In: Journal of Hydrology and Hydromechanics, vol. 67, no. 3
Jitka Kofroňová - Miroslav Tesař - Václav Šípek
Detaily:
Rok, strany: 2019, 280 - 288
Kľúčové slová:
Radiation balance; Longwave radiation; Potential evapotranspiration; Penman-Monteith; Calibration.
URL originálneho zdroja: http://www.ih.sav.sk/jhh
O článku:
Longwave radiation, as part of the radiation balance, is one of the factors needed to estimate potential evapotranspiration
(PET). Since the longwave radiation balance is rarely measured, many computational methods have been
designed. In this study, we report on the difference between the observed longwave radiation balance and modelling results
obtained using the two main procedures outlined in FAO24 (relying on the measured sunshine duration) and
FAO56 (based on the measured solar radiation) manuals. The performance of these equations was evaluated in the
April–October period over eight years at the Liz experimental catchment and grass surface in the Bohemian Forest
(Czech Republic). The coefficients of both methods, which describe the influence of cloudiness factor and atmospheric
emissivity of the air, were calibrated. The Penman-Monteith method was used to calculate the PET. The use of default
coefficient values gave errors of 40–100 mm (FAO56) and 0–20 mm (FAO24) for the seasonal PET estimates (the PET
was usually overestimated). Parameter calibration decreased the FAO56 error to less than 20 mm per season (FAO24
remained unaffected by the calibration). The FAO56 approach with calibrated coefficients proved to be more suitable for
estimation of the longwave radiation balance.
Ako citovať:
ISO 690:
Kofroňová, J., Tesař, M., Šípek, V. 2019. The influence of observed and modelled net longwave radiation on the rate of
estimated potential evapotranspiration. In Journal of Hydrology and Hydromechanics, vol. 67, no.3, pp. 280-288. 0042-790X (until 2019) . DOI: https://doi.org/10.2478/johh-2019-0011
APA:
Kofroňová, J., Tesař, M., Šípek, V. (2019). The influence of observed and modelled net longwave radiation on the rate of
estimated potential evapotranspiration. Journal of Hydrology and Hydromechanics, 67(3), 280-288. 0042-790X (until 2019) . DOI: https://doi.org/10.2478/johh-2019-0011
O vydaní: