Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions

Muhammad Hafeez; Alamgir Akhtar Khan

doi:doi:10.11648/j.ajset.20180304.11

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Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions

Muhammad Hafeez, Alamgir Akhtar Khan

Published in American Journal of Science, Engineering and Technology (Volume 3, Issue 4)

Received: 30 November 2018 Accepted: 17 December 2018 Published: 22 January 2019

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Abstract

There are a lot of weather stations of the world like Pakistan where all the metrological parameters are not accessible to evaluate PM method for the approximation of ETo. So ablatives methods like Hargreaves and Blaney-Criddle methods are used which required small numbers of metrological parameters. A study has been directed to assess the accuracy of Hargreaves and Blaney-Criddle methods against standard PM method for approximation of reference evapotranspiration (ETo) in coastal arid locations of Sindh and Baluchistan. The statistical evaluation of the study indicated that the Hargreaves method underestimated ETo by 44.61%, 30.86%, 27.03% and 37.8% at Karachi, Gawadar, Jiwani and Pasni, respectively. The Blaney-Criddle method underestimated ETo in winter and overestimated ETo in summer by 14.91% at Karachi station, overestimated ETo by 23.98% at Gawadar station, underestimated ETo in January and December and overestimated ETo in remaining months by 22.38% at Jiwani station and overestimated ETo by 27.25% at Pasni station. The difference of variations of Hargreaves (HG) method with PM method with RMSE were 2.03 mm/day, 1.46 mm/day, 1.21 mm/day and 1.65 mm/day at Karachi, Gawadar, Jiwani and Pasni stations, respectively. The difference of variations of BC method with PM method with RMSE were 1.98 mm/day, 2.42 mm/day, 2.16 mm/day and 2.89 mm/day at Karachi, Gawadar, Jiwani and Pasni stations, respectively. The R² with Hargreaves method were 0.95, 0.92, 0.89 and 0.97 at Karachi, Gawadar, Jiwani and Pasni, respectively. The R² with BC method were 0.59, 0.78, 0.86 and 0.78 at Karachi, Gawadar, Jiwani and Pasni stations, respectively.

Published in	American Journal of Science, Engineering and Technology (Volume 3, Issue 4)
DOI	10.11648/j.ajset.20180304.11
Page(s)	65-72
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Hargreaves, Blaney-Criddle, ETo, Coastal, Sindh, Baluchistan

References

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Muhammad Hafeez, Alamgir Akhtar Khan. (2019). Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions. American Journal of Science, Engineering and Technology, 3(4), 65-72. https://doi.org/10.11648/j.ajset.20180304.11

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ACS Style

Muhammad Hafeez; Alamgir Akhtar Khan. Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions. Am. J. Sci. Eng. Technol. 2019, 3(4), 65-72. doi: 10.11648/j.ajset.20180304.11

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AMA Style

Muhammad Hafeez, Alamgir Akhtar Khan. Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions. Am J Sci Eng Technol. 2019;3(4):65-72. doi: 10.11648/j.ajset.20180304.11

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@article{10.11648/j.ajset.20180304.11,
  author = {Muhammad Hafeez and Alamgir Akhtar Khan},
  title = {Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions},
  journal = {American Journal of Science, Engineering and Technology},
  volume = {3},
  number = {4},
  pages = {65-72},
  doi = {10.11648/j.ajset.20180304.11},
  url = {https://doi.org/10.11648/j.ajset.20180304.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajset.20180304.11},
  abstract = {There are a lot of weather stations of the world like Pakistan where all the metrological parameters are not accessible to evaluate PM method for the approximation of ETo. So ablatives methods like Hargreaves and Blaney-Criddle methods are used which required small numbers of metrological parameters. A study has been directed to assess the accuracy of Hargreaves and Blaney-Criddle methods against standard PM method for approximation of reference evapotranspiration (ETo) in coastal arid locations of Sindh and Baluchistan. The statistical evaluation of the study indicated that the Hargreaves method underestimated ETo by 44.61%, 30.86%, 27.03% and 37.8% at Karachi, Gawadar, Jiwani and Pasni, respectively. The Blaney-Criddle method underestimated ETo in winter and overestimated ETo in summer by 14.91% at Karachi station, overestimated ETo by 23.98% at Gawadar station, underestimated ETo in January and December and overestimated ETo in remaining months by 22.38% at Jiwani station and overestimated ETo by 27.25% at Pasni station. The difference of variations of Hargreaves (HG) method with PM method with RMSE were 2.03 mm/day, 1.46 mm/day, 1.21 mm/day and 1.65 mm/day at Karachi, Gawadar, Jiwani and Pasni stations, respectively. The difference of variations of BC method with PM method with RMSE were 1.98 mm/day, 2.42 mm/day, 2.16 mm/day and 2.89 mm/day at Karachi, Gawadar, Jiwani and Pasni stations, respectively. The R2 with Hargreaves method were 0.95, 0.92, 0.89 and 0.97 at Karachi, Gawadar, Jiwani and Pasni, respectively. The R2 with BC method were 0.59, 0.78, 0.86 and 0.78 at Karachi, Gawadar, Jiwani and Pasni stations, respectively.},
 year = {2019}
}

