transmission coefficient has been obtained mainly by the observation of 

 wave reflection from the submerged structure. The theoretical analysis 

 of wave breaking is very difficult because of its complexity. However, 

 the wave energy dissipation by a submerged breakwater is maximized by 

 inducing the wave breaking on the structure. 



This report mainly deals with energy dissipation due to breaking 

 on a submerged breakwater and offers experimental data for practical us 

 To investigate the scale effect of the experimental results, a compari; 

 between experimental data and field data is presented. 



134. NANCE, T.F., and HIROTA, P.M., "Magic Island ... Ten Years After," 

 Shore and Beach ^ Vol. 42, No. 2, Oct. 1974, pp. 19-22. 



Keywords: Armor Stability, Beach fill, Environmental concerns, Hawaii 

 (Ala Wai Peninsula, Magic Island, and Waikiki) , Littoral 

 transport. Rubble mound. Segmented breakwater, Structural 

 dimensions. Wave diffraction, Wave overtopping 



In 1964 the Ala Wai Peninsula was completed as the first phase of 

 the Magic Island complex. The rest of the project was never constructed 

 because of environmental objections. The project utilizes a series of 

 detached breakwaters to retain a recreational beach. The performance of 

 the project after 10 years is evaluated. 



135. NATAL' CHISHIN, G.D., "Determination of Wave Forces on Submerged 

 Shore Protection Breakwaters in Shallow Waters," G-idrote'khnioheskoe 

 Stroitel'stvOi No. 4, Apr. 1974, pp. 42-44 (in Russian--translation 

 available in CE'RC library) . 



Keywords: Concrete structures, Hydraulic model (two-dimensional). 



Structural stability. Submerged breakwater, U.S.S.R. (Odessa), 

 Wave attenuation. Wave pressure. Wave setup 



The use of submerged concrete breakwaters has become widespread 

 in the Odessa region of the Black Sea coast. Investigations were made 

 and results are presented on the wave suppression effect, wave pressures, 

 wave setup, and maximum bed velocities to be used for design of these 

 structures. 



136. NIHON TETRAPOD CORPORATION, "Nihon No Uni To Riku" (Sea and Land of 

 Japan), Tokyo, Japan, 1976. 



Keywords: Armor units. Detached breakwater, Japan (Hamada, Nishikinohama- 

 Kaizuka, and Shinmatsubara-Okagakicho) , Segmented breakwater. 

 Structural dimensions, Tetrapods 



A company brochure with illustrations of coastal projects in Japan. 

 Numerous color photos, maps, and figures are included. Several detached 

 breakwater installations are presented. 



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