Macro-Roughness Effects on Stream Reaeration

by Douglas B. Moog, (M.ASCE), Cornell Univ, Ithaca, United States,
Gerhard H. Jirka, (M.ASCE), Cornell Univ, Ithaca, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: The gas transfer coefficient is key to modeling dissolved oxygen levels in streams. Engineers commonly predict it as a function of mean flow depth, velocity, and slope. Large errors are common. A set of laboratory studies investigating reaeration under different resistance regimes explains one source of natural variability, and supports a physically-based predictive equation incorporating bed roughness.

Subject Headings: Hydraulic roughness | Channel flow | Dissolved oxygen | Rivers and streams | Fluid flow | Gas flow | Turbulent flow | Oxygen transfer

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