Abstract
Quantification of time-varying groundwater flow in boreholes in fractured crystalline rock using long-term distributed temperature sensing
Highlights
Quantification of groundwater flow is an important factor for several applications, such as water supply, boreholes for energy extraction/storage and drainage and flood prevention projects
In this study, distributed temperature sensing (DTS) with fibre-optics has been combined with energy calculations to estimate the time-varying groundwater flow in fractures in four stand-alone boreholes at Åkneset in Norway
One example of how long-time measurements enhance this understanding is that they provide information about the sources of the groundwater flow: For some fractures, the groundwater estimations showed no correlation with meteorological data, indicating that these fractures are fed from deeper regional flow, with relatively large response times
Summary
Karoline Husevåg Kvalsvik, Randi Kalskin Ramstad, Henrik Holmberg & Kirsti Midttømme. & Midttømme, K., 2022: Quantification of time-varying groundwater flow in boreholes in fractured crystalline rock using long-term distributed temperature sensing. In this study, distributed temperature sensing (DTS) with fibre-optics has been combined with energy calculations to estimate the time-varying groundwater flow in fractures in four stand-alone boreholes at Åkneset in Norway. Groundwater quantification is done by applying an energy balance similar to that of Read et al (2013) but adding the temporal change and conductive terms to see if there is time variation in the groundwater flow and if conduction is truly negligible Another important difference from the work of Read et al (2013) is that the proposed method avoids both pumping and thermal injection as this may disturb the natural groundwater flow.
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