Effects of Air Entrainment on Plunge Pool Scour

作者：Peter J. Mason · 发表于：Journal of Hydraulic Engineering · 年份：1989 · DOI：10.1061/(asce)0733-9429(1989)115:3(385) · 被引用次数：68 · 研究领域：Hydrology and Sediment Transport Processes、Hydraulic flow and structures、Hydrology and Watershed Management Studies

Plunge pool scour depths are normally assumed to be dependent on unit flow q and head drop H, with a surprising variation among authors concerning the importance of H. It is hypothesized by the writer that this process may be linked to plunge pool air entrainment. Tests are carried out using a hydraulic model on which q, H and the air/water ratio β in the plunge pool could each be varied separately. Scour depths are found to depend only on q and β with the apparent effects of H recorded in the past being possibly due to associated variations of β with H. Equations are developed explaining the results in terms of forces on the particles of bed material. These are shown to apply to a wider body of model test data and also to prototype data. Particular areas of relevant future research are also identified. It is proposed that any future plunge pool scour studies should recognize air entrainment as a significant variable.