Stability of Concrete Blocks Covering Protection Mounds of Fishing Port Breakwaters against Tsunami Overflow

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  • 漁港防波堤の腹付マウンド被覆ブロックの津波越流に対する安定性の検討
  • ギョコウ ボウハテイ ノ ハラ ツキ マウンド ヒフク ブロック ノ ツナミエツリュウ ニ タイスル アンテイセイ ノ ケントウ

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Abstract

Placement of protection mounds at the rear-side of breakwaters is one measure for increasing the resistance of the fishing port breakwaters against tsunami. Placement of concrete blocks are necessary to prevent the mounds from scouring due to the overflow of tsunami. Establishment of a practical design method for concrete blocks covering protection mounds of fishing port breakwaters against tsunami overflow is an urgent issue. In this report, two existing design methods, namely, a velocity based method and an overflow depth based method, are reviewed. The influences of the rear-side waver level and the block shape on the armor stability are discussed by using the experimental results. Numerical analysis is conducted to reveal the failure mechanism of the blocks. The activity of the Association for Innovative Technology on Fishing Ports and Grounds is also reported. Hydraulic model experiments were conducted in this activity to determine the stability number for each concrete block and these are used to calculate the required mass of the block against tsunami overflow.

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