Preprints
https://doi.org/10.5194/hessd-12-4191-2015
https://doi.org/10.5194/hessd-12-4191-2015

  24 Apr 2015

24 Apr 2015

Review status: this preprint was under review for the journal HESS but the revision was not accepted.

Updating hydraulic properties and layer thicknesses in hydrogeological models using groundwater model calibration results

A. Lourens1, M. F. P. Bierkens1,2, and F. C. van Geer1,3 A. Lourens et al.
  • 1Department of Physical Geography, Faculty of Geosciences, Utrecht University, Heidelberglaan 2, 3584 CS Utrecht, the Netherlands
  • 2Unit Subsurface and Groundwater Systems, Deltares, Princetonlaan 6, 3584 CB Utrecht, the Netherlands
  • 3TNO Geological Survey of the Netherlands, Princetonlaan 6, 3584 CB Utrecht, the Netherlands

Abstract. Usually, subsoil data for groundwater models are generated from borehole data, using upscaling techniques. Since the assumed hydraulic properties for litho-classes in boreholes are uncertain, and upscaling may add inaccuracies, the groundwater model has to be calibrated. In this paper, a method is presented that uses a calibrated groundwater model to improve the quality of a hydrogeological model (layer thickness and hydraulic properties) as obtained from borehole data. To achieve this, all borehole data are defined by random variables and related to aquifer and aquitard properties at the same support as the groundwater model, using complete probability density functions. Subsequently, the calibrated parameter values of the groundwater model are assumed to be the truth and are used to find the most likely combination of layer thicknesses and hydraulic conductivities for the lithological layers making up the aquifer or aquitard. The presented example is an application of the proposed method to aquitards. Nevertheless, the method can be applied to aquifers as well. The analysis of the results gives rise to the discussion about the correctness of the hydrogeological interpretation of the borehole data as well as the correctness of the calibration results of the groundwater flow model. In order to make the problem tractable, computationally feasible, and avoid assumptions about the distribution form, piecewise linear probability density functions are used, instead of parametrized functions.

A. Lourens et al.

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

A. Lourens et al.

A. Lourens et al.

Viewed

Total article views: 895 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
563 280 52 895 61 78
  • HTML: 563
  • PDF: 280
  • XML: 52
  • Total: 895
  • BibTeX: 61
  • EndNote: 78
Views and downloads (calculated since 24 Apr 2015)
Cumulative views and downloads (calculated since 24 Apr 2015)

Saved

Latest update: 21 Jan 2022
Download
Short summary
We present a method to find the most likely properties (layer thickness and conductivity) for each litho-class of the constituting layers of an aquitard, using a readily calibrated groundwater model. The prior litho-class properties are uncertain, and based on borehole data. The groundwater model parameters are assumed to be the truth. The combination of prior data and calibration result yields the most likely litho-class properties. The method is applicable to aquifers as well.