Determlning and Mapplng DNAPL Saturation Values from Noninvasive GPR Measurements

Sneddon, Kristen W.; Olhoeft, Gary R.; Powers, Michael H.

doi:10.4133/1.2922755

Cited by 17 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cross-hole radar methods have been used successfully to image mass transport associated with tracer tests, fluid injections, and natural physical processes. Radar methods have been used to monitor release of dense, non-aqueous phase liquids (DNAPLs) (Olhoeft 1992;Greenhouse et al 1993) and to estimate spatially variable DNAPL saturation (Sneddon et al 2000). In conjunction with tracers, cross-hole radar tomography has facilitated (1) identification of fluid flow through fractures and fracture zones in crystalline rocks (Ramirez and Lytle 1986;Niva et al 1988;Olsson et al 1992;Lane et al 2000;Day-Lewis et al 2003); (2) identification of flow paths in dual-porosity media (Lane et al 1998) and unconsolidated sediments (Kong et al 1994;Hubbard et al 2001); and (3) monitoring of unsaturated zone recharge (Eppstein and Dougherty 1998;Binley et al 2001).…”

Section: Radar Methodsmentioning

confidence: 99%

Geophysical Monitoring of a Field‐Scale Biostimulation Pilot Project

2005

View full text Add to dashboard Cite

The USGS conducted a geophysical investigation in support of a U.S. Naval Facilities Engineering Command, Southern Division field-scale biostimulation pilot project at Anoka County Riverfront Park (ACP), down-gradient of the Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota. The goal of the pilot project is to evaluate subsurface injection of vegetable oil emulsion (VOE) to stimulate microbial degradation of chlorinated hydrocarbons. To monitor the emplacement and movement of the VOE and changes in water chemistry resulting from VOE dissolution and/or enhanced biological activity, the USGS acquired cross-hole radar zero-offset profiles, travel-time tomograms, and borehole geophysical logs during five site visits over 1.5 years. Analysis of pre- and postinjection data sets using petrophysical models developed to estimate VOE saturation and changes in total dissolved solids provides insights into the spatial and temporal distribution of VOE and ground water with altered chemistry. Radar slowness-difference tomograms and zero-offset slowness profiles indicate that the VOE remained close to the injection wells, whereas radar attenuation profiles and electromagnetic induction logs indicate that bulk electrical conductivity increased down-gradient of the injection zone, diagnostic of changing water chemistry. Geophysical logs indicate that some screened intervals were located above or below zones of elevated dissolved solids; hence, the geophysical data provide a broader context for interpretation of water samples and evaluation of the biostimulation effort. Our results include (1) demonstration of field and data analysis methods for geophysical monitoring of VOE biostimulation and (2) site-specific insights into the spatial and temporal distributions of VOE at the ACP.

show abstract

Section: Radar Methodsmentioning

confidence: 99%

Geophysical Monitoring of a Field‐Scale Biostimulation Pilot Project

2005

View full text Add to dashboard Cite

show abstract

“…Water leak detection systems is of increasing interest because of increasing deterioration or damage to the distribution systems, which involve a significant economic loss for the water network managing authorities. A number of methods of leak detection have been proposed in the literature as, for example, tracer gas, thermography, flow and pressure modelling [1], ground penetrating radar (GPR) [2], acoustic through the use of hydrophones [3].…”

Section: Introductionmentioning

confidence: 99%

Design and Characterization of a Pressure Sensor Based on FBG on Steel Substrate

Andò

Baglio

Pistorio

et al. 2019

7th International Symposium on Sensor Science

View full text Add to dashboard Cite

In this paper a new optical, Fiber Bragg Grating (FBG) based, pressure sensor is presented. The sensor adopts a stainless steel membrane with a FBG sensor attached and is thought to be used in a multi parametric multi-sensor system aimed at the detection of water leakages in potable water networks. The sensor has been experimentally characterized on a reference plant in the range of pressure 0–6 bar. Main metrological characteristics of the lab-scale prototype developed are: a sensitivity of 0.314 nm/bar, an accuracy of about 39 mbar and a resolution of about 1.5 mbar.

show abstract

“…Chlorinated solvents, including trichloroethylene (TCE), tetrachloroethylene (PCE), and carbon tetrachloride, are the most important sub-class of DNAPLs due to their wide-spread use in the electronics, chemical, dry-cleaning, and metal fabrication industries. A variety of geophysical techniques have been proposed for the detection of DNAPLs in the shallow subsurface (Romig, 2000) including groundpenetrating radar (GPR) (Olhoeft, 1992; Brewster and Annan, 1994;Sneddon et al, 2000), seismic techniques (Temples et al, 2001), nuclear magnetic resonance (NMR) ( Bryar and Knight, 2003), resistivity methods (Newmark et al, 1997), induced polarization ( Grimm and Olhoeft, 2004;Briggs et al, 2004), and spontaneous potential measurements . However, most of these methods lack the spatial resolution and/ or sensitivity for the direct characterization of small DNAPL lenses or pools.…”

Section: Introductionmentioning

confidence: 99%