An algorithm is developed to interpret self‐potential (SP) data in terms of distribution Darcy velocity the ground water. The model based on proportionality existing between streaming current density and velocity. Because inverse problem determination from SP underdetermined, we use Tikhonov regularization with a smoothness constraint differential Laplacian operator prior model. parameter determined by L‐shape method. depends localization number non‐polarizing electrodes information relative...

[1] Periodic pumping tests, in which a fluid is extracted during half period, then reinjected, have been used historically to estimate effective aquifer properties. In this work, we suggest modified approach periodic test analysis one uses several signals of different frequencies as stimulation, and responses are analyzed through inverse modeling using "steady-periodic" model formulation. We refer strategy multifrequency oscillatory hydraulic imaging. Oscillating tests advantages that noted,...

3‐D Hydraulic tomography (3‐D HT) is a method for aquifer characterization whereby the spatial distribution of flow parameters (primarily hydraulic conductivity, K ) estimated by joint inversion head change data from multiple partially penetrating pumping tests. While performance HT has been studied extensively in numerical experiments, few field studies have demonstrated real‐world HT. Here we report on transient THT) experiment at Boise Hydrogeophysical Research Site which different prior...

We have investigated the potential of combining cross‐hole georadar velocity and attenuation tomography as a method for characterizing heterogeneous alluvial aquifers. A multivariate statistical technique, known k ‐means cluster analysis, is used to correlate integrate information contained in tomograms. Cluster analysis allows us identify objectively major common trends tomographic data thus “reduce” limited number characteristic parameter combinations. The application this procedure two...

The importance of estimating spatially variable aquifer parameters such as transmissivity is widely recognized for studies in resource evaluation and contaminant transport. A useful approach mapping inverse modeling data from series pumping tests, that is, via hydraulic tomography. This inversion field tomographic requires development numerical forward models can accurately represent test conditions while maintaining computational efficiency. One issue this presents specification boundary...

We investigate, through numerical experiments, the viability of three‐dimensional transient hydraulic tomography (3DTHT) for identifying spatial distribution groundwater flow parameters (primarily, conductivity K ) in permeable, unconfined aquifers. To invert large amount data collected from 3DTHT surveys, we utilize an iterative geostatistical inversion strategy which outer iterations progressively increase number points fitted and inner solve quasi‐linear formulas Kitanidis. In order to...

Hydraulic tomography is a field scale aquifer characterization method capable of estimating 3‐D heterogeneous parameter distributions, and directly sensitive to hydraulic conductivity (K), thus providing useful data source for improving flow transport models. We present results from proof‐of‐concept modeling study in which we apply transient (3DTHT) the relatively high‐K moderately unconfined at Boise Hydrogeophysical Research Site. Short‐duration (20 min) partially penetrating pumping...

Abstract We present the first demonstration of hydraulic tomography (HT) to estimate three‐dimensional (3D) conductivity ( K ) distribution a fractured aquifer at high‐resolution field scale (HRFS), including fracture network and connectivity through it. invert drawdown data collected from packer‐isolated borehole intervals during 42 pumping tests in wellfield former Naval Air Warfare Center, West Trenton, New Jersey, Newark Basin. Five additional were reserved for quality check HT results....

The geostatistical structure of a heterogeneous coarse fluvial aquifer is investigated with porosity data derived from neutron logs at research well field (Boise Hydrogeophysical Research Site, or BHRS) that was designed, in part, to support three‐dimensional analysis hydrologic and geophysical parameters. Recognizing the deposits include subdivisions (units between bounding surfaces), we adopt hierarchical approach examine geostatistics three scales. At BHRS, saturated as whole (maximum...

Abstract Ground water flow associated with pumping and injection tests generates self‐potential signals that can be measured at the ground surface used to estimate pattern of depth. We propose an inversion accounts for heterogeneous nature aquifer a relationship between electrical resistivity streaming current coupling coefficient. recast data into Bayesian framework. Synthetic are performed showing advantage in using addition situ measurements potentiometric levels reconstruct shape table....

