Detailed 3D geological modelling at a contaminated stream using geophysical, geological and chemical data-A challenge

I. Moeller, P. K. Maurya, G. Fiandaca, N. Balbarini, V. Rønde, A. J. Kallesøe

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingspeer-review

Abstract

Localizing sources of contaminated groundwater discharging to streams may be a challenging task. A detailed geological model of the site is required for simulating the groundwater flow and the contaminant transport, in addition to chemical and hydrological investigations. In the town of Grindsted, Denmark, contaminated groundwater discharges to a stream. Several contaminated sites are present in the area, where chemical waste from a nearby chemical factory was deposited. In order to understand the hydrological flow and transport of contaminants controlled by a few mostly continuous clay and lignite layers in an otherwise sandy environment, a detailed 3D geological model is constructed. The model integrates all available data including DCIP and EMI surveys, lithological logs from new and existing wells, hydraulic head and pore water electric conductivity data. This study addresses the challenges met while constructing the 3D geological model in an area, where inorganic contaminants are highly affecting the geophysical data. The model ambiguities related to interpretation of clay layers versus contaminated sand layers in the DCIP resistivity sections as well as resistivity/chargeability-thickness equivalences are managed by integrated interpretation of a large amount of different geophysical, geological, hydraulic and chemical data.

Original languageEnglish
Title of host publication23rd European Meeting of Environmental and Engineering Geophysics
PublisherEuropean Association of Geoscientists and Engineers, EAGE
ISBN (Electronic)9789462822238
Publication statusPublished - 2017
Event23rd European Meeting of Environmental and Engineering Geophysics - Malmo, Sweden
Duration: 3 Sep 20177 Sep 2017

Publication series

Name23rd European Meeting of Environmental and Engineering Geophysics

Conference

Conference23rd European Meeting of Environmental and Engineering Geophysics
Country/TerritorySweden
CityMalmo
Period3/09/177/09/17

Programme Area

  • Programme Area 2: Water Resources

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