Influence of Roughness on Velocity and Dispersion at Low Flow

by Vahid Alavian, Univ of Illinois at, Urbana-Champaign, Dep of Civil, Engineering, Urbana, IL, USA,

Document Type: Proceeding Paper

Part of: Water for Resource Development

Abstract: Dependence of the hydraulic and transport characteristics of low flow on channel roughness is investigated. Empirical expressions are used to estimate roughness coefficient as a function of local depth and bed material size. Transverse velocity distribution and longitudinal dispersion coefficient are taken as criteria for comparison. Results of analysis in three Illinois streams show favorable comparison between predicted and measured velocity distribution. Dispersion coefficients computed from the velocity profiles are also compared.

Subject Headings: Hydraulic roughness | Channel flow | Fluid velocity | Low flow | Velocity distribution | Flow measurement | Flow profiles | Streamflow | Water flow | Bed materials | North America | Illinois | United States

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