Hydrogeochemische Hintergrundwerte der Grundwässer Deutschlands als Web Map Service | A web map service for background groundwater chemistry in Germany
2011
Wagner, Bernhard | Walter, Thomas | Himmelsbach, Thomas | Clos, Patrick | Beer, Antje | Budziak, Dörte | Dreher, Thomas | Fritsche, Hans-Gerhard | Hübschmann, Mathias | Marczinek, Silke | Peters, Annett | Poeser, Heidrun | Schuster, Hannsjörg | Steinel, Anke | Wagner, Frank | Wirsing, Gunther
One of the main objectives of the EC water framework directive is to ensure good chemical status for all groundwater bodies. For this reason the geological surveys of Germany have produced a nationwide map of the background values of groundwater. Only naturally occurring inorganic parameters were taken into account, including the relevant major and trace elements. Based on the hydrogeological map of Germany at the scale of 1:200,000 (HÃK 200), and its delimited hydrogeological regions, a total of 186 hydrogeochemical units were defined and mapped geochemically. This involved collection of more than 52,000 groundwater samples in a database and allocation to their appropriate hydrogeochemical units. In order to separate anomalies within the data-sets from the underlying normal population, probability nets were used as a statistical tool. The procedure allowed to determine the normal populations of the investigated parameters within the hydrogeochemical units and to quantify them in the form of percentiles. The resulting hydrogeochemical background values are accessible through an internet web map service that includes an online map application. The main intention of this technical note is to inform the reader about the existing internet service, which necessitates some web-site content duplication.
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