Developing Air Concentration and Velocity Probes for Measuring Highly-Aerated, High-Velocity Flow

by Kathleen H. Frizell, U.S. Bureau of Reclamation, Boise, United States,
David G. Ehler, U.S. Bureau of Reclamation, Boise, United States,
Brent W. Mefford, U.S. Bureau of Reclamation, Boise, United States,



Document Type: Proceeding Paper

Part of: Fundamentals and Advancements in Hydraulic Measurements and Experimentation

Abstract: The U.S. Bureau of Reclamation's stepped spillway overtopping protection research program required velocity and air concentration profile data be obtained during testing in a large, 15.2-m-high outdoor flume. Both velocity and air concentration profile measurements were needed to evaluate energy dissipation, bulking, and model/prototype correlation with a smaller indoor model. Measuring highly-aerated, high-velocity (12-17 m/s) flow is not practical using available instruments. Although air concentration measurement devices exist, most are custom made by researchers. As a result, two instruments were developed and calibrated by Reclamation to gather prototype data in our overtopping facility. The instrument development, calibration, and verification will be discussed.

Subject Headings: Flow measurement | Wave overtopping | Energy measurement | Calibration | Probe instruments | Velocity profile | Energy dissipation

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