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Estimating Reference Evapotranspiration Under Inaccurate Data Conditions
Abstract Reference evapotranspiration ($ ET_{0} $)estimates have been computed on a globalscale using a high-resolution monthlyclimate dataset. Penman-Monteith (PM) andHargreaves (HG) methods have been compared,showing very reasonable agreement betweenthe two methods. Fitting the two parametersof HG using the PM derived $ ET_{0} $ valuesdid not improve estimates by the HG methodsubstantially. Modifying the originalHargreaves method to a Modified-Hargreaves(MH) method by including a rainfall termimproved $ ET_{0} $ estimates significantlyfor arid regions. When a certain level ofinaccuracy in the meteorologicalobservations was assumed, $ calculatingET_{0} $ by PM and MH, given theseinaccuracy in observations, showed that MHperformed better than PM in reproducingoriginal calculations of $ ET_{0} $ ascalculated by PM assuming no data error. Itis concluded that the PM is a recommendedmethodology if accurate weather datacollection can be expected, but otherwiseMH should be considered.
Estimating Reference Evapotranspiration Under Inaccurate Data Conditions
Abstract Reference evapotranspiration ($ ET_{0} $)estimates have been computed on a globalscale using a high-resolution monthlyclimate dataset. Penman-Monteith (PM) andHargreaves (HG) methods have been compared,showing very reasonable agreement betweenthe two methods. Fitting the two parametersof HG using the PM derived $ ET_{0} $ valuesdid not improve estimates by the HG methodsubstantially. Modifying the originalHargreaves method to a Modified-Hargreaves(MH) method by including a rainfall termimproved $ ET_{0} $ estimates significantlyfor arid regions. When a certain level ofinaccuracy in the meteorologicalobservations was assumed, $ calculatingET_{0} $ by PM and MH, given theseinaccuracy in observations, showed that MHperformed better than PM in reproducingoriginal calculations of $ ET_{0} $ ascalculated by PM assuming no data error. Itis concluded that the PM is a recommendedmethodology if accurate weather datacollection can be expected, but otherwiseMH should be considered.
Estimating Reference Evapotranspiration Under Inaccurate Data Conditions
Droogers, Peter (author) / Allen, Richard G. (author)
2002
Article (Journal)
English
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