基于空间PCA的兰州市热环境人文驱动因素分析

在城市化过程中,人类社会、经济活动的加剧使城市地表热力景观呈现出高度的空间异质性。目前对城市热环境形成、演变的驱动机制、热岛效应与地表覆被变化的定量关系研究大多还是从对某些影响因子的测定入手,缺乏对区域热环境系统全面、综合的评价与分析。利用多源空间数据,以干旱区河谷型城市兰州为研究对象,在探讨热环境的空间格局基础上,运用空间主成分分析方法替代传统的多准则判断方法,分析了人类活动对城市热环境的影响特征。结果表明:兰州市人类活动对热环境的影响因子可以归纳为4种相对独立的基本要素,即景观格局、工业布局、城市建筑以及地表覆盖。影响兰州市中心城区热环境的最核心要素是景观格局,四个因子的线性模型较好地模拟了热环境的空间变化,定量揭示了兰州中心城区人类活动对热环境的影响机制。

Simulation and analysis of human dimensions of urban thermal environment in valley-city:a case study of Lanzhou City

Urbanization is followed with a series of physical,ecological and social processes.The formation and evolution of urban thermal environment,which are closely related to changes of land cover and socioeconomic activities of human being in urban area,can generalize and embody urban ecological environment condition.Distribution and evolution of urban thermal environment is relevant to interactions of human activities such as the change of underlying surface,anthropogenic heat emission and environmental polluti...