Geophysical Surveys Across the Boise Hydrogeophysical Research Site to Determine Geophysical Parameters of a Shallow, Alluvial Aquifer

Clement, William P.; Knoll, Michael D.; Liberty, Lee M.; Donaldson, Paul R.; Michaels, Paul; Barrash, Warren; Pelton, John R.

doi:10.4133/1.2922632

Cited by 19 publications

(15 citation statements)

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“…The BHRS was established for the purpose of developing methodologies for joint geophysical/hydrological characterization of the 3-D distribution of hydrological parameters in unconsolidated heterogeneous alluvial deposits (Barrash and Knoll, 1998;Clement et al, 1999). The subsurface at the site is characterized by an approximately 20-m-thick alluvial layer consisting predominantly of gravel and sand with minimal fractions of silt and clay, which is underlain by a layer of red clay with a thickness of at least 3 m. At the time of the geophysical measurements (October 1998), the water table was at a depth of 2.96 m.…”

Section: Application To Field Datamentioning

confidence: 99%

Simulated-annealing-based conditional simulation for the local-scale characterization of heterogeneous aquifers

Dafflon

Irving

Holliger

2009

Journal of Applied Geophysics

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Section: Application To Field Datamentioning

confidence: 99%

Simulated-annealing-based conditional simulation for the local-scale characterization of heterogeneous aquifers

Dafflon

Irving

Holliger

2009

Journal of Applied Geophysics

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“…3). Strong reflections in surface (Clement et al, 1999) and borehole radar (Clement et al, 2001), and borehole seismic (Liberty et al, 2000) profiles occur at some unit boundaries and locally within some units.…”

Section: Hydrogeologic Settingmentioning

confidence: 99%

Crosshole Radar Tomography in a Fluvial Aquifer near Boise, Idaho

Clement

Barrash

2006

JEEG

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To determine the distribution of heterogeneities in the saturated zone of an unconfined aquifer in Boise, ID, we compute tomograms for three adjacent well pairs. The fluvial deposits consist of unconsolidated cobbles and sands. We used a curved-ray, finite-difference approximation to the eikonal equation to generate the forward model. The inversion uses a linearized, iterative scheme to determine the slowness distribution from the first arrival traveltimes. The tomograms consist of a layered zone representing the saturated aquifer. The velocities in this saturated zone range between 0.06 to 0.10 m/ns. We use a variety of methods to assess the reliability of our velocity models. Finally, we compare our results to neutron-derived porosity logs in the wells used for the tomograms. The comparison shows that the trends in porosity derived from the tomograms match the trends in porosity measured with the neutron probe.

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“…The earth model that we selected is representative of the types of features and electrical property variations that we expect at the Boise Hydrogeophysical Research Site (BHRS), the focus of an intense investigation of geophysical and hydrologic parameter distribution in a heterogeneous, coarse, alluvial aquifer Clement et al, 1999;Peterson et al, 1999). The synthetic modeling results in this paper provide insight into the capabilities and limitations of different tomography methods and the level of detail that can be reliably interpreted from tomographic images of the site.…”

Section: Introductionmentioning

confidence: 99%

Tomographic Inversion of Crosshole Radar Data: Confidence in Results

Clement¹,

Knoll²

2000

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2000

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. AUTHOR(S) ON REPRINT PERFORMING ORGANIZATION NAMES(S) AND ADDRESS(ES)Boise State University ABSTRACT Crosshole radar tomography is increasingly being used to characterize the shallow subsurface and to monitor hydrologic processes. Although tomographic inversion provides a subsurface model, confidently interpreting the resulting image can be challenging. We conducted a simple modeling study to better understand the capabilities and limitations of tomographic inversion. We start with a known earth model, simulate a tomography experiment, and invert the synthetic data. We investigate the effects of straight and curved ray approximations to wave propagation, regularization,grid size, and starting model. We also investigate the effects of limited ray coverage through the earth model and noise in the data. Understanding the effects of these different methods and parameterizations will help us place confidence limits on modeled features to more accurately reflect our knowledge of the subsurface.

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Geophysical Surveys Across the Boise Hydrogeophysical Research Site to Determine Geophysical Parameters of a Shallow, Alluvial Aquifer

Cited by 19 publications

References 0 publications

Simulated-annealing-based conditional simulation for the local-scale characterization of heterogeneous aquifers

Simulated-annealing-based conditional simulation for the local-scale characterization of heterogeneous aquifers

Crosshole Radar Tomography in a Fluvial Aquifer near Boise, Idaho

Tomographic Inversion of Crosshole Radar Data: Confidence in Results

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