Author(s): T. B. Hoey; G. Pender; C. Fuller

Linked Author(s):

Keywords: No Keywords

Abstract: There has recently been considerable interest in the bedload transport of graded INTRODUCTION sediment mixtures in field, flume and simulation studies (e.g.Parker, 1990; Wathen et al., 1995; Wilcock and McArdell, 1993). Most of studies have been in equilibrium or aggrading situations, and there has been little work on sediment transport during degradation. Understanding of this case is restricted to descriptions of the general decline in transport rate through time (Tait et al, 1992: Proffitt and Sutherland, 1983) and of the dynamics of surface coarsening (e.g Sutherland, 1987). There have been few attempts to use bedload size distributions to inform about armouring processes, although Gomez (1994) illustrates the potential scope of this approach. Further studies of degradation and associated surface coarsening are important because degradation is an important process itself, and also because they can provide insights into the development of coarse surface layers under less controlled conditions. The present experimental programme addresses these issues, and examines the impacts of overbank flows on sediment transport and surface coarsening. This paper considers three inbank degradation experiments 4, 5 and 6, with slopes of 0.0026, 0.0029 and 0.0024.

DOI:

Year: 1997