西北干旱区水面蒸发的遥感研究

Study on water surface evaporation within arid region of Northwest China with remote sensing

利用ASTER数据和Penman公式,以黑河流域中下游为研究区域,估算黑河流域的水面蒸发量。结果表明,利用ASTER数据估算的水面蒸发量和实际水面蒸发量之间的绝对误差在1.1 mm/d以内,相对误差绝对值的平均值为8%,可以达到实际应用的精度。利用ASTER数据估算的水面蒸发量具有明显的空间分布特征,对于研究西北干旱区水面蒸发量的空间分布特征具有一定的应用价值。

Based on the ASTER data and Penman formula, the water surface evaporation within Heihe River Basin is estimated by taking the mid-lower stream of the basin as the study area. The result shows that the absolute error between the water surface evaporation estimated with the Aster data and the actual evaporation therein is within 1. l mm/d and the average value of the absolute relative error is about 8% , which can reach the precision for the actual application. The evaporation estimated with the ASTER data has a feature of distinct spatial distribution and then has a certain applicable value for the study on the spatial distribu- tion feature of the water surface evaporation within the arid region of the Northwest China.