Journal article
Unifying Advective and Diffusive Descriptions of Bedform Pumping in the Benthic Biolayer of Streams
Water resources research, Vol.56(11), p.n/a
11/2020
DOI: 10.1029/2020WR027967
Abstract
Many water quality and ecosystem functions performed by streams occur in the benthic biolayer, the biologically active upper (similar to 5 cm) layer of the streambed. Solute transport through the benthic biolayer is facilitated by bedform pumping, a physical process in which dynamic and static pressure variations over the surface of stationary bedforms (e.g., ripples and dunes) drive flow across the sediment-water interface. In this paper we derive two predictive modeling frameworks, one advective and the other diffusive, for solute transport through the benthic biolayer by bedform pumping. Both frameworks closely reproduce patterns and rates of bedform pumping previously measured in the laboratory, provided that the diffusion model's dispersion coefficient declines exponentially with depth. They are also functionally equivalent, such that parameter sets inferred from the 2D advective model can be applied to the 1D diffusive model, and vice versa. The functional equivalence and complementary strengths of these two models expand the range of questions that can be answered, for example, by adopting the 2D advective model to study the effects of geomorphic processes (such as bedform adjustments to land use change) on flow-dependent processes and the 1D diffusive model to study problems where multiple transport mechanisms combine (such as bedform pumping and turbulent diffusion). By unifying 2D advective and 1D diffusive descriptions of bedform pumping, our analytical results provide a straightforward and computationally efficient approach for predicting, and better understanding, solute transport in the benthic biolayer of streams and coastal sediments.
Details
- Title: Subtitle
- Unifying Advective and Diffusive Descriptions of Bedform Pumping in the Benthic Biolayer of Streams
- Creators
- Stanley B. Grant - Virginia TechAhmed Monofy - Polytechnic University of TurinFulvio Boano - Polytechnic University of TurinJesus D. Gomez-Velez - Vanderbilt UniversityIan Guymer - University of SheffieldJudson Harvey - United States Geological SurveyMarco Ghisalberti - The University of Western Australia
- Resource Type
- Journal article
- Publication Details
- Water resources research, Vol.56(11), p.n/a
- DOI
- 10.1029/2020WR027967
- ISSN
- 0043-1397
- eISSN
- 1944-7973
- Publisher
- Amer Geophysical Union
- Number of pages
- 21
- Grant note
- 1840504; 1830172 / U.S. NSF; National Science Foundation (NSF) MRP17-455083 / UC Office of the President EP/P012027/1 / EPSRC; UK Research & Innovation (UKRI); Engineering & Physical Sciences Research Council (EPSRC) Geological Survey Water Availability and Use Science Program U.S. DOE Biological and Environmental Research (Subsurface Biogeochemistry Research Program); United States Department of Energy (DOE) Compagnia di San Paolo award; Compagnia di San Paolo EP/P012027/1 / U.K. EPSRC Established Career Fellowship; UK Research & Innovation (UKRI); Engineering & Physical Sciences Research Council (EPSRC) DP120102500 / Australian Research Council (ARC) Discovery Projects funding scheme; Australian Research Council Virginia Tech's ICTAS EFO Opportunity Seed Investment Grant 1830172 / Division Of Earth Sciences; Directorate For Geosciences; National Science Foundation (NSF); NSF - Directorate for Geosciences (GEO)
- Language
- English
- Date published
- 11/2020
- Academic Unit
- Civil and Environmental Engineering
- Record Identifier
- 9984962627702771
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