IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 4: Responding to Shifting Water Resources : Non-intrusive measuring of air-water flow properties in self-aerated stepped spillway flow
Non-intrusive measuring of air-water flow properties in self-aerated stepped spillway flow
Author : D.B. Bung1
For hydraulic design of stepped spillways, knowledge of flow properties as flow depth and velocity of the air-water mixture is essential. Generally, these parameters are measured on largescale models by use of an intrusive probe (i.e. double-tip conductivity or fiber-optical probe) and scaled to prototype dimensions. In this paper the capability and limitation of non-intrusive measuring devices are analysed by comparison with a large model data set measured with a double-tip conductivity probe in skimming flow regime. In fact, flow depths are measured with an ultrasonic sensor and velocity fields are determined by use of a modified high-speed PIV method (Bubble Image Velocimetry). The results indicate that non-intrusive devices may be applied for a first estimation of flow properties with sufficient accuracy. The flow field above the pseudo-bottom and within the cavity of the steps can be visualized in high resolution.
File Size : 8,415,488 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 4: Responding to Shifting Water Resources
Date Published : 01/07/2011
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