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Active-Distributed Temperature Sensing to continuously quantify vertical flow in boreholes

Abstract : We show how a distributed borehole flowmeter can be created from armored Fiber Optic cables with the Active-Distributed Temperature Sensing (A-DTS) method. The principle is that in a flowing fluid, the difference in temperature between a heated and unheated cable is a function of the fluid velocity. We outline the physical basis of the methodology and report on the deployment of a prototype A-DTS flowmeter in a fractured rock aquifer. With this design, an increase in flow velocity from 0.01 to 0.3 m s21 elicited a 2.5 C cooling effect. It is envisaged that with further development this method will have applications where point measurements of borehole vertical flow do not fully capture combined spatiotemporal dynamics.
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https://hal-insu.archives-ouvertes.fr/insu-01005138
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Submitted on : Thursday, June 12, 2014 - 9:10:15 AM
Last modification on : Friday, April 5, 2019 - 8:22:48 PM
Long-term archiving on: : Tuesday, April 11, 2017 - 6:44:10 AM

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T. Read, Olivier Bour, J. S. Selker, V. Bense, Tanguy Le Borgne, et al.. Active-Distributed Temperature Sensing to continuously quantify vertical flow in boreholes. Water Resources Research, American Geophysical Union, 2014, 50 (5), pp.3706-3713. ⟨10.1002/2014WR015273⟩. ⟨insu-01005138⟩

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