Evaluation of different semivariogram models in groundwater quality mapping using GIS-based simple kriging at Khorasan Razavi-Iran

A high demand of the water usage at Khorasan Razavi-Iran was supplied from groundwater. The quality of this groundwater was determined by taking samples from 472 of the wells within the study area like SO4 and pH. This study was about to choose the best fitted semivariogram models to perform the op...

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Main Author:	Ng, Zone Fhong
Format:	Undergraduates Project Papers
Language:	English English English
Published:	2015
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/12186/ http://umpir.ump.edu.my/id/eprint/12186/ http://umpir.ump.edu.my/id/eprint/12186/1/FKASA%20-%20NG%20ZONE%20FHONG%20%28CD9217%29.pdf http://umpir.ump.edu.my/id/eprint/12186/7/FKASA%20-%20NG%20ZONE%20FHONG%20%28CD9217%29%20-%20CHAP%201.pdf http://umpir.ump.edu.my/id/eprint/12186/10/FKASA%20-%20NG%20ZONE%20FHONG%20%28CD9217%29%20-%20CHAP%203.pdf

id	ump-12186
recordtype	eprints
spelling	ump-121862016-03-17T02:56:45Z http://umpir.ump.edu.my/id/eprint/12186/ Evaluation of different semivariogram models in groundwater quality mapping using GIS-based simple kriging at Khorasan Razavi-Iran Ng, Zone Fhong TA Engineering (General). Civil engineering (General) A high demand of the water usage at Khorasan Razavi-Iran was supplied from groundwater. The quality of this groundwater was determined by taking samples from 472 of the wells within the study area like SO4 and pH. This study was about to choose the best fitted semivariogram models to perform the optimum result of the groundwater quality mapping by using point interpolation. In addition, this research also can show about the estimation accuracy versus the lag distance. The GIS-based software, ILWIS 3.4 was used for geostatistical analysis and generation of the groundwater quality map. The pixel size and lag distance used was 100m. An interpolation technique, Simple Kriging (SK), was applied to obtain the spatial distribution of groundwater quality parameters. In the result, the estimated semivariogram values were the best fitted semivariogram models that were Rational Quadratic model for SO4 and the Exponential model for pH. Evaluation of these semivariogram models and the estimation accuracy of SK methods was by Coefficient of Determination (R²), Nash-Sutcliffe Model Efficiency (E), and Root Mean Square Deviation (RMSD). For SO4 in Rational Quadratic model, it was 0.95 for R² which represent the highest value among others model, 0.95 for E which represent the highest also and 1.67 for RMSD which indicate the lowest error from the rest model. On the other hand, the predicted error for pH in Exponential model was 0.78 for R², 0.77 for E and the last was 0.18 for RMSD. Furthermore, the accuracy trend was illustrated in table form and figures that the error of the accuracy is getting worse for example the R² for SO4 in 500m lag with 0.96 was become lesser in 1500m that is 0.69. For the E from 500m to 1500m, the value was lesser as well as RMSD was increased due to the distance. All in all, the objectives were accepted. 2015-06 Undergraduates Project Papers NonPeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/12186/1/FKASA%20-%20NG%20ZONE%20FHONG%20%28CD9217%29.pdf application/pdf en http://umpir.ump.edu.my/id/eprint/12186/7/FKASA%20-%20NG%20ZONE%20FHONG%20%28CD9217%29%20-%20CHAP%201.pdf application/pdf en http://umpir.ump.edu.my/id/eprint/12186/10/FKASA%20-%20NG%20ZONE%20FHONG%20%28CD9217%29%20-%20CHAP%203.pdf Ng, Zone Fhong (2015) Evaluation of different semivariogram models in groundwater quality mapping using GIS-based simple kriging at Khorasan Razavi-Iran. Faculty of Civil Engineering & Earth Resources, Universiti Malaysia Pahang. http://iportal.ump.edu.my/lib/item?id=chamo:92064&theme=UMP2
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English English English
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) Ng, Zone Fhong Evaluation of different semivariogram models in groundwater quality mapping using GIS-based simple kriging at Khorasan Razavi-Iran
description	A high demand of the water usage at Khorasan Razavi-Iran was supplied from groundwater. The quality of this groundwater was determined by taking samples from 472 of the wells within the study area like SO4 and pH. This study was about to choose the best fitted semivariogram models to perform the optimum result of the groundwater quality mapping by using point interpolation. In addition, this research also can show about the estimation accuracy versus the lag distance. The GIS-based software, ILWIS 3.4 was used for geostatistical analysis and generation of the groundwater quality map. The pixel size and lag distance used was 100m. An interpolation technique, Simple Kriging (SK), was applied to obtain the spatial distribution of groundwater quality parameters. In the result, the estimated semivariogram values were the best fitted semivariogram models that were Rational Quadratic model for SO4 and the Exponential model for pH. Evaluation of these semivariogram models and the estimation accuracy of SK methods was by Coefficient of Determination (R²), Nash-Sutcliffe Model Efficiency (E), and Root Mean Square Deviation (RMSD). For SO4 in Rational Quadratic model, it was 0.95 for R² which represent the highest value among others model, 0.95 for E which represent the highest also and 1.67 for RMSD which indicate the lowest error from the rest model. On the other hand, the predicted error for pH in Exponential model was 0.78 for R², 0.77 for E and the last was 0.18 for RMSD. Furthermore, the accuracy trend was illustrated in table form and figures that the error of the accuracy is getting worse for example the R² for SO4 in 500m lag with 0.96 was become lesser in 1500m that is 0.69. For the E from 500m to 1500m, the value was lesser as well as RMSD was increased due to the distance. All in all, the objectives were accepted.
format	Undergraduates Project Papers
author	Ng, Zone Fhong
author_facet	Ng, Zone Fhong
author_sort	Ng, Zone Fhong
title	Evaluation of different semivariogram models in groundwater quality mapping using GIS-based simple kriging at Khorasan Razavi-Iran
title_short	Evaluation of different semivariogram models in groundwater quality mapping using GIS-based simple kriging at Khorasan Razavi-Iran
title_full	Evaluation of different semivariogram models in groundwater quality mapping using GIS-based simple kriging at Khorasan Razavi-Iran
title_fullStr	Evaluation of different semivariogram models in groundwater quality mapping using GIS-based simple kriging at Khorasan Razavi-Iran
title_full_unstemmed	Evaluation of different semivariogram models in groundwater quality mapping using GIS-based simple kriging at Khorasan Razavi-Iran
title_sort	evaluation of different semivariogram models in groundwater quality mapping using gis-based simple kriging at khorasan razavi-iran
publishDate	2015
url	http://umpir.ump.edu.my/id/eprint/12186/ http://umpir.ump.edu.my/id/eprint/12186/ http://umpir.ump.edu.my/id/eprint/12186/1/FKASA%20-%20NG%20ZONE%20FHONG%20%28CD9217%29.pdf http://umpir.ump.edu.my/id/eprint/12186/7/FKASA%20-%20NG%20ZONE%20FHONG%20%28CD9217%29%20-%20CHAP%201.pdf http://umpir.ump.edu.my/id/eprint/12186/10/FKASA%20-%20NG%20ZONE%20FHONG%20%28CD9217%29%20-%20CHAP%203.pdf
first_indexed	2023-09-18T22:13:34Z
last_indexed	2023-09-18T22:13:34Z
_version_	1777415187735773184

Evaluation of different semivariogram models in groundwater quality mapping using GIS-based simple kriging at Khorasan Razavi-Iran

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