Show simple item record Rebecca A. en_US Keith en_US James en_US 2011-07-04T11:45:10Z 2011-07-04T11:45:10Z 2011-07-04 en_US
dc.identifier.citation Hodge , R A , Richards , K & Brasington , J 2011 , ' A physically-based bedload transport model developed for 3-D reach-scale cellular modelling ' Geomorphology , pp. 244-262 . en_US
dc.identifier.other PURE: 168864 en_US
dc.identifier.other dspace: 2160/7124 en_US
dc.description.abstract A bedload transport model is outlined which aims to provide a more physically-based description of bed surface and bedload grain-size distributions (GSDs) than existing empirical bedload models, but is simple enough to be incorporated in a reduced-complexity modelling framework. One motivation for this is the increasing need for 3-D models of decadal, reach-scale channel and floodplain evolution for use in river management. The computational demands of simulation at these scales mean that the appropriate models are necessarily of the reduced-complexity type. The bedload model is derived through analysis of sediment beds created using a discrete element model. These beds are “eroded” using a probabilistic entrainment algorithm which predicts the bedload GSD. There are two parts to the bedload model. The first identifies a functional relationship between the applied shear stress and the fraction of the bed undergoing active transport, while the second uses this fraction, in conjunction with the surface GSD, to produce a bedload GSD. The model produces bedload coarsening as shear stress increases from a value of one to a value of five times a reference shear stress. This model is tested in a series of numerical experiments, applied using a simple cellular model of a straight flume, which is run in both recirculation and feed modes. In both modes, the equilibrium GSDs of the bedload and surface are consistent with expected flume behaviour, suggesting that the model provides a reasonable reproduction of sediment entrainment, transport and sorting. en_US
dc.format.extent 19 en_US
dc.relation.ispartof Geomorphology en_US
dc.title A physically-based bedload transport model developed for 3-D reach-scale cellular modelling en_US
dc.contributor.pbl Institute of Geography & Earth Sciences en_US
dc.contributor.pbl River Basin Dynamics and Hydrology en_US

Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search Cadair

Advanced Search