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Numerical model schematization of a complex hydrostructural Cretaceous groundwater basin for the purpose of protection zone evaluation

Gurwin J.

Geology, Geophysics and Environment

2017

Vol. 43, no. 1

19--31

One of the major projects in regional hydrogeological investigations in Poland is a multi-annual cycle of studies on the implementation of programs and documentation in relation to the establishment of protection areas for the Major Groundwater Basins (MGBs). Depending on the size of the area and complexity of the selected aquifer system, the work on the numerical model becomes adequately demanding. The model must in this case be designed as a three-dimensional, multi-layered, taking into account the role of a near the surface aquifer in the potential rate of migration of contaminants. It is particularly difficult to design models of the basins located in the older Mesozoic hydrogeological structures of dual-porosity characteristic, covered by Neogenic and Quaternary sediments. One of these basins is MGB No. 317 (ed. Kleczkowski 1990) identified within the northern Sudetic trough. The boundaries of the MGB are associated with the occurrence of structural aquifer limits, including the relatively large area of outcrops of the upper Cretaceous sediments with a narrow zone of Triassic outcrops. The paper presents the main assumptions of the model schematization, especially regarding the parameterization of hydrostructural conditions in integration with geoinformatic tools and MODFLOW modules. This study is focused on the problems associated with the proper schematization of the multilayer groundwater system on a regional scale, particularly with regard to the first aquifer and its hydraulic contact with the Mesozoic water-bearing horizons of the MGB. Model simulations, together with a semi-analytical analysis of the rate of flow in the vadose zone, finally allowed to determine the protection area of the MGB that is presented.

Propozycja wyodrębnienia nowych zbiorników w strukturach wodonośnych plejstocenu i paleogenu w rejonie Trójmiasta

Lidzbarski M., Pasierowska M.

Biuletyn Państwowego Instytutu Geologicznego

2013

nr 456 Hydrogeologia z. 14/1

355--361

W artykule przedstawiono wstępną charakterystykę hydrogeologiczną nowych struktur wodonośnych spełniających kryteria GZWP, które zostały zidentyfikowane w rejonie Trójmiasta w osadach wodonośnych plejstocenu, neogenu i paleogenu. Omówiono układ hydrostrukturalny tych zbiorników oraz wskazano na pozycję hydrodynamiczną w systemie krążenia wód podziemnych. Dla każdego zbiornika podano parametry hydrogeologiczne poziomów wodonośnych (miąższość, wydajność potencjalną otworu studziennego, przewodność). Wstępnie oceniono zasobność każdej struktury i jej znaczenie dla zaopatrzenia aglomeracji Trójmiasta.

The paper presents an initial characterisation of new hydrogeological structures fulfilling the criteria for the Major Groundwater Basin identified in the Tricity region in Pleistocene, Neogene and Paleogene sediments. The hydrostructural system is discussed and the hydrodynamic position in the groundwater circulation system is indicated. For each structure, hydrogeological parameters of aquifers have been specified: thickness, potential discharge of a well and transmissivity. Groundwater resources have been estimated for each hydrogeological structure and the usefulness for water management have been assessed.