Results 131 to 140 of about 600 (156)
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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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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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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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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 +1 more
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Integrating unmanned aerial systems and LSPIV for rapid, cost-effective stream gauging
Journal of Hydrology, 2018 Abstract Quantifying flow in rivers is fundamental to assessments of water supply, water quality, ecological conditions, hydrological responses to storm events, and geomorphological processes. Image-based surface velocity measurements have shown promise in extending the range of discharge conditions that can be measured in the field.
Bruce L. Rhoads, Quinn Lewis
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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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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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Hydrological Processes, 2016
AbstractAn imaging‐based automated large‐scale particle image velocimetry (LSPIV) system for flash flood monitoring is developed and deployed in a mountainous stream in the Longchi Catchment, Chengdu, China. This system is built from a low‐cost Raspberry Pi board‐level computer with a camera module, which can acquire continuous images/videos ...
Liao Qian
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AbstractAn imaging‐based automated large‐scale particle image velocimetry (LSPIV) system for flash flood monitoring is developed and deployed in a mountainous stream in the Longchi Catchment, Chengdu, China. This system is built from a low‐cost Raspberry Pi board‐level computer with a camera module, which can acquire continuous images/videos ...
Liao Qian
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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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LSPIV measurements to assess the impact of a bridge on a weakly undulating flow
Journal of Applied Water Engineering and Research, 2023Matías Eder +8 more
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