active-distributed temperature sensing; heterogeneity; hyporheic zone; lowland river; water fluxes variabilities; Active-distributed temperature sensing; Distributed temperature sensing; Flux variability; Heterogeneity; Hyporheic; Hyporheic zone; Lowland rivers; Streambeds; Water flux; Water flux variability; Water Science and Technology
Abstract :
[en] 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.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Simon, Nataline ; Université de Liège - ULiège > Urban and Environmental Engineering
Bour, O.; CNRS, Univ Rennes, Geosciences Rennes – UMR 6118, Rennes, France
Heyman, J. ; CNRS, Univ Rennes, Geosciences Rennes – UMR 6118, Rennes, France
Lavenant, N.; CNRS, Univ Rennes, Geosciences Rennes – UMR 6118, Rennes, France
Petton, C.; CNRS, Univ Rennes, Geosciences Rennes – UMR 6118, Rennes, France
Crave, A.; CNRS, Univ Rennes, Geosciences Rennes – UMR 6118, Rennes, France
Language :
English
Title :
Spatiotemporal Variability of Hyporheic Flow in a Losing River Section
Publication date :
2024
Journal title :
Water Resources Research
ISSN :
0043-1397
eISSN :
1944-7973
Publisher :
John Wiley and Sons Inc
Volume :
60
Issue :
6
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
AELB - Agence de l'eau Loire-Bretagne ANR - Agence Nationale de la Recherche
Funding text :
This work was supported by the Agence de l\u2019Eau Loire Bretagne and by the ANR project EQUIPEX CRITEX (Grant ANR-11-EQPX-0011). We warmly thank Mamadou Ndom for his support during the installation of the FO cable, as well as Kerry Gallagher for English corrections and his kind and insightful suggestions. We also sincerely thank the associate editor, Prof. Dr. Jan Fleckenstein, and three reviewers for their remarks and comments that greatly help to improve the manuscript.This work was supported by the Agence de l\u2019Eau Loire Bretagne and by the ANR project EQUIPEX CRITEX (Grant ANR\u201011\u2010EQPX\u20100011). We warmly thank Mamadou Ndom for his support during the installation of the FO cable, as well as Kerry Gallagher for English corrections and his kind and insightful suggestions. We also sincerely thank the associate editor, Prof. Dr. Jan Fleckenstein, and three reviewers for their remarks and comments that greatly help to improve the manuscript.
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