Water Resources Research

Autor: Jesus D. Gomez-Velez, Stanley B. Grant, Fulvio Boano, Marco Ghisalberti, Ian Guymer, Ahmed Monofy, Judson W. Harvey
Přispěvatelé: Civil and Environmental Engineering, Center for Coastal Studies
Rok vydání: 2020
Předmět:
Zdroj: Water Resources Research. 56
ISSN: 1944-7973
0043-1397
DOI: 10.1029/2020wr027967
Popis: 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. U.S. NSFNational Science Foundation (NSF) [1840504, 1830172]; Virginia Tech's ICTAS EFO Opportunity Seed Investment Grant; UC Office of the President [MRP17-455083]; Compagnia di San Paolo awardCompagnia di San Paolo; U.S. DOE Biological and Environmental Research (Subsurface Biogeochemistry Research Program)United States Department of Energy (DOE); U.K. EPSRC Established Career FellowshipEngineering & Physical Sciences Research Council (EPSRC) [EP/P012027/1]; Australian Research Council (ARC) Discovery Projects funding schemeAustralian Research Council [DP120102500]; Geological Survey Water Availability and Use Science Program Funding included U.S. NSF (1840504), Virginia Tech's ICTAS EFO Opportunity Seed Investment Grant, and UC Office of the President (MRP17-455083) awards to S. B. G.; a Compagnia di San Paolo award to A. M. and F. B.; a U.S. NSF (1830172) and U.S. DOE Biological and Environmental Research (as part of the Subsurface Biogeochemistry Research Program) award to J. G.; a U.K. EPSRC Established Career Fellowship (EP/P012027/1) to I. G.; an Australian Research Council (ARC) Discovery Projects funding scheme (DP120102500) to M. G.; and support from the Geological Survey Water Availability and Use Science Program to J. H. The authors thank Andrea Bottacin-Busolin, two anonymous reviewers, and the Associate Editor for their helpful review of the manuscript, E. Gee and L. Grant for assistant with Figures 1 and 7, respectively, and M. Rippy and S. Bhide for edits. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Databáze: OpenAIRE
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