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| Type: | Resource | |
| Storage: | The size of this resource is 60.9 MB | |
| Created: | Sep 14, 2021 at 9:13 a.m. | |
| Last updated: | Feb 02, 2022 at 8:01 p.m. (Metadata update) | |
| Published date: | Feb 02, 2022 at 8:01 p.m. | |
| DOI: | 10.4211/hs.90acd3c1c2754e839e1e12d73154eaff | |
| Citation: | See how to cite this resource |
| Sharing Status: | Published |
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| Views: | 1544 |
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Abstract
Previous modeling studies of hyporheic exchange induced by moving bedforms have used a Lagrangian frame of reference, typically a simulation domain that moves with an individual bedform. However, that approach is not suitable for simulating the exchange and accumulation of fine particles at a specific location by the migration of a series of bedforms, which commonly occurs in sand-bed streams. Here we present a novel simulation framework that represents mobile bedforms with a moving-interface domain and determines the resulting hyporheic transport using particle tracking. Simulation results successfully reproduce observations of clay deposition in sand beds, and the resulting development of a low-conductivity layer near the scour zone. Increased bedform celerity and filtration both lead to 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.
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