Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hessd-11-8167-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
18 Jul 2014
Review status
This discussion paper is a preprint. It has been under review for the journal Hydrology and Earth System Sciences (HESS). The manuscript was not accepted for further review after discussion.
Limitations of fibre optic distributed temperature sensing for quantifying surface water groundwater interactions
H. Roshan1, M. Young1, M. S. Andersen1,2, and R. I. Acworth1,2 1Connected Waters Initiative Research Centre, University of New South Wales, 110 King St, Manly Vale, NSW 2093, Australia
2National Centre for Groundwater Research and Training, Sydney, Australia
Abstract. Studies of surface water–groundwater interactions using fiber optic distributed temperature sensing (FO-DTS) has increased in recent years. However, only a few studies to date have explored the limitations of FO-DTS in detecting groundwater discharge to streams. A FO_DTS system was therefore tested in a flume under controlled laboratory conditions for its ability to accurately measure the discharge of hot or cold groundwater into a simulated surface water flow. In the experiment the surface water (SW) and groundwater (GW) velocities, expressed as ratios (vgw/vsw), were varied from 0.21% to 61.7%; temperature difference between SW-GW were varied from 2 to 10 °C; the direction of temperature gradient were varied with both cold and-hot water injection; and two different bed materials were used to investigate their effects on FO_DTS's detection limit of groundwater discharge. The ability of the FO_DTS system to detect the discharge of groundwater of a different temperature in the laboratory environment was found to be mainly dependent upon the surface and groundwater flow velocities and their temperature difference. A correlation was proposed to estimate the groundwater discharge from temperature. The correlation is valid when the ratio of the apparent temperature response to the source temperature difference is above 0.02.
Citation: Roshan, H., Young, M., Andersen, M. S., and Acworth, R. I.: Limitations of fibre optic distributed temperature sensing for quantifying surface water groundwater interactions, Hydrol. Earth Syst. Sci. Discuss., 11, 8167-8190, https://doi.org/10.5194/hessd-11-8167-2014, 2014.
H. Roshan et al.

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