Estimating Evaporation in Winter at a Field Irrigated Late in Autumn in Inner Mongolia, China

概要

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Shortage of water resources has been serious in the Yellow River basin. Therefore, it is expected to reduce the amount of irrigation water without reducing crop production. In the upper reaches, a large amount of water is irrigated late in autumn so that part of the irrigation water remain in a soil profile until next spring and is used for crop germination and development. We evaluated the overwinter water loss due to evaporation at a field irrigated late in autumn, which is a decisive factor for increasing irrigation efficiency. The aerodynamic method, with a dimensionless stability function deduced by Webb (1970), was used to measure the evaporation from a frozen soil surface. Daily evaporation was estimated to range from 0.09 mm to 0.92 mm, which summed up to about 60 mm for the period when the surface soil layer 10cm thick was frozen (23 November 2004-23 March 2005), which corresponds to about 25% of the amount of irrigation water (Kaneko et al., 2006).
九州大学の論文