Accession Number : AD0786369

Title :   Flexible Breakwaters.

Descriptive Note : Final rept. Feb-Jun 73,

Corporate Author : CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF

Personal Author(s) : Jones,D. B.

Report Date : SEP 1974

Pagination or Media Count : 63

Abstract : Several apparent advantages related to logistics are noted for a floating blanket type of transportable breakwater. However, thin surface covers are not very effective as wave barriers. (The known data on water-wave damping by shallow-draft barriers of many kinds are reviewed, and the data are reproduced in the appendix.) To more fully examine the potential of thin, flexible barriers, a supplementary process for reducing wave energy that has not been exploited heretofore--dissipation in a viscoelastic solid--is investigated; the linear theory is used to derive a formula which relates energy dissipation in an impervious viscoelastic blanket to wave height reduction. Numerical results for a high-damping rubber indicate that energy dissipation in a thin surface cover cannot satisfactorily supplement other processes and mechanisms if the wave period is greater than 2 or 3 seconds. (Author)

Descriptors :   *Breakwaters, Flotation, Transportation, Barriers, Flexible structures, Numerical analysis, Damping, Ocean waves, Dissipation, Viscoelasticity, Rubber

Subject Categories : Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE