New Fish Reef Block Ensuring Accurate Placement by Free-Fall Method
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 139, Issue 6
Abstract
A new fish reef block ensuring accurate placement by a free fall was developed to enable a more economical construction of nursery reefs for snow crabs. The block is based on a cube-shaped frame structure with extra shelf areas attached to the upper and lower frames to act as stabilizers. The falling behavior of the block in water was investigated by hydraulic model experiments and three-dimensional (3D) numerical computations. A stochastic model based on the experimental data was used to confirm a narrow distribution of the placement position as a result of the swing motion of the block during its fall. The numerical computation results indicate that the upper stabilizer produces a restoring moment for a tilted block and the lower stabilizer reduces instability in the wake of the falling block. In addition, a quick estimation method for the placement position was developed to determine the release point of the block during actual construction in the presence of ambient currents.
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Acknowledgments
The authors express their gratitude to Professor Y. Matsumi, Tottori University, for his valuable advice throughout this study. The authors also thank Professor N. Kobayashi, University of Delaware, for his helpful advice on this manuscript.
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 139 • Issue 6 • November 2013
Pages: 455 - 465
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 1, 2012
Accepted: Apr 15, 2013
Published online: Apr 16, 2013
Published in print: Nov 1, 2013
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