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首页> 外文期刊>Journal of the American Water Resources Association >A COMPARISON OF SIX POTENTIAL EVAPOTRANSPIRATION METHODS FOR REGIONAL USE IN THE SOUTHEASTERN UNITED STATES
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A COMPARISON OF SIX POTENTIAL EVAPOTRANSPIRATION METHODS FOR REGIONAL USE IN THE SOUTHEASTERN UNITED STATES

机译：美国东南部地区六种潜在蒸发蒸腾方法的比较

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Potential evapotranspiration (PET) is an important index of hydrologic budgets at different spatial scales and is a critical variable for understanding regional biological processes. It is often an important variable in estimating actual evapotranspiration (AET) in rainfall-runoff and ecosystem modeling. However, PET is defined in different ways in the literature and quantitative estimation of PET with existing mathematical formulas produces inconsistent results. The objectives of this study are to contrast six commonly used PET methods and quantify the long term annual PET across a physiographic gradient of 36 forested watersheds in the southeastern United States. Three temperature based (Thornthwaite, Hamon, and Hargreaves-Samani) and three radiation based (Turc, Makkink, and Priestley-Taylor) PET methods are compared. Long term water balances (precipitation, streamflow, and AET) for 36 forest dominated watersheds from 0.25 to 8213 km~2 in size were estimated using associated hydrometeorological and land use databases. The study found that PET values calculated from the six methods were highly correlated (Pearson Correlation Coefficient 0.85 to 1.00). Multivariate statistical tests, however, showed that PET values from different methods were significantly different from each other. Greater differences were found among the temperature based PET methods than radiation based PET methods. In general, the Priestley-Taylor, Turc, and Hamon methods performed better than the other PET methods. Based on the criteria of availability of input data and correlations with AET values, the Priestley-Taylor, Turc, and Hamon methods are recommended for regional applications in the southeastern United States.
机译：潜在蒸散量（PET）是不同空间尺度上水文预算的重要指标，并且是理解区域生物过程的关键变量。在估算降雨径流和生态系统模型中的实际蒸散量（AET）时，它通常是重要的变量。然而，PET在文献中以不同的方式定义，并且使用现有数学公式对PET进行定量估计会产生不一致的结果。这项研究的目的是对比六种常用的PET方法，并在美国东南部36个森林流域的地貌梯度上对长期年度PET进行量化。比较了三种基于温度的方法（Thornthwaite，Hamon和Hargreaves-Samani）和三种基于辐射的方法（Turc，Makkink和Priestley-Taylor）PET方法。利用相关的水文气象和土地利用数据库，估算了0.25至8213 km〜2的36个森林为主的流域的长期水平衡（降水，水流和AET）。研究发现，通过六种方法计算出的PET值高度相关（Pearson相关系数为0.85至1.00）。然而，多变量统计检验表明，不同方法的PET值彼此之间存在显着差异。与基于辐射的PET方法相比，基于温度的PET方法之间的差异更大。通常，Priestley-Taylor，Turc和Hamon方法的性能优于其他PET方法。根据输入数据可用性的标准以及与AET值的相关性，建议在美国东南部的区域应用中使用Priestley-Taylor，Turc和Hamon方法。

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