基于SEBS模型的干旱区流域蒸散发估算探究

Abstract

Abstract: The ground water resources, including those utilized for crop growth in the irrigation system, gets into the atmosphere through evapotranspiration which is defined as the sum of plant transpiration and soil evaporation,forming a phase in water circulation as water goes from liquid to gaseous. Evapotranspiration is not only an important part in maintaining the water balance on the land surface, but also a major part to keep the surface energy balance. Water resource plays a much more important role in the economic and social development especially in arid area. Therefore, the quantitative estimation of regional evapotranspiration has some guiding significance for water resources allocation management and drought monitoring. In this study, the Surface Energy Balance System(SEBS) model based on moderate-resolution imaging spectroradiometer(MODIS) images is used to estimate the evapotranspiration in the Ebinur Lake basin, a typical ecological environment of arid basin, which is located in the west of Xinjiang, China. The evapotranspiration of the study area was estimated by using 45 scenes MODIS images from May 2015 to September 2015, and the scope of the study area was re-divided according to the watershed. Based on the land cover type, the study area is divided into six categories:arbor forest land, shrub land, pasture land, cultivated land, water area and the other area, the temporal and spatial changes of evapotranspiration in the watershed and the evapotranspiration of different land cover type were analyzed. The accuracy of the results was validated by eddy correlation(EC)system. The results show as follows:(1)The average daily evapotranspiration in the study area showed a single peak distribution in the vegetation growing season, with the peak reached in mid July, and an average of 4.35 mm·d^-1 and a maximum of 5.63 mm·d^-1, which was the most sensitive to the change of temperature.(2)According to the land cover type distribution and the whole basin evapotranspiration distribution, it is found that the distribution of evapotranspiration is highly consistent with the distribution of land cover types. The average daily evapotranspiration is in the following descending order:water area > cultivated land > pasture land > arbor forest land > other area > shrub land, with the corresponding values being:5.13 mm·d^-1, 4.51 mm·d^-1, 3.69 mm·d^-1, 3.56 mm·d^-1, 3.20 mm·d^-1 and 2.36 mm·d^-1 respectively.(3)According to the distribution of different land cover types, the peak distribution of the forest cover was 1.20 mm and 6.80 mm, the peak of shrub forest appeared at 3.5 mm and 6.00 mm, and the value of pasture appeared at 4.00 mm and 6.80 mm. The peak value of cultivated land and water is 6.60 mm and 7.20 mm respectively. (4)The SEBS model is suitable for the arid area.

Key words: surface energy balance system(SEBS), evapotranspiration, arid area, Ebinur Lake Basin

CLC Number:

P416.2

ZHANG Xiao-yu, FAN Ya-yun, MAIMAITIYIMING Reziwanguli, HE Xue-min, CHEN Li-hua, BAINDALA, QIQIKE, YANG Jian-jun. Evapotranspiration estimation of watershed in arid area based on SEBS model[J].干旱区地理, 2018, 41(3): 508-517.

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Evapotranspiration estimation of watershed in arid area based on SEBS model

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