基于能量平衡的蒸散发遥感反演模型研究

提出了基于能量平衡方法遥感反演蒸散发的计算模型。采用经验、半经验公式反演计算了模型中各参数。利用提出的净辐射折算系数、波文比,结合Sequin和Itier理论推导了日蒸散发量计算的经验模型,并考虑了温度对瞬时蒸散发量的的影响,提高了全天蒸散发量计算的精度。对于不同地区只要调整净辐射折算系数便可解决由蒸散发瞬时值求算全天值的困难。通过对黑龙江省进行数值试验,证明该模型具有很强的实用性,并且可为旱情监测系统运行提供依据。

Remote sensing model for estimating evapotranspiration based on energy balance

The evapotranspiration estimation model is presented based on energy balance through remote sensing. The parameters of the model could be modeled using empirical and semi-empirical formulas; Based on net radiation convert coeffcient and Bowen ratio, combining theory of Sequin and Itier derive the daily evapotranspitation experience model of calculation; in respect that the temperature can influence the instantaneous evapotranspiration, which improve the estimation accuracy of the daily average evapotranspiration. As in different area, adjusting net radiation convert coefficient only can solve the daily evapotranspiration calculation problem from the instantaneous evapotranspiration value.Through a case study in Heilongjiang Province, it proves that this model has strong practicality and can offers scientific basis for the operation of drought monitoring system.