Helicopter-borne electromagnetics (HEM) at the Elbe estuary in Northern Germany

Autor: Steuer, A., Siemon, B., Ibs-von Seht, M., Meyer, U., Wiederhold, H.
Jazyk: angličtina
Rok vydání: 2011
Zdroj: Protokoll über das 24. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung
Popis: Helicopter-borne electromagnetic investigations provide a high potential for a comprehensive mapping of the upper hundred metres of the subsurface. The relevance for hydrogeological questions is given by the determination of resistivity models for revealing the distribution of sandy and clayey as well as saltwater and freshwater saturated sediments. The survey area to the north-west of the City of Hamburg covers the estuary of the Elbe river. Here, the aquifers and their potential salinization were intended to be mapped. Parts of the results of this survey area are involved in the project KLIMZUG-NORD, in which the Technical University Hamburg-Harburg investigates the environmental effects of climate change on the estuary of the Elbe river. Due to current climate change scenarios a sea level rise in the North-Sea region is predicted and, consequently, the water level of the Elbe river will rise in an area affected by a changing sea level. That entails an intrusion of brackish water into the surrounding freshwater aquifers. Such scenarios are investigated by hydraulic flow models. Existing geological information will be complemented spatially by electrical resistivity models derived from HEM data to a geological structural model. This will be related to hydrological parameters and should therefore serve as a base for a hydraulic modelling.
Databáze: OpenAIRE
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