<b>142</b> Application of Digital Image Process on Observing the Motions of Wave and a Series of Poro-elastic Submerged Breakwaters

Lai, Jian-Wu; Lan, Yuan–Jyh; Hsu, Tai‐Wen; Ting, Chia-Huan; Chang, Chen-Chen

doi:10.1142/9789814282475_0141

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“…In the same study, a numerical model based on the two-dimensional Reynolds Average Navier Stokes (RANS) equations was proposed and tested with the experimental data. Lai et al (2009) developed a motion visualization analysis system for laboratory observations based on a Charge Coupled Device (CCD) camera, and analyzed the wave characteristics and the motions of poro-elastic submerged breakwaters. Lai (2009) investigated the hydrodynamics and turbulence for waves propagating over a coarse-grained sloping beach using both experimental and numerical models, with both PIV and Digital Image Process (DIP) techniques applied in the laboratory experiment.…”

Section: Introductionmentioning

confidence: 99%

Applying Piv Measurements on Flow Field of Waves Propagating Over a Single Submerged Porous Elastic Breakwater

Hsu

Lan

Lai

et al. 2012

Int. Conf. Coastal. Eng.

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The objective of the present study is to investigate the flow field for waves propagating over a submerged poro-elastic breakwater. Particle Image Velocimetry (PIV) measurements were performed in wave conditions with breakwaters made of different materials. The experimental results were compared for various rigid and impermeable, elastic and impermeable, as well as poro-elastic cases. Measurements of wave reflection and transmission induced by soft and permeable submerged breakwaters are both carried out. The results show that the oscillatory motion of elastic submerged breakwater can induce extra reflective waves and result in a larger reflection coefficient. Positive (counterclockwise) and negative (clockwise) vortices are generated due to corner separation and pressure gradients. The negative vortex obtained in a poro-elastic breakwater is generated by the surface friction at the top of the structure. Because of the permeability, it is found that the negative vortex at the upstream side of the elastic and permeable case is smaller than that of the rigid and impermeable one. In contrast, the positive vortex at the downstream side of the poro-elastic case is larger than that seen with the other two cases. It is concluded that a poro-elastic breakwater would induce different wave reflections and flow patterns from those seen with the other cases due to its particular wave and structure interactions.

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Section: Introductionmentioning

confidence: 99%