A new sequential procedure for hydraulic tomographic inversion

Jiménez, S.; Brauchler, R.; Bayer, Peter

doi:10.1016/j.advwatres.2013.10.002

Cited by 37 publications

(50 citation statements)

References 63 publications

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“…3D transient HT (THT) involves conducting a series of discrete‐interval pumping tests with discrete‐interval pressure observations at multiple locations, and the data are analyzed through inversion of all tests together. HT has been evolving over the past two decades (Gottlieb and Dietrich ); numerical and laboratory examples have contributed to HT operational improvements including increased effectiveness in observation types, times, and networks (e.g., Cardiff et al ; Sun et al ), and in computational efficiencies (Liu and Kitanidis ; Brauchler et al ; Cardiff et al ; Jiménez et al ; Liu et al , ; Lee and Kitanidis ). Cardiff and Barrash () provided a comprehensive summary of 2D and 3D HT studies.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Tomography: Continuity and Discontinuity of High‐K and Low‐K Zones

Hochstetler¹,

Barrash

Leven

et al. 2015

Groundwater

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Hydraulic tomography is an emerging field and modeling method that provides a continuous hydraulic conductivity (K) distribution for an investigated region. Characterization approaches that rely on interpolation between one-dimensional (1D) profiles have limited ability to accurately identify high-K channels, juxtapositions of lenses with high K contrast, and breaches in layers or channels between such profiles. However, locating these features is especially important for groundwater flow and transport modeling, and for design and operation of in situ remediation in complex hydrogeologic environments. We use transient hydraulic tomography to estimate 3D K in a volume of 15-m diameter by 20-m saturated thickness in a highly heterogeneous unconfined alluvial (clay to sand-and-gravel) aquifer with a K range of approximately seven orders of magnitude at an active industrial site in Assemini, Sardinia, Italy. A modified Levenberg-Marquardt algorithm was used for geostatistical inversion to deal with the nonlinear nature of the highly heterogeneous system. The imaging results are validated with pumping tests not used in the tomographic inversion. These tests were conducted from three of five clusters of continuous multichannel tubing (CMTs) installed for observation in the tomographic testing. Locations of high-K continuity and discontinuity, juxtaposition of very high-K and very low-K lenses, and low-K "plugs" are evident in regions of the investigated volume where they likely would not have been identified with interpolation from 1D profiles at the positions of the pumping well and five CMT clusters. Quality assessment methods identified a suspect high-K feature between the tested volume and a lateral boundary of the model.

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Section: Introductionmentioning

confidence: 99%

Hydraulic Tomography: Continuity and Discontinuity of High‐K and Low‐K Zones

Hochstetler¹,

Barrash

Leven

et al. 2015

Groundwater

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“…A critical point which is often raised when considering applications of hydraulic tomography (e.g., Leven and Dietrich, 2006;Raghavan, 2009;Bohling and Butler, 2010;Delay et al, 2012;Jiménez et al, 2013) is the assessment of the number of available independent (and/or redundant) drawdown observations and their impact on the solution of the inverse problem. The issue arises when interpretation and inverse modeling are based on mathematical formulations of the classical single-continuum approach to three-dimensional flow grounded on Darcy's law.…”

Section: Introductionmentioning

confidence: 99%

Identification of groundwater flow parameters using reciprocal data from hydraulic interference tests

Marinoni

Delay

Ackerer

et al. 2016

Journal of Hydrology

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“…For the lowercentral zone, we obtain a similarly good match with an inverted value of 1.6 × 10 −4 m s −1 in comparison to the original value of 2.96 × 10 −4 m s −1 for the dominant hydrofacies H5 (Table 1). This is remarkable, keeping in mind that related travel-time-based techniques of hydraulic tomography have proven to be suited for structural reconstruction, but to a lesser extent for hydraulic parameter estimation (similar match values are found in Brauchler et al, 2007;Cardiff et al, 2013;Jiménez et al, 2013). In many of those studies, parameter values were obtained by ex post calibration with the full forward model (Hu et al, , 2015Jiménez et al, 2013).…”

Section: Reconstruction Of Hydraulic Conductivity Profilesmentioning

confidence: 99%

“…This method has been applied for hydraulic tomography in several studies (Brauchler et al, 2013a, b;Jiménez et al, 2013) and uses the distribution of the inverted transport paths over the inversion grid. The nullspace energy map is calculated from the singular value decomposition (SVD) of the tomographic matrix, which contains the length of each inverted transport path in each grid cell.…”

Section: Staggered Grids and Null-space Energymentioning

confidence: 99%

“…To improve spatial resolution, they applied staggered grids (Vesnaver and Böhm, 2000) during inversion. This inversion methodology was applied to several hydraulic laboratory and field experiments (Brauchler et al, 2007(Brauchler et al, , 2013bHu et al, 2011;Jiménez et al, 2013). Brauchler et al (2013a) also utilized travel times in a tracer experiment on rock samples on the laboratory scale.…”

Section: Introductionmentioning

confidence: 99%

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Travel-time-based thermal tracer tomography

Somogyvári

Bayer

Brauchler

2016

Hydrol. Earth Syst. Sci.

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Abstract. Active thermal tracer testing is a technique to get information about the flow and transport properties of an aquifer. In this paper we propose an innovative methodology using active thermal tracers in a tomographic setup to reconstruct cross-well hydraulic conductivity profiles. This is facilitated by assuming that the propagation of the injected thermal tracer is mainly controlled by advection. To reduce the effects of density and viscosity changes and thermal diffusion, early-time diagnostics are used and specific travel times of the tracer breakthrough curves are extracted. These travel times are inverted with an eikonal solver using the staggered grid method to reduce constraints from the predefined grid geometry and to improve the resolution. Finally, non-reliable pixels are removed from the derived hydraulic conductivity tomograms. The method is applied to successfully reconstruct cross-well profiles as well as a 3-D block of a high-resolution fluvio-aeolian aquifer analog data set. Sensitivity analysis reveals a negligible role of the injection temperature, but more attention has to be drawn to other technical parameters such as the injection rate. This is investigated in more detail through model-based testing using diverse hydraulic and thermal conditions in order to delineate the feasible range of applications for the new tomographic approach.

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A new sequential procedure for hydraulic tomographic inversion

Cited by 37 publications

References 63 publications

Hydraulic Tomography: Continuity and Discontinuity of High‐K and Low‐K Zones

Hydraulic Tomography: Continuity and Discontinuity of High‐K and Low‐K Zones

Identification of groundwater flow parameters using reciprocal data from hydraulic interference tests

Travel-time-based thermal tracer tomography

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