Potential Evapotranspiration Model for Muda Irrigation Project, Malaysia

Abstract

Methods to estimate free-surface evaporation E p and potential evapotranspiration ET p using well known models, namely, Penman-Monteith model, modified Penman method, Food and Agriculture Organization Penman-Monteith (FAO-PM) method, Blaney-Criddle method, and Christiansen method, without calibrating any model calibration parameters, for monthly time series are presented. The long-term monthly averaged daily models results are calculated using recorded average historic meteorological data (1980)(1981)(1982)(1983)(1984)(1985)(1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997) and compared with the USBR Class-A black pan evaporation data obtained from the Muda Agricultural Development Authority, Malaysia. The comparison results of the long-term monthly averaged daily estimates of E p using these models show that the E p values for the Penman-Monteith model and FAO-PM method for different months are found to be compared satisfactorily with the recorded pan evaporation data. The results of the estimated E p values for different months, the variations of relative errors in different months, the values of mean monthly differences between recorded and estimated E p , and the comparison between the models annual E p with the recorded annual E p , using these models suggest that the Penman-Monteith model can be selected as the best model in E p estimation in the Muda Irrigation Project, Malaysia. The FAO-PM method can be considered as the second best model, successively followed by the Blaney-Criddle method, modified Penman method, and Christiansen method. Thus, the results of the PenmanMonteith model can be interpreted as the validation of the E p model and can safely be used in ET p estimation in the Muda Irrigation Project, Malaysia.

Evaluation and calibration of Blaney–Criddle equation for estimating reference evapotranspiration in semiarid and arid regions

“…The results of another study showed that the Hargreaves and BC equations were the best ones for Davis in California and Jagdalpur in India with arid and humid climates, respectively (George et al 2002a, b). Good performance of the BC equation may stem from its original development for humid areas where the advective effect is usually negligible and has been reported by several researchers (Irmak et al 2003a, b;Ali and Shui 2009). About inverse modelling of hydrological models, Vrugt et al (2003) presented an efficient and effective Markov Chain Monte Carlo sampler, entitled the Multiobjective Shuffled Complex Evolution Metropolis (MOSCEM) algorithm, which is capable of solving the multiobjective optimization problem for hydrological models.…”

Crop Reference Evapotranspiration: A Discussion of the Concept, Analysis of the Process and Validation

“…Nowadays, this concept is practically disappeared from international literature, except in hydrology where it is considered as a robust input parameter (Douglas et al 2009) to model at catchment scale. Recent papers (Lu et al 2005;Oudin et al 2005;Weiss and Menzel 2008;Verstraeten et al 2008;Douglas et al 2009;Trajkovic and Kolakovic 2009;Hazrat Ali and Yeang Shui 2009;Donohoue et al 2010) still continue to debate and analyse differences among methods adopted in the calculation of PET.…”

GIS-Integrated Rice Irrigation Management Information System for a River-Fed Scheme

“…Ali et al (2000) has studied calculated and recorded average historic meteorological data (1980)(1981)(1982)(1983)(1984)(1985)(1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997) for the Muda Agricultural Development Authority, Malaysia. This study suggests FAO-Penman Monteith method can be considered as the second best model (Ali and Lee 2008). However, this model was found to be suitable in Tanjung Karang Irrigation Scheme, Malaysia.…”