Abstract
This paper presents a dataset obtained from fifty-two laboratory experiments of nappe oscillations on free overfall structures. Data were collected on two complementary experimental setups, each consisting of a linear weir model. The dataset covers test configurations involving varied geometric parameters (i.e. weir crest shape, weir width, fall height and nappe confinement) and inflow discharges. The following experimental data were produced: assessment of nappe oscillation occurrence and associated frequencies. The later measurements were performed using characterization techniques (image and sound analysis) developed for this research. Reuse of the collected data will support efforts to improve the understanding of the physical processes underpinning nappe oscillation and to validate numerical modelling of the phenomenon.
Highlights
Background & SummaryFree-overfall structures are commonly used as flow control structures for a variety of open channel/free surface flow applications including irrigation, water treatment, and dam safety
Nappe oscillations may lead to structural issues if one of the dominant nappe oscillation frequencies is close to the natural frequency of the structure[9]
The headbox was supplied by two pumps delivering up to 0.25 m3/s through two perforated pipes parallel to the crest and located on the bottom of the reservoir
Summary
Background & SummaryFree-overfall structures (such as weirs and crest gates) are commonly used as flow control structures for a variety of open channel/free surface flow applications including irrigation, water treatment, and dam safety. This spectrum provided an image of the sound level for each frequency of the noise generated by the nappe cascading downstream from the weir.
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