太原市建成区热岛效应及其影响因子研究

Heat Island Effect and Its Influencing Factors of Built-up Area in Taiyuan City

太原市作为重工业城市,工业区建设和城市扩张对城市温度影响很大。本章基于太原市2008—2016年4期遥感影像进行温度反演,并通过均值标准差法进行温度等级的划分,分析太原市建成区热岛分布范围和占比情况。计算NDVI(归一化植被指数)、NDWI(归一化水体指数)、BSI(裸土指数),并分析这3个指数与反演温度LST之间的相关性,研究下垫面对城市热环境的影响。结果表明,建成区热岛范围主要集中在城市中心,城市周边温度明显要低;NDVI、NDWI与LST间存在负相关关系,BSI与LST间存在正相关关系,说明植被和水体具有显著的降温增湿作用,不透水下垫面和裸土区域是形成热岛的主要因素。

As a heavy industrial city,the construction of industrial areas and the expansion of cities have a great influence on the temperature of Taiyuan city. The distribution and proportion of built-up area were analyzed based on the temperature inversion of the fourth phase of remote sensing image from 2008 to 2016 in Taiyuan City,and the temperature levels were graded by the mean standard deviation method.This paper calculated the NDVI（ Normalized Vegetation Index）,the NDWI（ Normalized Water Index）,and the BSI（ Bare Soil Index）,analyzed the correlation with the land surface temperature（ LST） inversion,and studied the influence of underlying surface on urban thermal environment. The results showed that the heat island effect of built-up area concentrated in urban center,and the surrounding temperature was obviously lower. The NDVI and the NDWI were negative correlation with the LST,and the BSI was positive correlation with the LST,which indicated that vegetation and water had the significant cooling and humidifying effect,and the impermeable underlying surface and the bare soil area were the main factors of heat island.