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090			_aB-16537
245	1	0	_aEvaluation of Transient Electromagnetic Soundings for Deep Detection of Conductive Fluids
490	0		_vGroundwater, 24(3), p.351-356, 1986
520	3		_aTransient electromagnetic sounding methods (TEM)have several advantages over DC resistivity soundings. The principal advantage is that sounding depths several times the receiver-transmitter spacing can be achieved, resulting in less cumbersome field work and more flexible sounding site selection. The TEM method was tested using a commercially available instrument (Geonics EM-37)in the Gulf Springs region of west-central Florida to locate the saltwater interface in the Floridan Aquifer. The Floridan is a thick (200 m), unconfined, karstic, carbonate aquifer within the study area. High annual rainfall and internal drainage create a deep and dynamic interface. Eighty transient soundings were completed in 18 field days. Seventy-one soundings used a square 80 m × 80 m transmitter loop, and the other nine used a 160 m × 160 m coil. The interface was easily detected from a minimum depth of 60 m to its maximum depth of about 140 meters. Also, a high-resistivity, low-porosity zone was detected at depths ranging from 180-250 meters. The TEM data compare well with available chloride concentration data. The TEM interface corresponds to chloride values in excess of 200-400 mg/1. The sounding curves obtained suggest that with presently available instruments the TEM method is not well-suited for shallow soundings (less than 40-50 meters). Copyright © 1986, Wiley Blackwell. All rights reserved
650	1	4	_aAQUIFERS - FLORIDA
650	1	4	_aDATA PROCESSING - DATA ACQUISITION
650	1	4	_aHYDROLOGY
700	1	2	_aStewart, M.
700	1	2	_aGay, M.C.
856	4	0	_uhttps://drive.google.com/file/d/1h9iwdaRAT9V2QEulUjMQuKRM1gOokfKz/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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