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 2: Coastal Hydraulics: Form and Function : Hydrodynamics and turbulence in positive surges. a comparative study
Hydrodynamics and turbulence in positive surges. a comparative study
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A positive surge results from a sudden change in flow that increases the depth. It is the unsteady flow analogy of the stationary hydraulic jump and a geophysical application is the tidal bore. Positive surges are commonly studied using the method of characteristics and the Saint-Venant equations. The paper presents the results from new experimental investigations conducted in a large rectangular channel. Detailed unsteady velocity measurements were performed with a high temporal resolution using acoustic Doppler velocimetry and non-intrusive free-surface measurement devices. Two series of data were collected with a horizontal bed slope, a constant flow rate (Q=0.060 m/s) and two different downstream gate openings after closure, which resulted in undular (non-breaking) and in breaking bores, respectively. The analysis of undular free-surface profiles revealed a good agreement with previous both theoretical and experimental studies. Unsteady flow turbulence analysis revealed some significant patterns in streamwise and transverse velocities.
File Size : 3,379,211 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 2: Coastal Hydraulics: Form and Function
Date Published : 01/07/2011
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