Airborne image velocimetry system and its application to measure the surface flow fields of long river reaches
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Date
2022-12-15Type
- Journal Article
Abstract
An airborne image velocimetry (AIV) system is developed for field measurements of long river reaches based on ground control points placed along both riversides and tracking particles seeded onto the water surface. Image frames are taken by an unmanned aerial vehicle in cruise flying mode and stabilized by orthorectification and georeferencing using structure from motion (SfM). Particle image velocimetry is applied to velocity field computation, resulting in a panoramic velocity field. Applications of AIV in urban and rural areas produce high coverage of velocity fields with a high spatial resolution, enabling a detailed description of the flow characteristics. The relative errors of the streamwise velocity components of AIV are ?0% and ?% compared with that of the acoustic Doppler current profiler (ADCP) and flow meter, respectively, which meet the accuracy requirements of field measurements. Overall, with its high reliability and strong applicability, the AIV system could conduct large-scale velocity field measurements with high spatial resolution in long river reaches. Show more
Publication status
publishedExternal links
Journal / series
Qinghua Daxue Xuebao = Journal of Tsinghua UniversityVolume
Pages / Article No.
Publisher
Qing hua da xueMore
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