沈阳市城市热岛效应研究

Urban Heat Island Effect in Shenyang

本文采用两幅不同时期的TM(ETM+)影像,将不同年份反映的地表温度结果进行归一化处理,通过提取归一化植被指数(NDVI),得出热岛效应的动态变化特征,结果表明:该区域2002年与1992的温度分布存在显著差异;绿地覆盖率需达到一定的比例时,地面温度与植被指数(NDVI)之间存在负相关关系。此研究为城市的后续发展提供参考同时也方便于决策部门对热岛效应的缓解提出治理的机理与对策。

This paper uses two TM （ETM ＋） images in different periods, nornlalizes the surface temperature results that reflected different years, and gets the dynamic characteristics of heat island effect by extracting the normalized difference vegetation index （NDVI）. The results showed that： the temperature distribution of this area in 2002 and 1992 has significant differences; there is a negative correlation between surface temperature and vegetation index （NDVI）, which requires that the green coverage rate achieves a certain percentage. This study provides a reference for the subsequent development of the city and contributes to the decision-making departments propose governance mechanism and countermeasures for improving heat island effect.