SEBAL模型在台兰河流域蒸散发研究中的应用

SEBAL model for researching evapotranspiration in Tailan river basin

由于陆地表面的空间非均匀性,传统的观测手段难以由点向面拓展。采用基于地表热量平衡的SEBAL模型,利用MODIS影像数据估算了位于干旱地区的台兰河流域的实际蒸散发量及其时空分布特征。结果表明:日蒸散发量的实测值与反演值相关性为0.88,月蒸散发量的实测值与反演值相关性为0.91,精度较高。估算全年总的蒸散量约为7.04亿m3,比水量平衡法计算的蒸散量大4%。通过各精度的检验可知,该模型计算结果较为可信。

Due to the spatial non- uniformity of terrestrial surface,the traditional observation means is difficult to extend from point to plane. This paper used SEBAL mode1 witch is based on land surface heat balance and MODIS image data to estimate evapotranspiration and its temporal and spatial distribution characteristics in Tailan River basin located in arid region. The results indicated that the pertinence of daily evapotranspiration of actual observation and that of inversion value is 0. 88,and the pertinence monthly is 0. 91 that is higher precision. The estimated evapotranspiration in whole year is about 7. 04 × 108m3which is 4% greater than that computed by water balance method. According to test of every precision,the results computed by SEBAL model is credible.