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 13 of 13 for “"Resistivity Imaging"”.
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Characterizing soil erosion potential using electrical resistivity imaging
… also influence soil in situ bulk electrical resistivity (ER) measurements. The objective of this study was to characterize soil erosion potential by correlating the in situ ER of soil with erodibility measured in the Kansas State University Erosion Function Apparatus (KSU-EFA). ER surveys …
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RESISTIVITY IMAGING OF PROMINENT SEEPAGE PATHWAYS IN KARST TERRAIN
… 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), multichannel …
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Hydrologic Process Parameterization of Electrical Resistivity Imaging of Solute Plumes Using POD MCMC
… of the algorithm with synthetic electrical resistivity imaging of unimodal and bimodal solute plumes. The unimodal plume was consistent with the hypothesis underlying the generation of the TIs whereas bimodality in the target plume morphology was not theorized. The same set of TIs were, …
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Determining the influence of transpiration on soil moisture pathways using electrical resistivity imaging
… daily transpiration using time-lapse electrical resistivity imaging (ERI) on a ponderosa pine and the surrounding soil during the growing season. By comparing sapflow measurements to the ERI data, we find that high periods of sapflow within the diel cycle are aligned with decreases in ground …
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Time-lapse Geophysical Investigations over Known Archaeological Features Using Electrical Resistivity Imaging and Earth Resistance
… has monitored the gradual variation of measured resistivity over a selection of study areas. By targeting difficult to find, and often ‘missing’ electrical anomalies of known archaeological features, this study has increased the understanding of both the detection and interpretation capabilities …
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Using Electrical Resistivity Imaging to Relate Surface Coal Mining Valley Fill Characteristics to Effluent Stream Quality
… age and construction method. We used electrical resistivity imaging (ERI) to investigate the subsurface structure of four valley fills in two dimensions. We combined ERI with artificial rainfall to investigate the location and transit time of hydrologic preferential infiltration flowpaths through …
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Electrical Resistivity Imaging of Preferenital Flow through Surface Coal Mine Valley Fills with Comparison to Other Land Forms
… We tested the effectiveness of electrical resistivity imaging (ERI) to monitor subsurface hydrologic flow paths in valley fills. ERI is a non-invasive geophysical inverse technique that maps spatiotemporal changes in resistivity of the subsurface. When a resistance or conductive change is …
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2-D and 3-D tools for electrical imaging in environmental applications
… of non-invasive methods, such as electrical resistivity and electromagnetic techniques. With the aim of improving the relationships between geophysical parameters and hydro-geological features of the subsoil, some innovative methods are proposed. In particular, being electrical resistivity …
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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 in three …
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Identification of surface water and groundwater relationship at Universiti Tun Hussein Onn Malaysia (UTHM) Campus
… The Schlumberger array was used for Electrical Resistivity Imaging (ERI) during data acquisition to identify potential shallow aquifers and suitable locations for boreholes which function as observation wells. Three new boreholes were installed and the ERI results showed that this area recorded …
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Fast imaging techniques of marine controlled source electromagnetic (CSEM) data
Obtaining information regarding the resistivity structure of the subsurface<br/>from marine CSEM data involves complex processes. 1D and 2D forward and inverse<br/>modelling are currently the standard approaches used to produce geoelectrical models,<br/>with 3D inversion fast becoming a realizable …
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Groundwater-surface water exchange within montane and alpine regions of the Front Range and Rocky Mountains, Colorado
… tests were paired with time-lapse electrical resistivity and modeled using OTIS to examine how solute transport and storage changed with decreasing stream discharge.