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|Overtopping reduction for harbor quays under very oblique waves attack|
Dan, S.; Altomare, C.; Suzuki, T.; Spiesschaert, T.; Willems, M.; Verwaest, T. (2014). Overtopping reduction for harbor quays under very oblique waves attack, in: 3rd IAHR Europe Congress: book of proceedings, 2014, Porto - Portugal. pp. [1-11]
In: (2014). 3rd IAHR Europe Congress: book of proceedings, 2014, Porto - Portugal. IAHR: [s.l.]. ISBN 978-989-96479-2-3. , meer
To test the hypothesis that the overtopping largely decreases for very oblique waves a 3D physical experiment was designed in the wave tank of Flanders Hydraulics Research, Antwerp. The scale of the experiment was decided to be 1:50 and the structure mimicking a harbor quay has 8 m length, 0.2 m height and 1 m width, in model scale. On top of the structure a storm return wall (0.02/0.04 m) is placed at different positions with respect to the front edge of the quay. On the back of the structure 16 boxes were placed to collect the overtopping volumes. The water level is ranging between -0.015 and +0.020 m with respect to the quay level, while the waves have Hs=0.03-0.06 m and Tp=1.1-1.7 s. The wave angle used for simulations is 80° with respect to the structure normal. The wave characteristics are measured using 17 wave gauges placed in arrays in such way to characterize the total wave height pattern at the toe of the structure. The mentioned analysis was performed using WaveLab v3.54 (© Aalborg University). As the wave paddle has no active absorption system a generous amount of passive absorption mattresses was placed around the basin to minimize the wave reflection.
After finalisation of 71 tests the results show a clear decrease in the measured overtopping volumes with respect to those calculated. Moreover there is high variability of the overtopping volumes along the structure. The experiment result in new overtopping reduction factors for very oblique waves at the vertical quays and advise for the height and position of the storm return wall.
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