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Communication Dans Un Congrès Année : 2020

Temporal variability of bidirectional seiching in an open-channel

Résumé

This paper presents laboratory results in which the free surface oscillations that are caused by the interaction between an open-channel flow and a lateral cavity are measured. For a square cavity with a side length equal to the width of the main stream, this oscillation phenomenon, named seiching, can result in standing waves in both the transverse and longitudinal direction for the same flow case. This bidirectional aspect of seiching is confirmed by the current results using a Fourier transform of the surface registrations in both the cavity and the main channel area. More importantly, a wavelet analysis in the time and frequency domains shows that bidirectional seiching is not a stationary phenomenon since the wavelet power of the two observed seiching modes varies significantly in time. Therefore, a more time-localised approach is used, which reveals that the entire measurement period can be subdivided in time windows where only one of the two seiching modes is considerably excited.
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Dates et versions

hal-03832540 , version 1 (27-10-2022)

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Copyright (Tous droits réservés)

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  • HAL Id : hal-03832540 , version 1

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L. Engelen, Clément Perrot-Minot, Emmanuel Mignot, Nicolas Riviere, T. de Mulder. Temporal variability of bidirectional seiching in an open-channel. 10th Conference on Fluvial Hydraulics, River Flow 2020, Jul 2020, Virtual, Online, France. ⟨hal-03832540⟩
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