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TY  - JOUR
T1  - Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions
AU  - Muhammad Hafeez
AU  - Alamgir Akhtar Khan
Y1  - 2019/01/22
PY  - 2019
N1  - https://doi.org/10.11648/j.ajset.20180304.11
DO  - 10.11648/j.ajset.20180304.11
T2  - American Journal of Science, Engineering and Technology
JF  - American Journal of Science, Engineering and Technology
JO  - American Journal of Science, Engineering and Technology
SP  - 65
EP  - 72
PB  - Science Publishing Group
SN  - 2578-8353
UR  - https://doi.org/10.11648/j.ajset.20180304.11
AB  - There are a lot of weather stations of the world like Pakistan where all the metrological parameters are not accessible to evaluate PM method for the approximation of ETo. So ablatives methods like Hargreaves and Blaney-Criddle methods are used which required small numbers of metrological parameters. A study has been directed to assess the accuracy of Hargreaves and Blaney-Criddle methods against standard PM method for approximation of reference evapotranspiration (ETo) in coastal arid locations of Sindh and Baluchistan. The statistical evaluation of the study indicated that the Hargreaves method underestimated ETo by 44.61%, 30.86%, 27.03% and 37.8% at Karachi, Gawadar, Jiwani and Pasni, respectively. The Blaney-Criddle method underestimated ETo in winter and overestimated ETo in summer by 14.91% at Karachi station, overestimated ETo by 23.98% at Gawadar station, underestimated ETo in January and December and overestimated ETo in remaining months by 22.38% at Jiwani station and overestimated ETo by 27.25% at Pasni station. The difference of variations of Hargreaves (HG) method with PM method with RMSE were 2.03 mm/day, 1.46 mm/day, 1.21 mm/day and 1.65 mm/day at Karachi, Gawadar, Jiwani and Pasni stations, respectively. The difference of variations of BC method with PM method with RMSE were 1.98 mm/day, 2.42 mm/day, 2.16 mm/day and 2.89 mm/day at Karachi, Gawadar, Jiwani and Pasni stations, respectively. The R2 with Hargreaves method were 0.95, 0.92, 0.89 and 0.97 at Karachi, Gawadar, Jiwani and Pasni, respectively. The R2 with BC method were 0.59, 0.78, 0.86 and 0.78 at Karachi, Gawadar, Jiwani and Pasni stations, respectively.
VL  - 3
IS  - 4
ER  -

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Author Information

Muhammad Hafeez

Department of Agricultural Engineering, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Pakistan
Alamgir Akhtar Khan

Department of Agricultural Engineering, Muhammad Nawaz Sharif University of Agriculture, Multan, Pakistan

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APA Style

Muhammad Hafeez, Alamgir Akhtar Khan. (2019). Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions. American Journal of Science, Engineering and Technology, 3(4), 65-72. https://doi.org/10.11648/j.ajset.20180304.11

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ACS Style

Muhammad Hafeez; Alamgir Akhtar Khan. Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions. Am. J. Sci. Eng. Technol. 2019, 3(4), 65-72. doi: 10.11648/j.ajset.20180304.11

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AMA Style

Muhammad Hafeez, Alamgir Akhtar Khan. Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions. Am J Sci Eng Technol. 2019;3(4):65-72. doi: 10.11648/j.ajset.20180304.11

