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HYDROGEOLOGICAL CONDITIONS IN THE AREA OF MUNICIPAL LANDFILL BASED ON MODELLING STUDIES, SOUTHERN POLAND

Sławomir Sitek

Abstract

To assess the hydrogeological conditions and indicate the major components of the water balance in the landfill area, located in the border of the city Tychy, southern Poland, a modeling investigation was applied. Groundwater flow model on the local scale for steady-state conditions for the year 2016 was created in FEFLOW environment, ver. 7.0. Modeled unconfined Quaternary aquifer was calibrated against hydraulic head measurements from 18 observation wells, 10 of them surrounded the old site of a municipal landfill. The old site of the landfill opposite to two others in used has neither any bottom liner nor any leachate treatment system, as a result the leachate generated from the landfill can pose a hazard for the quality of groundwater and, deplete quantity of groundwater resources. Modeling results indicate that the bottom of the landfill is below the water table only in the northern part. However, the predictive scenario for a very wet year (occurred in 2010) shows that increased recharge cause the rise of the water table above the bottom of the entire old landfill. The major direction of groundwater flow is from N to S in the vicinity of the landfill, toward the River Gostynia, which is the base of drainage for the modeled area. The study area is recharged by precipitation in over 98%. By means of particle tracking method, the estimated outflow of water from the old landfill site to Gostynia river varies from a few years in the southern part to over 40 years in the northern part.

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DOI resolver: doi.org/10.5593/sgem2019/1.2/s02.041

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