Trends in waterborne electrical and EM induction methods for high resolution sub-bottom imaging Karl E. Butler (University of New Brunswick) SUMMARY____________________________________________________________ Electrical and electromagnetic (EM) methods are used extensively for near-surface applications on land but their use on water remains relatively novel. Shallow water applications are becoming more common however as there has been growing recognition over the past five years of the useful information these methods can provide in groundwater hydrology sedimentology engineering and other fields. In many applications spatial variations in resistivity variations are useful as a proxy for variations in another bulk material property such as pore


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