Hydrogeologie, Hydrogeochemie und Isotopie der Grund- und Grubenwässer im Einzugsgebiet des Burgfeyer Stollens bei Mechernich/Eifel
This paper gives an overview of the hydrogeochemical and hydrogeological situation in the catchment area of the Burgfeyer Stollen and the old abandoned mining area at the southern part of the Mechernicher Triasbucht. The Burgfeyer Stollen with its length of 7,5 km nowadays is the main base of drainage in this area. It causes a reverse of the original groundwater flow towards S and SE and a strong drawdown of the ground water level in the vicinity of the old mine site. The outflow is about 300 l/s, which is mainly derived from: 1. the western part of its catchment (Westfeld) which is connected to the Sötenicher Kalkmulde. 2. the aquifer of the bunter sandstone. Hydrochemical analyses and investigations of environmental isotopes (d34S, d13C, d2H, d18O, d15N, 3H) and trace gases (CFC) of the upper and middle bunter sandstone groundwaters and of the mine waters have been performed in order derive a genetic model for the outflow waters of the Burgfeyer Stollen and identify the main chemical and mixing processes. Combining the ground water flow situation with the age structure and the hydrochemical and isotopic signatures of the groundwater outside the mining area the influences of the Mechernich waste disposal site ZMM (Zentrale Mülldeponie Mechernich) on the subsurface waters were discussed. On the basis of the water chemistry, the sulfur and carbon isotopes, stable isotopes and the tritium content of the samples a significant influence of the waste disposal on the ground and mine water could not be observed. Although some of the sulfur isotope signatures of the ground water samples may show an anthropogenic background caused by atmospheric deposition and fertilizers, most of the sulfur isotope data can be explained by geogenic processes - depleted delta-values caused by the oxidation of sulfide ores and enriched signatures caused by sulfate reduction. The ground waters of the shallow and intermediate flow system in the upper bunter sandstone show residence times of less than 47 years. In the deep confined circulation system of the middle bunter sandstone the turnover time and the flow velocities are lower. Derived from tritium and CFC data the residence times of the ground waters in the middle bunter sandstone aquifer, away from the recharge area, are more than 47 years (recharge before 1953). These ground waters in general contain no tritium and CFC. Due to the drawdown of the groundwater in the mining area, some samples show little to significant amounts of dating tracers caused by a mixing component resulting by a vertical flow from the shallow ground water circulation systems.
info:eu-repo/classification/ddc/550, Mechernicher Voreifel, Erzbergbau, Einzugsgebiet, Grubenwasser, Hydrogeologie, Hydrogeochemie, Geowissenschaften, Burgfeyer Stollen, Mechernich, Bleiberg, Mechernicher Triasbucht, Isotopenhydrologie, Hydrochemie, Buntsandstein
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