基于Landsat 8影像和能量平衡的西安市热场格局研究!

基于2014年8月15日的Landsat 8影像,通过劈窗算法反演西安中心城区地表温度,定量测算热岛中心范围。估算多种地表能量分量,分析热环境格局与地表能量分量的关系。结果表明:(1)西安中心城区城市热岛集中分布在人口、居住、商业密集区、经济技术开发区以及植被覆盖较差的区域;(2)感热、波文比与地表温度呈正相关,人为热与温度呈不显著正相关,净辐射、潜热与地表温度呈显著负相关;(3)城市热岛的地表能量结构中感热与潜热差异是构成城市热岛差异的主要原因。

Urban Heat Environment and Surface Energy Balance Analysis of Xi an based on LDCM Remote Sensing

Based on Landsat8 image on August 15,2014,this study estimated the land surface temperature(LST)of Xi an City by the method of split-window algorithm.Then quantitatively estimated the scope of urban heat island.Besides,Estimated a variety of surface energy component based on the surface energy balance equation.The results show that:① Urban heat island of Xian central areas mainly distributed in densely inhabited district,populated area and business-intensive areas,economic and technological development zones with less vegetation cover;② Thermal and bowen ratio was positively related to surface temperature,anthropogenic heat and temperature were not significantly correlated,net radiation and latent heat were significantly negatively correlated to the surface temperature;③In the structure of the surface energy of the urban heat island,differences in sensible heat and latent heat mainly caused the differences in the urban heat island.