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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/hess-2020-288
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2020-288
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  06 Jul 2020

06 Jul 2020

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This preprint is currently under review for the journal HESS.

How does daily groundwater table drawdown affect the diel rhythm of hyporheic exchange?

Liwen Wu1,2, Jesus D. Gomez-Velez3,4, Stefan Krause5,6, Anders Wörman7, Tanu Singh5,a, Gunnar Nützmann1,2, and Jörg Lewandowski1,2 Liwen Wu et al.
  • 1Department of Ecohydrology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany
  • 2Geography Department, Humboldt-University, Berlin, Germany
  • 3Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN, USA
  • 4Department of Earth & Environmental Sciences, Vanderbilt University, Nashville, TN, USA
  • 5School of Geography, Earth and Environmental Sciences, University of Birmingham, UK
  • 6LEHNA-Laboratory of Ecology of Natural and Man-Impacted Hydrosystems, University Claude Bernard Lyon 1, Lyon, France
  • 7Division of River Engineering, KTH-Royal Institute of Technology, Stockholm, Sweden
  • anow at: Department of Numerical Mathematics, Technical University of Munich, Garching, Germany

Abstract. Groundwater table dynamics extensively modify the volume of the hyporheic zone and the rate of hyporheic exchange processes. Understanding the effects of daily groundwater table fluctuations on the tightly coupled flow and heat transport within hyporheic zones is crucial for water resources management. With this aim in mind, a physically based model is used to explore hyporheic responses to varying groundwater table fluctuation scenarios. Effects of different timing and amplitude of groundwater table daily drawdowns under gaining and losing conditions are explored in hyporheic zones influenced by natural flood events and diel river temperature fluctuations. We find that both diel river temperature fluctuations and daily groundwater table drawdowns play important roles in determining the spatiotemporal variability of hyporheic exchange rates, temperature of exfiltrating hyporheic fluxes, mean residence times, and hyporheic denitrification potentials. Groundwater table dynamics present substantially distinct impacts on hyporheic exchange under gaining or losing conditions. The timing of groundwater withdrawal has a direct influence on hyporheic exchange rates and hyporheic buffering capacity on thermal disturbances. Consequently, the selection of aquifer pumping regimes has significant impacts on the dispersal of pollutants in the aquifer and thermal heterogeneity in the sediment.

Liwen Wu et al.

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Liwen Wu et al.

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Short summary
With a physically based model that couples flow and heat transport in hyporheic zones, the present study provides first insights into dynamics hyporheic responses to impacts of daily groundwater withdrawal and river temperature fluctuations, allowing for a better mechanistic understanding on transient hyporheic exchange processes and hence an improved pumping operational scheme.
With a physically based model that couples flow and heat transport in hyporheic zones, the...
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