Area-averaged Evapotranspiration Fluzes Measured from Large Aperture Scintillometer in the Hai River Basin
Compared with traditional observation techniques, Large Aperture Scintillometer (LAS) can measure area-averaged evapotranspiration (ET) at a larger scale (500m-10Km), for area-averaged evapotranspiration and water resources management, LAS has become more and more popular in recent years. Through the improvement of data processing scheme of LAS, the area-averaged ET was calculated from observation data collected from Miyun and Guantao site in Hai Basin from Jan to July,2008. The results show the ET in different surface has obvious diurnal and seasonal variations. At the same time, the comparison between ET and net radiation, precipitation as well as the height of ground vegetation was analyzed, the results showed ET was affected by the three factors. The total amount of ET from Jan to July is 260mm and 293mm in Miyun and Guantao site respectively. In the end, from the discussion of the difference between sensible heat flux measured from LAS and Eddy Covariance System(EC), it can be concluded the difference between Hlas and Hec were caused by the landuse of the surface, the overlap degree of the LAS and EC footprint, as well as energy closure ratio of EC together.
Large Aperture Seintillometer(LAS) area-averaged evapotranspiration (ET) footprint
BAI Jie LIU Shaomin MAO Defa
State key laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beij Beijing Water Technology Centre, Beijing, 100073, China
国际会议
北京
英文
331-340
2008-12-08（万方平台首次上网日期，不代表论文的发表时间）