針對波浪作用於直立堤時安定性情況，往昔學者多著重於堤前及堤底波力進行探討，針對堤後斷面受力情況相關研究相對較少，本文利用水工模型試驗且加入考慮堤後斷面受力，探討於波浪條件較大的情況下，防波堤受越波後其受力行為及其特性變化，包含各斷面最大波壓分布、各斷面受力時序列、防波堤安定性及越波參數與最大受力變化情況等。在固定水深的情況下，針對不同波高、週期的波浪條件進行規則波實驗，並於模型各斷面擺設密集波壓計，針對於考慮堤後斷面受力情況下，與往昔安定性分析的差別。
根據本文實驗結果，波浪條件會對防波堤受力造成直接影響，且當堤頂越波高度升高時，由於越波後會造成堤後水面震盪，故於底部斷面受力則會出現雙峰的受力分布。本文輔以COBRAS數值模式進行比較。比對結果發現數值模式與實驗結果其趨勢大致相同。

Research in the past has seldom discussed wave forces on the rear side of breakwater when overtopping occurs. In this paper, we use a hydraulic experiment to study the stability of vertical breakwater and consider the pressure on the rear side of the breakwater. Under extreme wave conditions, we conducted a regular wave experiment in constant water depth. The wave gauges and the wave pressure sensors were mounted at the tank and the breakwater. Then we compared the stability differences when considering rear wave forces and not considering rear wave forces.
According to experimental results, wave conditions will have a direct influence on wave forces. When the crest level of overtopping increases, the wave forces at the bottom will form a double peak distribution. This article also uses a numerical model (COBRAS) to compare with experimental results. Comparing the results shows that experimental results and numerical results get the excellent agreement.

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