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| DOI | Trouver le DOI : https://doi.org/10.1016/j.jhydrol.2025.133543 |
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| Auteur | Rechercher : Yu, Qingcheng1Identifiant ORCID : https://orcid.org/0000-0002-1245-9498; Rechercher : Rennie, Colin D.1; Rechercher : Ferguson, Sean2Identifiant ORCID : https://orcid.org/0000-0001-8007-9211; Rechercher : Provan, Mitchel2Identifiant ORCID : https://orcid.org/0000-0002-0882-5272 |
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| Affiliation | - Université d'Ottawa
- Conseil national de recherches Canada. Génie océanique, côtier et fluvial
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| Bailleur de fonds | Rechercher : National Research Council Canada; Rechercher : China Scholarship Council; Rechercher : Natural Sciences and Engineering Research Council of Canada |
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| Format | Texte, Article |
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| Sujet | river; surface Velocity; Particle Image Velocimetry (PIV); Particle Tracking Velocimetry (PTV); low tracer density; algorithm |
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| Résumé | The incapability of processing river surface flow velocities under low tracer density conditions is one of the limitations of the traditional Large-Scale Particle Image Velocimetry (LSPIV). This study developed a new LSPIV post-processing algorithm, Time Frequency Analysis (TiFA), to overcome such a limitation, enhance computational efficiency, and improve the accuracy of derived velocities. TiFA investigates the temporal joint distribution pattern of two velocity components at each location. By assuming that the valid velocities follow a quasi-normal distribution in the velocity time series, TiFA can quickly and accurately separate the valid velocities from background noise and outliers. The performance of TiFA was evaluated by comparing with other algorithms including Traditional LSPIV, Ensemble Correlation (EC), Large-Scale Particle Tracking Velocimetry (LSPTV), and traditional LSPIV pre-processed with Seeding Density Index (SDI) in an experimental hydraulic model and two field cases. TiFA showed the highest overall accuracy and lowest computation cost in data analysis, especially under low tracer density conditions. In addition, TiFA can automatically filter out velocity data from low-quality zones such as no-tracer zones and surface glare zones. TiFA also showed its ability in processing turbulent flow. In summary, TiFA demonstrated its great potential and competence of measuring river surface velocity under relatively low tracer density conditions, making it a valuable candidate for future applications. |
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| Date de publication | 2025-05-18 |
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| Maison d’édition | Elsevier B.V. |
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| Déclaration de droit d’auteur | - © 2025 The Author(s). Published by Elsevier B.V.
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| Licence | |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | fcdf67d8-5a5d-44f0-8f32-6d6b2864969e |
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| Enregistrement créé | 2026-04-08 |
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| Enregistrement modifié | 2026-05-20 |
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