CGRG Bibliography of Canadian Geomorphology
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Author : Baines, C.D.
Date : 2001.
Title : Electrical resistivity ground imaging (ERGI): Field experiments to develop methods for investigating fluvial sediments.
Publication : Unpublished M.Sc. thesis. University of Calgary, Calgary, Alberta.
Issue :
Page(s) : 121 p.
Abstract
This research tested a new geophysical tool, electrical resistivity ground imaging (ERGI), to map lithology and geometry of buried fluvial deposits. ERGI uses measurements of the resistance of the ground to an electrical current to develop a 2D model of the shallow subsurface (<100 m). Research was conducted in spring 2001 on an anastomosing reach of the upper Columbia River, in southeastern B.C., Canada and in late summer 2001 on the Rhine-Meuse Delta, the Netherlands. ERGI surveys from 2 channel-fills and 2 crevasse-splays are presented and compared to lithostratigraphic profiles from sediment cores. Depth, width and lithology of sand channel-fills, crevasse-splays, and adjacent sediments can be accurately detected and delineated from the ERGI profiles, even when buried beneath 1–20 m of silt/clay. Methodology experiments examined combined open water and dry land ERGI surveys, assessed electrode arrays, and identified a previously unreported methodological problem: cumulative electrode charge-up.
Bibliography of Canadian Geomorphology