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首页> 外文期刊>Journal of the American Water Resources Association >ADEQUACY OF SELECTED EVAPOTRANSPIRATION APPROXIMATIONS FOR HYDROLOGIC SIMULATION
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ADEQUACY OF SELECTED EVAPOTRANSPIRATION APPROXIMATIONS FOR HYDROLOGIC SIMULATION

机译：水文模拟中所选蒸发蒸腾近似的充分性

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摘要

Evapotranspiration (ET) approximations, usually based on computed potential ET (PET) and diverse PET-to-ET conceptualizations, are routinely used in hydrologic analyses. This study presents an approach to incorporate measured (actual) ET data, increasingly available using micrometeorologi-cal methods, to define the adequacy of ET approximations for hydrologic simulation. The approach is demonstrated at a site where eddy correlation-measured ET values were available. A baseline hydrologic model incorporating measured ET values was used to evaluate the sensitivity of simulated water levels, subsurface recharge, and surface runoff to error in four ET approximations. An annually invariant pattern of mean monthly vegetation coefficients was shown to be most effective, despite the substantial year-to-year variation in measured vegetation coefficients. The temporal variability of available water (precipitation minus ET) at the humid, subtropical site was largely controlled by the relatively high temporal variability of precipitation, benefiting the effectiveness of coarse ET approximations, a result that is likely to prevail at other humid sites.
机译：通常在水文分析中通常使用蒸发蒸腾（ET）近似值，通常基于计算的潜在ET（PET）和多样的PET-to-ET概念。这项研究提出了一种方法，该方法合并了已测量的（实际）ET数据（使用微气象学方法越来越多地使用），以定义用于水文模拟的ET近似值是否足够。该方法在有涡流相关测量的ET值的站点得到了证明。使用结合了测得的ET值的基线水文模型来评估模拟水位，地下补给和地表径流对四种ET近似误差的敏感性。尽管测得的植被系数逐年变化很大，但月平均植被系数的年不变模式被证明是最有效的。在亚热带湿润地区，可用水的时间变化（降水减去ET）在很大程度上受到相对较高的降水时间变化的影响，从而有利于粗略的ET近似值的有效性，这一结果很可能在其他湿润地区盛行。

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