地理科学 ›› 2012, Vol. 32 ›› Issue (12): 1530-1537.doi: 10.13249/j.cnki.sgs.2012.012.1530

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河谷地形下兰州市城市热岛效应的时空演变研究

张建明(), 王鹏龙, 马宁, 张超   

  1. 兰州大学资源环境学院,甘肃 兰州 730000
  • 收稿日期:2011-09-06 修回日期:2012-06-13 出版日期:2012-12-20 发布日期:2012-12-20
  • 作者简介:

    作者简介:张建明(1964-),男,陕西勉县人,副教授,从事环境遥感与地学建模方面的教学与科研工作。E-mail:jmzhang@lzu.edu.cn.

  • 基金资助:
    国家基础科学人才培养基金(J1030519)资助

Spatial-temporal Evolution of Urban Heat Island Effect in Basin Valley —A Case Study of Lanzhou City

Jian-ming ZHANG(), Peng-long WANG, Ning MA, Chao ZHANG   

  1. College of Earth and Environmental Sciences , Lanzhou University, Lanzhou, Gansu 730000,China
  • Received:2011-09-06 Revised:2012-06-13 Online:2012-12-20 Published:2012-12-20

摘要:

基于1999年和2010年的Landsat ETM+和TM影像,以单窗算法反演了兰州市地表温度,研究兰州市最近10 a的城市热岛时空分布以及演变特征。研究结果表明:兰州市城市热岛的空间分布与延展与城市建城区的扩展相一致,热岛范围不断扩大,次中温和中温区大面积减少,相应的次高温和高温区大面积增加,热岛强度明显增强;除了城市下垫面覆盖类型,黄河低温带亦逐渐成为影响城市热岛分布的重要因子。各土地利用类型的平均温度均有所升高,建设用地和未利用地温度最高,对热岛效应贡献最大,是城市热岛的主要贡献因子,绿地和水体能够很好的缓解热岛效应。地表温度和信息指数NDVI、MNDWI、NDBI、NDBaI在兰州市河谷空间格局上显著相关,存在很好的对应关系。

关键词: 河谷盆地, 城市热岛, 时空演变, 兰州市

Abstract:

With the progress of urbanization, Urban Heat Island (UHI) has been becoming a key factor in deteriorating the urban ecological environment. Studying spatial-temporal evolution and its cause of typical area′s UHI and quantitatively evaluating effect from rapid urbanization on urban heat environment will provide theoretical foundation for relieving UHI effect and also have some useful reference value for ecological environment planning of urban planning. Based on LandsatETM+ and TM images of Lanzhou in 1999 and 2010, with the aid of GIS and RS, this article has retrieved the land surface temperature (LST) of Lanzhou City by Qin’s mono-window algorithm, and then analyzed spatial-temporal pattern and evolution characters of UHI in Lanzhou City in this decade, and the results show that: 1) The spatial pattern and stretch of UHI are consistent with distribution of built district in Lanzhou City. With the expansion of built district, UHI area constantly expanded and the area of less medium temperature and medium temperature had a large reduction, accordingly, the area of less high temperature and high temperature had a large increase, and consequently UHI intension obviously enhanced. Also, as building density of urban area has been increasing gradually, besides land use/covers type, low temperature belt caused by the Yellow River has been becoming a key factor in affecting the spatial pattern of UHI, and within a certain distance, it has the trend that LST tends to go down from the Yellow River to both sides. 2) From 1999 to 2010, average LST of each land use/cover type had a increase, and LST of different land use/cover type had obvious difference. LST of urban construction land and unused land was the highest, and they had the largest contribution to UHI effect, that is to say, they are the main contribution factor, on the contrary, green land and waterbody can reduce LST significantly, therefore, rational planning can effectively relieve the UHI effect. 3) This article has achieved 37 profiles from southeast to northwest of basin valley and calculated their land use index values (NDVI、MNDWI、NDBI and NDBaI) and LST, the results show that there existed significant correlation and corresponding relations between LST and the four land use indices.

Key words: basin valley, Urban Heat Island (UHI), spatial-temporal evolution, Lanzhou City

中图分类号: 

  • TP79