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Measurements by geomagnetic induction of volume transport in a salt marsh drainage channel 1, 2
Author(s) -
Sanford Thomas B.
Publication year - 1977
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1977.22.6.1082
Subject(s) - salt marsh , earth's magnetic field , calibration , volume (thermodynamics) , drainage , seawater , electromagnetic induction , environmental science , flow (mathematics) , channel (broadcasting) , water transport , soil science , hydrology (agriculture) , geology , mechanics , water flow , magnetic field , electromagnetic coil , physics , geotechnical engineering , oceanography , electrical engineering , thermodynamics , engineering , quantum mechanics , biology , ecology
Volume transport of seawater through a salt marsh drainage channel is obtained by geomagnetic induction. The electric potential difference across the channel is interpreted in terms of water motion through the vertical component of the earth’s magnetic field. A model is formulated relating volume transport to induced potential differences and a salt bridge technique described for measuring the weak voltages. Calibration requires independent measurements of the volume transport. Using surface flow, rather than volume transport, for calibration results in method errors as large as 25%. Calibration against directly measured volume transport would reduce these errors.