Characteristics of Self-Aerated Flows

Two-phase air-water flows in hydraulic jumps at low Froude number: Similarity, scale effects and the need for field observations

“…Altogether, the results showed that the bubble sizes were not scaled based upon the geometric scaling ratio for a Froude similitude. The finding was consistent with some seminal literature on air-water flows [54,70,11].…”

Hydraulic Jump on a Partially Vegetated Bed

“…Vegetation growing on the channel bed represents a common flow barrier that introduces both form drag and friction resistance to the flowing water, inducing a hydraulic jump as the supercritical flow runs into the vegetation canopy and is forced to decelerate. The change in flow regime and the associated air entrainment can cause a number of hydraulic and environmental impacts from reduction in flood passage capacity to varied flow and fluid properties such as sediment carrying capacity, air‐water mixture density, and dissolved oxygen content (Chanson, 1997; Kobus, 1984; Rao & Kobus, 1974; Wood, 1985, 1991). The flow deceleration alleviates downstream bed scouring and aids nutrient deposition, while the rise in the water level and propagation of surface waves may require reconsideration of downstream bank protection.…”

Intrusive and non-intrusive two-phase air-water measurements on stepped spillways: A physical study

“…The use of dual-tip phase-detection probes [10] enabled more reliable measurements, and has been most common in self-aerated flows [18]. Rao and Kobus [39], Falvey [26], Wood [45] and Chanson [16] provided some overview of the developments and applications.…”