The prediction of scour evolution at bridge foundations is utmost importance for engineering design and infrastructures’ safety. complexity the scouring inherent flow field result separation generation multiple vortices further magnified due to dynamic interaction between movable bed throughout development a hole. In experimental environments, current approaches characterization rely mainly on ...

A concept for the realisation of directional laser Doppler velocimeters (LDV), without having to use opto-electronic modulators like Bragg cells is presented. The concept is based on the use of a diode-pumped fibre laser, emitting at two different wavelengths. The two laser colours are used to generate two interference fringe systems in the measuring volume of the LDV system. The fringe systems...

We present a laser Doppler velocimeter (LDV) in monostatic coaxial arrangement consisting of off-the-shelf telecom-grade components: a single frequency laser (wavelength λ = 1.5 μm) and a high-finesse scanning Fabry-Perot interferometer (sFPI). In contrast to previous 1.5 μm LDV systems based on heterodyne detection, our sFPI-LDV has the advantages of having large remote sensing range not limit...

A physical model of gabion overflow dams was studied to determine the velocity profile and Reynolds shear stress. Physical tests were done under two different conditions of dam crest, overflow dams with impermeable and with permeable crests. Instantaneous velocity components over dam crest were measured by an ADV (Acoustic Doppler Velocimeter) instrument. This instrument is capable of measuring...

Flow in river bends is associated with generation of secondary flows that leads to a rather complicated flow pattern around bridge piers located the bend. In this study, patterns rectangular and oblong models collar at 90o angle 180-degree sharp bend an experimental plume were investigated. The 3D velocity data collected using Vectrino velocimeter. results indicated presence pier caused more in...