Characterizing groundwater flow and heat transport in fractured rock using fiber‐optic distributed temperature sensing

Read, T.; Bour, Olivier; Bense, Victor; Borgne, Tanguy Le; Goderniaux, Pascal; Klepikova, Maria; Hochreutener, Rébecca; Lavenant, Nicolas; Boschero, V.

doi:10.1002/grl.50397

Cited by 123 publications

(105 citation statements)

References 25 publications

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“…Applications vary from temperature profiling of the subsurface: borehole observations (Freifeld et al, 2008), soils (Ciocca et al, 2012;Jansen et al, 2011;Sayde et al, 2010;Steele-Dunne et al, 2010); water: estuaries (Henderson et al, 2009), surface/groundwater (Lowry et al, 2007;Mamer and Lowry, 2013), solar ponds , streams (Selker et al, 2006;Vogt et al, 2010;Westhoff et al, 2007Westhoff et al, , 2011 and lakes (Vercauteren et al, 2011;van Emmerik et al, 2013); rocks (Read et al, 2013), ice caves (Curtis and Kyle, 2011), forests (Krause et al, 2013) and infrastructure: dam surveillance (Dornstadter, 1998), sewers , electric transmission cables (Yilmaz and Karlik, 2006) and gas pipelines (Tanimola and Hill, 2009).…”

Section: Introductionmentioning

confidence: 99%

Fiber optic distributed temperature sensing for the determination of air temperature

2015

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Abstract. This paper describes a method to correct for the effect of solar radiation in atmospheric distributed temperature sensing (DTS) applications. By using two cables with different diameters, one can determine what temperature a zero diameter cable would have. Such a virtual cable would not be affected by solar heating and would take on the temperature of the surrounding air. With two unshielded cable pairs, one black pair and one white pair, good results were obtained given the general consensus that shielding is needed to avoid radiation errors (WMO, 2010). The correlations between standard air temperature measurements and air temperatures derived from both cables of colors had a high correlation coefficient (r 2 = 0.99) and a RMSE of 0.38 • C, compared to a RMSE of 2.40 • C for a 3.0 mm uncorrected black cable. A thin white cable measured temperatures that were close to air temperature measured with a nearby shielded thermometer (RMSE of 0.61 • C). The temperatures were measured along horizontal cables with an eye to temperature measurements in urban areas, but the same method can be applied to any atmospheric DTS measurements, and for profile measurements along towers or with balloons and quadcopters.

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Section: Introductionmentioning

confidence: 99%

Fiber optic distributed temperature sensing for the determination of air temperature

2015

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“…Large screened intervals enabled them to use vertical temperature profiles as an indicator of vertical heterogeneity in the aquifer and of inflows from fractures and porous media. Read et al [131] performed heat transport tests in fractured media using DTS for temperature monitoring in injection and pumping wells. They monitored thermal dilution tests to detect cross-flowing fractures and assess the cross flow rate.…”

Section: Using Dts To Measure Temperaturementioning

confidence: 99%

Geophysical Methods for Monitoring Temperature Changes in Shallow Low Enthalpy Geothermal Systems

Hermans

Nguyen

Robert³

et al. 2014

Energies

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Low enthalpy geothermal systems exploited with ground source heat pumps or groundwater heat pumps present many advantages within the context of sustainable energy use. Designing, monitoring and controlling such systems requires the measurement of spatially distributed temperature fields and the knowledge of the parameters governing groundwater flow (permeability and specific storage) and heat transport (thermal conductivity and volumetric thermal capacity). Such data are often scarce or not available. In recent years, the ability of electrical resistivity tomography (ERT), self-potential method (SP) and distributed temperature sensing (DTS) to monitor spatially and temporally temperature changes in the subsurface has been investigated. We review the recent advances in using these three methods for this type of shallow applications. A special focus is made regarding the petrophysical relationships and on underlying assumptions generally needed for a quantitative interpretation of these geophysical data. We show that those geophysical methods are mature to be used within the context of temperature monitoring and that a combination of them may be the best choice regarding control and validation issues. OPEN ACCESSEnergies 2014, 7 5084

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“…Mostly hot water is infiltrated in an injection well, and BTCs are recorded in one or more downstream observation well (Ma et al, 2012;Macfarlane et al, 2002;Palmer et al, 1992;Read et al, 2013;Wagner et al, 2014;Wildemeersch et al, 2014). Insight into aquifer heterogeneity is not well constrained by analysis of thermal signals introduced and measured over long screens.…”

Section: Introductionmentioning

confidence: 99%

Travel-time-based thermal tracer tomography

Somogyvári

Bayer

Brauchler

2016

Hydrol. Earth Syst. Sci.

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Abstract. Active thermal tracer testing is a technique to get information about the flow and transport properties of an aquifer. In this paper we propose an innovative methodology using active thermal tracers in a tomographic setup to reconstruct cross-well hydraulic conductivity profiles. This is facilitated by assuming that the propagation of the injected thermal tracer is mainly controlled by advection. To reduce the effects of density and viscosity changes and thermal diffusion, early-time diagnostics are used and specific travel times of the tracer breakthrough curves are extracted. These travel times are inverted with an eikonal solver using the staggered grid method to reduce constraints from the predefined grid geometry and to improve the resolution. Finally, non-reliable pixels are removed from the derived hydraulic conductivity tomograms. The method is applied to successfully reconstruct cross-well profiles as well as a 3-D block of a high-resolution fluvio-aeolian aquifer analog data set. Sensitivity analysis reveals a negligible role of the injection temperature, but more attention has to be drawn to other technical parameters such as the injection rate. This is investigated in more detail through model-based testing using diverse hydraulic and thermal conditions in order to delineate the feasible range of applications for the new tomographic approach.

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Characterizing groundwater flow and heat transport in fractured rock using fiber‐optic distributed temperature sensing

Cited by 123 publications

References 25 publications

Fiber optic distributed temperature sensing for the determination of air temperature

Fiber optic distributed temperature sensing for the determination of air temperature

Geophysical Methods for Monitoring Temperature Changes in Shallow Low Enthalpy Geothermal Systems

Travel-time-based thermal tracer tomography

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