Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"geophysical measurements"”.
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Wettability assessment using resistivity and NMR measurements
… multi-phase fluid flow and rock physics measurements. This impacts the relative permeability, recovery factor, choice of enhanced oil recovery method, and reservoir characterization. Wettability can be assessed using contact angle measurements and the imbibition-based Amott and USBM …
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Using electrical resistivity tomography to calibrate seawater intrusion models along the Alabama Gulf Coast
… reduced through the integration of field geophysical measurements. Field measurements employing electrical resistivity tomography (ERT) were utilized to calibrate a density-dependent groundwater flow model for Gulf Shores, Alabama. Specifically, six independent ERT profiles were produced …
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Evaluation of geophysical methods to characterize alluvial soils in the arid environment
Non-intrusive geophysical investigations, both seismic and electrical, were performed at several locations on the Las Vegas Springs Preserve in Las Vegas, Nevada, along with intrusive drilling. These investigations were conducted to determine whether it is possible use geophysical methods to detect …
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Investigating the impact of microbial interactions with geologic media on geophysical properties
… formation in porous media. In addition, acoustic measurements may provide diagnostic spatiotemporal data for the validation of bioclogging models/simulations. Collectively, this study provides further evidence that geophysical measurements are sensitive to microbial-induced changes to geologic …
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Development of an acoustic vorticity meter to measure shear in ocean-boundary layers
… waves and currents that can swamp small scale measurements of shear. The thesis describes the desired geophysical measurements and translates this oceanographic context into design goals. The instrument was designed, built, tested, and deployed. It measures three-axis vorticity at 0.83 and 2.45 …
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High-Resolution Seismic Characterization of Shallow Sedimentary Structure for Freshwater Resources and Karstic Voids
… void detection. The research integrates various geophysical measurements and numerical modeling to address these multifaceted objectives. First, the field performance of two impulsive borehole seismic sources, Scorpion and Ballard, is rigorously examined at a Gulf of Mexico coastal site. Both …
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Sub-Ice Relief and Geology of East Antarctica
… with critically assessed results of previous geophysical and geological investigations, has allowed some interpretation of the geological structure and glacial history of East Antarctica. A comparison of the relative and absolute accuracy of radio echo sounding results and seismic-gravity data …
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Investigation of the Relationships Between Geotechnical Sediment Properties and Sediment Dynamics Using Geotechnical and Geophysical Field Measurements
… of nearshore sediment dynamics. Geotechnical and geophysical measurements were conducted at different sites: Delaware Bay, Delaware; Pea Island, North Carolina; York River, Virginia; Potomac River, Maryland; Guadalupe River, Brazos River, Colorado River, Texas with different soil types and …
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Integrity Assessment Of Earthen Dams And Levees Using Cross-Plot Analysis Of Seismic Refraction And Electrical Resistivity Tomograms
Geophysical methods provide a rapid, economical, non-invasive, and spatial coverage of the subsurface in terms of geophysical properties. On the other hand, geophysical methods can generate multiple geophysical anomalies. An anomaly on a seismic refraction or an electrical resistivity tomogram is …
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Inversion strategies for seismic surface waves and time-domain electromagnetic data with application to geotechnical characterization examples.
Geophysical methods are broadly used to map the subsurface. Their ability to investigate large areas in a short time and to reach significant depths with good resolution makes them suitable for a wide range of applications: from hydrological studies, mineral exploration, archaeological …
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Towards monitoring volcanoes in Iceland and Hawai’i with seismic velocity variations
… subsequent rifting event alters the CCFs, making measurements of dv/v unreliable during the 6-month eruption. However, volcanic tremor can be located by measuring the arrival times of the main peak in the CCFs of pairs across the network. I locate tremor under Vatnajökull glacier, associated with …
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Integrated geophysical studies at Masaya volcano, Nicaragua
… dynamic micro-gravity, deformation and gas flux measurements. The acquisition of extended temporal and spatial geophysical data will also allow for the development of robust models for the dynamics of magmatic systems. Masaya volcano, Nicaragua, is one of the most active systems in Central …
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Anomalous transport through porous and fractured media
… length shows qualitative agreement with geophysical measurements. Thus, the proposed correlated CTRW modeling approach furnishes a simple yet powerful framework for characterizing the impact of flow correlation and heterogeneity on transport in porous and fractured media. Finally, we …
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Seismic Expressions of Paleokarst
… map of paleokarst locations was generated, and geophysical measurements for some of these locations were taken for further analysis. </p> <p>In the Arkoma Basin, the Ordovician Viola Limestone, Mississippian Caney Shale, Pennsylvanian Jefferson Sandstone and Wapanucka Limestone were mapped on …