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Anastomosing reach control on hydraulics and sediment distribution on the Sabie River, South Africa

Entwistle, Neil; Heritage, George; Tooth, Stephen; Milan, David

Authors

Neil Entwistle

George Heritage

Stephen Tooth



Abstract

Rivers in the Kruger National Park, South Africa, have variable degrees of bedrock and alluvial influence. Pre-2000 aerial imagery for the Sabie River (catchment area 6320 km2) reveals downstream alternations from alluvial single thread or braided, to bedrock anastomosed or mixed anastomosed channel types, with pool-rapids also present locally. In 2000 and 2012, extreme floods resulted in significant alluvial erosion, widely exposing the underlying bedrock. Since the 2012 flood, aerial LiDAR surveys reveal the strong gradient control exerted by the bedrock and mixed anastomosed channel types, which influences hydraulic conditions and sediment dynamics. Two dimensional hydraulic modelling of moderate floods (3500 m3 s−1), the bedrock or mixed anastomosed channel types are drowned out, resulting in dramatically increased velocities along the entire river and widespread alluvial stripping regardless of initial channel type or location.

Citation

Entwistle, N., Heritage, G., Tooth, S., & Milan, D. (2014). Anastomosing reach control on hydraulics and sediment distribution on the Sabie River, South Africa. Proceedings of the International Association of Hydrological Sciences, 367, 215-219. https://doi.org/10.5194/piahs-367-215-2015

Journal Article Type Article
Acceptance Date Dec 14, 2014
Online Publication Date Mar 3, 2015
Publication Date Jan 1, 2014
Deposit Date Apr 29, 2016
Publicly Available Date Mar 28, 2024
Journal Proceedings of the international association of hydrological sciences
Print ISSN 2199-8981
Publisher Copernicus Publications
Peer Reviewed Peer Reviewed
Volume 367
Pages 215-219
ISBN 9781907161452
DOI https://doi.org/10.5194/piahs-367-215-2015
Keywords Semi-arid river, 2D modelling, Anastomosing channels, Flood impact, Sabie River, South Africa
Public URL https://hull-repository.worktribe.com/output/437384
Publisher URL http://www.proc-iahs.net/367/215/2015/
Additional Information This is a copy of an open access article published in Proceedings of the international association of hydrological sciences, 2014, v.367.

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Copyright Statement
© Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License.





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