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For more than a decade, habitat mapping using biotopes (in‐channel hydraulically‐defined habitats) has underpinned aquatic conservation in the UK through (a) providing baseline information on system complexity and (b) allowing environmental and ecological change to be monitored and evaluated. The traditional method used is the subjective river habitat or corridor survey. This has recently been revised...
There is much debate over the role of hydraulic 'reversal' in the maintenance of riffle-pool sequences in gravel-bed channels. It is, however, generally acknowledged that the pool has the greatest maximum energy during flood flows allowing scour and pool maintenance. Little emphasis has been placed on the reversal period in many previous studies despite its potential importance being noted in the...
The effects of the February 2000 extreme flood (6000-7000 m 3 s -1 , 200 year return period flow) on channel morphology are examined over 108 km of the semiarid bedrock-influenced Sabie River, South Africa. The river is incised into bedrock forming a macrochannel with a planform that is fixed over the timescale of change being investigated. Within the confines of the macrochannel,...
High resolution data on spatial and temporal variability in flow hydraulics and sediment transport within riffle-pool sequences are required to improve understanding of how fluvial processes maintain these meso-scale bedforms. This paper addresses this issue by providing velocity and boundary shear stress data over a range of discharges from base flow (0.07 m 3 s -1 ) to just...
The existence of a channel-forming, 'dominant' or 'bankfull' discharge has been applied, with some success, to a variety of alluvial river systems in temperate areas. This paper presents the results of an investigation into the relationship between flow magnitude and frequency, and the geomorphological units of the Sabie River in the Mpumalanga Province, South Africa. The river is perennial, however,...
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