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Biological controls on siltation in gravel bed rivers, Centre for Ecology and Hydrology, UK
Supervisory team: Dr P Rameshwaran (Centre for Ecology & Hydrology, ponr@ceh.ac.uk), Dr Gareth Old (Centre for Ecology & Hydrology, gho@ceh.ac.uk), Dr Gustavo de Almeida (Engineering and the Environment University of Southampton, g.dealmeida@soton.ac.uk) and Professor Paul Kemp (Engineering and the Environment University of Southampton, P.Kemp@soton.ac.uk) 
 
The student will be registered at the University of Southampton and hosted at Centre for Ecology & Hydrology (Wallingford). 
 
Siltation of river beds by fine sediment is a major factor affecting the ecological status of UK rivers. Yet fundamental questions remain relating to the process of siltation and the link with fine sediment delivery to water courses, particularly in the context of agricultural diffuse pollution. CEH has completed a major field based study of siltation in rivers across the UK and this has raised some interesting questions regarding the linkage to sediment inputs. In particular, it is essential to develop a better understanding of the controls on the rates of siltation (e.g. importance of river sediment load versus concentration, effective distance downstream, effect of biota and/or calibre of substrate). 
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