ARMOR DAMAGE ON HARBOR-SIDE RUBBLE MOUND OF COMPOSITE BREAKWATERS AGAINST WATER JET CAUSED BY IMPINGING BORE-LIKE TSUNAMI

Sohei Maruyama; Jun Mitsui; Akira Matsumoto; Minoru Hanzawa

doi:10.9753/icce.v34.structures.35

No. 34 (2014), Coastal Structures

No. 34 (2014)

ARMOR DAMAGE ON HARBOR-SIDE RUBBLE MOUND OF COMPOSITE BREAKWATERS AGAINST WATER JET CAUSED BY IMPINGING BORE-LIKE TSUNAMI

Coastal Structures

https://doi.org/10.9753/icce.v34.structures.35

Published 2014-10-28

Sohei Maruyama⁺⁻
Jun Mitsui⁺⁻
Akira Matsumoto⁺⁻
Minoru Hanzawa⁺⁻

Sohei Maruyama

Fudo Tetra Corporation

Jun Mitsui

Fudo Tetra Corporation

Akira Matsumoto

Fudo Tetra Corporation

Minoru Hanzawa

Fudo Tetra Corporation

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Keywords

Tsunami
water jet
rubble-mound of composite breakwaters
armor unit

How to Cite

Maruyama, S., Mitsui, J., Matsumoto, A., & Hanzawa, M. (2014). ARMOR DAMAGE ON HARBOR-SIDE RUBBLE MOUND OF COMPOSITE BREAKWATERS AGAINST WATER JET CAUSED BY IMPINGING BORE-LIKE TSUNAMI. Coastal Engineering Proceedings, 1(34), structures.35. https://doi.org/10.9753/icce.v34.structures.35

Abstract

A series of hydraulic model experiments was systematically and carefully carried out to estimate the stability of various types of armor units for a harbor-side rubble mound of a composite breakwater against a water jet caused by an impinging bore-like tsunami. Armor stones of weight 1 ton were seen to be easily removed by the tsunami flow. Flat type concrete blocks with well-arranged holes showed high stability. In the case of using wave-dissipating blocks, the total stability of the armor layer was enhanced by placing heavier blocks along the toe of the slope. Numerical analysis was also carried out to investigate the effect of the shape of the blocks. The computed time series of water level and the behavior of the impinging jet agreed well with the experimental ones. The computational result of hydrodynamic forces acting on armor blocks revealed that the uplift forces were largely decreased by the holes in the blocks.

https://doi.org/10.9753/icce.v34.structures.35

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References

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ARMOR DAMAGE ON HARBOR-SIDE RUBBLE MOUND OF COMPOSITE BREAKWATERS AGAINST WATER JET CAUSED BY IMPINGING BORE-LIKE TSUNAMI

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