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Verification of Radiocarbon Transport Predicted by Numerical Modeling in the Porous Formation of NE Hungary Considering Paleo-Hydrogeology

Published online by Cambridge University Press:  24 July 2019

Ferenc Székely ,
József Deák ,
Péter Szűcs ,
László Kompár ,
Balázs Zákányi Open the ORCID record for Balázs Zákányi [Opens in a new window]  and
Mihály Molnár
Ferenc Székely
Affiliation:
University of Miskolc, Faculty of Earth Science and Engineering, Institute of Environmental Management, 3515 Miskolc-Egyetemváros, Hungary
József Deák
Affiliation:
GWIS Ltd., Hóvirág Street 9, Veszprém, 8200Hungary
Péter Szűcs
Affiliation:
University of Miskolc, Faculty of Earth Science and Engineering, Institute of Environmental Management, MTA-ME Geoengineering Research Group, 3515 Miskolc-Egyetemváros, Hungary
László Kompár
Affiliation:
University of Miskolc, Faculty of Earth Science and Engineering, Institute of Environmental Management, 3515 Miskolc-Egyetemváros, Hungary
Balázs Zákányi*
Affiliation:
University of Miskolc, Faculty of Earth Science and Engineering, Institute of Environmental Management, 3515 Miskolc-Egyetemváros, Hungary
Mihály Molnár
Affiliation:
Institute for Nuclear Research, Hungarian Academy of Sciences, Isotope Climatology and Environmental Research Centre, Bem square 18/c, Debrecen, 4026Hungary
*
*Corresponding author. Email: [email protected].
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Abstract

Verification of a groundwater flow model by radiocarbon (14C) data are presented taking into consideration the paleo-hydrogeological changes. Northeastern area of the Great Hungarian Plain was a deep-lying flat area, and its central part (Nyírség) has been uplifted in the last 15,000 years. These geological events have drastically changed the hydrogeological conditions of Nyírség. The groundwater flow system is composed of the Quaternary-Pliocene-Upper Pannonian clastic sediments. Groundwater flow modeling has been performed to define the main lateral and vertical flow directions and velocities controlling the propagation of the environmental radioactive tracer 14C. Solute-transport modeling was used to calculate the 14C activity. The recent steady-state groundwater flow velocity was reduced to a reasonable value characterizing the average flow velocity over the 15 ka simulation period using “trial and error” method. The best fit between the simulated and measured 14C data was achieved by assuming 0.4 flow velocity reduction factor. Results indicate that the present steady-state flow model with this flow velocity reduction factor is capable of reproducing the observed 14C data taking into account the effect of the significant uplift of the part of the land surface in the last 15 ka in NE Hungary.

Keywords

multi-layered aquiferNE Hungarynumerical verificationradiocarbonsolute-transport modeling
Type
Research Article
Information
Radiocarbon , Volume 62 , Issue 1 , February 2020 , pp. 219 - 233
Copyright
© 2019 by the Arizona Board of Regents on behalf of the University of Arizona 

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Footnotes

†

This article has been corrected since its original publication. See doi:10.1017/RDC.2019.128.

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