A Novel Framework for Simulating Particle Deposition With Moving Bedforms
Teitelbaum Y. Shimony T. Saavedra Cifuentes E. Dallmann J. Phillips C.B. Packman A.I. Hansen S.K. Arnon S.
28 February 2022John Wiley and Sons Inc
Geophysical Research Letters
2022#49Issue 4
Previous modeling studies of hyporheic exchange induced by moving bedforms have used a moving reference frame, typically corresponding to an individual moving bedform. However, this approach is not suitable for simulating the exchange and accumulation of immobile fine particles beneath moving bedforms, which commonly occurs in sand-bed streams, as both moving and stationary features must be considered. Here we present a novel simulation framework that may represent arbitrarily shaped, generally aperiodic mobile bedforms within a stationary reference frame. We combine this approach with particle tracking to successfully reproduce observations of clay deposition in sand beds, and the resulting development of a low-conductivity layer near the scour zone. We find that increased bedform celerity and filtration both lead to a shallower depth of clay deposition and a more compact deposition layer. While increased filtration causes more clay to deposit, increased celerity reduces deposition by flattening hyporheic exchange flowpaths.
Eulerian reference frame , Hyporheic exchange , Migrating bedforms , Mobile bedforms , Moving boundary model , Particle deposition
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Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Beersheba, Israel
Civil and Environmental Engineering, Northwestern University, Evanston, IL, United States
Mechanical Engineering, Northwestern University, Evanston, IL, United States
Center for Preparatory Studies, Nazarbayev University, Astana, Kazakhstan
Civil and Environmental Engineering, Utah State University, Logan, UT, United States
Zuckerberg Institute for Water Research
Civil and Environmental Engineering
Mechanical Engineering
Center for Preparatory Studies
Civil and Environmental Engineering
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