On the Performance of Pilot‐Point Based Hydraulic Tomography with a Geophysical a Priori Model

Poduri, Sarada and Kambhammettu, B.V.N.P. (2021) On the Performance of Pilot‐Point Based Hydraulic Tomography with a Geophysical a Priori Model. Groundwater, 59 (2). pp. 214-225. ISSN 0017-467X

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Abstract

We present a novel method to estimate the hydraulic and storage properties of a heterogeneous aquifer system using pilot-point-based hydraulic tomography (HT) inversion in conjunction with a geophysical a priori model. The a priori model involved a soil stratification obtained by combining electrical resistivity tomography inversion and field data from hydrogeological experiments. Pilot-point densities were assigned according to the stratification, which also constrained aquifer parameters during HT inversion. The forward groundwater flow model, HydroGeoSphere, was supplied to the parameter-estimation tool, PEST, to perform HT inversion. The performance of our method was evaluated on a hypothetical, two-dimensional, multi-layered, granitic aquifer system representative of those commonly occurring in the Kandi region in Telangana. Inversion results were compared using two commonly adopted methods of modeling parameter-heterogeneity: (1) using piece-wise zones of property values obtained from geostatistical interpolation of local-scale estimates; and (2) HT inversion starting from a homogeneous parameter field with a uniform distribution of pilot-points. Performances of the inverted models were evaluated by conducting independent pumping tests and statistical analyses (using a Taylor diagram) of the model-to-measurement discrepancies in drawdowns. Our results showed that using the aforementioned geophysical a priori model could improve the parameter-estimation process.

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IITH Creators:
IITH CreatorsORCiD
Poduri, SaradaUNSPECIFIED
Kambhammettu, B.V.N.P.UNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Electrical resistivity tomography; Geostatistical interpolation; Groundwater Flow Model; Heterogeneous aquifers; Hydraulic tomographies; Parameter estimation process; Soil stratification; Uniform distribution;electrical resistivity; experimental study; geophysical method; groundwater flow; heterogeneity; interpolation; inverse analysis; parameter estimation; performance assessment; tomography
Subjects: Civil Engineering
Divisions: Department of Civil Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 24 Jul 2021 10:17
Last Modified: 24 Jul 2021 10:17
URI: http://raiith.iith.ac.in/id/eprint/8502
Publisher URL: http://doi.org/10.1111/gwat.13053
OA policy: https://v2.sherpa.ac.uk/id/publication/3745
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