基于CRAE模型的西北地区实际蒸散发量计算

Calculation of Actual Evapotranspiration Based on Morton CRAE in Northwest China

应用我国西北地区常规气象资料对Morton互补相关(CRAE)模型进行了必要的校正,以适应其在西北地区的应用。结果表明,净长波辐射公式是影响模型计算精度的主要因素,且在校正中必须考虑高程的影响。校正后的模型可利用我国常规气象观测资料进行实际蒸散发量的计算,其精度可满足实际应用的要求,模型计算结果反映了西北地区水分蒸发的主要控制因素,具有一定的实际应用价值。

In this paper,Morton Complementary Relationship Areal Evapotranspiration（CRAE） model was calibrated and validated essentially using conventional meteorological data to suit their application in Northwest China.The results showed that the impact of net long-wave radiation formula and elevation are major factor affecting the accuracy of the model and must be taken into account in the primary model calculation.The calibrated model can be applied to calculate the actual evapotranspiration using conventional meteorological data,and can be used in soil moisture analysis and irrigation and drainage research in arid and semiarid areas of Northwest China.The accuracy can meet the computing requirements.The results reflect the main control factor of water evaporation in Northwest China,and the model has the value of the practical application.