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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

G. Heritage

S. Tooth

Neil Entwistle

George Heritage

Stephen Tooth

Dr David Milan D.Milan@hull.ac.uk
Senior Lecturer in Physical Geography; Programme Director BSc Physical Geography and Geography; Employability Officer

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 (<1500 m3 s−1) reveals reduced velocities upstream of bedrock or mixed anastomosed channel types, which promotes deposition. During more extreme 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.

Journal Article Type Article
Publication Date Jan 1, 2014
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
Institution 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
DOI https://doi.org/10.5194/piahs-367-215-2015
Keywords Semi-arid river, 2D modelling, Anastomosing channels, Flood impact, Sabie River, South Africa
Publisher URL http://www.proc-iahs.net/367/215/2015/
Copyright Statement © Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License.
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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