Influence of a sloping bed on the sediment transport direction

Abstract

From Struiksma et al (1985) it can be concluded that more experimental evidence is needed to achieve a correct formulation. Generally the available data can only be used for an integral check as, for instance, was done by Zimmerman and Kennedy· ( 1978). More useful information could be obtained by carrying out experiments directed at the individual components. The first experimental attempts in straight flumes to study the influence of the sloping bed component alone were carried out by Freds6e (1978) and Wan (1981). However, they did not arrive at uniform conditions in the experiments and therefore the interpretation of the results was difficult. In addition, the range of flow conditions used was relatively small. The experiments presented in this report can be considered as a continuation of these experiments. Much attention was paid to the establishment of uniform conditions in the flume and a wide range of flow conditions has been used. The present experiments were carried out in a straight flume under prevailing bed load conditions in which insignificant grain sorting took place. Before the start of each experiment a constant transverse sloping bed profile and a constant longitudinal bed slope were prepared over the entire length of the flume. The influence of the transverse sloping bed profile on the direction of the sediment transport was determined from the experiments by means of the first-order solution of the set of equations, which describe the tilting of the transverse bed profile as a function of time