Statistical analysis of modified Hargreaves equation for precise estimation of reference evapotranspiration

There are a lot of meteorological stations around the world, like Pakistan, where all the meteorological parameters are not accessible to analyze Penman-Monteith (PM) method for the estimation of Reference Evapotranspiration (ETo). So ablative methods such as Hargreaves Samani (HS) equation are ther...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Rimsha Habeeb, Xiang Zhang, Ijaz Hussain, Muhammad Zaffar Hashmi, Elsayed Elsherbini Elashkar, Jameel Ahmad Khader, Sadaf Shamshoddin Soudagar, Alaa Mohamd Shoukry, Zulfiqar Ali, Fares Fawzi Al-Deek
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	ablative evapotranspiration imprecision calibrated conventional indicators Oceanography GC1-1581 Meteorology. Climatology QC851-999
Acceso en línea:	https://doaj.org/article/3ba5960c2287423ba24b3870a24d2318
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:3ba5960c2287423ba24b3870a24d2318
record_format	dspace
spelling	oai:doaj.org-article:3ba5960c2287423ba24b3870a24d23182021-12-01T14:40:59ZStatistical analysis of modified Hargreaves equation for precise estimation of reference evapotranspiration1600-087010.1080/16000870.2021.1966869https://doaj.org/article/3ba5960c2287423ba24b3870a24d23182021-01-01T00:00:00Zhttp://dx.doi.org/10.1080/16000870.2021.1966869https://doaj.org/toc/1600-0870There are a lot of meteorological stations around the world, like Pakistan, where all the meteorological parameters are not accessible to analyze Penman-Monteith (PM) method for the estimation of Reference Evapotranspiration (ETo). So ablative methods such as Hargreaves Samani (HS) equation are therefore a potential solution to this problem, which required small numbers of meteorological parameters to estimate ETo. But, simplification brings imprecision and the need for regional calibration of the HS equation’s constant. In this study, fuzzy logic based calibration of the constants in the HS equation at the various climatic locations of Pakistan for the period of 1980 − 2019 is performed. The precision of HS and Modified HS (MHS) against standard PM method for the approximation of ETo was evaluated and compared the calibration process of HS equation by adjusting the coefficients of the equation gradually. The performance of the MHS is evaluated based on the statistical indicators such as Mean Absolute Error (MAE), Root Mean Square Error (RMSE), and Performance Index (PI). The statistical assessment of the study revealed that the MHS equation performed better as compared to the conventional HS equation and simultaneous adjustment of all the empirical parameters “ah”, “bh”,”ch” and “dh” was the best alternative for calibration of the HS equation. Furthermore, the change point detection analysis has been carried out on ETo (estimated by MHS) using Pettitt’s test, Buishand’s range test and Buishand’s U test. Results of the change point analysis indicated different change points from year 1980 to 2019, mainly due to the industrialization and urbanization during this time period.Rimsha HabeebXiang ZhangIjaz HussainMuhammad Zaffar HashmiElsayed Elsherbini ElashkarJameel Ahmad KhaderSadaf Shamshoddin SoudagarAlaa Mohamd ShoukryZulfiqar AliFares Fawzi Al-DeekTaylor & Francis GrouparticleablativeevapotranspirationimprecisioncalibratedconventionalindicatorsOceanographyGC1-1581Meteorology. ClimatologyQC851-999ENTellus: Series A, Dynamic Meteorology and Oceanography, Vol 73, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ablative evapotranspiration imprecision calibrated conventional indicators Oceanography GC1-1581 Meteorology. Climatology QC851-999
spellingShingle	ablative evapotranspiration imprecision calibrated conventional indicators Oceanography GC1-1581 Meteorology. Climatology QC851-999 Rimsha Habeeb Xiang Zhang Ijaz Hussain Muhammad Zaffar Hashmi Elsayed Elsherbini Elashkar Jameel Ahmad Khader Sadaf Shamshoddin Soudagar Alaa Mohamd Shoukry Zulfiqar Ali Fares Fawzi Al-Deek Statistical analysis of modified Hargreaves equation for precise estimation of reference evapotranspiration
