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The feasibility of using the transient electromagnetic sounding (TS or TDEM) method for groundwater expoloration can be studied by means of numerical models. As examples of its applicability to groundwater exploration, we study 4 groundwater exploration problems; 1) mapping of alluvial fill and gravel zones over bedrock; 2) mapping of sand and gravel lenses in till; 3) detection of salt or brackish water interfaces in freshwater aquifers; and 4) determination of hydrostratigraphy. The TS method is best suited for locating conductive targets, and has very good vertical resolution. Unlike other sounding techniques where the receiver-transmitter array must be expanded to sound more deeply, the depth of investigation for the TS method is a function of the length of time the transient is recorded. -from Authors
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Transient electromagnetic sounding for groundwater.