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	Spatial distribution of reference evapotranspiration considering topography in the Taoer river basin of Northeast China
	Liang L. Q. ; Li L. J. ; Liu Q. A.
	2010
关键词	interpolate-then-calculate Penman-Monteith equation reference evapotranspiration spatial distribution Taoer river basin topographic influences reference crop evapotranspiration climate data annual precipitation estimation models semiarid climate pan evaporation penman-monteith water-use interpolation variability
英文摘要	Spatial distribution of reference evapotranspiration (ET(0)) is essential in water resources planning and management, especially in semi-arid areas. In this paper, a digital elevation model is used in an 'interpolate-then-calculate' approach to calculating the spatially distributed ET(0) using the physically based Penman-Monteith equation in the Taoer river basin in China. The results show the following. (1) Of 11 interpolation methods, the Inverse Distance Weighting (IDW) method was found to be best for interpolating wind speed and a tri-variate secondary trend surface method was found most suitable for interpolating mean air temperature and relative humidity. spatial modelling of the radiation environment considered the effects of elevation, slope and aspect. (2) Monthly values in January for the three meteorological variables showed larger spatial variations than in July, and just the reverse of net surface radiation. (3) The resulting ET(0) calculated at each grid cell with 200 m resolution and its spatial variation showed strong seasonal variation. Lower ET(0) was found in high-elevation southern Great Xingan mountains in the northwest basin, while higher values were located in the plains adjacent to the lower reach. (4) The ET(0) distribution by the 'interpolate-then-calculate' approach better reflected the effects of topography than that of the 'calculate-then-interpolate' approach.
出处	Hydrology Research
卷	41
期	5
页	424-437
收录类别	SCI
语种	英语
ISSN号	1998-9563
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23551]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Liang L. Q.,Li L. J.,Liu Q. A.. Spatial distribution of reference evapotranspiration considering topography in the Taoer river basin of Northeast China. 2010.

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