing Soil Erosion and Disaster Protection, Fuzhou University, Fuzhou 350116, China
  • Received:2016-07-25 Revised:2016-11-09 Online:2017-05-20 Published:2017-05-20
  • Contact: XU Hanqiu E-mail:zhongli_lin@qq.com;hxu@fzu.edu.cn

摘要:

城市热岛强度是城市热岛研究和应用中的一个重要度量指标,但其科学计算一直是该研究的难点。目前常用的基于气象站的城乡温差计算法,由于在代表城区与郊区温度的选择上存在困难,较难准确客观地计算热岛强度。为此,本文在LCZ分类体系的基础上,结合卫星遥感影像数据,将其应用于福州市的城市热岛研究中,以科学地计算城市热岛强度。研究表明,采用分层分类和人工目视解译相结合的方法能较好地实现LCZ的遥感分类,并确定出分别代表城市和郊区的地表温度,据此计算得到2015年9月27日福州的城市热岛强度为6.73 ℃,热岛效应十分显著。进一步将分类结果与遥感地表温度影像叠加,可有效地区分各地类的热特性,全面反映城市热岛的分布状况。

关键词: 城市热岛强度, LCZ, 遥感, 福州市

Abstract:

In the context of city expansion and raise of awareness of climate change, urban planners are looking for methods and tools to take the urban heat island (UHI) into account. Urban heat island intensity (UHII) is an important metric used in measuring UHI effect. Nevertheless, its quantitative measurement has not yet been clearly addressed. Due to the limitation of meteorological stations either in number or location, the traditional method of calculating the temperature difference between urban and rural areas based on the meteorological station data fails to accurately describe the UHII of a city. In order to solve this problem, a classification schema “Local Climate Zones” (LCZ) was proposed by Steward and Oke. Nowadays, the satellite remote sensing imagery is widely used to reveal urban heat island phenomenon. Therefore, this paper applied the new framework of LCZ to the study of UHII in Fuzhou City, located in the center of the Fuzhou basin, southeast China, using remote sensing technology. Fuzhou City has witnessed a rapid urban expansion since the late 1970s. The fast expansion of the city has caused severe UHI phenomenon in the city. Thus, it has become the top one furnace city in China. This study reveals that LCZ based on remote sensing technology can effectively distinguish the thermal contrasts among all LCZ classes. Such contrasts are governed largely by height and spacing of buildings, pervious surface fraction, trees density and soil wetness. In addition, the LCZ can fully disclose the distribution patterns of UHI. In this study, we revealed a UHIILCZ of 6.73℃ for Fuzhou city on 27 September 2015, which indicates a significant UHI in the city.

Key words: urban heat island intensity, local climate zones, remote sensing, Fuzhou