利用Landsat遥感影像进行福州市地表热通量估算的研究试验

Remote Sensing Study on the Surface Heat Flux in Fuzhou City

利用福州市1989年和2001年Landsat TM/ETM+遥感影像数据估算地表温度、地表反照率和植被覆盖度等地表参数,再结合气象站观测资料,估算与城市热岛密切相关的气候因子即显热通量和潜热通量。然后根据植被覆盖度对由人工建筑物和水泥道路等构成的不透水面覆盖区的潜热通量进行修正,改进了不透水面潜热通量的计算,并且探讨了地表热通量随土地覆盖变化的时空分布特征。最后对地表热通量精度进行分析和检验,论证了本研究的地表热通量估算结果是合理的。

The urban heat island effect has become one of the most serious city environmental problems. It causes the higher temperature in urban areas than in the surrounding rural areas, which changes the atmospheric environment and influences the people＇s life. Using satellite remote sensing （Landsat TM acquired in 1989 and ETM＋ images acquired in 2001）, we extract the land surface temperature,albedo and fractional vegetation cover. Then the sensible and latent heat fluxes which are climatic fac-tor related to the urban heat island can be estimated with local ground meteorological data. The latent flux of impervious surface covered with anthropogenic building or cement road is corrected by using fractional vegetation cover. It improves the method calculating the latent flux of impervious surface. And then this paper analyses spatial-temporal distributions of surface heat flu-xes with the land cover. In the end,by assessing and validating the accuracy of surface heat fluxes,we demonstrate that the esti- mated results of heat fluxes in our study are reasonable.