Yan, N orcid.org/0000-0003-1790-5861, Colombera, L orcid.org/0000-0001-9116-1800 and Mountney, NP orcid.org/0000-0002-8356-9889 (2021) Evaluation of Morphodynamic Controls on the Preservation of Fluvial Meander-belt Deposits. Geophysical Research Letters, 48 (16). e2021GL094622. ISSN 0094-8276
Abstract
The way river morphodynamics influence the preservation of point-bar deposits at multiple scales is not fully understood. Employing time-lapse trajectories of natural rivers, a numerical model is used here to simulate planform evolutions of meander-belt reaches that embody different transformation behaviors and cutoff processes. Proxies for temporal durations are obtained considering the surface area over which a river migrated and channel migration rates that relate to average channel radius of curvature through constant, monotonic, and non-monotonic relationships. The preservation of meander-belt deposits over different timescales is assessed at three architectural hierarchies: (a) pairs and (b) sets of accretion packages, and (c) meander-belts. Results confirm that sediment preservation decreases in a predictable way with the accumulation time; however, accretion rates decay with time in a way that does not follow the expected power-law. This is interpreted to reflect the effect of the onset of geomorphic thresholds of channel transformation and cutoff.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021. American Geophysical Union. All Rights Reserved. This is the version of record of the following article: Yan, N., Colombera, L., & Mountney, N. P. (2021). Evaluation of morphodynamic controls on the preservation of fluvial meander-belt deposits. Geophysical Research Letters, 48, e2021GL094622. , which has been published in final form at https://doi.org/10.1029/2021GL094622. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. |
Keywords: | river morphodynamics; point bar; accretion rate; sediment preservation; stratigraphic completeness; numerical model |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 10 Aug 2021 12:27 |
Last Modified: | 28 Feb 2022 01:38 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1029/2021GL094622 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:176823 |