Application of numerical simulation system on Turonian aquifer remediation control
This contribution presents the simulation system SATURN_2001, developed for the purpose of optimized management of remediation extraction from Turonian aquifer in Straz pod Ralskem region. The numerical model including the effect of dual porosity is used
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stract. This contribution presents the simulation system SATURN_ 200 1, de-
veloped for the purpose of optimized management of remediation extraction from Turonian aquifer in Straz pod Ralskem region. The numerical model including the effect of dual porosity is used for modeling of reactive transport of contaminants. The model has been calibrated by utilizing data from VP-9C area. Application of the system is presented by one of the solved remediation variant.
lntroduction The drinking water sources for Northbohemian region lie in Turonian aquifer, part of the Czech Cretaceous Table. Due to chemical mining of uranium in Straz block the underlying Cenomanian aquifer was polluted. In spite of a 60 m thick aquitard between Cenomanian and Turonian aquifers 0.5 % of contamination migrated from the Cenomanian to the Turonian aquifer. This represents approximately 30 000 tons of dissolved solids. The contamination is characterized by isolated plums with concentration ofTDS from 5 to 30 g/1. Remediation is performed in the form of abstraction of the contamination from the ground and the polluted water is cleaned by membrane technologies, neutralized or directly discharged to rivers (only very slightly contaminated water). To evaluate the underground situation numerical models describing groundwater flow and contaminant transport taking into account dual porosity were developed. The models were calibrated using the data from monitoring. The optimizing software tool SATURN was developed to model the processes Controlling the remediation.
• This work was supported by grant No. GACR 205/0l/P047
B. J. Merkel et al. (eds.), Uranium in the Aquatic Environment © Springer-Verlag Berlin Heidelberg 2002
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Hana Cerrruikova et al.
Groundwater flow and contaminant transport model with dual porosity By "dual porosity" we express that rock matrix is divided into two pore volumes, active and inactive. The inactive pores are filled with solution but the velocity of flow in this pores is neglect able compared to the velocity in active pores. Let us denote na- active porosity, ns- inactive porosity and n- total porosity (n = na + ns)· The transport of the contaminants is driven by the following aspects: advection and dispersion in active pores and diffusion exchange between active and inactive pores (fig. 1).
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