Automatic generation of groundwater model hydrostratigraphy from AEM resistivity and boreholes

Pernille Aabye Marker, N. Foged, A. V. Christiansen, Esben Auken, Peter Bauer-Gottwein

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Regional hydrological models are important tools in water resources management. Model prediction uncertainty is primarily due to structural (geological) non-uniqueness which makes sampling of the structural model space necessary to estimate prediction uncertainties. Geological structures and heterogeneity, which spatially scarce borehole lithology data may overlook, are well resolved in AEM surveys. This study presents a semi-automatic sequential hydrogeophysical inversion method for the integration of AEM and borehole data into regional groundwater models in sedimentary areas, where sand/ clay distribution govern groundwater flow. The coupling between hydrological and geophysical parameters is managed using a translator function with spatially variable parameters followed by a 3D zonation. The translator function translates geophysical resistivities into clay fractions and is calibrated with observed lithological data. Principal components are computed for the translated clay fractions and geophysical resistivities. Zonation is carried out by k-means clustering on the principal components. The hydraulic parameters of the zones are determined in a hydrological model calibration using head and discharge observations. The method was applied to field data collected at a Danish field site. Our results show that a competitive hydrological model can be constructed from the AEM dataset using the automatic procedure outlined above.
Original languageEnglish
Title of host publicationNear Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics
PublisherEuropean Association of Geoscientists and Engineers
Publication date2014
ISBN (Print)9789462820272
Publication statusPublished - 2014
Event20th European Meeting of Environmental and Engineering Geophysics - Athens, Greece
Duration: 14 Sep 201418 Sep 2014
Conference number: 20

Conference

Conference20th European Meeting of Environmental and Engineering Geophysics
Number20
CountryGreece
CityAthens
Period14/09/201418/09/2014

Cite this

Marker, P. A., Foged, N., Christiansen, A. V., Auken, E., & Bauer-Gottwein, P. (2014). Automatic generation of groundwater model hydrostratigraphy from AEM resistivity and boreholes. In Near Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics European Association of Geoscientists and Engineers.