A method to estimate ground water pollution vulnerability: the Glenelg Hopkins catchment
Ground Floor Event Space
333 Exhibition Street
PhD Completion Seminar by Adrian Ixcoatl Cervantes Servin
It is imperative to be able to estimate seasonal pollution vulnerability that accounts for climatic variability effects on the aquifer. Other researchers have used DRASTIC-based models to estimate a steady state groundwater vulnerability, but the effects of temporal variations on the vulnerability has not accounted for in these models. In this study, we developed a new method for estimating seasonal groundwater vulnerability based on a modified pesticide DRASTICL model. The vulnerability was calculated by implementing a correspondence analysis for two variable groups: the static and the dynamic. The dynamic group comprised of depth (D) and recharge (R) and the static group comprised of aquifer media (A), soil (S), topography slope (T), impact of vadose zone (I), aquifer conductivity (C) and land use (L).
The study site selected was the Glenelg Hopkins catchment in Victoria, Australia. Our groundwater vulnerability model was able to differentiate four seasonal vulnerability scores. Seasonal estimations fluctuated from a scale bounded from 42.48 to 205.2 in winter and from 32.32 to 159.80 in summer where scales are non-dimensional. Our results suggest that the seasonal groundwater vulnerability model provides a robust yet flexible method for investigating changes in groundwater vulnerability in agricultural areas, DRASTICL.
Adrian Ixcoatl Cervantes Servin , PhD candidate