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@article{10.11648/j.ajset.20180304.11,
  author = {Muhammad Hafeez and Alamgir Akhtar Khan},
  title = {Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions},
  journal = {American Journal of Science, Engineering and Technology},
  volume = {3},
  number = {4},
  pages = {65-72},
  doi = {10.11648/j.ajset.20180304.11},
  url = {https://doi.org/10.11648/j.ajset.20180304.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajset.20180304.11},
  abstract = {There are a lot of weather stations of the world like Pakistan where all the metrological parameters are not accessible to evaluate PM method for the approximation of ETo. So ablatives methods like Hargreaves and Blaney-Criddle methods are used which required small numbers of metrological parameters. A study has been directed to assess the accuracy of Hargreaves and Blaney-Criddle methods against standard PM method for approximation of reference evapotranspiration (ETo) in coastal arid locations of Sindh and Baluchistan. The statistical evaluation of the study indicated that the Hargreaves method underestimated ETo by 44.61%, 30.86%, 27.03% and 37.8% at Karachi, Gawadar, Jiwani and Pasni, respectively. The Blaney-Criddle method underestimated ETo in winter and overestimated ETo in summer by 14.91% at Karachi station, overestimated ETo by 23.98% at Gawadar station, underestimated ETo in January and December and overestimated ETo in remaining months by 22.38% at Jiwani station and overestimated ETo by 27.25% at Pasni station. The difference of variations of Hargreaves (HG) method with PM method with RMSE were 2.03 mm/day, 1.46 mm/day, 1.21 mm/day and 1.65 mm/day at Karachi, Gawadar, Jiwani and Pasni stations, respectively. The difference of variations of BC method with PM method with RMSE were 1.98 mm/day, 2.42 mm/day, 2.16 mm/day and 2.89 mm/day at Karachi, Gawadar, Jiwani and Pasni stations, respectively. The R2 with Hargreaves method were 0.95, 0.92, 0.89 and 0.97 at Karachi, Gawadar, Jiwani and Pasni, respectively. The R2 with BC method were 0.59, 0.78, 0.86 and 0.78 at Karachi, Gawadar, Jiwani and Pasni stations, respectively.},
 year = {2019}
}

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TY  - JOUR
T1  - Assessment of Hargreaves and Blaney-Criddle Methods to Estimate Reference Evapotranspiration Under Coastal Conditions
AU  - Muhammad Hafeez
AU  - Alamgir Akhtar Khan
Y1  - 2019/01/22
PY  - 2019
N1  - https://doi.org/10.11648/j.ajset.20180304.11
DO  - 10.11648/j.ajset.20180304.11
T2  - American Journal of Science, Engineering and Technology
JF  - American Journal of Science, Engineering and Technology
JO  - American Journal of Science, Engineering and Technology
SP  - 65
EP  - 72
PB  - Science Publishing Group
SN  - 2578-8353
UR  - https://doi.org/10.11648/j.ajset.20180304.11
AB  - There are a lot of weather stations of the world like Pakistan where all the metrological parameters are not accessible to evaluate PM method for the approximation of ETo. So ablatives methods like Hargreaves and Blaney-Criddle methods are used which required small numbers of metrological parameters. A study has been directed to assess the accuracy of Hargreaves and Blaney-Criddle methods against standard PM method for approximation of reference evapotranspiration (ETo) in coastal arid locations of Sindh and Baluchistan. The statistical evaluation of the study indicated that the Hargreaves method underestimated ETo by 44.61%, 30.86%, 27.03% and 37.8% at Karachi, Gawadar, Jiwani and Pasni, respectively. The Blaney-Criddle method underestimated ETo in winter and overestimated ETo in summer by 14.91% at Karachi station, overestimated ETo by 23.98% at Gawadar station, underestimated ETo in January and December and overestimated ETo in remaining months by 22.38% at Jiwani station and overestimated ETo by 27.25% at Pasni station. The difference of variations of Hargreaves (HG) method with PM method with RMSE were 2.03 mm/day, 1.46 mm/day, 1.21 mm/day and 1.65 mm/day at Karachi, Gawadar, Jiwani and Pasni stations, respectively. The difference of variations of BC method with PM method with RMSE were 1.98 mm/day, 2.42 mm/day, 2.16 mm/day and 2.89 mm/day at Karachi, Gawadar, Jiwani and Pasni stations, respectively. The R2 with Hargreaves method were 0.95, 0.92, 0.89 and 0.97 at Karachi, Gawadar, Jiwani and Pasni, respectively. The R2 with BC method were 0.59, 0.78, 0.86 and 0.78 at Karachi, Gawadar, Jiwani and Pasni stations, respectively.
VL  - 3
IS  - 4
ER  -

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