Bed load transport on arbitrarily sloping bed at low Shields stress: preliminary experimental observations

摘要

Bagnold hypothesis is one of the fundamental assumption of many bed load transport model. However the failure of the Bagnold hypothesis has been recently demonstrated. Based on this result an alternative model has been proposed by Parker et al. (2003) for the evaluation of bed load transport on arbitrarily sloping bed at low Shields stress. In this work an experimental study to investigate the effect of relevant slopes on dynamics of bed load transport, motion characteristics and transport dynamics of bed particles is carried out. Experimental equipment and preliminary observations are presented and discussed in the context of verifying the theoretical findings of Parker, Seminara, Solari (2003).