【摘要】 蒸散发是水分循环的重要环节,遥感技术为区域陆面水分蒸散发量估算提供了一种新的手段,使用TM数据和能量平衡模式估算流域蒸散发,并给出了各个参量的遥感获取方法,解决了由瞬时遥感数据估算全天蒸散发的问题。通过对关川河流域日蒸散发的模拟,分析了该流域蒸散发的分布规律,对陆面过程研究有一定的支持和指导意义。更多还原

【Abstract】 The method used in the study is based on surface energy balance equation,i.e.R_n=λET+H+G.By analyzing the spatial distribution of ET,we can draw that the spatial variation of ET is obvious.The estimated ET value ranges from 1.2 to 8.5 mm,with the average value of 4.7 mm on April 15,2000.Spatially,it increased from north to south.The highest value is occurred at the source of the river,where is woodland distributing.The results have been validated by field data,and the root mean square error(RMSE) is 0.8.The errors are less than 0.7mm in most of the stations except one.It proved that the method is feasible to estimate ET in the study area.The study enables us to better predict land surface hydrological cycle and lays a foundation for ecological restoration and application of distributed hydrologic model.更多还原