Abstract. Data compiled from eight decades of incipient motion studies were used to calculate dimensionless critical shear stress values of the median grain size, t*c50. Calculated t*c50 values were stratified by initial motion definition, median grain size type (surface, subsurface, or laboratory mixture), relative roughness, and flow regime. A traditional Shields plot constructed from data th...

This paper presents an experimental approach to study the phenomena of segregating water and gravel using a large ball mill device that reproduces segregation under debris flow. First, experiment was conducted in various conditions: mixing, bed velocity, laid roughness. The occurrence conditions mixing are categorized compared with each other and/or without roughness on bed. Furthermore, moveme...

Detailed field measurements and simulations of three-dimensional flow structure were used to develop a conceptual model to explain the sustainability of self-formed pool-riffle sequences in gravel-bed rivers. The analysis was conducted at the Red River Wildlife Management Area in Idaho, USA, and enabled characterization of the flow structure through two consecutive pool-riffle sequences, includ...