Session: 12-02-02 Wave-Structure Interactions II

Paper Number: 126293

126293 - Experimental Study on Wave Interaction With a Submerged Bar 

Climate change has been shown potential effects on coastal hazards, in particular for sea-level rise and tropical cyclone. As such, enhancing coastal resilience as well as coastal hazard reduction and mitigation are of great importance. Submerged breakwater has been frequently adopted worldwide to dissipate incoming wave energy. A considerable amount of studies has been focused on wave transformation and energy dissipation. However, detailed flow fields were not reported, which means that the vortical structure induced by wave-structure interaction cannot be clarified and also the potential erosion around the structure cannot be fully resolved. In this study, experiments were conducted in a two-dimensional glass-walled and glass-bottomed wave flume (20 m long, 0.5 m wide, and 0.80 m deep) at the Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Taiwan. Stokes and Cnoidal and waves were generated using a 2-meter-long-stroke piston-type wavemaker controlled by a programmable digital servomotor. An in-house PIV system was used to measure the flow kinematics of interest. The system is mainly consisted of a high-speed camera (Phantom LAB340) with a maximum resolution of 2560 x 1600 pixels and an 8 W argon-ion laser (Coherent Verdi v8) to create a 1 mm thick laser sheet and to illuminate the measuring region. We aim to measure and analyze the mean and fluctuated flow velocities around a submerged bar to facilitate our understanding on wave-induced flow characteristics. Results are not only usable for understanding the flow hydrodynamics but also valuable for validating different types of numerical models.

Presenting Author: Yun-Ta Wu National Cheng Kung University

Presenting Author Biography: Yun-Ta Wu is an Associate Professor at National Cheng Kung University. His research mainly focuses on wave hydrodynamics using well-controlled physical model and high-resolution numerical simulation.

Authors:

Yun-Ta Wu National Cheng Kung University
Cheng-Sheng Hsu National Cheng Kung University