Design weight of armour stone considering the effect of extreme waves

Date

2008-3

Author

Ozbahceci, Berguzar Oztunali
Ergin, Ayşen

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In this study, waves with the heights higher than H-1/3 in an irregular wave train are called as extreme waves and defined with the help of extreme wave parameter, alpha(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 alpha(extreme) cases (HE) and low alpha(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 H-1/10 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.

Subject Keywords

Extreme waves in an irregular wave train, Stability, Armour weight, Rubble-mound breakwater, Wave height, Transition zone, Permeability

URI

https://hdl.handle.net/11511/28227

Journal

Ocean Engineering

DOI

https://doi.org/10.1016/j.oceaneng.2007.10.001

Collections

Department of Civil Engineering, Article

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Citation Formats

B. O. Ozbahceci and A. Ergin, “Design weight of armour stone considering the effect of extreme waves,” Ocean Engineering, pp. 393–399, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28227.