Results 111 to 120 of about 166 (142)
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Reducing the operator effect in LSPIV image-based discharge measurements
2023The 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 +3 more
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Advantages of a mobile LSPIV method for measuring flood discharges and improving stage–discharge curves [PDF]
Journal of Hydro-Environment Research, 2011 Abstract This paper investigates the potential of fast flood discharge measurements conducted with a mobile LSPIV device. LSPIV discharge measurements were performed during two hydrological events on the Arc River, a gravel-bed river in the French Alps: a flood greater than the 10-year return period flood in May, 2008, and a reservoir flushing ...
Alexandre Hauet +2 more
exaly +4 more sources
River surface target enhancement and background suppression for unseeded LSPIV
Flow Measurement and Instrumentation, 2013Abstract Large-Scale Particle Image Velocimetry (LSPIV) is an image-based technique for nonintrusive streamflow monitoring, where the visibility of flow tracers is one of the main limitations to its application in field conditions. Based on the target characteristics of flow tracers as well as the optical environment of river surface, the paper ...
Zhen Zhang +3 more
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Application of LSPIV to measure supercritical flow in steep channels with low relative submergence
Flow Measurement and Instrumentation, 2020Abstract Measuring flow discharge has always been one of the most important concerns of water experts. To measure discharge in streams using velocity-area method it is necessary to quantify average velocity of the flow. It is not feasible to measure velocity by contact approaches like current meters under certain conditions such as in flood periods ...
Josef Schneider
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Application of an Automated Discharge Imaging System and LSPIV during Typhoon Events in Taiwan [PDF]
Water (Switzerland), 2018 An automated discharge imaging system (ADIS), a non-intrusive and safe approach, was developed for measuring river flows during flash flood events. ADIS consists of dual cameras to capture complete surface images in the near and far fields. Surface velocities are accurately measured using the Large Scale Particle Image Velocimetry (LSPIV) technique ...
Chih-Chieh Young +2 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), 2020With 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 +2 more
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Comparison of macroturbulence measured using decomposition of PIV, ADV and LSPIV data
Journal of Hydraulic Research, 2011Visualization 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), 2017To 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 +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 +3 more
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Bedform Measurements with LSPIV for Open Channel Flow
Proceedings of the 39th IAHR World Congress, 2022Hao-Che Howard Ho +2 more
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