caa a22 4500 445874511 CHVBK 20180317145523.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10652-011-9222-3 doi (NATIONALLICENCE)springer-10.1007/s10652-011-9222-3 Experimental study of a positive surge. Part 2: comparison with literature theories and unsteady flow field analysis [Elektronische Daten] [Carlo Gualtieri, Hubert Chanson] 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 = 0.060m3/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. Springer Science+Business Media B.V., 2011 Environmental hydraulics nationallicence Positive surge nationallicence Surge front nationallicence Free surface measurements nationallicence Instantaneous velocity field nationallicence Physical modeling nationallicence Undular surges analysis nationallicence Unsteady flow field nationallicence Reynolds stresses nationallicence Gualtieri Carlo Department of Hydraulic, Geotechnical and Environmental Engineering (DIGA), University of Napoli "Federico II”, Via Claudio 21, 80125, Napoli, Italy aut Chanson Hubert School of Civil Engineering, The University of Queensland, 4072, Brisbane, QLD, Australia aut Environmental Fluid Mechanics Springer Netherlands 11/6(2011-12-01), 641-651 1567-7419 11:6<641 2011 11 10652 https://doi.org/10.1007/s10652-011-9222-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10652-011-9222-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gualtieri Carlo Department of Hydraulic, Geotechnical and Environmental Engineering (DIGA), University of Napoli "Federico II”, Via Claudio 21, 80125, Napoli, Italy aut NATIONALLICENCE 700 1- Chanson Hubert School of Civil Engineering, The University of Queensland, 4072, Brisbane, QLD, Australia aut NATIONALLICENCE 773 0- Environmental Fluid Mechanics Springer Netherlands 11/6(2011-12-01), 641-651 1567-7419 11:6<641 2011 11 10652 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer