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 20 of 25 for “"electrical resistivity tomography (ERT)"”.
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Dissolution-enlarged fractures imaging using electrical resistivity tomography (ERT)
<p>"In recent years the electrical imaging techniques have been largely applied to geotechnical and environmental investigations. These techniques have proven to be the best geophysical methods for site investigations in karst terrain, particularly when the overburden soil is clay-dominated. Karst …
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Electrical Resistivity Tomography (ERT) and electromagnetic (CMD) assessment of Scottish reservoir embankments
… could lead to erosion and slip surface with overtopping water. In most cases the failure of flood embankments causes flooding risk to local areas and puts inhabitants at risk. For this reason it is important to investigate the condition of the embankments and evaluate any internal erosion and …
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Imaging in karst terrain using the Electrical Resistivity Tomography (ERT) and Multi-Channel Analysis of Surface Waves (MASW) methods
<p>"Electrical Resistivity Tomography (ERT) and Multi-channel Analysis of Surface Waves (MASW) methods were used to image the subsurface in karst terrain in the southeast of Missouri. A SuperSting R8 system was used to acquire the ERT profiles; a multi-channel engineering seismograph was used to …
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Inspection of Earthen Embankment Dams Using Time Lapse Electrical Resistivity Tomography
… more confident evaluation of a dam's integrity. Electrical resistivity is one geophysical technique that would be useful in detecting internal flaws associated with seepage and piping because it is sensitive to moisture changes. A study is being conducted to examine the feasibility of electrical …
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Using electrical resistivity tomography to calibrate seawater intrusion models along the Alabama Gulf Coast
… by the availability of hydrological data, uncertainty in these results can be substantially reduced through the integration of field geophysical measurements. Field measurements employing electrical resistivity tomography (ERT) were utilized to calibrate a density-dependent groundwater flow …
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Imaging and mitigating karst features
… (2) map variations in engineering properties of soil/rock, (3) map variable depth to top of rock, (4) explore the utility of the geophysical techniques, (5) determine the factors contributing to karst processes, and (6) propose karst mitigation. Electrical resistivity tomography (ERT) …
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RESISTIVITY IMAGING OF PROMINENT SEEPAGE PATHWAYS IN KARST TERRAIN
… in Greene County, southwestern Missouri. Electrical resistivity tomography (ERT) was employed to image anomalously low resistivity zones associated with the presence of seepage pathways that were anthropogenic and/or natural in origin. Techniques including visual inspection (VI), …
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Geophysical assessment of soil and rock in the New Madrid seismic zone
… downhole seismic (DHS), seismic refraction tomography (SRT) and multichannel analysis of surface waves (MASW) data were acquired for the purpose of seismic site characterization. Shear wave and compressional wave velocities were used to estimate depth to bedrock and to generate 1-D plots …
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New Approaches In Hydrogeophysical Model Predictions: Case Studies From theP Reactor Area, Savannah River Site, South Carolina
… radar (GPR), P-wave seismic reflection, and electrical resistivity tomography (ERT) data collected at a contaminant site located in the vicinity of the P Reactor at Savannah River Site, South Carolina. These near-surface geophysical methods provide information at different scales of …
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Geophysical Imaging of Karst Features in Missouri
<p>"Automated electrical resistivity tomography (ERT) supported with multichannel analysis of surface waves (MASW) and boring data were used to map karst related features in Missouri in order to understand karst processes better in Missouri. Previous works on karst in Missouri were mostly surficial …
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Delineation of a coal combustion residue landfill and underlying karst subsurface in Southwest Missouri using ERT and MASW surveys
… for safe disposal and contamination control. Electrical resistivity tomography (ERT) and multichannel analysis of surface waves (MASW) data were acquired across and in proximity to a CCR landfill in southwest Missouri, USA, with the intent to identify potential karst features and seepage …
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Use of Georphysics to Map Subsurface Features at Levee Seepage Locaitons
… County were chosen to conduct this survey. Electrical Resistivity Tomography (ERT) and Electromagnetic Induction (EM) surveys were conducted on and adjacent to levees to identify seepage pathways and any dominant geological features at the sites. Results from geophysical surveys revealed …
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Laboratory Resistivity Measurements for Soil Characterization
<p>Field based electrical resistivity measurements, such as electrical resistivity tomography (ERT) and capacitively coupled resistivity (CCR), are geophysical methods that offer a non-destructive and rapid means to collect continuous data. As such, ERT and CCR are becoming increasingly popular …
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EVALUATION OF BEDROCK DEPTH AND SOIL INFILTRATION ALONG PENNYPACK CREEK USING ELECTRICAL RESISTIVITY TOMOGRAPHY AND MOISTURE LOGGERS
… this study was to use soil moisture loggers and electrical resistivity tomography (ERT) along the Pennypack Creek (Philadelphia, PA) to evaluate soil infiltration and bedrock depth in urban areas to ultimately access their impact on critical zone modeling. ERT was also used to validate or dispute …
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Geophysical Characterisation and Evolutionary Model of the Quaternary sediments in the North Offaly region of Central Ireland
… The geophysical methods employed were Electrical Resistivity Tomography (ERT), time-lapse resistivity imaging, azimuthal resistivity, Ground Penetrating Radar (GPR) and Very Low Frequency (VLF). Forward modelling with GPRSIM and RES2DMOD software and geophysical ground truth evaluation …
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Hydrogeophysical quantification of infiltration and recharge through soil-filled sinkholes using Time Domain Reflectometry and Electrical Resistivity Tomography
This dissertation presents the results of a detailed physical and hydrogeophysical study of two soil-filled sinkholes mantled by ancient New River fluvial terrace deposits. Research was performed at the Virginia Tech Kentland Experimental Farms in Whitethorne, Virginia, USA between fall 2003 and …
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MONITORING STORMWATER INFILTRATION IN A VACANT LOT COMPARING TIME-LAPSE ELECTROMAGNETIC INDUCTION AND ELECTRICAL RESISTIVITY TOMOGRAPHY
… irrigation tests using two geophysical methods (electrical resistivity tomography [ERT] and electromagnetic induction [EM]) to evaluate method sensitivity and differences between the three zones. ERT proved more sensitive than EM profiling at detecting changes in the three zones. Soil moisture …
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The use of near-surface geophysics for monitoring slopes that affect transport infrastructure
… slope failure. Here, the application of a novel electrical resistivity tomography (ERT) system (Proactive infrastructure Monitoring and Evaluation (PRIME)) for monitoring unstable slopes that affect transport infrastructure is examined. The system provides near-real-time data collection via a …
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Electrical Resistivity Tomography and Ground Penetrating Radar Measurements for Permafrost Detection on Strandartindur, Seyðisfjörður - East Iceland
Electrical resistivity tomography (ERT) and ground penetrating radar (GPR) measurements were performed to investigate permafrost’s potential presence and distribution on the slopes of Strandartindur, a mountain above Seydisfjordur in East Iceland. This is important as permafrost is retreating in …
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The Water Table and Soil Moisture Response Following the Removal of Conifers from an Encroached Meadow
… estimated using the Priestly Taylor equation. Electrical Resistivity Tomography (ERT) was used to determine maximum water table depths. A groundwater recession curve equation was used to model water table depths between water table depth sensor measurements and ERT measurements. Standard least …
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