A laboratory investigation of bed-load transport of gravel sediments under dam break flow

Dam break flows and resulting river bed erosion can have disastrous impacts on human safety, infrastructure, environmental quality. However, there is a lack of research the mobility non-uniform sediment mixtures from dam how these differ uniform sized sediment. In this paper, laboratory flume experiments revealed that coarse fine fractions in had higher lower bed-load parameter, respectively, than sediments same size. Thus, finer were more stable coarser erodible compared to uniform-grained bed. These differences be explained by hiding protrusion fractions, respectively. By investigating changes mixed-size with reservoir water levels, results at low when only just mobile, parameter was fractions. The opposite observed level, significant proportion coarsest mobilized. grains an important effect their relative grains. transported mixed-sized beds initial sediment, became increase level.