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Estimating the reference evapotranspiration values by using FAO-56PM in Aydoghmush river basin
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Parviz Kardavani   , Mohammad Hossein Qalehe |
| Department of Geography, Science and Research Branch, Islamic |
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Abstract: (12954 Views) |
| Food and Agriculture Organization(FAO), has offered the
Penman model (FAO-56PM) as a standard model to estimate
reference evapotranspiration of crops. The lack of some
climatological variables such as solar radiation, relative humidity
and wind speed can be a major obstacle in estimating
evapotranspiration by FAO-56PM. To overcome this problem, a
series of relations and equations is used in the form of the Penman
model. By considering these facts, assessmentthe accuracy and
validity of this model in different regions, is important. In this
studythe equations for estimating the parameters of wind speed ,
relative humidity and solar radiation were used, and finally the
potential evapotranspiration was estimated in the Aydoghmush
basin. For this purpose, data of 5 climatological stations in
Aydoghmush river basinwas used. Comparing estimated and
obtained evapotranspiration values, determined that there is a small
difference between ETO values in both cases. In this study, the
highest and lowest values of RMSE and MBE have been estimated
from 0.227 to 0.971 and -0.271 to 0.724 respectively. According to
the results it can be said that by using the computational data
evapotranspiration values can be estimated with the greatest
accuracy. |
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| Keywords: FAO-56PM model, Reference evapotranspiration, Climatological parameters, Aydoghmush river basin |
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Full-Text [PDF 259 kb]
(1930 Downloads)
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Type of Study: Research |
Subject:
General
Received: 2014/04/5 | Accepted: 2014/04/5 | Published: 2014/04/5
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