Hydrogeophysical Case Studies at the Local Scale: The Saturated Zone

Hyndman, D. W.; Tronicke, Jens

doi:10.1007/1-4020-3102-5_13

Cited by 24 publications

(19 citation statements)

References 65 publications

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“…In general, petrophysical relationships are difficult to establish because such translation tends to be site-, scale-and facies-specific (Chen et al, 2001;Hyndman and Tronicke, 2005;Slater, 2007) and uncertain (Mazáč et al, 1985;Slater, 2007). The studies by Herckenrath et al (2013) and Christensen et al (2016) used a fixed petrophysical relationship throughout the model domain.…”

Section: Introductionmentioning

confidence: 99%

Voxel inversion of airborne electromagnetic data for improved groundwater model construction and prediction accuracy

Christensen

Ferré

Fiandaca

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. We present a workflow for efficient construction and calibration of large-scale groundwater models that includes the integration of airborne electromagnetic (AEM) data and hydrological data. In the first step, the AEM data are inverted to form a 3-D geophysical model. In the second step, the 3-D geophysical model is translated, using a spatially dependent petrophysical relationship, to form a 3-D hydraulic conductivity distribution. The geophysical models and the hydrological data are used to estimate spatially distributed petrophysical shape factors. The shape factors primarily work as translators between resistivity and hydraulic conductivity, but they can also compensate for structural defects in the geophysical model.The method is demonstrated for a synthetic case study with sharp transitions among various types of deposits. Besides demonstrating the methodology, we demonstrate the importance of using geophysical regularization constraints that conform well to the depositional environment. This is done by inverting the AEM data using either smoothness (smooth) constraints or minimum gradient support (sharp) constraints, where the use of sharp constraints conforms best to the environment. The dependency on AEM data quality is also tested by inverting the geophysical model using data corrupted with four different levels of background noise. Subsequently, the geophysical models are used to construct competing groundwater models for which the shape factors are calibrated. The performance of each groundwater model is tested with respect to four types of prediction that are beyond the calibration base: a pumping well's recharge area and groundwater age, respectively, are predicted by applying the same stress as for the hydrologic model calibration; and head and stream discharge are predicted for a different stress situation.As expected, in this case the predictive capability of a groundwater model is better when it is based on a sharp geophysical model instead of a smoothness constraint. This is true for predictions of recharge area, head change, and stream discharge, while we find no improvement for prediction of groundwater age. Furthermore, we show that the model prediction accuracy improves with AEM data quality for predictions of recharge area, head change, and stream discharge, while there appears to be no accuracy improvement for the prediction of groundwater age.

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Section: Introductionmentioning

confidence: 99%

Voxel inversion of airborne electromagnetic data for improved groundwater model construction and prediction accuracy

Christensen

Ferré

Fiandaca

et al. 2017

Hydrol. Earth Syst. Sci.

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“…Utilizing this knowledge is fundamental to achieve a geologically plausible description of heterogeneity, to delineate ranges of high-conductivity zones and for consistent re-interpretation of geophysical data (Stanford and Ashley, 1998;Asprion and Aigner, 1999;Hyndman and Tronicke, 2005;Iversen et al, 2008). Inclusion of such information in hydrogeological model calibration prevents non-realistic realizations of spatial hydraulic parameter distribution and exploits complementary knowledge to reduce ill-posedness of (geostatistical) inversion problems (Chen and Rubin, 2003;Maier et al, 2009;Dafflon et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional high resolution fluvio-glacial aquifer analog: Part 1: Field study

Bayer

Huggenberger

Renard

et al. 2011

Journal of Hydrology

100

106

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s u m m a r yDescribing the complex structures that exist in many sedimentary aquifers is crucial for reliable groundwater flow and transport simulation. However, hardly any aquifer can be inspected in such detail that all decimeter to meter heterogeneity is resolved. Aquifer analogs serve as surrogates to construct models of equivalent heterogeneity, and thus imitate those features relevant for flow or transport processes. Gravel pits found in excavation show excellent sections of the sedimentary sequence and thus offer direct insight into the structural and textural composition of the subsoil. This paper describes an approach to also inspect the third dimension: by mapping during the ongoing excavation it is possible to obtain a three-dimensional representation of the subsurface within a short period of time. A detailed description of a case study is presented and the findings from sedimentological, hydrogeological and geophysical analyses are compared. The gravel pit is located near the town of Herten in southwest Germany, where relatively young unconsolidated fluvio-glacial and fluvial sediments in the Rhine basin are mined. The excavated gravel body is built up by architectural elements typical for braided river deposits. The study generated a high-resolution data set of lithofacies, hydrofacies and ground penetrating radar (GPR) profiles. It represents the basis for a full three-dimensional geostatistical reconstruction presented in the second part

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“…Han et al, 1986;Marion et al, 1992;Yamamoto et al, 1994Yamamoto et al, , 1995Pride, 2005). However, Hyndman and Tronicke (2005) stated that estimating the relation between geophysical and hydrogeophysical parameters is a site specific endeavor, since no general relation is expected.…”

Section: Introductionmentioning

confidence: 92%

An inversion strategy for hydraulic tomography: Coupling travel time and amplitude inversion

Brauchler

Cheng

Dietrich

et al. 2007

Journal of Hydrology

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Hydrogeophysical Case Studies at the Local Scale: The Saturated Zone

Cited by 24 publications

References 65 publications

Voxel inversion of airborne electromagnetic data for improved groundwater model construction and prediction accuracy

Voxel inversion of airborne electromagnetic data for improved groundwater model construction and prediction accuracy

Three-dimensional high resolution fluvio-glacial aquifer analog: Part 1: Field study

An inversion strategy for hydraulic tomography: Coupling travel time and amplitude inversion

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