Large scale PIV-measurements at the surface of shallow water flows

Weitbrecht, Volker; Kühn, Gregor; Jirka, Gerhard H.

doi:10.1016/s0955-5986(02)00059-6

Cited by 123 publications

(84 citation statements)

References 19 publications

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“…When sufficient natural particles are recognizable in the field and thus can be used as tracers, the use of artificial particles is not necessary . Nevertheless, in absence of natural tracers, as in the current situation, seeding particles should be spread in the stream during the field measurements (Weitbrecht et al 2002;Muste et al 2004). Once the approach has been selected, it is necessary to follow the correct methodology.…”

Section: Lspiv Methodsologymentioning

confidence: 99%

“…Each step has important parameters which should be adapted depending on the nature of the flow and field conditions. explained in detail (Fujita et al 1998;Weitbrecht et al 2002;Muste et al 2011), only the parameters relevant to this experiment are discussed.…”

Section: Lspiv Methodsologymentioning

confidence: 99%

“…Furthermore, the maximum particle displacement between two frames should be less than 50% of the IA (velocity/time interval ≤ ½ IA side length) to minimize the loss of particles between two consecutive frames. Following Weitbrecht et al (2002), we make use of an adaptive multipass since the velocity field conditions are not homogeneous. This multipass method improves the quality of the measurements by selecting up to three different sizes for the IA, and using the results of the processing step with larger IA as first estimates for the processing step with a smaller IA.…”

Section: Image Processingmentioning

confidence: 99%

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Validation of large-scale particle image velocimetry to acquire free-surface flow fields in vegetated rivers

Creëlle

Roldan

Herremans

et al. 2016

Journal of Applied Water Engineering and Research

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The reliability of large-scale particle image velocimetry (LSPIV) methodology to measure a 2D surface velocity field in a vegetated lowland stream is evaluated. To this end, measurements of the free-surface flow field obtained with LSPIV are compared with measurements with an electromagnetic current meter (ECM) close to the surface at four different locations. The measurements were performed monthly, allowing the evaluation of the LSPIV measurements in relation to different vegetated conditions. The difference observed between the mean velocities measured with ECM and LSPIV remains low in winter, whereas an increase is observed in summer. Inappropriate particle seeding density and unsteadiness of the flow are the main sources of LSPIV reliability reduction. Nonetheless, the seasonal average frequency of reliable LSPIV measurements is 97%, 95% and 78% in winter, spring and summer, respectively. The results illustrate that LSPIV is an inexpensive methodology, which provides high-resolution and reliable data to study the flow-field distribution in vegetated rivers, provided some considerations are taken into account to deal with the added complexity of the vegetation presence and the field conditions.

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Section: Lspiv Methodsologymentioning

confidence: 99%

Section: Lspiv Methodsologymentioning

confidence: 99%

Section: Image Processingmentioning

confidence: 99%

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Validation of large-scale particle image velocimetry to acquire free-surface flow fields in vegetated rivers

Creëlle

Roldan

Herremans

et al. 2016

Journal of Applied Water Engineering and Research

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“…Knowledge of surface velocities has proven to be useful in many experimental situations, including the investigation of LSPIV sensitivity analysis (Meselhe et al, 2004), observation of floating objects such as ice sheets and their impact on flow patterns (Ettema et al, 1997) and measurement of large coherent structures in shallow reservoirs of different geometries (Kantoush and Schleiss, 2009a). Furthermore, several researchers (e.g., Weitbrecht et al, 2002;Meselhe et al, 2004;Kantoush and Schleiss, 2009b) have studied shallow flows under large-scale laboratory conditions. LSPIV has been extensively applied to various laboratory models for bridge scour (e.g., Morales et al, 2008) and for the approach flow of power plant spillways (e.g., Bieri et al, 2009;De Cesare et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

LSPIV implementation for environmental flow in various laboratory and field cases

Kantoush

Schleiss

Takemon

et al. 2011

Journal of Hydro-environment Research

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Large-Scale Particle Image Velocimetry (LSPIV) is an extension of a quantitative imaging technique to measure water surface velocities using simple and inexpensive equipment. This paper describes the implementation of imaged-based LSPIV in eight different environmental flow and hydraulic engineering applications for the investigation of complex configurations with and without sediment transport (bed and suspended loads). These applications include the investigation of sedimentation in shallow reservoirs, run-of-river hydropower plants, side weirs used to control bank overflow, flow fields in different spillway configurations with and without Piano Key Weir (PKW), oil spills with flexible and rigid barriers, groin fields, river confluence, and sediment flushing in reservoirs. The paper summarises some special problems encountered in such study cases. The selection and adjustments of the parameters to solve them properly were examined. The potential of LSPIV to measure surface flow velocities in the context of river and dam engineering projects is shown. Despite significant variations of natural and artificial illuminations and seeding tracers in the laboratory, field, wind, and water surface elevation, LSPIV was applied successfully to obtain velocity measurements. LSPIV has proven to be a reliable, flexible, and inexpensive flow diagnostic tool that can be employed successfully in many engineering applications. Ó

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“…The mean and turbulent flow properties have been measured with a SurfaceParticle-Imaging-Velocimetry system (Weitbrecht et al 2002). In Fig.…”

Section: Introductionmentioning

confidence: 99%

Invited lectures

2004

Environmental Hydraulics and Sustainable Water Management, Two Volume Set

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A 2-D Lagrangian-Particle-Tracking-Method (LPTM) has been developed to simulate dispersive mass transport in rivers under the influence of dead-water zones, such as groin fields. Results from laboratory experiments are used in the LPTM to include velocity and diffusivity distribution and the mean residence time. With the help of different LPTM simulations where the retention effect of the groin fields varies along the travel distance, the influence of morphological changes on the transport characteristics has been analyzed.

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Large scale PIV-measurements at the surface of shallow water flows

Cited by 123 publications

References 19 publications

Validation of large-scale particle image velocimetry to acquire free-surface flow fields in vegetated rivers

Validation of large-scale particle image velocimetry to acquire free-surface flow fields in vegetated rivers

LSPIV implementation for environmental flow in various laboratory and field cases

Invited lectures

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