Functional Limit of Block-type Drift-algal Traps under Waves

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  • 波動下におけるブロック型藻留施設の適用限界
  • ハドウ カ ニ オケル ブロックガタ ソウリュウシセツ ノ テキヨウ ゲンカイ

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Abstract

Trapping drift algae can be a useful engineering technique of enhancing habitats for commercially important abalone and sea urchins because most of food algae may be swept out of their nearshore habitats by waves. However, many attempts with artificial barriers made primarily of concrete blocks and quarry rock have failed to trap drift algae because drift algae can be easily raised over barriers by turbulent water flows caused around them. This paper describes a mathematical method of predicting the wave-induced velocity at which drift algae begin to pass over the block under waves. A scale-model experiment in a wave channel shows that the dimensionless velocity limit, defined as the ratio of the velocity amplitude limit to the fall velocity of drift algae, increases with the ratio of the block height to wavelength. A good agreement was found between velocity amplitude limit predicted from the empirical equation and that observed in a field experiment.

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