Instability of Bed-Surface Composition Due to Sorting Process in a Stream Composed of Sand and Gravel

by Tetsuro Tsujimoto, Kanazawa Univ, Japan,

Document Type: Proceeding Paper

Part of: Sediment Transport Modeling


Wavy patterns of sorting are often observed in a stream composed of sand and gravel, and they are regarded as instability of bed-surface composition due to selective bed-load transport for each grain size. In this paper, formation mechanism of longitudinally alternate sorting is formulated as a linear instability problem with a specially prepared non-equilibrium bed-load transport law for each grain size of graded materials. The theory clarifies the possibility of formation of longitudinal wavy pattern of sorting propagating downstream and its predominant wave length.

Subject Headings: Rivers and streams | Sand (hydraulic) | Sandy soils | Gravels | Grain (material) | Granular materials | Surface waves | Soil analysis

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