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 Creators	ORCiD
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:

02 Mar 2022 07:00

URI:

http://raiithold.iith.ac.in/id/eprint/8502