Monitoring groundwater fluxes variations through active-DTS measurements

Simon, Nataline; Bour, Olivier; Lavenant, Nicolas; Porel, Gilles; Nauleau, Benoît; Klepikova, Maria

doi:10.1016/j.jhydrol.2023.129755

Cited by 4 publications

(2 citation statements)

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“…Long heating periods (>4 hr) were used to ensure stable temperatures and accurate flux estimates. Finally, as Simon, Bour, Lavenant, et al (2023) showed that water fluxes variations over time may be monitored through Active-DTS measurements, we used longer heating periods (up to 52 hr) to monitor the possible effect of dam release, which induced rapid changes in stream level, on hyporheic flow. Further details about the method used for data interpretation can be found in Simon et al (2021) and .…”

Section: Theoretical Background For Data Interpretationmentioning

confidence: 99%

“…The method could be used to monitor the seasonal variability of water fluxes by repeating Water Resources Research 10.1029/2023WR035475 the surveys under different hydrological conditions. It could also be used for assessing diurnal variations of fluxes, because of evapotranspiration, or the effect of rainfall/flooding events on hyporheic fluxes (Simon, Bour, Lavenant, et al, 2023).…”

Section: Temporal Variability Of Fluxesmentioning

confidence: 99%

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Spatiotemporal Variability of Hyporheic Flow in a Losing River Section

Simon,

Bour,

Heyman

et al. 2024

Water Resources Research

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Characterizing the spatiotemporal variability of water fluxes at the stream‐groundwater interface is extremely challenging due to the lack of methods for estimating hyporheic flows at different scales. To address this, we demonstrate the potential of Active‐Distributed Temperature Sensing (DTS) methods for measuring and mapping hyporheic flow in a lowland stream. Experiments were conducted by burying a few hundred meters of heatable Fiber‐Optic cables within streambed sediments in a large meander, where permanent stream‐losing conditions are observed along the stream reach. We propose a new methodology to filter ambient temperature variations along the heated section of the DTS cable and to extend the application of Active‐DTS to losing streams. After data processing, the results show that, along lateral and longitudinal stream profiles, both thermal conductivity and water flux values follow normal distributions with relatively small standard deviations. Hyporheic fluxes vary by one order of magnitude. The absence of correlation between water fluxes within the hyporheic zone and streambed topography variations suggests that the variability is mainly controlled by local streambed heterogeneities. This means that the spatiotemporal variability of fluxes may be used as a marker of the variability of streambed hydraulic conductivities. The relatively low spatial variability (one order of magnitude) in hyporheic flow suggests a small variability of streambed properties. This is an important result for calibrating models assessing hyporheic processes, in which the hydraulic conductivity distribution is generally assumed. Additionally, measurements made over three years yield similar estimates showing the remarkable stability of hyporheic flows through time.

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Section: Theoretical Background For Data Interpretationmentioning

confidence: 99%

Section: Temporal Variability Of Fluxesmentioning

confidence: 99%

Spatiotemporal Variability of Hyporheic Flow in a Losing River Section

Simon,

Bour,

Heyman

et al. 2024

Water Resources Research

Self Cite

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Geophysics as a hypothesis‐testing tool for critical zone hydrogeology

Dumont,

Singha

2024

WIREs Water

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Geophysical methods have long been used in earth and environmental science for the characterization of subsurface properties. While imaging the subsurface opens the “black box” of subsurface heterogeneity, we argue here that these tools can be used in a more powerful way than characterization, which is to develop and test hypotheses. Critical zone science has opened new questions and hypotheses in the hydrologic sciences holistically around controls on water fluxes between surface, biological, and underground compartments. While groundwater flows can be monitored in boreholes, water fluxes from the atmosphere to the aquifer through the soil and the root system are more complex to study than boreholes can inform upon. Here, we focus on the successful application of various geophysical tools to explore hypotheses in critical zone hydrogeology and highlight areas where future contributions could be made. Specifically, we look at questions around subsurface structural controls on flow, the dimensionality and partitioning of those flows in the subsurface, plant water uptake, and how geophysics may be used to constrain reactive transport. We also outline areas of future research that may push the boundaries of how geophysical methods are used to quantify critical zone complexity.This article is categorized under: Water and Life > Nature of Freshwater Ecosystems Science of Water > Hydrological Processes Water and Life > Methods

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