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Free-Surface and Seepage Bubbly Flows on a Gabion Stepped Spillway Weir: Experimental Observations

Author(s): Gangfu Zhang; Hubert Chanson

Linked Author(s): Hubert Chanson

Keywords: Gabion stepped spillways; Seepage flow; Air-water flow; Physical modelling

Abstract: Gabion stepped spillways are presented as a viable option for low to medium head designs. The material contributes to stability, low cost, flexibility, porosity and noise reduction. The steps also enhance energy dissipation, and reduce the requirement of a stilling basin. This paper constitutes a systematic study of the free-surface and seepage bubbly flows using a combination of phase-detection probe and high-speed video camera. The two-phase flow properties and turbulence characteristics in the free-surface flow were documented. The bubbly motion through the gabion material was analysed. The results demonstrated evidence of strong air-water mixing between the free-surface and seepage flows, and highlighted a modified cavity flow pattern as a result.

DOI:

Year: 2015

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