In this study, waves with the heights higher than H_(1/3) in an irregular wave train are called as extreme waves and denned with the help of extreme wave parameter, α_(extreme). In order to see the effect of extreme waves on the design weight of armour stone, stability analysis is carried out based on the hydraulic model test results. The test results of high α_(extreme) cases (HE) and low α_(extreme) cases (LE) are compared with currently used van der Meer's formulae with permeability factor P = 0.4 and 0.45 and Hudson formula by using H_(1/3) and H1/10 in terms of the design weight of armour stone. As a result of the comparison, it is found that Hudson formula by using H_(1/3) underestimates the necessary armour weight. Usage of H_(1/10) instead of H_(1/3) in Hudson formula doubles the weight which seems overestimated when Irribaren number is away from the transition zone in which both wave run-up and run-down forces become effective. However, it seems underestimated near the transition zone where experiment case HE gives higher armour weights. When the design weight of armour stone is calculated by van der Meer's formulae with P = 0.4, it may be necessary to increase the weight up to 30% in the case of high extreme waves. On the other hand, van der Meer's formulae may overestimate the weight 14% when the extreme waves are low.
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机译：在这项研究中，将不规则波列中高度高于H_（1/3）的波称为极端波，并借助极端波参数α_（extreme）进行定义。为了了解极端波浪对装甲石设计重量的影响，基于水力模型试验结果进行了稳定性分析。通过使用H_（1/3），将高α_（极端）案例（HE）和低α_（极端）案例（LE）的测试结果与当前使用的渗透系数P = 0.4和0.45的van der Meer公式以及Hudson公式进行比较）和H1 / 10（以防弹衣的设计重量计）。作为比较的结果，发现使用H_（1/3）的哈德森公式低估了必要的装甲重量。在哈德森公式中使用H_（1/10）代替H_（1/3）会使重量加倍，当Irribaren数远离波浪上升和下降力均有效的过渡区域时，重量似乎被高估了。但是，在过渡区附近，实验案例HE给出了更高的装甲重量，这似乎被低估了。当装甲石的设计重量通过Van der Meer公式（P = 0.4）计算时，在极端海浪较高的情况下，可能有必要将重量增加至30％。另一方面，当极端波浪较低时，范德米尔公式可能会高估重量14％。
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