Guan, M, Ahilan, S, Wright, N et al. (1 more author) (2015) Modelling long-term sediment deposition in a river floodplain during continues flood events. In: Geophysical Research Abstracts. European Geosciences Union General Assembly 2015, 12-17 Apr 2015, Vienna Austria. Copernicus
Abstract
River floodplains act as a form of storage during high discharges in a river. As a floodplain generally has a lower energy environment, sediment aggradation commonly occurs over the period of time, which will reduce the overall storage capacity of the floodplain. Also, in a river system sediments are generally considered as the carrier of pesticides and metal contamination from the upstream catchment. Hence, studying sediment deposition in a floodplain is not only helpful for local flood risk assessment, but also can improve our understanding of the dispersion of contaminants associated with the transfer of sediment between a river and its floodplain. This study adopts a recently updated two-dimensional hydro-morphodynamic model based on the full shallow water equations to model a long-term spatial migration of Johnson Creek, Portland, Oregon and its floodplain. The 500-year, 100-year, 50- year, 10-year, as well as the recorded flood events during 1941-2014 were simulated. Suspended load with three grain-sizes was transported to the river along with the floods. The results indicate that about 30 - 45% of total sediment load is deposited in the floodplain for the studied return period floods. The spatial distribution and amount of short and long-term sediment deposition on the floodplain is demonstrated, and the resulting potential loss of flood storage capacity is analysed and discussed.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Author(s) 2014. CC Attribution 3.0 License. |
Keywords: | Floodplain; Hydro-morphodynamic mode; Contaminant dispersion |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) > Inst for Pathogen Control Engineering (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) > Institute for Resilient Infrastructure (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 May 2015 12:56 |
Last Modified: | 19 Dec 2022 13:31 |
Published Version: | http://meetingorganizer.copernicus.org/EGU2015/EGU... |
Status: | Published |
Publisher: | Copernicus |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:85581 |