Characterisation of potential pollution sources in the quantitative assessment of risk to groundwater resources within the Birmingham aquifers, UK
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2013, Vol 3, Issue 6
Abstract
This work presents a methodological approach where distribution of potential pollution sources and historical frequency of pollution incidents are included in the assessment of risk to groundwater resources. Calibrated flow and transport models were setup, and integrated with a FORTRAN coded risk model. The risk model was run to generate synthetic contaminant source terms that were subsequently transported by the coupled flow and transport models. The ranges of calibrated values obtained for horizontal and vertical hydraulic conductivities are 5.787x10-6- 2.315x10-5 m/s and 5.787x10-8- 1.157x10-7m/s, respectively. Layering within the aquifer is thought to account for the large vertical anisotropy. The corresponding values for the specific yield and specific storage are 0.10 - 0.12, and 1x10-4 - 5x10-4, respectively. The estimated historical frequency of pollution occurrence per stress period of 91 days is 35, while the probability of pollution occurring at any of the sources over a period of stress period is calculated as 0.0014. The generated risk maps provide anticipatory capability for risk quantification and show that approximately 55% of the monitoring boreholes have high (i.e. 70 – 100 %) likelihood of having contaminant concentration being less than 0.06 mg/l throughout the simulation
Authors and Affiliations
O. S. Oladeji
Keywords
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