description	There are a lot of meteorological stations around the world, like Pakistan, where all the meteorological parameters are not accessible to analyze Penman-Monteith (PM) method for the estimation of Reference Evapotranspiration (ETo). So ablative methods such as Hargreaves Samani (HS) equation are therefore a potential solution to this problem, which required small numbers of meteorological parameters to estimate ETo. But, simplification brings imprecision and the need for regional calibration of the HS equation’s constant. In this study, fuzzy logic based calibration of the constants in the HS equation at the various climatic locations of Pakistan for the period of 1980 − 2019 is performed. The precision of HS and Modified HS (MHS) against standard PM method for the approximation of ETo was evaluated and compared the calibration process of HS equation by adjusting the coefficients of the equation gradually. The performance of the MHS is evaluated based on the statistical indicators such as Mean Absolute Error (MAE), Root Mean Square Error (RMSE), and Performance Index (PI). The statistical assessment of the study revealed that the MHS equation performed better as compared to the conventional HS equation and simultaneous adjustment of all the empirical parameters “ah”, “bh”,”ch” and “dh” was the best alternative for calibration of the HS equation. Furthermore, the change point detection analysis has been carried out on ETo (estimated by MHS) using Pettitt’s test, Buishand’s range test and Buishand’s U test. Results of the change point analysis indicated different change points from year 1980 to 2019, mainly due to the industrialization and urbanization during this time period.
format	article
author	Rimsha Habeeb Xiang Zhang Ijaz Hussain Muhammad Zaffar Hashmi Elsayed Elsherbini Elashkar Jameel Ahmad Khader Sadaf Shamshoddin Soudagar Alaa Mohamd Shoukry Zulfiqar Ali Fares Fawzi Al-Deek
author_facet	Rimsha Habeeb Xiang Zhang Ijaz Hussain Muhammad Zaffar Hashmi Elsayed Elsherbini Elashkar Jameel Ahmad Khader Sadaf Shamshoddin Soudagar Alaa Mohamd Shoukry Zulfiqar Ali Fares Fawzi Al-Deek
author_sort	Rimsha Habeeb
title	Statistical analysis of modified Hargreaves equation for precise estimation of reference evapotranspiration
title_short	Statistical analysis of modified Hargreaves equation for precise estimation of reference evapotranspiration
title_full	Statistical analysis of modified Hargreaves equation for precise estimation of reference evapotranspiration
title_fullStr	Statistical analysis of modified Hargreaves equation for precise estimation of reference evapotranspiration
title_full_unstemmed	Statistical analysis of modified Hargreaves equation for precise estimation of reference evapotranspiration
title_sort	statistical analysis of modified hargreaves equation for precise estimation of reference evapotranspiration
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/3ba5960c2287423ba24b3870a24d2318
work_keys_str_mv	AT rimshahabeeb statisticalanalysisofmodifiedhargreavesequationforpreciseestimationofreferenceevapotranspiration AT xiangzhang statisticalanalysisofmodifiedhargreavesequationforpreciseestimationofreferenceevapotranspiration AT ijazhussain statisticalanalysisofmodifiedhargreavesequationforpreciseestimationofreferenceevapotranspiration AT muhammadzaffarhashmi statisticalanalysisofmodifiedhargreavesequationforpreciseestimationofreferenceevapotranspiration AT elsayedelsherbinielashkar statisticalanalysisofmodifiedhargreavesequationforpreciseestimationofreferenceevapotranspiration AT jameelahmadkhader statisticalanalysisofmodifiedhargreavesequationforpreciseestimationofreferenceevapotranspiration AT sadafshamshoddinsoudagar statisticalanalysisofmodifiedhargreavesequationforpreciseestimationofreferenceevapotranspiration AT alaamohamdshoukry statisticalanalysisofmodifiedhargreavesequationforpreciseestimationofreferenceevapotranspiration AT zulfiqarali statisticalanalysisofmodifiedhargreavesequationforpreciseestimationofreferenceevapotranspiration AT faresfawzialdeek statisticalanalysisofmodifiedhargreavesequationforpreciseestimationofreferenceevapotranspiration
_version_	1718404985849380864

Statistical analysis of modified Hargreaves equation for precise estimation of reference evapotranspiration

Ejemplares similares