BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:SMART: Progress towards an optimising time-lapse geoelectrical ima
 ging system - Wilkinson\, PB (British Geological Survey (BGS))
DTSTART:20110722T090000Z
DTEND:20110722T100000Z
UID:TALK32124@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Electrical resistivity tomography (ERT) is a widely-used geoph
 ysical technique for shallow subsurface investigations and monitoring. A r
 ange of automatic multi-electrode ERT systems\, both commercial and academ
 ic\, are routinely used to collect resistivity data sets that cover large 
 survey areas at high spatial and temporal density. But despite the flexibi
 lity of these systems\, the data still tend to be measured using tradition
 al arrangements of electrodes. Recent research by several international gr
 oups has highlighted the possibility of using automatically generated surv
 ey designs which are optimised to produce the best possible tomographic im
 age resolution given the limitations of time and practicality required to 
 collect and process the data. Here we examine the challenges of applying a
 utomated ERT survey design to real experiments where resistivity imaging i
 s being used to monitor subsurface processes. Using synthetic and real exa
 mples we address the problems of avoiding electrode polarisation effects\,
  making efficient use of multiple simultaneous measurement channels\, and 
 making optimal measurements in noisy environments. These are essential ste
 ps towards implementing SMART (Sensitivity-Modulated Adaptive Resistivity 
 Tomography)\, a robust self-optimising ERT monitoring system. We illustrat
 e the planned design and operation of the SMART system using a simulated t
 ime-lapse experiment to monitor a saline tracer. The results demonstrate t
 he improvements in image resolution that can be expected over traditional 
 ERT monitoring.\n
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR