西安市热岛效应的反演研究

Inversion of Urban Heat Island Effect in Xi'an City

[目的]对西安市热岛效应进行反演。[方法]利用不同时相美国Landsat-7的ETM+和TM卫星数据,分析了不同时相西安市城市热岛效应的空间分布特征及变化趋势,并提出适合西安市的热岛效应防治措施。[结果]西安城市热岛现象十分明显,城区的地面温度明显高于周边郊区的温度,形成岛屿状的高温区域,界线清晰可辨。随着城市的扩建,西安市城市热岛效应范围也逐渐增大,主要表现为南北向的扩大。另外蓝田区的热岛效应越来越突出,应引起重视。建议通过提高城市绿化、合理规划城市建筑、减少人为热的排放量、预防和治理大气污染等措施,有效防治西安市热岛效应。[结论]该研究为西安市热岛效应的防治和生态环境的改善提供了理论依据。

[ Objective] We aimed to conduct the inversion of urban heat island effect in Xi＇an City. [ Method] Using the United States Landsat-7 ETM^＋ and TM data in different phases,we analyzed the spatial distribution and change trends of urban heat island effect of Xi＇ an, and put forward some corresponding measures to relieve the heat island effect in Xi＇ an according to its spatial distribution and intensity changes. [ Result] Urban heat island effect was very obvious in Xi＇ an City,that is,surface temperature of urban areas was distinctly higher than that ofsurrounding suburban areas, and the high-temperature region was akin to an island with a clear boundary. As the building of Xi＇ a City, the are- as being subjected to heat island effect expended toward the south and north especially. In addition, heat island effect of Lantian District became more prominent, so it should be paid more attention to. We suggested that some measures like improving urban vegetation coverage, reasonably planing urban buildings,reducing the discharge of artificial heat,preventing and controlling atmospheric pollution should be adopted to control urban heat island effect of Xi＇ an City effectively. [ Conclusion ] The study could offer theoretical references for the control of urban heat island effect and improvement of ecological environment in Xi＇ an City.