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Simulation of contamination transport for contamination risk assessment


, : Simulation of contamination transport for contamination risk assessment. IAHS-AISH Publication 341: 172-178

Former disposal fields are considered now as new building construction areas in Moscow. Investigations show that the unsaturated zone under disposal fields was contaminated by heavy metals, nitrogen and organic compounds. No detailed work on groundwater contamination has been done. A stochastic-deterministic approach used for groundwater risk contamination assessment for a case without reliable information about the groundwater contamination is presented in this paper. The deterministic models include contaminant transport in the unsaturated zone and groundwater. The stochastic elements relate to "lithological" or "hydrogeological" windows in the aquitard which separates the upper contaminated aquifer and the lower target aquifer which is important for groundwater supply. Unsaturated flow and transport modelling was performed with WHI UnSat Suite Plus. Groundwater flow and contaminant transport were modelled using MODFLOW/MT3DMS codes. Stochastic conditional simulation was performed with the SISIM code of the GSLIB library. Results of the multiple forecasts have allowed estimation of the high probability of groundwater pollution of the target aquifer due to leakage from the upper aquifer through "lithological" windows in the aquitard.

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