Results 151 to 160 of about 948 (176)

The Use of LSPIV to Measure Large Streamwise Vortices

World Environmental and Water Resource Congress 2006, 2006
The impact of large streamwise vortices or macroturbulence upon suspended sediment transport and mobility of aquatic species is well recognized. In order to advance the understanding of large streamwise vortices, it is increasingly important to map the turbulent structures on a large scale domain such as for a total river reach.
J. F. Fox, A. Patrick, S. Wood
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Augmenting LSPIV Surface Current Measurement with Drifting ASVs

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO), 2018
Large Scale Particle Image Velocimetry (LSPIV) has been successfully used in the field to gather water surface flow data, which is critical to understanding complex geomorphic, hydrologic, and ecological river processes. Its success, however, depends on lighting conditions and adequate flow seeding with trackable debris or visual features, that can be ...
Christopher Tomaszewski, Paul Scerri, John Dolan   +2 more
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Reducing the operator effect in LSPIV image-based discharge measurements

2023
The operator effect is a prominent error source in image-based velocimetry methods. The LSPIV method is known to be sensitive to the parameters and choices of the user, as shown in the literature and emphasized by the results of a video gauging intercomparison, the Video Globe Challenge 2020 (VGC2020) (Le Coz et al., 2021).
Guillaume Bodart, Jérôme Le Coz, Magali Jodeau, Alexandre Hauet   +3 more
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Design of online open channel flow monitoring system based on LSPIV

2020 5th International Conference on Communication, Image and Signal Processing (CCISP), 2020
With the change of global climate in recent years, the risk and harm of flood disasters are gradually increasing. Long-term monitoring for prediction and assessment of them open channels is very necessary. Nowadays, hydropower stations often bear more flood discharge costs to help the downstream avoid risks, but there is a lack of a scientific method ...
Xincheng Liu, Yongjian Wang, Jiegang Peng   +2 more
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Comparison of macroturbulence measured using decomposition of PIV, ADV and LSPIV data

Journal of Hydraulic Research, 2011
Visualization and length-scale estimates are provided for turbulence in open channel flow over a gravel-bed. Results obtained using the digital particle image velocimetry (PIV) followed by post-processing with proper orthogonal decomposition showed higher and lower velocity regions aligned along a stagnation plane extending from the bed at ...
James F. Fox, Brian J. Belcher
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IP camera-based LSPIV system for on-line monitoring of river flow

2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI), 2017
To improve the real-time performance and robustness of the existing Large-Scale Particle Image Velocimetry (LSPIV) system, an IP camera-based LSPIV system has been developed for on-line monitoring of river flow. The camera was refitted to support NIR imaging to enhance the contrast between flow tracers and water surface.
Zhang Zhen, Zhou Yang, Li Yuchou, Ye Youjie, Li Xurui   +4 more
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Quantifying the operator effect in LSPIV image-based velocity and discharge measurements

2022
<p><span>The operator effect is a prominent error source in image-based velocimetry methods. Video sampling, ortho-rectification parameters, motion analysis parameters and filters can strongly impact velocity and discharge measurements. This has been reported in the literature (e.g.
Guillaume Bodart, Jérôme Le Coz, Magali Jodeau, Alexandre Hauet   +3 more
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Bedform Measurements with LSPIV for Open Channel Flow

Proceedings of the 39th IAHR World Congress, 2022
Hao-Che Howard Ho, Yen-Cheng Lin, Xin-Yu Chen   +2 more
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On the performance of streamflow gauging using CCTV-integrated LSPIV in diverse hydro-environmental conditions

Environmental Monitoring and Assessment
Addressing the critical need for precise streamflow measurements in hydro-environmental research, this study evaluates large-scale particle image velocimetry (LSPIV) using cost-effective closed-circuit television (CCTV) cameras, providing a detailed sensitivity analysis in both laboratory and real-world canal settings.
Seyed Hossein, Mohajeri, Ashkan, Noori, Mojtaba, Mehraein, Mostafa, Nabipour   +3 more
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LSPIV measurements to assess the impact of a bridge on a weakly undulating flow

Journal of Applied Water Engineering and Research, 2023
Matías Eder, Leticia Tarrab, Román Martino, Leandro Masso, Antoine Patalano, Matías Ragessi, Gerardo Hillman, Andrés Rodriguez, Mariana Pagot   +8 more
openaire   +1 more source