By adopting the energy equilibrium theory,MODIS image data were applied to the inversion of the surface Evapotranspiration (ET) in Shiyang River basin,and the average daily ET in Shiyang River basin in January,April,July and October was estimated respectively. It is shown that ET in January is 0.15~7.21 mm; ET in April is 0.89~7.86 mm; ET in July is 0.12~9.08 mm and ET in October is 0.54~8.33 mm, mainly distributed in the Dajing Rriver,Gulang River,Huangyang River,Zamu River,Jinta River,Xiying River,Dongda River,Xida River and the water around Qilian Mountain area. The method of fractal image section line was used to describe the local and micro-structure characteristics of the remote sensing ET in the study area,thus the differences and trends of ET spatial distribution were understood(in January and July,the profile line of fractal number is larger,the profile curve undulates up and down,the ET gradient is bigger and distributed unevenly; in April and October,the profile line fractal number is less than that of January and July,the profile curve is quite gentle,and the ET level is smaller and distributed uniformly). The actual ET was calculated by using the FAO Penman-Monteith equation,and the indirect precision evaluation was made for the remote sensing ET. The results show that the estimated ET results are reasonable and have high precision.
刘春雨, 赵军, 刘英英, 魏伟. 石羊河流域蒸散发量遥感估算及时空格局分析[J]. 国土资源遥感, 2011, 23(3): 117-122.
LIU Chun-yu, ZHAO Jun, LIU Ying-ying, WEI Wei. Remote Sensing Estimation of Evapotranspiration Quantity and Analysis of Space-time Structure over Shiyang River Basin. REMOTE SENSING FOR LAND & RESOURCES, 2011, 23(3): 117-122.
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2011, Vol. 23 
