河床波の発達性状に関する実験的考察

Abstract

In non-equilibrium alluvial phenomena a strong interaction between the bed configurationsand the sediment motion plays an important role. As a typical event of the transport of bed loadsediment, the evolution of sand waves from an initially flattened bed was observed here by exper-iments. The time variation of stochastic properties of undulated beds was investigated. Theprocess of evolution of sand waves was described by a simplified kinematic model coupled withsome statistical techniques and verified by the experimental results. Furthermore, the distri-butions of the step length and rest period of sand movement over a duned bed were obtainedfrom bed profiled data, and the sediment transport rate calculated by use of these quantitiesshowed a fairly good agreement with the experimental results.