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Experiments in Fluids

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01-06-2011 | Research Article

Velocity-field measurements in a dam-break flow using a PTV Voronoï imaging technique

Authors: R. Aleixo, S. Soares-Frazão, Y. Zech

Published in: Experiments in Fluids | Issue 6/2011

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Abstract

A dam-break flow is an example of an extremely transient free-surface flow with various time and space scales. The importance of studying this type of flow is directly connected with the risk assessment of a dam and with the effects of such a catastrophe on human activities in the valley downstream. In this paper, an experimental study of the dam-break flow is presented. While a great part existing studies about dam-break flows are focused on variables such as the water-front velocity and the water level, the present paper is focused on the measurement of velocity profiles over the whole flow depth within the dam-break wave. For such study and due to the characteristics of the flow itself, image acquisition techniques were used. The velocity field was obtained by means of a Particle Tracking Velocimetry (PTV) algorithm based on Voronoï patterns’ matching. A comparison with the application of a PIV algorithm to the raw data is provided. Finally, results for the velocity profiles and water elevation are presented and discussed for two different flow conditions.

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Title: Velocity-field measurements in a dam-break flow using a PTV Voronoï imaging technique
Authors: R. Aleixo
S. Soares-Frazão
Y. Zech
Publication date: 01-06-2011
Publisher: Springer-Verlag
Published in: Experiments in Fluids / Issue 6/2011
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-010-1021-y

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