自然界中不同種類的水波有時可能造成危險；例如當風暴來襲時的海浪溯升，以及當河川流過一矩形堰時所產生的波動現象。因此在本研究中我們建立一個較小規模的造波實驗系統來探討這兩個現象。我們所建造的擺動式造波系統所產生的波與表面張力-重力波理論大致吻合，並可應用來測試週期波所產生的溯升高度。同時我們在斜坡上放置一三角堤，並改變其位置、高度以及寬度來研究其對溯升高度的影響。此外，我們也使用一穩定循環流水系統來研究當流體通過兩個矩形堰時，所產生的波狀堰流是否可以用波疊加的方式來減弱之。

在溯升系統的實驗結果顯示，溯升高度有可能因為選擇的三角堤位置與形狀，而放大或減弱。此外，當三角堤的位置較靠近平衡水線時，其影響效果會較強。而在波狀堰流的實驗中，我們發現所產生的波形之最大振幅可以藉由改變堰與堰之間的距離而明顯變化。這些發現除了在本文中可以學理了解之外，更可在未來繼續延伸，以對防災科技之發展有所貢獻。

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.

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