|Title||Recent AEM case study examples using a Full Waveform time-domain system for near-surface applications|
|Author||Prikhodko, A; Legault, J M; Kwan, K; Eadie, T; Oldenborger, G A; Sapia, V; Viezzoli, A; Gloaguen, E; Smith, B D; Best, M E|
|Source||Proceeding of the Symposium on the Application of Geophysics to Environmental and Engineering Problems (SAGEEP); 2013 p. 1-10|
|Alt Series||Earth Sciences Sector, Contribution Series 20120360|
|Meeting||Symposium on the Application of Geophysics to Environmental and Engineering Problems (SAGEEP); Denver; US; March 17-21, 2013|
|Province||Manitoba; Ontario; Quebec; British Columbia|
|Area||Spiritwood; Timiskaming; St. Lawrence Lowlands; Montérégie; Horn River; Nebraska Sand Hills; Canada; United States|
|Subjects||geophysics; hydrogeology; electromagnetic fields; electromagnetic mapping; e m surveys; groundwater; aquifers; Spiritwood Valley Aquifer; Timiskaming Kimberlite Field; Yamaska-Richelieu watershed; Horn
|Program||Aquifer Assessment & support to mapping, Groundwater Geoscience|
|Abstract||A new time-domain design implementation for the VTEM helicopter time-domain EM system, known as "Full-waveform" VTEM, addresses the early time issues that have been limiting its shallow mapping
capability for near-surface applications.|
The Full-waveform design implementation consists of a combination of a) streamed half-cycle recording of transmitter and receiver waveform data, as well as b) continuous system calibration corrections, b)
parasitic-noise and transmitter-drift corrections, and d) ideal-waveform-deconvolution corrections that are applied in a separate post-processing step. This leads to an improvement in usable early time data from ~100usec in standard VTEM systems to
~20usec for Full waveform VTEM. This results in a vastly improved near-surface hydrogeologic characterization.
The Full-waveform system and theory were previously described by Legault et al. (2012). This paper presents VTEM case-study examples
with emphasis on near-surface applications.