Automatic generation of groundwater model hydrostratigraphy from AEM resistivity and boreholes

P. A. Marker, N. Foged, A.V. Christiansen, E. Auken, P. Bauer-Gottwein

Publikation: Bidrag til bog/rapport/konferenceproceedingsKonferenceartikel i proceedingspeer review

1 Citationer (Scopus)

Abstrakt

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.

OriginalsprogEngelsk
TitelNear Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics
ForlagEuropean Association of Geoscientists and Engineers, EAGE
ISBN (Elektronisk)9789462820272
DOI
StatusUdgivet - 2014
Udgivet eksterntJa
Begivenhed20th European Meeting of Environmental and Engineering Geophysics of EAGE's Near Surface Geoscience Division - Athens, Grækenland
Varighed: 14 sep. 201418 sep. 2014

Publikationsserier

NavnNear Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics

Konference

Konference20th European Meeting of Environmental and Engineering Geophysics of EAGE's Near Surface Geoscience Division
Land/OmrådeGrækenland
ByAthens
Periode14/09/1418/09/14

Programområde

  • Programområde 2: Vandressourcer

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