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

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

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: Apr 29, 2016
• 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.
• Contract Date: Apr 29, 2016