Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Richard Ogilvy"'
Autor:
M.H. Loke, Jonathan Chambers, Richard Ogilvy, Oliver Kuras, David Gunn, Paul Wilkinson, Philip Meldrum
Publikováno v:
Geophysical Journal International. 189:428-440
The use of optimised resistivity tomography surveys to acquire field data imposes extra constraints on the design strategy beyond maximising the quality of the resulting tomographic image. In this paper, methods are presented to 1) minimise electrode
Publikováno v:
Journal of Geophysics and Engineering. 8:487-497
Several measurement arrangements involving different electrode arrays are considered for the case of single borehole-to-surface ERT surveys. Synthetic data tests indicate that standard measuring and inversion techniques can result in reconstructed im
Autor:
Jonathan Chambers, Oliver Kuras, Richard Ogilvy, Jonathan R. Ford, A.L. Weller, David Gunn, Catherine Pennington, Paul Wilkinson, Peter Hobbs, Philip Meldrum
Publikováno v:
Geomorphology. 125:472-484
A geoelectrical investigation of a slow moving earth slide–earth flow in Lower Jurassic Lias Group rocks of the Cleveland Basin, UK, is described. These mudrock slopes are particularly prone to failure and are a major source of lowland landslides i
Publikováno v:
Geophysical Journal International. 183:543-556
If electrodes move during geoelectrical resistivity monitoring and their new positions are not incorporated in the inversion, then the resulting tomographic images exhibit artefacts that can obscure genuine time-lapse resistivity changes in the subsu
Publikováno v:
Journal of Applied Geophysics. 62:324-337
Hidden mineshafts located in urban areas are a significant problem across much of the industrialized world. Electrical resistivity tomography (ERT) is a technique that can detect and characterize hidden mine entries by exploiting resistivity contrast
Publikováno v:
Journal of Environmental and Engineering Geophysics. 11:213-221
Cross-borehole electrical resistivity tomography was used to detect and image a concealed air-filled mineshaft at a greenfield test site. The measurement configurations and panel combinations were selected using a two-stage optimization process. An o
Publikováno v:
GEOPHYSICS. 71:G135-G152
Capacitive resistivity (CR) is an emerging geophysical technique designed to extend the scope of the conventional methodology of dc resistivity to environments where galvanic coupling is notoriously difficult to achieve — for example, across engine
Autor:
Jonathan Chambers, Richard Ogilvy, Paul Wilkinson, Philip Meldrum, Christopher J. Mellor, Simon Caunt
Publikováno v:
Journal of Environmental and Engineering Geophysics. 10:381-389
We present a comparison of the abilities of Electrical Resistivity Tomography (ERT) and Self-Potential Tomography (SPT) to detect and characterize buried mineshafts at the site of a former colliery. Surface electrical resistivity and self-potential (
Publikováno v:
Near Surface Geophysics. 3:81-92
Electrical impedance tomography (EIT) was used to characterize two tar pits, containing a range of NAPL and aqueous contaminants, located within a former quarry site. The site, which is situated on Coal Measures strata near Belper, Derbyshire, UK, ha
Publikováno v:
Journal of Environmental and Engineering Geophysics. 7:11-18
Electrical Resistivity Tomography (ERT) has been used to map the 3D spatial distribution of waste and leachate concentrations within a closed and unconfined landfill. Borehole sampling and a 2D ERT survey down-gradient of the landfill boundary had fa