不同蒸散发模型在湿润地区的适用性研究

Applicability of different evapotranspiration models in moist area

为研究不同蒸散发模型在估算湿润地区蒸散发量方面的适用性,以淮河大坡岭以上流域为研究对象,构建了考虑植被叶面积指数的分布式彭曼蒸散发模型及双源蒸散发模型。通过计算流域2010~2018年逐日蒸散发能力,并建立上述模型计算值与蒸发皿实测值的拟合关系,比较了两个模型的计算精度。结果表明:彭曼蒸散发模型及双源蒸散发模型计算的流域蒸散发能力值与蒸发皿实测值,在时间上具有较好的相似性和一致性;且双源蒸散发模型计算的流域蒸散发能力与蒸发皿实测蒸散发值的相关关系好于彭曼蒸散发模型。研究结果可为估算湿润地区的蒸散发量提供支撑。

In order to compare the applicability of different evapotranspiration models in estimating moist area evapotranspiration,we taking the basin above Dapoling in Huaihe River as research object.Distributed Penman-Monteith evapotranspiration model and dual-source evapotranspiration model which could reflect the dynamic evolution process were built.The daily potential evapotranspiration of 2010~2018 was calculated by the evapotranspiration models and compared with the pan evaporation.The results indicated that good temporal similarity and consistence occurred between the potential evapotranspiration calculated by the above two models and the measured values.The correlation between dual-source evapotranspiration model and evaporation pan was better than the Penman-Monteith evapotranspiration model.The results could provide support for the estimation of moist area evapotranspiration.