CONICET | Buscador de Institutos y Recursos Humanos

For decades, image based velocimetry techniques, both in the Eulerian and Lagrangian frame of references, have playedan important role for the understanding of several environmental and hydraulics phenomena. The constant technologicaldevelopments have made sensors more accessible to the end user, thus they are nowadays a viable option to performmeasurements in a broad range of problems. There have been a scientific and engineering interest to use image basedvelocimetry techniques to describe large-scale phenomena and in particular, in fluvial hydraulics, to improve ourunderstanding of natural and artificial large-scale open channel flows. This paper presents recent contributions, by theauthors of this work, to the development and application of Large-Scale Particle Image Velocimetry (LSPIV) and Large-Scale Particle Tracking Velocimetry (LSPTV). The work shows the results of the application of LSPIV to the measurementof flow discharges in Mountain Rivers of the Córdoba province in Argentina. These rivers are characterized by a high flowvariability, mainly due to the occurrence of flash floodings. Due to the extreme flow condition during these events, the useof intrusive measurement technologies such as current meters or Acoustic Doppler Current Profiler (ADCP) is difficult dueto the high risk for the integrity of instruments and operators. The LSPIV technique has been implemented using remotedigital cameras mounted on a crane, and on an Unmanned Aerial Vehicle (UAV). The work also present the results ofLSPTV in a large-scale physical model experiment. The development of a software for the application of both techniquesis also described in this paper. In particular the pre and post-processing techniques implemented in the software aredescribed. These techniques, such as data rectification and unsteady movements compensation, are crucial for thesuccessful application of LSPIV and LSPTV in large-scale conditions.

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