遥感估算蒸散发量的日尺度扩展方法综述  

Review of methods on estimation of daily evapotranspiration from one time-of-day remotely sensed transient evapotranspiration

作　　者：刘素华[1,2] 田静[1] 米素娟[1,2] 

机构地区：[1]中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室,北京100101 [2]中国科学院大学,北京100049

出　　处：《国土资源遥感》2016年第4期10-17,共8页Remote Sensing for Land & Resources

基　　金：国家重点基础研究发展计划项目"土壤-植被水热参数多模式遥感协同反演与动态分析"(编号:2013CB33406);国家自然科学基金项目"无线传感器观测网络与遥感蒸散模型的双向互操作协同研究"(编号:41171286);国家自然科学基金项目"地物比辐射率测量方法与土壤比辐射率的变化规律研究"(编号:41271380)共同资助

摘　　要：遥感是获取大面积地表蒸散发量(evapotranspiration,ET)的主要手段,但是其所获得的ET是卫星过境时刻的瞬时值,而日尺度的ET才有实际意义和参考价值。目前,已有多种由瞬时ET经过时间尺度扩展成日尺度ET的方法,如恒定蒸发比法,时间积分法、正弦关系法、作物系数法和冠层阻力法等。为了对这些方法有一个清晰的了解和在应用时为方法选择提供依据,对以上5种常用方法的原理和特点进行了总结、对比和分析,并对当前该研究领域依然存在的难点问题和研究热点进行了总结。Remote sensing is a main method for obtaining large -scale land surface evaportransporation （ET）, and the direct result of ET is an instantaneous value estimated at the passing time of satellite. Therefore only the daily evapotranspiration has practical significance. Recently, many ET time scale extrapolation methods have been proposed, such as constant evaporative fraction method, time integration method, sinusoid method, crop coefficient method and canopy resistance method. In order to provide readers with clear outlines about the methods and tell readers what is the proper justification when these methods are used, this paper attempted to summarize and make a comparison of the above 5 common methods based on their principles and characteristics. The results obtained show that each method has its own advantages and disadvantages, and hence researchers should consider features of the study area and the data to assure the best selection. What＇ s more, there is a summarization about the existing difficulties and the research hotspots.

关 键 词：遥感 蒸散发量(ET) 尺度扩展 蒸发比法 时间积分法 正弦关系法 作物系数法 冠层阻力法 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置]