Fig. 1. Development of PIV

Fig. 2. Concept of PIV measurements and 1-meter path length PIV measurement plane^［24］

Fig. 3. Individual particle intensity variations

Fig. 4. Components and applications of PIV

Fig. 5. Laser-induced incandescence particle image velocimetry

Fig. 6. Instantaneous streamwise velocity field^［144］

Fig. 7. View of Brenta River^［151］

Fig. 8. Results in Ref.［21］

Fig. 9. A surface velocity field generated using PIV and the spatial distribution of reference measurements near the fishway^［131］