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本文以陇中黄土高原的祖厉河流域为研究区,基于Landsat系列遥感影像,利用主成分变换方法,与地面温度和植被指数相结合,进行土地利用/土地覆盖提取研究,在此基础上,探讨祖厉河流域土地利用/土地覆盖变化(LUCC)及其驱动因素。利用基于TM影像的SEBAL(Surface Energy Balance Algorithm for Land)模型,从祖厉河流域三期影像提取了区域蒸散发通量。首先进行了NDVI、比辐射率和地面温度等地表参数的计算,然后反演了地表的净辐射、土壤热通量和感热通量,根据能量守恒最终获得日蒸散发量。结合气象观测数据反演作物系数,最后计算月蒸散发量。对同期的土地利用/土地覆盖数据和陆面蒸散发量进行对比分析,探讨了土地利用类型的变化对流域内能量和水分时空分异的影响。
Based on the Landsat series of remote sensing images, the paper studied the extraction of land use and land cover by using the principle composition transformation method and the combination of ground temperature and vegetation index, based on the study of the Zuli River Basin in the Longzhong Loess Plateau. To explore the land use / land cover change (LUCC) and its driving factors in the Zuli river basin. Using the SEBAL (Surface Energy Balance Algorithm for Land) model based on TM images, the regional evapotranspiration flux is extracted from the third phase of the Zuli River Basin. Firstly, the surface parameters such as NDVI, emissivity and surface temperature were calculated. Then the net radiation, soil heat flux and sensible heat flux of the surface were retrieved. Finally, the daily evapotranspiration was obtained according to the conservation of energy. Combining meteorological observation data to retrieve crop coefficient, the final calculation of monthly evapotranspiration. The land use / land cover data and land surface evapotranspiration over the same period were compared and analyzed, and the effects of land use types on the spatial and temporal variations of energy and water in the basin were discussed.