Ethiopia Environment and Forest Research Institute (EEFRI), Ethiopia
Research
Comparison of Evaporation Schemes and Methods of Class a Pan Coefficient at Tharandt
Author(s): Antensay Mekoya*
At Tharandt, Germany for the summer half-year of 2004-2013, methods of estimation of Potential Evapo-Transpiration (PET) according to Haude, Wendling, and Penman and Class A pan evaporation (Ep) were compared with each other with respect to the reference evapo-transpiration (ETo) using box plot, trend check, linear regression model, and model evaluation statistics. Similarly, Class A pan coefficients (Kp) from the equation of Snyder and Frevert as well as a trial method of estimation of Kp were compared using box plots. For the calculation of ETo, calibrated values of as=0.014 and bs=0.50 were used. The total amount of summer half-year evaporation schemes were >459 mm while the precipitation was 478.8 mm; this implied that the climate water balance was close to zero. The result of the comparison showed that all the evaporation schemes had.. View More»
