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dc.contributor.authorSORICHETTA ALESSANDROen_GB
dc.contributor.authorBALLABIO CRISTIANOen_GB
dc.contributor.authorMASETTI Marcoen_GB
dc.contributor.authorROBINSON, JR. Gilpin R.en_GB
dc.contributor.authorSTERLACCHINI Simoneen_GB
dc.identifier.citationGROUND WATER vol. 51 no. 6 p. 866–879en_GB
dc.description.abstractIncreasing availability of geo-environmental data has promoted the use of statistical methods to assess groundwater vulnerability. Nitrate is a widespread anthropogenic contaminant in groundwater and its occurrence can be used to identify aquifer settings vulnerable to contamination. In this study, multivariate Weights of Evidence (WofE) and Logistic Regression (LR) methods, where the response variable is binary, were used to evaluate the role and importance of a number of explanatory variables associated with nitrate sources and occurrence in groundwater in the Milan District (central part of the Po Plain, Italy). The results of these models have been used to map the spatial variation of groundwater vulnerability to nitrate in the region, and we compare the similarities and differences of their spatial patterns and associated explanatory variables. We modify the standard WofE method used in previous groundwater vulnerability studies to a form analogous to that used in LR; this provides a framework to compare the results of both models and reduces the effect of sampling bias on the results of the standard WofE model. In addition, a non-linear Generalized Additive Model has been used to extend the LR analysis. Both approaches improved discrimination of the standard WofE and LR models, as measured by the c-statistic. Groundwater vulnerability probability outputs, based on rank-order classification of the respective model results, were similar in spatial patterns and identified similar strong explanatory variables associated with nitrate source (population density as a proxy for sewage systems and septic sources) and nitrate occurrence (groundwater depth).en_GB
dc.description.sponsorshipJRC.H.6-Digital Earth and Reference Dataen_GB
dc.titleA Comparison of Data-Driven Groundwater Vulnerability Assessment Methodsen_GB
dc.typeArticles in periodicals and booksen_GB
JRC Directorate:Sustainable Resources

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