摘要
遥感技术为区域蒸散的定量提供了有效手段,在综述了国内外定量遥感蒸散研究概况的基础上,比较分析了目前较常用的几种遥感蒸散模型,并指出同类研究在地表温度与空气动力学温度差异、阻抗、平流、尺度效应及结果验证等方面存在一些问题,提出了提高定量遥感蒸散计算精度的具体措施,包括:运用高光谱提高地表温度反演精度;加强对瞬时地表蒸散转换为日总蒸散的研究;运用微波遥感解决阴雨天的地表蒸散;提高净辐射通量反演精度;借助动力学过程模型进行地表蒸散反演的研究;加强地面定标和试验遥感的研究等。
Remote sensing provides a valuable method for quantitative estimation of the regional evapotranspiration.After reviewing the progress of the RS methods for estimating ET,several frequently used models were compared and analyzed.Moreover,this study indicated some problems existing in many aspects,such as the difference between land surface temperature（LST） and aerodynamic temperature,the resistance,the current,the scale effect and the validation of the results.In order to solve these problems,several measures were suggested,including improving the precision of the calculated LST by applying the hyperspectrum,deepening the study of transforming the instantaneous surface evapotranspiration into daily evapotranspiration,using the microwave remote sensing to estimate the evapotranspiration in the rainy days,improving the precision of the net radiation flux calculation,enhancing studies in ground calibration and test remote sensing and so on. 更多
出处
《南水北调与水利科技》
CAS
CSCD
2011年第2期52-55,76,共5页
South-to-North Water Transfers and Water Science & Technology
基金
渭河水专项农业专题(2009ZX07212-002-003-002)
关键词
区域蒸散
定量遥感
遥感模型
regional evapotranspiratiom quantitative remote sensing~ remote sensing model
