Functional Limit of Block-type Drift-algal Traps under Waves
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- KAWAMATA Shigeru
- National Research Institute of Fisheries Engineering
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- ISOGAMI Kotaro
- Fukushima Prefectural Fisheries Experimental Station
Bibliographic Information
- Other Title
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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.
Journal
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- Journal of Fisheries Engineering
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Journal of Fisheries Engineering 36 (1), 11-19, 1999
The Japanese Society of Fisheries Engineering
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Details 詳細情報について
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- CRID
- 1390001205864189568
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- NII Article ID
- 10008275149
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- NII Book ID
- AN10278554
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- ISSN
- 21897131
- 09167617
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- NDL BIB ID
- 4818641
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed