Journal article
Impact of Flow Alteration and Temperature Variability on Hyporheic Exchange
Water resources research, Vol.56(3), p.n/a
03/2020
DOI: 10.1029/2019WR026225
Abstract
Coupled groundwater flow and heat transport within hyporheic zones extensively affect water, energy, and solute exchange with surrounding sediments. The local and cumulative implications of this tightly coupled process strongly depend on characteristics of drivers (i.e., discharge and temperature of the water column) and modulators (i.e., hydraulic and thermal properties of the sediment). With this in mind, we perform a systematic numerical analysis of hyporheic responses to understand how the temporal variability of river discharge and temperature affect flow and heat transport within hyporheic zones. We identify typical time series of river discharge and temperature from gauging stations along the headwater region of Mississippi River Basin, which are characterized by different degrees of flow alteration, to drive a physics-based model of the hyporheic exchange process. Our modeling results indicate that coupled groundwater flow and heat transport significantly affects the dynamic response of hyporheic zones, resulting in substantial differences in exchange rates and characteristic time scales of hyporheic exchange processes. We also find that the hyporheic zone dampens river temperature fluctuations increasingly with higher frequency of temperature fluctuations. This dampening effect depends on the system transport time scale and characteristics of river discharge and temperature variability. Furthermore, our results reveal that the flow alteration reduces the potential of hyporheic zones to act as a temperature buffer and hinders denitrification within hyporheic zones. These results have significant implications for understanding the drivers of local variability in hyporheic exchange and the implications for the development of thermal refugia and ecosystem functioning in hyporheic zones.
Details
- Title: Subtitle
- Impact of Flow Alteration and Temperature Variability on Hyporheic Exchange
- Creators
- Liwen Wu - Leibniz Institute of Freshwater Ecology and Inland FisheriesJesus D. Gomez-Velez - Vanderbilt UniversityStefan Krause - University of BirminghamTanu Singh - University of BirminghamAnders Wörman - KTH Royal Institute of TechnologyJörg Lewandowski - Leibniz Institute of Freshwater Ecology and Inland Fisheries
- Resource Type
- Journal article
- Publication Details
- Water resources research, Vol.56(3), p.n/a
- DOI
- 10.1029/2019WR026225
- ISSN
- 0043-1397
- eISSN
- 1944-7973
- Grant note
- U.S. Department of Energy (http://data.elsevier.com/vocabulary/SciValFunders/100000015) Pacific Northwest National Laboratory (http://data.elsevier.com/vocabulary/SciValFunders/100011661) EAR 1830172 / National Science Foundation (100000001) Biological and Environmental Research (http://data.elsevier.com/vocabulary/SciValFunders/100006206) Leibniz-Institut für Gewässerökologie und Binnenfischerei (http://data.elsevier.com/vocabulary/SciValFunders/501100013656) GRK 2032/1 / Deutsche Forschungsgemeinschaft (501100001659) SBR Scientific Focus Area NE/R014752/1 / Natural Environment Research Council (http://data.elsevier.com/vocabulary/SciValFunders/501100000270) National Forestry and Grassland Administration (http://data.elsevier.com/vocabulary/SciValFunders/501100007825) 641939; 734317 / Horizon 2020 (http://data.elsevier.com/vocabulary/SciValFunders/501100007601)
- Language
- English
- Date published
- 03/2020
- Academic Unit
- Civil and Environmental Engineering
- Record Identifier
- 9984962530702771
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