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首页> 外文期刊>Nordic hydrology >Evaluation of the FAO Penman-Montheith, Priestley- Taylor and Hargreaves models for estimating reference evapotranspiration in southern Malawi
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Evaluation of the FAO Penman-Montheith, Priestley- Taylor and Hargreaves models for estimating reference evapotranspiration in southern Malawi

机译：评估粮农组织Penman-Montheith，Priestley-Taylor和Hargreaves模型以估计马拉维南部的参考蒸散量

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摘要

This study evaluated the performance of the Food and Agriculture Organization (FAO) Penman-Monteith (PM) reference evapotranspiration (ET_0) method for various limited data scenarios in southern Malawi. The study further evaluated the full data PM method against the radiation-based Priestley-Taylor (PT) and the temperature-based Hargreaves (HAG) methods, which are less data-intensive approaches commonly used to estimate ET_0 in data-scarce situations. A comprehensive daily climate dataset observed at the Nchalo Sugar Estate in southern Malawi for the period 1971-2007 was the basis of the study. The results suggested that lack of data on wind speed and actual vapour pressure did not significantly affect the PM ET_0 estimates. However, the estimation of radiation using various combinations of observed wind speed and relative humidity all resulted in significant deviations from the PM ET_0. Further, the HAG and PT methods significantly underestimated the PM. However, the PM method computed with estimated climate variables instead of observed climate variables still outperformed both the PT and HAG methods if their original parameters and estimated radiation were used. Thus, new monthly parameters for the PT and the HAG methods are proposed for more accurate daily ET_0 estimates.
机译：这项研究评估了粮食和农业组织（FAO）Penman-Monteith（PM）参考蒸散量（ET_0）方法在马拉维南部各种有限数据场景下的效果。这项研究进一步评估了全数据PM方法与基于辐射的Priestley-Taylor（PT）方法和基于温度的Hargreaves（HAG）方法的比较，后者是数据量少的方法，通常在数据稀少的情况下用于估算ET_0。这项研究的基础是在马拉维南部Nchalo Sugar Estate观察到的1971-2007年期间的综合每日气候数据集。结果表明，缺乏风速和实际蒸气压的数据不会显着影响PM ET_0的估算值。但是，使用观察到的风速和相对湿度的各种组合来估计辐射，都会导致与PM ET_0的明显偏差。此外，HAG和PT方法大大低估了PM。但是，如果使用原始气候参数和估算辐射，则用估算气候变量而不是观测气候变量计算的PM方法仍然优于PT和HAG方法。因此，提出了用于PT和HAG方法的新的每月参数，以实现更准确的每日ET_0估计。

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  • 来源
    《Nordic hydrology》 |2013年第4期|706-722|共17页
  • 作者

    Cosmo Ngongondo; Chong-Yu Xu; Lena M. Tallaksen; Berhanu Alemaw;

  • 作者单位

    Department of Geosciences, university of Oslo, PO Box 1047, Blindern, Oslo, Norway,Department of Geography and Earth Sciences, University of Malawi, Chancellor College, PO Box 280, Zomba, Malawi;

    Department of Geosciences, university of Oslo, PO Box 1047, Blindern, Oslo, Norway;

    Department of Geosciences, university of Oslo, PO Box 1047, Blindern, Oslo, Norway;

    Department of Geology, University of Botswana, Pr. Bag 0022, Gaborone, Botswana;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    FAO Penman-Montheith; Hargreaves; Malawi; Priestley-Taylor; reference evapotranspiration;

    机译：粮农组织Penman-Monteith;哈格里夫斯马拉维;Priestley-Taylor;参考蒸散量;

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