Self-Aerated Flows on Chutes and Spillways

In open channel flows an important design parameter is the amount of entrained air. The presence of air within the flow increases the bulk of the flow but also increases the transfer of atmospheric gases (e.g. oxygenation of river). Further aeration of high-velocity flows may prevent or reduce cavitation damage. This paper describes a general method to compute the flow characteristics of self-aerated flows. Firstly the uniform flow characteristics are summarized. Then the basic equations for gradually varied aerated flows are developed using the same method as WOOD (1985). The results are discussed and compared with several experimental data, and practical applications to self-aerated flows and tunnel spillway flow are presented.

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