『Abstract
A groundwater vulnerability and risk mapping assessment, based
on a source-pathway-receptor approach, is presented for an urban
coastal aquifer in northeastern Brazil. A modified version of
the DRASTIC methodology was used to map the intrinsic and specific
groundwater vulnerability of a 292 km2 study area.
A fuzzy hierarchy methodology was adopted to evaluate the potential
contaminant source index, including diffuse and point sources.
Numerical modeling was performed for delineation of well capture
zones, using MODFLOW and MODPATH. The integration of these elements
provided the mechanism to assess groundwater pollution risks and
identify areas that must be prioritized in terms of groundwater
monitoring and restriction on use. A groundwater quality index
based on nitrate and chloride concentrations was calculated, which
had a positive correlation with the specific vulnerability index.
Keywords: Aquifer vulnerability; Groundwater contamination; Risk
assessment; Fuzzy logic』
1. Introduction
2. Study area
3. Methodology
3.1. Intrinsic Vulnerability Index (IVI)
3.2. Source Index (SI)
3.3. Well capture zone and receptor/Well Index (WI)
3.4. Risk Assessment Index (RI)
4. Testing the methodology
5. Sensitivity analysis
6. Conclusions
Acknowledgments
References