2-D joint structural inversion of cross-hole electrical resistance and ground penetrating radar data

Bouchedda, Abderrezak; Chouteau, Michel; Binley, Andrew; Giroux, Bernard

doi:10.1016/j.jappgeo.2011.10.009

Cited by 33 publications

(17 citation statements)

References 45 publications

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“…Combined cross‐borehole ERT and ground‐penetrating radar (GPR) methods are being used in an attempt to determine the downward migration of water and tracer in unsaturated alluvial sand sediments (Looms et al, 2008). A joint inversion code between borehole ERT and borehole GPR has also been developed (Bouchedda, 2010; Bouchedda et al, 2012). In hydrogeology, advances have been made in the development of a technique for the characterization of a recharge pond and for monitoring infiltration through the use of vertical ERT profiles (Mawer et al, 2013).…”

Section: Theorymentioning

confidence: 99%

Estimation of Saturated Hydraulic Conductivity during Infiltration Test with the Aid of ERT and Level‐Set Method

Chou

Chouteau

Dubé

2016

Vadose Zone Journal

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Core Ideas A new technique for estimating the saturated hydraulic conductivity is developed. It uses a combination of hydrogeophysical and numerical methods. Electrical resistivity tomography and the instantaneous profile method are used. The technique is validated using simple and complex numerical hydrogeological models. Many hydrogeological and geophysical tools have been developed to determine subsoil properties, but they are often limited by sparse datasets and by the portability of the method from one site to another and often underestimate the complexity of the medium. We present a saturated hydraulic conductivity (Ks) estimation scheme, named the KES method, based on hydrogeophysical and numerical methods. The targeted medium of investigation is an unsaturated and heterogeneous soil. Estimation of Ks is accomplished by estimating the position of the wetting front and the distribution and velocity of flow lines during an infiltration test. Using numerical modeling, Ks is determined by minimizing the velocity difference between the measured flow lines and the modeled flow lines. Surface and buried electrodes are used as part of the electrical resistivity survey in determining the position of the wetting front. An instantaneous profile method is used to determine the water retention curve of the medium. The KES method has been tested and validated using data produced from simple and more complex geological models from published case studies. We obtained good reconstruction of the saturated hydraulic conductivity. We have found that the estimated value of Ks in log scale has a mean error <2.5%. Error increases along the boundaries of different hydrofacies.

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Section: Theorymentioning

confidence: 99%

Estimation of Saturated Hydraulic Conductivity during Infiltration Test with the Aid of ERT and Level‐Set Method

Chou

Chouteau

Dubé

2016

Vadose Zone Journal

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“…A priori information constrained method is recently used in mineral mapping and aquifer characterization with a good result. This method contains known geological information, rock resistivity information revealed by drilling, and other relative information obtained from other detection methods (Jegen et al, 2009;Abedi et al, 2012;Bouchedda et al, 2012;Doetsch et al, 2012). The DC resistivity method based on constraint by a priori information is one of promising research directions in this field.…”

Section: Routine Detectionmentioning

confidence: 99%

Detecting and monitoring of water inrush in tunnels and coal mines using direct current resistivity method: A review

Liu

Nie

et al. 2015

Journal of Rock Mechanics and Geotechnical Engineering

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a b s t r a c tDetecting, real-time monitoring and early warning of underground water-bearing structures are critically important issues in prevention and mitigation of water inrush hazards in underground engineering. Direct current (DC) resistivity method is a widely used method for routine detection, advanced detection and real-time monitoring of water-bearing structures, due to its high sensitivity to groundwater. In this study, the DC resistivity method applied to underground engineering is reviewed and discussed, including the observation mode, multiple inversions, and real-time monitoring. It is shown that a priori information constrained inversion is desirable to reduce the non-uniqueness of inversion, with which the accuracy of detection can be significantly improved. The focused resistivity method is prospective for advanced detection; with this method, the flanking interference can be reduced and the detection distance is increased subsequently. The time-lapse resistivity inversion method is suitable for the regions with continuous conductivity changes, and it can be used to monitor water inrush in those regions. Based on above-mentioned features of various methods in terms of benefits and limitations, we propose a three-dimensional (3D) induced polarization method characterized with multi-electrode array, and introduce it into tunnels and mines combining with real-time monitoring with time-lapse inversion and cross-hole resistivity method. At last, the prospective applications of DC resistivity method are discussed as follows: (1) available advanced detection technology and instrument in tunnel excavated by tunnel boring machine (TBM), (2) high-resolution detection method in holes, (3) four-dimensional (4D) monitoring technology for water inrush sources, and (4) estimation of water volume in water-bearing structures.

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“…To control the amount of the smoothing in each direction, we use four structural weighting diagonal matrices W x ; W y ; W d 1 ; W d 2 , respectively assigned to aforementioned smoothing matrices. Using this approach, we can apply different weights factors to each model cell [8,22]. Thus, by introducing the weighting matrices, the smoothing matrix C m entering in the regularizer of Eq.…”

Section: Inverse Problemmentioning

confidence: 99%

Image-guided inversion in steady-state hydraulic tomography

Ahmed

Zhou

Jardani

et al. 2015

Advances in Water Resources

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a b s t r a c tIn steady-state hydraulic tomography, the head data recorded during a series of pumping or/and injection tests can be inverted to determine the transmissivity distributions of an aquifer. This inverse problem is usually under-determined and ill-posed. We propose to use structural information inferred from a guiding image to constrain the inversion process. The guiding image can be drawn from soft data sets such as seismic and ground penetrating radar sections or from geological cross-sections inferred from the wells and some geological expertise. The structural information is extracted from the guiding image through some digital image analysis techniques. Then, it is introduced into the inversion process of the head data as a weighted four direction smoothing matrix used in the regularizer. Such smoothing matrix allows applying the smoothing along the structural features. This helps preserving eventual drops in the hydraulic properties. In addition, we apply a procedure called image-guided interpolation. This technique starts with the tomogram obtained from the image-guided inversion and focus this tomogram. These new approaches are applied on four synthetic toy problems. The hydraulic distributions estimated from the image-guided inversion are closer to the true transmissivity model and have higher resolution than those computed from a classical Gauss-Newton method with uniform isotropic smoothing.

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2-D joint structural inversion of cross-hole electrical resistance and ground penetrating radar data

Cited by 33 publications

References 45 publications

Estimation of Saturated Hydraulic Conductivity during Infiltration Test with the Aid of ERT and Level‐Set Method

Estimation of Saturated Hydraulic Conductivity during Infiltration Test with the Aid of ERT and Level‐Set Method

Detecting and monitoring of water inrush in tunnels and coal mines using direct current resistivity method: A review

Image-guided inversion in steady-state hydraulic tomography

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