The Runup of Solitary Waves on Stepwise Sea Dikes

• Main Authors: Wen-Shao Hsieh, 謝文紹
• Other Authors: Yung-Chao Wu
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/51711803931005319097

碩士 === 國立交通大學 === 土木工程系 === 88 === This study investigates the solitary wave effect on traditional plain and stepwise slope, confirms that the height of the stepwise runup is smaller than the traditional plain slope when they are in the same average slope. In addition, the terrace is longer the runup is lower. The numerical model simulates the change of a nonbreaking solitary wave and a breaking solitary wave on sea dikes and discusses the influence of energy loss as well as the length of terrace on the runup height. Asymptotical analytic solutions and experiment results are selected to verify the accuracy of the present numerical model. The one-dimensional nonlinear shallow water equations are solved here numerically by Lax-Wendroff dissipative scheme. The dissipation term allows discontinuities, jumps, to arise and propagate naturally within the flow field. The dissipation also enables the computation to continue by diffusing the jump over a few space grids. Comparing the numerical results with Synolakis' experimental reveals the runup and trend of the numerical closely resemble each other. The runup of the non-breaking solitary wave increases as the slope gradient decrease. This phenomenon is contrary to the breaking solitary wave.