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Coastal and Oceanographic Buoy Engineering.

Recently, a beautifully designed spar buoy (complete with multiple data sensors, computerized data storage, and radio transmission links) failed because it dragged its anchor. The anchoring system was designed to withstand certain environmental conditions and modern design practice with reasonable factors of safety; vet mother nature found another curve ball in her endless bag of tricks. Although he is not the designer of this particular spar buoy, such surprises have been common in the life's work of Henri Berteaux, the author of this book.

As a newly hired engineer in the mid 1960s, Henri participated in an oceanographic cruise that included recovery of deep-ocean, data-collection moorings. Only one in five were recovered. For the next 25 years, patient, methodical experimentation with buoys, forensic evaluation of failed components, analysis and new design brought steady progress, ultimately leading to the publication of this guidebook. His offering allows the engineer to replace guesswork with appropriate engineering analysis and rational design principles. Beginning with a review of the types and purposes of moorings, interesting designs from ocean engineering experience are described in detail.

Berteaux has compiled a good introductory primer to concepts such as buoyancy, drag forces, and both analytic and numerical modelling techniques. The theory of dynamics comes next, with an appropriately heavy emphasis on the effects of surface-ocean waves on the heave and roll of buoys. Linear models of buoy response are shown, along with an essential introduction to the concepts of added mass and hydrodynamic damping. Response in random seas is discussed at some length, with useful examples of surface and subsurface mooring systems.

Berteaux then turns from describing the basic tools of analysis essential to understanding mooring behavior to the practical design of real mooring systems. Environmental factors, such as corrosion, icing, and fish bite, are introduced. Strumming is confronted as a serious problem in high-current applications.

Good mooring design is in the details of the materials, the fittings, and the terminations. All of these factors are carefully explained, along with valuable mechanical and material data.

The book closes with a discussion on deployment and retrieval--the two most critical moments in the life of most moorings. If you plan to throw something over the side and you want to get it back, you can greatly improve your chances by referring to this book.
COPYRIGHT 1993 Woods Hole Oceanographic Institution
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1993 Gale, Cengage Learning. All rights reserved.

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Author:Vandiver, J. Kim
Article Type:Book Review
Date:Jun 22, 1993
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