Evaluation of Transient Electromagnetic Soundings for Deep Detection of Conductive Fluids (Record no. 50707)

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Transcribing agency CICY
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Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-16537
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Title Evaluation of Transient Electromagnetic Soundings for Deep Detection of Conductive Fluids
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Volume/sequential designation Groundwater, 24(3), p.351-356, 1986
520 3# - SUMMARY, ETC.
Summary, etc. Transient 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
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Topical term or geographic name entry element AQUIFERS - FLORIDA
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Topical term or geographic name entry element DATA PROCESSING - DATA ACQUISITION
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Topical term or geographic name entry element HYDROLOGY
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Stewart, M.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Gay, M.C.
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Uniform Resource Identifier <a href="https://drive.google.com/file/d/1h9iwdaRAT9V2QEulUjMQuKRM1gOokfKz/view?usp=drivesdk">https://drive.google.com/file/d/1h9iwdaRAT9V2QEulUjMQuKRM1gOokfKz/view?usp=drivesdk</a>
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