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首页> 外文期刊>Journal of hydrologic engineering >Computation of Potential Evapotranspiration Using a Two-Source Method for the XirVanjiang Hydrological Model
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Computation of Potential Evapotranspiration Using a Two-Source Method for the XirVanjiang Hydrological Model

机译：XirVanjiang水文模型的两源法潜在蒸散量计算

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摘要

In this study, a physically based two-source potential evapotranspiration (PE) model was developed to calculate the spatio-temporal variation of PE over the Hanzhong watershed in China. The calculated PE was then integrated with the Xin'anjiang hydrological model to perform streamfiow simulation. A formula similar to the Penman-Monteith equation was used in the PE model to explicitly calculate the PE components of potential canopy transpiration, interception evaporation, and potential soil evaporation. Based on the 1 km global land cover data, the related vegetation parameters were derived from the Land Data Assimilation System. The monthly maximum composite of NOAA-AVHRR NDVI data with a 1 km resolution was used to retrieve the spatio-temporal variation of leaf area index. Meteorological data from the China Meteorological Administration were employed for calculations. A single grid cell test shows that land cover exercises a significant impact on the PE amount, its temporal variation, and associated components. The replacement of different vegetation types at the same grid cell may lead to different PE results. The spatial distribution of mean annual PE over the watershed is remarkably uneven, ranging from 268.6 to 970.2 mm. The simulated daily streamfiow by the Xin'anjiang model using the estimated PE matches well the observed daily streamfiow at the watershed outlet during the period of 1980-1986.
机译：在这项研究中，建立了基于物理的两源潜在蒸散（PE）模型，以计算中国汉中流域PE的时空变化。然后将计算出的PE与新安江水文模型集成在一起，进行水流模拟。 PE模型中使用类似于Penman-Monteith方程的公式来明确计算潜在冠层蒸腾，截留蒸发和潜在土壤蒸发的PE分量。基于1 km的全球土地覆盖数据，相关的植被参数来自土地数据同化系统。使用分辨率为1 km的NOAA-AVHRR NDVI数据的月最大复合值来检索叶面积指数的时空变化。计算使用了中国气象局的气象数据。单个网格单元测试表明，土地覆被对PE量，其时间变化和相关成分具有重大影响。同一网格单元上不同植被类型的替换可能导致不同的PE结果。流域年平均PE的空间分布明显不均匀，范围从268.6到970.2 mm。新安江模型使用估计的PE模拟的日流量，与流域出口在1980-1986年期间观测到的日流量非常吻合。

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