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Groundwater table fluctuations in the direct catchment of Goczałkowice reservoir - results of quantitative monitoring

Czekaj J., Kozioł K.

Geology, Geophysics and Environment

2012

Vol. 38, no. 4

458

Implementation of the Water Framework Directive (WFD) drew more attention to a problem of water quality and depended ecosystems. The strategic research project Integrated system supporting management and protection of dammed reservoir (ZiZoZap) which is being recently realized for Goczałkowice reservoir fulfils the mention problem. One of the important tasks of the ZiZOZap project is assessment of the groundwater-surface water interaction from both qualitative and quantitative point of view. For solving of these problems the large scale groundwater monitoring network (55 private well and 22, mainly nested, monitoring wells) has been organized within the area of direct catchment of Goczałkowice reservoir (southern Poland). Main task of quantitative monitoring is: to identify hydrogeological conditions of the upper Quaternary aquifer in the research area, to evaluate of groundwater reaction on outer impact of such factors as precipitation and surface water level in dammed reservoir, thus, the groundwater-surface water interaction. Groundwater table level monitoring has been carrying on since May 2011 with monthly frequency. Since July 2012 constant monitoring of groundwater level and temperature has been carrying on. Five data loggers (divers) with integrated pressure probe were installed in selected monitoring wells. Four divers have been installed in nested monitoring wells situated along the groundwater pathway at southern experimental site called Zarzecze Pumping Station. Installed divers conveniently and automatically collect groundwater level and temperature data every hour. Till the end of December 2012 the data base contained over 20,000 records. Long-term research shows large diversity of groundwater fluctuation in monitoring points. Maximum amplitude of groundwater fluctuation comes to 2.5 m in the northern side of the catchment. Groundwater fluctuations are lower in direct proximity of reservoir.