Figure 2 - uploaded by Merel Verbeek
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(left) Calibrated image where P8, P9 and HATT 1-5 denote the upstream location of the pillars and HATTs respectively, (right) the 5-min averaged flow velocity field at end of the tidal flood phase obtained with PIV (10:05-10:10UTC+1, flow is to the right).
Source publication
Large scale Particle Image Velocimetry (PIV) can be of great use to quantify the surface flow velocities of highly turbulent environmental flows. Preliminary results show that the turbulent flow scales of a jet downstream a semi-open barrier can be quantified using unseeded PIV. The technique, executed with a digital camera, can produce sufficientl...
Context in source publication
Context 1
... surface velocity vectors match within a 0.5 ms −1 range to the ADCP-measurements, which can mostly be attributed to the 5 m depth difference between the PIV and ADCP-measurements. The calculated velocity vectors amounts to approximately 1.5 ms −1 in jets of the neighbouring gates and and approximately 1 ms −1 in the wake of the pillars (see Fig. 2). In a time sequence of the vectors the shedding process of the large vortex structures from the barrier pillars (Fig. 3) can be observed. The length scales can be separated from the smaller fluctuations downstream the HATTs (at the centre of Fig. 3). Future work will focus on the characterization of these different vortex structures ...
