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Application of MODFLOW for simulating groundwater flow in the Trifilia karst aquifer, Greece

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Abstract

Karst aquifers can have a complex flow as a result of the formation of large conduits from dissolution features. As a result, a three-dimensional finite-difference groundwater flow model (equivalent porous media) may not apply as the dual porosity nature of karst features and the effects of turbulent flow cannot be directly simulated. Statistical analysis of karst hydrographs of the Trifilia aquifer in Greece showed the existence of a slightly karstified mass with high primary porosity that regulates the flow. An equivalent porous media model was developed to simulate the Trifilia karst aquifer using MODFLOW. Steady state and transient state calibration gave encouraging results for the equivalent porous media approach, which does not consider pipe flow or turbulence. Detailed hydrogeological research conducted in the area helped define the aquifer hydraulic conductivity zones and extent; and flux to/from the aquifer. Only hydraulic conductivity and specific yield were adjusted during calibration, as the flux to/from the system was considered known and applied as boundary conditions. Small mean absolute and RMS piezometric head error of the model under both steady and transient state conditions were achieved.

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  1. Department of Mechanical and Water Resources Engineering, Technological Educational Institute of Messolonghi, Nea Ktiria, 30200, Messolonghi, Greece

    Georgios Panagopoulos

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  1. Georgios Panagopoulos
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Correspondence to Georgios Panagopoulos.

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Panagopoulos, G. Application of MODFLOW for simulating groundwater flow in the Trifilia karst aquifer, Greece. Environ Earth Sci 67, 1877–1889 (2012). https://doi.org/10.1007/s12665-012-1630-2

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