混合砂れき床面の粗粒化過程について

Abstract

The transport process of sediment mixtures is essentially unequilibrium and conseque-ntly are observed typical alluvial phenomena, for example armoring. In such a case, itis not reasonable to apply the bed load transport formulae derived under equilibriumconditions but the description of the phenomena should be based on the characteristicsof individual sediment motion. In this paper, unequilibrium processes that appear inalluvial beds composed of sediment mixtures are described reasonably by using the conc-epts of sediment pick-up rate and step length. And some additional considerations aregiven on reference to the results of numerical calculations based on the model derivedhere. Furthermore, an experiment on the armor coat formation was conducted and itsresults are discussed.