本文為以試驗的方法研究波浪在階梯式斜堤上之變形和遡升行為。試驗中使用之斜堤為1：6坡度，階梯為2.5cm高度和15cm縱深。水深為25cm，波浪週期為1.25sec，1.5sec，1.75sec，2.0sec，波高分別為10cm，8cm，6cm，3cm。波浪在階梯斜坡上之傳遞過程水位變化以數位相機拍攝記錄並分析。波浪遡升高度也同時記錄以分析其波浪週期和波高之關係。由研究結果顯示，波浪在斜坡階梯上之遡上及流下均有能量損失，波浪遡上之同時伴隨之淺化效應造成波高之增加，亦可能造成碎波發生。而波浪流下階梯時，亦隨著階梯之下降而起伏流下。波浪在階梯上之變化具有階梯式之重覆相似變化。基本上，隨著入射波高增加，波浪遡升高度亦增加，但呈現階梯式行為。波浪之遡升隨波浪週期之增加而增加，斜坡階梯對波浪變形之效應，對於長週期波浪更加明顯。藉由本文對階梯式斜堤上波浪特性之研究，希望能提供後續研究之參考。

The purpose of this study is to investigate wave behaviors running upon stepped sloping breakwaters experimentally. An inclined wall with 1:6 slope, and uniform stairs of 2.5cm height and 15cm length is used in wave channel. In the experiments, the water depth is 25cm, wave periods are 1.25sec, 1.5sec, 1.75sec, 2.0sec, and wave heights are 10cm, 8cm, 6cm, 3cm. Wave forms on sloping stairs are recorded using digital camera, and analyzed afterwards. Wave run-up heights are also recorded and used to investigate connections with wave heights and wave periods. From experiments, incident waves acting on sloping stairs can dissipate wave energy in running up and running down processes. Accompanying with running up shoaling effects occur which increases wave heights, that can produce wave breaking situations. While waves running down, the water surface is following the shape of the stairs going downwards. Wave envelopes on sloping stairs possess characteristics of repeating similitude between stairs. With increasing incident wave height, wave run-ups can be increased basically, however, limited by the stair height wave run-ups increase stairwisely. On the other hand, wave run-ups increase with increasing wave period, and effects of sloping stairs on wave transformation are dominant for longer waves. It is expected that the present study of waves on sloping walls with stairs can be informative for future studies.

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