To evaluate the uncertainty of water‐saturated sediment velocity and porosity estimates derived from surface‐based, ground‐penetrating radar reflection tomography, we conducted a controlled field experiment at Boise Hydrogeophysical Research Site (BHRS). The BHRS is an experimental well located near Boise, Idaho. data set consisted 3‐D multioffset acquired on orthogonal 20 × 30 m surface grid that encompassed 13 boreholes. Experimental control included (1) 1‐D vertical functions determined...

Abstract Hydraulic tomography is an emerging field and modeling method that provides a continuous hydraulic conductivity ( K ) distribution for investigated region. Characterization approaches rely on interpolation between one‐dimensional 1D profiles have limited ability to accurately identify high‐ channels, juxtapositions of lenses with high contrast, breaches in layers or channels such profiles. However, locating these features especially important groundwater flow transport modeling,...

Modeling and laboratory experiments have demonstrated the ability of oscillatory hydraulic tomography (OHT) to characterize heterogeneity in aquifer properties. In OHT, a location is stressed via periodic pumping/injection at set frequency, resulting head signal measured number monitoring locations. The source oscillations repeatedly moved, allowing tomographic imaging Changing period oscillation also results observations with additional information. theory, OHT comparable other methods that...

Research Article| September 01, 2004 Significance of porosity for stratigraphy and textural composition in subsurface, coarse fluvial deposits: Boise Hydrogeophysical Site Warren Barrash; Barrash 1Center Geophysical Investigation the Shallow Subsurface Department Geosciences, State University, Boise, Idaho 83725, USA Search other works by this author on: GSW Google Scholar Edward C. Reboulet Author Article Information Publisher: Geological Society America Received: 31 Mar 2003 Revision 15...

In this opinion paper we contend that high‐resolution characterization, monitoring, and prediction are the key elements to advancing reducing uncertainty in our understanding of subsurface processes at basin scales. First, advocate recently developed tomographic surveying is an effective approach for characterizing field‐scale subsurface. Fusion different types surveys further enhances characterization. A appropriate scale many water resources management purposes. We thereby propose...

Characterizing the subsurface is important for many hydrogeologic projects such as site remediation and groundwater resource exploration. Methods based on analysis of conventional pumping tests have notable disadvantage that at a certain distance, signal small relative to noise due effects recharge, in neighboring wells, change level or adjacent streams, other common disturbances. This work focuses oscillatory which fluid extracted half period, then reinjected. We discuss major advantage...

Abstract Oscillatory pumping tests—in which flow is varied in a periodic fashion—provide method for understanding aquifer heterogeneity that complementary to strategies such as slug testing and constant‐rate tests. During oscillatory testing, pressure data collected at non‐pumping wells can be processed extract metrics, signal amplitude phase lag, from time series. These metrics are robust against common sensor problems (including drift noise) have been shown provide information about...

Estimation of the three‐dimensional (3‐D) distribution hydrologic properties and related uncertainty is a key for improved predictions processes in subsurface. However it difficult to gain high‐quality high‐density information from In this regard promising strategy use high‐resolution geophysical data (that are relatively sensitive variations parameter interest) supplement direct measurements wells (e.g., logs, vertical profiles) then generate stochastic simulations property conditioned on...

To determine the distribution of heterogeneities in saturated zone an unconfined aquifer Boise, ID, we compute tomograms for three adjacent well pairs. The fluvial deposits consist unconsolidated cobbles and sands. We used a curved-ray, finite-difference approximation to eikonal equation generate forward model. inversion uses linearized, iterative scheme slowness from first arrival traveltimes. layered representing aquifer. velocities this range between [Formula: see text]. use variety...

Ground-penetrating radar (GPR) attenuation-difference tomography is a useful tool for imaging the migration of electrically anomalous tracer or contaminant plumes. Attenuation-difference uses difference in trace amplitudes tomographic data sets collected at different times to image distribution bulk-conductivity changes within medium. The most common approach computing sensitivities ray theory, which well understood and leads efficient computations. However, theory requires assumption that...