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Thermal-plume fibre optic tracking (T-POT) test for flow velocity measurement in groundwater boreholes

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https://ir.library.oregonstate.edu/concern/articles/g158bn70h

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  • We develop an approach for measuring in-well fluid velocities using point electrical heating combined with spatially and temporally continuous temperature monitoring using distributed temperature sensing (DTS). The method uses a point heater to warm a discrete volume of water. The rate of advection of this plume, once the heating is stopped, equates to the average flow velocity in the well. We conducted thermal-plume fibre optic tracking (T-POT) tests in a borehole in a fractured rock aquifer with the heater at the same depth and multiple pumping rates. Tracking of the thermal plume peak allowed the spatially varying velocity to be estimated up to 50 m downstream from the heating point, depending on the pumping rate. The T-POT technique can be used to estimate the velocity throughout long intervals provided that thermal dilution due to inflows, dispersion, or cooling by conduction does not render the thermal pulse unresolvable with DTS. A complete flow log may be obtained by deploying the heater at multiple depths, or with multiple point heaters.
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  • Read, T., Bense, V., Bour, O., Le Borgne, T., Lavenant, N., Hochreutener, R., & Selker, J. S. (2015). Thermal-Plume fibre Optic Tracking (T-POT) test for flow velocity measurement in groundwater boreholes. Geoscientific Instrumentation, Methods and Data Systems, 4(2), 197-202. doi:10.5194/gi-4-197-2015
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  • 4
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  • 2
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  • Funding for this work was provided by INTERREG IV project CLIMAWAT, the national network of hydrogeological sites H+, 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 fibre optic cables were provided by the Center for Transformative Environmental Monitoring Programs (CTEMPs) funded by the National Science Foundation.
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