Experimental study of a positive surge. Part 2: comparison with literature theories and unsteady flow field analysis |
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Authors: | Carlo Gualtieri Hubert Chanson |
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Institution: | (1) Professor in Civil Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia |
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Abstract: | A positive surge is a unsteady open channel flow resulting from the rapid rise of the free-surface. The phenomenon may be
observed in water supply canals and channels as well as in some estuaries during spring tidal conditions. The formation and
development of positive surges can be predicted using the method of characteristics and shallow water equations. The paper
is the second part of a study presenting 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. Several experiments were conducted with the same initial discharge (Q = 0.060 m3/s) and six different gate openings after closure resulting in both non-breaking undular and breaking bores. A comparison
between main features of the undular surges with literature theories demonstrated that the experimental data were mostly in
agreement with Andersen’s theory. The analysis of unsteady flow field including Reynolds stresses confirmed and extended previous
findings about positive surge hydrodynamics. |
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