中文摘要
本文對越波時防波堤上不規則波波壓加以研究。本文進行不規則波浪越波及不越波時防波堤之波壓實驗，以探求越波及不越波時防波堤上波壓之差異，及越波時不同堤頂高度對防波堤上波壓之影響。並將本文實驗結果與Goda波壓公式及葉（2001）之Goda波壓修正公式相比較，以探討葉（2001）之Goda波壓修正公式是否可以延伸使用於不規則波中。
研究結果顯示，不規則波越波時防波堤面上所受全壓力之代表統計值較不越波時下降0％～70％，降幅隨Hc/d及d/Ls之減小及Ĥ/d之增大而增加，隨d’/d之減小而增加。當越波且Ĥ/d及d/Ls較小時，Goda波壓公式全壓力計算值有些微低估情形，隨Ĥ/d之增加，Goda波壓公式全壓力計算值會越行高估，此高估現象於d/Ls及Hc/d越小時越明顯，又Goda波壓公式全壓力計算值的高估情況隨d’/d之減少而有增加趨勢，其增加幅度約為20%。在越波的情形下，葉（2001）之Goda波壓修正公式計算值會較符合實驗值，故其公式可以延伸應用於不規則波中，在設計上能更符合經濟效益。

ABSTRACT
The purpose of this study was to investigate effect of wave overtopping on irregular wave pressure on breakwaters. We carried out the overtopping experiments of breakwaters with different crown heights by using irregular waves. Then we compared the experimental results to discuss the relationship between the crown height and wave pressure. And we also compared the experimental results with Goda’s formula and Yeh’s (2001) formula with revise from Goda’s formula to discuss Yeh’s (2001) formula can be extends applied in irregular waves.
The measurements reveal that the statistical values of total wave pressure due to effect of wave overtopping was reducible ranging 0％～70％,comparing with the situation of non-overtopping wave upon breakwaters. The decreases in Hc/d、d/Ls and d’/d and increase in Ĥ/d will contribute to the decreases in the wave pressure force. The computation of Goda’s formula will overestimate the actual wave pressure force when wave overtopping. This overestimate wall more obvious when Ĥ/d was higher and d/Ls and Hc/d was lower, along with d’/d reduction, the ratio of overestimate regular meeting increases approximately 20%. Come to the conclusion, Yeh’s (2001) formula will comparatively conforms of the experiment results when wave overtopping. So, we can be extends applied the formula in irregular wave, and it is designing to be more economical and effectiveness.

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