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| Titel |
Thermal-plume fibre optic tracking (T-POT) test for flow velocity measurement in groundwater boreholes |
| VerfasserIn |
T. Read, V. F. Bense, R. Hochreutener, O. Bour, T. Borgne, N. Lavenant, J. S. Selker |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2193-0856
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 4, no. 2 ; Nr. 4, no. 2 (2015-10-28), S.197-202 |
| Datensatznummer |
250115247
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| Publikation (Nr.) |
 copernicus.org/gi-4-197-2015.pdf |
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| Zusammenfassung |
| 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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