Journal article
How daily groundwater table drawdown affects the diel rhythm of hyporheic exchange
Hydrology and earth system sciences, Vol.25(4), pp.1905-1921
04/09/2021
DOI: 10.5194/hess-25-1905-2021
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. The 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 table drawdown 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.
Details
- Title: Subtitle
- How daily groundwater table drawdown affects the diel rhythm of hyporheic exchange
- Creators
- Liwen Wu - Humboldt-Universität zu BerlinJesus D. Gomez-Velez - Vanderbilt UniversityStefan Krause - University of BirminghamAnders Worman - KTH Royal Institute of TechnologyTanu Singh - University of BirminghamGunnar Nuetzmann - Leibniz Inst Freshwater Ecol & Inland Fisheries I, Dept Ecohydrol, Berlin, GermanyJoerg Lewandowski - Leibniz Inst Freshwater Ecol & Inland Fisheries I, Dept Ecohydrol, Berlin, Germany
- Resource Type
- Journal article
- Publication Details
- Hydrology and earth system sciences, Vol.25(4), pp.1905-1921
- DOI
- 10.5194/hess-25-1905-2021
- ISSN
- 1027-5606
- eISSN
- 1607-7938
- Publisher
- Copernicus Gesellschaft Mbh
- Number of pages
- 17
- Grant note
- 734317 / Marie Curie Actions (MSCA); Marie Curie Actions GRK 2032/1 / German Research Foundation (DFG) U.S. Department of Energy, Office of Biological and Environmental Research (BER), as part of BER's Subsurface Biogeochemistry Research Program (SBR); United States Department of Energy (DOE) 641939; 734317 / European Union; European Union (EU) NE/R014752/1 / NERC; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) EAR 1830172; OIA-2020814 / U.S. National Science Foundation; National Science Foundation (NSF) WO671/11-1 / German Research Foundation; German Research Foundation (DFG)
- Language
- English
- Date published
- 04/09/2021
- Academic Unit
- Civil and Environmental Engineering
- Record Identifier
- 9984962532202771
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