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越波對直立式防波堤安定性分析的影響研究

The Influence of Wave Overtopping on the Stability Analysis of Vertical Breakwaters

摘要


本研究目的為探討越波所產生堤後波動對於防波堤之受力及安定性影響,首先以台中港北防波堤建置透水結構物與波浪場計算模式,並利用水工模型試驗資料進行模式驗證,最後以台中港50 年至250 年迴歸期颱風波浪及不同極端情況之波浪條件,探討波浪經過北防波堤越波後之堤後波動對防波堤安定性的影響。本研究在考慮越波情況下,修正滑動和傾倒安全係數之計算方式,根據時間序列之安全係數和受力(矩)情形加以分析,結果顯示在考慮越波所產生堤後波動造成防波堤之安定性變化,主要受防波堤前後波動之位相差影響。

並列摘要


The purpose of this study is to perform the stability analysis of breakwater, concerning the overtopping effect. First, a COBRAS model of the Taichung Harbor breakwater structure is created. Secondly, the model is verified with experimental data, and reasonable agreement is shown between the two. Finally, the breakwater stability analysis, concerning the overtopping effect, under 50 to 250-year return-period typhoon wave conditions as well as extreme wave conditions is discussed. The result shows that the overtopping effect will cause the sliding safety factor and overturning safety factor to oscillate.

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