Author(s): Hubert Chanson
Linked Author(s): Hubert Chanson
Keywords: No Keywords
Abstract: During storm and flood events, large water bodies are released in storm waterways and spillways, and induce supercritical flows with air entrainment at the free surface. This self-aeration contributes to the air-water transfer of oxygen and nitrogen since air bubbles within the flow increases substantially the air- water interface area. This paper develops a method to estimate accurately the air-water surface area in self-aerated flows as a function of the hydraulic flow properties. The results are applied to channels of constant slopes, and show that the air-water interface area and the aeration efficiency are primarily function of the discharge per unit width.
Year: 1993