Bed Material and Numerical Modeling in a Gravel/Cobble Bed Stream

by Robert T. Milhous,
Russell A. Dodge,
Perry L. Johnson,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


The characteristics of bed material in a cobble or gravel river and their use for numerical simulation of flushing flow needs are discussed. There are three types of bed material: 1) material forming the protective surface of the river bed (armour), 2) material making up most of the stream bed (substrate), and 3) material on the surface of the armour at low flows (ephemeral bed material). Numerical models which consider the three types are used to obtain the flushing flow needs for a reach of the Gunnison River in western Colorado. Laboratory flume and field data are being collected to develop improvements to the basic concepts used in the calculation of the flushing flow need.

Subject Headings: Bed materials | River and stream beds | Numerical models | River flow | Flushing | Fluid flow | Rivers and streams | Colorado | United States

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