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

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https://ir.library.oregonstate.edu/concern/articles/5q47rt542

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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 s⁻¹ 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.
  • Keywords: Fiber optics, A-DTS, Flowmeter, Heated, Borehole
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  • Read, T., O. Bour, J. S. Selker, V. F. Bense, T. Le Borgne, R. Hochreutener, and N. Lavenant (2014), Active-Distributed Temperature Sensing to continuously quantify vertical flow in boreholes. Water Resources Research, 50, 3706–3713. doi:10.1002/2014WR015273
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  • 50
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  • 5
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  • Funding for this work was provided by the INTERREG IV project CLIMAWAT, the national network of hydrogeological sites H1, the ANR project CRITEX ANR-11-EQPX-0011, and a Natural Environment Research Council (NERC) studentship (NE/J500069/1) to Tom Read. Part of the support for the participation of John Selker and provision of some of the fiber optic cables were provided by the Center for Transformative Environmental Monitoring Programs (CTEMPs) funded by the National Science Foundation.
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