European Journal Of Advances In Engineering And Technology
Published July 31, 2021 | Version v1
Journal article Open

Comparison of Reference Evapotranspiration Estimation Models

Authors/Creators

  • 1. Department of Agricultural & Bio-Environmental Engineering, Auchi Polytechnic, Auchi, Nigeria
  • 2. Department of Civil Engineering, Auchi Polytechnic, Auchi, Nigeria
  • 3. Department of Mineral & Petroleum Engineering Technology, Auchi Polytechnic, Auchi, Nigeria
  • 4. Department of Agricultural & Bio-Environmental Engineering, The Federal Polytechnic, Ado-Ekiti

Description

ABSTRACT

Reference evapotranspiration (ETo) is an important factor in estimating crop water requirement and water resource management. This research study compares the performance of open pans and Blaney Criddle (BC) to CROPWAT irrigation simulation software using 15-year daily weather data of Auchi was acquired from the Nigeria Meteorological Station (NMET). The accuracy of each model was evaluated using various statistical metrics. ETo estimated from the four models were compared with CROPWAT model, an irrigation software program used for solar radiation (RS), reference evapotranspiration (ETo) and crop water requirement (CWR) calculations. Validation outputs have the correlation values (R2) of 0.587, 0.536, 0.511 and 0.513 for EToBC-ETo CROPWAT, EToBT-EToCROPWAT, ETo AUS-ETo CROPWAT, and EToUS-EToCROPWAT respectively. This result indicates marginal good fit between the estimated Reference evapotranspiration (ETo) from each model and CROPWAT irrigation software. However, there were discrepancies between the simulated and computed reference evapotranspiration (ETo) for the model with Blaney Criddle and Australia pan having correlation (R2) and bias value (AB) of 0.223; 0.241 and 2.30; 2.00 respectively. In conclusion, these reference evapotranspiration (ETo) estimating models are capable of providing realistic result which will be useful for water resources management.

Files

EJAET-8-7-39-46.pdf

Files (976.2 kB)

Name Size Download all
md5:80ba443de56e0885015a90fe815e41de
976.2 kB Preview Download

Additional details

References

  • [1]. Allen, R.G., Clemmens, A., Burt, C., Solomon, K. O'Halloran T. (2005). 'Prediction accuracy for project wide evapotranspiration using crop coefficients and reference evapotranspiration'. J Irrig Drain Eng. ASCE 131: 24-36.
  • [2]. Allen, R.G., Pruitt W.O., Wright JL., Howell T.A., Ventura F., et al. (2006) 'A recommendation on standardized surface resistance for hourly calculation of reference ETo by the FAO56 Penman–Monteith method'. Agric Water Manage 81: 1-22.
  • [3]. Burnett, P. W. D. (2007). 'Water resources of Kerala' public work department. Kerala.
  • [4]. Jannet, S. (1996). 'Water resources information for all the river basin in Kerala'. Centre for water resources management and development. Kozhikode.
  • [5]. FAO, 2003
  • [6]. Allen, R.G., Pereira, L., Raes, D., Smith, M. (1998). 'Crop evapotranspiration (guidelines for computing crop water requirements)'. Irrigation and Drainage, Paper No 56 FAO, Rome.
  • [7]. Patel, et al. (2017). 'Reference evapotranspiration estimation using CROPWAT model at Ludhiana District (PUNJAB)'. International journal of science, Environment and Technology, Vol. 6, No 1, 2017, 620-629.
  • [8]. Doorenbos, J., Pruitt, W.O. (1977). 'Crop water requirements (Land and Water Development Division), Irrigation and drainage paper 24. FAO, Rome.
  • [9]. David, A.S., Suyker, A. E., Verma, S. B. (2003). 'Evapotranspiration of irrigated and rainfed maize- soybeans cropping systems'. Agricultural and forest meteorology doi: 10.1016/j. agrformet.
  • [10]. Watson, I. and Burnett A.D. (1995). 'Hydrology: An Environmental Approach'. CRC Press, Boca Raton, FL.
  • [11]. Thornthwaite, C. W. (1948). 'An approach towards a rational classification of climate': Geogr Revue, 38.
  • [12]. Olotu, Y., Philipa, O.I. and Alumi, L. O. (2010). 'Climate change on Discharge and sedimentation of River Awara. Nigeria.