Document Detail

Geophysical monitoring and evaluation of coastal plain aquifers.
MedLine Citation:
PMID:  14763617     Owner:  NLM     Status:  MEDLINE    
We use time domain electromagnetic (TDEM) soundings to monitor ground water conditions beneath the coastal plain in eastern North Carolina. The TDEM method measures the earth's response to an induced electromagnetic field. The resulting signal is converted, through a complex inversion process, to apparent resistivity values, which can be directly correlated to borehole resistivity logs. TDEM soundings are used to map the interface between fresh and salt water within coastal aquifers, and estimate depth to basement when siting new monitoring wells. Focused TDEM surveys have identified areas of salt water encroachment caused by high volumes of discharge from local supply wells. Electromagnetic sounding, when used in tandem with the state's network of monitoring wells, is an accurate and inexpensive tool for evaluating fresh water/salt water relationships on both local and regional scales within coastal plain aquifers.
Lewis A Land; Jeff C Lautier; Nathaniel C Wilson; Gabrielle Chianese; Steven Webb
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ground water     Volume:  42     ISSN:  0017-467X     ISO Abbreviation:  Ground Water     Publication Date:    2004 Jan-Feb
Date Detail:
Created Date:  2004-02-06     Completed Date:  2004-05-06     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9882886     Medline TA:  Ground Water     Country:  United States    
Other Details:
Languages:  eng     Pagination:  59-67     Citation Subset:  IM    
New Mexico Bureau of Geology & Mineral Resources, Carlsbad, NM 88220, USA.
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MeSH Terms
Electromagnetic Phenomena
Environmental Monitoring / methods*
North Carolina
Sensitivity and Specificity
Water Movements
Water Supply*
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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