Groundwater Vulnerability to Nitrate Contamination from Fertilizers Using Modified DRASTIC Frameworks
Torkashvand, Maryam ; Neshat, Aminreza ; Javadi, Saman ; Yousefi, Hossein and Berndtsson, Ronny LU
(2023)
In Water (Switzerland)
15(17).
- Abstract
Vulnerability maps of groundwater provide an efficient means of identifying environmental trends and prioritizing regions for prevention plans. The GIS-based DRASTIC method, however, does not consider the impact of contamination, so there is a need to modify it according to the specifics of the region and its contamination load. The aim of this study is to investigate a suitable DRASTIC modification for vulnerability assessment by changes in its rating and weighting systems. The goal is to explore and compare the impact of both objective and subjective weighting methods in the vulnerability assessment of a smaller aquifer situated beneath agricultural land. The frequency ratio (FR) method is used to adjust the DRASTIC index rates based... (More)
Vulnerability maps of groundwater provide an efficient means of identifying environmental trends and prioritizing regions for prevention plans. The GIS-based DRASTIC method, however, does not consider the impact of contamination, so there is a need to modify it according to the specifics of the region and its contamination load. The aim of this study is to investigate a suitable DRASTIC modification for vulnerability assessment by changes in its rating and weighting systems. The goal is to explore and compare the impact of both objective and subjective weighting methods in the vulnerability assessment of a smaller aquifer situated beneath agricultural land. The frequency ratio (FR) method is used to adjust the DRASTIC index rates based on nitrate contamination as the main contamination from fertilizers extensively used in the study area. The DRASTIC parameters’ weights are determined using two objective and subjective methods, including Shannon entropy and single-parameter sensitivity analysis (SPSA), respectively. In total, five frameworks, including FR-DRASTIC, DRASTIC-Entropy, DRASTIC-SPSA, FR-SPSA, and FR-Entropy are developed and evaluated. We validate these proposed vulnerability indices based on the nitrate concentrations in 14 samples. The results show that the vulnerability map obtained from the FR-Entropy framework is superior, showing a 0.85 correlation with nitrate concentrations. Notably, Shannon entropy as an objective weighting method outperformed the subjective SPSA approach.
(Less)
- author
- Torkashvand, Maryam
; Neshat, Aminreza
; Javadi, Saman
; Yousefi, Hossein
and Berndtsson, Ronny
LU
- organization
- publishing date
- 2023-09
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- DRASTIC, entropy, frequency ratio, GIS, nitrate, single-parameter sensitivity analysis
- in
- Water (Switzerland)
- volume
- 15
- issue
- 17
- article number
- 3134
- publisher
- MDPI AG
- external identifiers
-
- scopus:85170382586
- ISSN
- 2073-4441
- DOI
- 10.3390/w15173134
- language
- English
- LU publication?
- yes
- additional info
- Funding Information: We acknowledge the support from the Strategic Research Area: The Middle East in the Contemporary World (MECW) at the Centre for Advanced Middle Eastern Studies, Lund University, Sweden. Publisher Copyright: © 2023 by the authors.
- id
- 12ecf5e7-e259-4885-b915-6736d36cffc9
- date added to LUP
- 2023-09-25 12:17:07
- date last changed
- 2023-09-28 02:48:14
@article{12ecf5e7-e259-4885-b915-6736d36cffc9,
abstract = {{<p>Vulnerability maps of groundwater provide an efficient means of identifying environmental trends and prioritizing regions for prevention plans. The GIS-based DRASTIC method, however, does not consider the impact of contamination, so there is a need to modify it according to the specifics of the region and its contamination load. The aim of this study is to investigate a suitable DRASTIC modification for vulnerability assessment by changes in its rating and weighting systems. The goal is to explore and compare the impact of both objective and subjective weighting methods in the vulnerability assessment of a smaller aquifer situated beneath agricultural land. The frequency ratio (FR) method is used to adjust the DRASTIC index rates based on nitrate contamination as the main contamination from fertilizers extensively used in the study area. The DRASTIC parameters’ weights are determined using two objective and subjective methods, including Shannon entropy and single-parameter sensitivity analysis (SPSA), respectively. In total, five frameworks, including FR-DRASTIC, DRASTIC-Entropy, DRASTIC-SPSA, FR-SPSA, and FR-Entropy are developed and evaluated. We validate these proposed vulnerability indices based on the nitrate concentrations in 14 samples. The results show that the vulnerability map obtained from the FR-Entropy framework is superior, showing a 0.85 correlation with nitrate concentrations. Notably, Shannon entropy as an objective weighting method outperformed the subjective SPSA approach.</p>}},
author = {{Torkashvand, Maryam and Neshat, Aminreza and Javadi, Saman and Yousefi, Hossein and Berndtsson, Ronny}},
issn = {{2073-4441}},
keywords = {{DRASTIC; entropy; frequency ratio; GIS; nitrate; single-parameter sensitivity analysis}},
language = {{eng}},
number = {{17}},
publisher = {{MDPI AG}},
series = {{Water (Switzerland)}},
title = {{Groundwater Vulnerability to Nitrate Contamination from Fertilizers Using Modified DRASTIC Frameworks}},
url = {{http://dx.doi.org/10.3390/w15173134}},
doi = {{10.3390/w15173134}},
volume = {{15}},
year = {{2023}},
}