Experimental studies on runup of periodic waves on a slope and undular flows over weirs

• Main Authors: Yu-SyuanZeng, 曾鈺軒
• Other Authors: Tian-Shiang Yang
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/49053078842494515548

碩士 === 國立成功大學 === 機械工程學系 === 104 === In nature events, different types of water waves are sometimes dangerous like the runup of ocean waves in a storm or the occurrence of undulation waves when flow pass a rectangular weir in a river. A relatively small laboratory wave system was established to understand these two phenomena. A paddle-type wavemaker system which generates waves mostly matching the theoretical capillary-gravity waves is used to test the runup of periodic waves on a slope. In this system, we also use a triangular prism barrier with varied position, height and width to affect the runup on the slope. Also, a steady flow system was applied to study the undular flows over weirs, and we attempt to diminish the undulation by wave superposition with two rectangular weirs. Results in the runup system show the two possibilities of runup reduction or enhancement with appropriate locations and shapes of the barrier on the slope, and the influence of the barrier would be more significant when locating the barrier closer to the equilibrium water line. Also, the findings in the undular flows over weirs show that the maximum amplitude of undular waves would vary with different distances between weirs.