Effectiveness evaluation of objective and subjective weighting methods for aquifer vulnerability assessment in urban context

Sahoo, M; Sahoo, S; Dhar, A; Pradhan, B

Effectiveness evaluation of objective and subjective weighting methods for aquifer vulnerability assessment in urban context

Sahoo, M Sahoo, S Dhar, A Pradhan, B

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Hydrology, 2016, 541, pp. 1303-1315
Issue Date:: 2016

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Field	Value	Language
dc.contributor.author	Sahoo, M
dc.contributor.author	Sahoo, S
dc.contributor.author	Dhar, A
dc.contributor.author	Pradhan, B https://orcid.org/0000-0001-9863-2054
dc.date.accessioned	2022-07-14T01:56:20Z
dc.date.available	2022-07-14T01:56:20Z
dc.date.issued	2016
dc.identifier.citation	Journal of Hydrology, 2016, 541, pp. 1303-1315
dc.identifier.issn	0022-1694
dc.identifier.issn	1879-2707
dc.identifier.uri	http://hdl.handle.net/10453/158886
dc.description.abstract	Groundwater vulnerability assessment has been an accepted practice to identify the zones with relatively increased potential for groundwater contamination. DRASTIC is the most popular secondary information-based vulnerability assessment approach. Original DRASTIC approach considers relative importance of features/sub-features based on subjective weighting/rating values. However variability of features at a smaller scale is not reflected in this subjective vulnerability assessment process. In contrast to the subjective approach, the objective weighting-based methods provide flexibility in weight assignment depending on the variation of the local system. However experts’ opinion is not directly considered in the objective weighting-based methods. Thus effectiveness of both subjective and objective weighting-based approaches needs to be evaluated. In the present study, three methods – Entropy information method (E-DRASTIC), Fuzzy pattern recognition method (F-DRASTIC) and Single parameter sensitivity analysis (SA-DRASTIC), were used to modify the weights of the original DRASTIC features to include local variability. Moreover, a grey incidence analysis was used to evaluate the relative performance of subjective (DRASTIC and SA-DRASTIC) and objective (E-DRASTIC and F-DRASTIC) weighting-based methods. The performance of the developed methodology was tested in an urban area of Kanpur City, India. Relative performance of the subjective and objective methods varies with the choice of water quality parameters. This methodology can be applied without/with suitable modification. These evaluations establish the potential applicability of the methodology for general vulnerability assessment in urban context.
dc.language	English
dc.publisher	Elsevier
dc.relation.ispartof	Journal of Hydrology
dc.relation.isbasedon	10.1016/j.jhydrol.2016.08.035
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Engineering
dc.title	Effectiveness evaluation of objective and subjective weighting methods for aquifer vulnerability assessment in urban context
dc.type	Journal Article
utslib.citation.volume	541
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CAMGIS - Centre for Advanced Modelling and Geospatial lnformation Systems
utslib.copyright.status	closed_access	*
dc.date.updated	2022-07-14T01:56:17Z
pubs.publication-status	Published
pubs.volume	541

Abstract:

Groundwater vulnerability assessment has been an accepted practice to identify the zones with relatively increased potential for groundwater contamination. DRASTIC is the most popular secondary information-based vulnerability assessment approach. Original DRASTIC approach considers relative importance of features/sub-features based on subjective weighting/rating values. However variability of features at a smaller scale is not reflected in this subjective vulnerability assessment process. In contrast to the subjective approach, the objective weighting-based methods provide flexibility in weight assignment depending on the variation of the local system. However experts’ opinion is not directly considered in the objective weighting-based methods. Thus effectiveness of both subjective and objective weighting-based approaches needs to be evaluated. In the present study, three methods – Entropy information method (E-DRASTIC), Fuzzy pattern recognition method (F-DRASTIC) and Single parameter sensitivity analysis (SA-DRASTIC), were used to modify the weights of the original DRASTIC features to include local variability. Moreover, a grey incidence analysis was used to evaluate the relative performance of subjective (DRASTIC and SA-DRASTIC) and objective (E-DRASTIC and F-DRASTIC) weighting-based methods. The performance of the developed methodology was tested in an urban area of Kanpur City, India. Relative performance of the subjective and objective methods varies with the choice of water quality parameters. This methodology can be applied without/with suitable modification. These evaluations establish the potential applicability of the methodology for general vulnerability assessment in urban context.

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http://hdl.handle.net/10453/158886