Présentations Colloques

    Flash Poster
    8.04
    Session 8.04: Isotopic and residence time tracers
    Gorski (orateur)
    INFLUENCE OF LITHOLOGICAL AND HYDRODYNAMIC CONDITIONS ON GROUNDWATER QUALITY IN RIVER VALLEYS AND ICE MARGINAL VALLEYS
    In the valleys of big rivers and ice-marginal valleys are located aquifers that contain large groundwater resources in Poland. These waters are characterized, however, in some areas by very poor quality (high concentration of iron, manganese, ammonia nitrogen, COD and colour). Furthermore deterioration of groundwater quality during pumping is observed in these areas. In order to identify the occurrence of zones characterized by unfavorable geochemical environment the hydrochemical and hydrodynamic conditions were examined including determination of lateral and vertical variation of parameters. In addition geochemical tests of aquifer sediments focusing on organic matter, carbonates and sulfides were done. Performed research shown that the zones of low groundwater quality are located in the regions of the flood terraces, where a young Holocene sands containing dispersed organic matter of plant origin is deposited. Extremely bad geochemical conditions are observed, however, in those parts of the floodplains where the absence of hydrodynamic gradient cause lack of groundwater outflows. In areas where palneohydrogeological groundwater flow occurred, gradual improvement of water quality is observed as a result of leaching of the reactive organic matter. Studies have also shown that in such areas deterioration of groundwater quality may occur as a result of oxidation of organic matter and the associated sulfides. Process is being developed, above all in conditions of lowering the water table during pumping and leads to high concentrations of sulfate, iron, manganese and the total hardness in the water. The results indicate unsuitability of these zones to locate groundwater well fields. They also point to the need to provide detailed hydrochemical and hydrodynamic research during design and construction of the new groundwater captures located in the river valleys and ice-marginal valleys.
    Poland

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