Data

 

We provide below the full data set used by Simon et al. (Water Resources Research, under review) corresponding to active-DTS measurements achieved in an experimental bench. The authors propose here two different and complementary interpretation methods for interpreting the temperature rise measured along a single fiber-optic cable used as a heat source and for monitoring temperature. The interpretation methods provide accurate estimate of both the thermal conductivity of the saturated porous media and the groundwater flow. The experimental data available here was used to validate the application of the methods and define its uncertainties and limits. A description of the experiment and of the general setup is available here.

 

Figure 1: Experimental setup showing the dimensions of the sandbox and the deployment of fiber optic cable [top view (x,y plane) and side view (x,y,z plane)]. The marks C1 and C2 represent connection points between fiber optic cable and electrical cables allowing the injection of electricity into the steel frame of the cable (Modified from Simon et al. (2020)).

 

The data was acquired in a lab at the University of Poitiers, which is part of the French network of hydrogeological observatories H+ (http://hplus.ore.fr/en/).  The data may be downloaded from the links below by creating a logging and a password on the H+ database at http://hplus.ore.fr/en/database/acces-database.

 

Fiber-optic DTS measurements

Fiber-optic Experimental Bench

Details about FO-DTS measurements

Experimental conditions

Temperature of the calibration baths

Control of the air temperature

Water system - Control of the temperature

Complementary temperature measurements in the sandbox

Independent Temperature probes (PT100) installed in the sandbox

 

 

Acknowledgments

 

Fundings: The experimentation and the collaboration between the University of Rennes 1 and the University of Poitiers benefited from the support of INSU-CNRS through the Service National d’Observation H+. These works were also funded by the Agence de l’Eau Loire Bretagne, by the ANR project EQUIPEX CRITEX, grant number ANR-11-EQPX-0011 and by the EC2CO program (HOTFLUX). The APC was funded by the Agence de l’Eau Loire Bretagne.

Collaborators:  Nataline SIMON1, Oliver BOUR1, Nicolas LAVENANT1, Gilles POREL2, Benoît NAULEAU2, Behzad POULADI1, Alain CRAVE1, Laurent LONGUEVERGNE1
1 Univ Rennes, CNRS, Géosciences Rennes - UMR 6118, 35000 Rennes, France.
2 Université de Poitiers, CNRS, UMR 7285 IC2MP, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France.

We also warmly thank Denis Paquet for helping us during the experimental work.

 

Complementary reference

 

Simon, N., Bour, O., Lavenant, N., Porel, G., Nauleau, B., Pouladi, B., & Longuevergne, L. (2020). A Comparison of Different Methods to Estimate the Effective Spatial Resolution of FO-DTS Measurements Achieved during Sandbox Experiments. Sensors, 20(2). https://doi.org/10.3390/s20020570