Robert D. Carver

Robert R. Bottin

Claude E. Chatham

Hydraulic Model Investigation

Waianae Small-boat Harbor, Oahu, Hawaii, Design for Wave Protection

Michael Jeffrey Briggs

Coastal Model Investigation

Newport North Marina, Yaquina Bay, Oregon, Design for Wave Protection

Hugh F. Acuff

A 1:90-scale (undistorted) three dimensional coastal hydraulic model was used to investigate the design of proposed navigation improvements at Nome Harbor, Alaska, with respect to wave, current, and shoaling conditions at the site. The model reproduced about 3,350 m (11,000 ft) of the Alaskan shoreline, the existing harbor and lower reaches of the Snake River, and sufficient offshore bathymetry in the Norton Sound to permit generation of the required experimental waves. The model was used to determine the impacts of a new entrance channel on wave-induced current patterns and magnitudes, sediment transport patterns, and wave conditions in the new channel and harbor area, as well as to optimize the lengths and alignments of new breakwaters and causeway extensions. A 24.4-m-long (9O-ft-1ong) unidirectional, spectral wave generator, and automated data acquisition and control system, and a crushed coal tracer material were utilized in model operation. It was concluded from study results that: a) existing conditions are characterized by rough and turbulent wave conditions in the existing entrance. Very confused wave patterns were observed in the entrance due to wave energy reflected off the vertical walls lining the entrance. Wave heights in excess of 1.5 m (5 ft) were obtained in the entrance for typical storm conditions; and wave heights of almost 3.7 m (12 ft) were obtained in the entrance for 5O-year storm wave conditions with extreme high-water level (4 m (+13 ft); b) wave conditions along the vertical-faced causeway docks were excessive for existing conditions. Wave heights in excess of 3.7 and 2.7 m (12 and 9 ft) were obtained along the outer and inner docks, respectively, for typical storm conditions; and wave heights of almost 7 and 5.8 m (23 and 19 ft) were recorded along these docks, respectively, for 5-year storm wave conditions with extreme high-water levels.

Design for Navigation Improvements at Nome Harbor, Alaska

Gregory L. Williams

Sedimentation and Hydrodynamics Study of U.S. Coast Guard Station Boat Basin, Port Huron, Michigan

San Juan National Historic Site, San Juan, Puerto Rico, Design for Prevention of Wave-induced Erosion

Marvin Glynn Mize

Zeki Demirbilek

Camp Ellis Beach, Saco Bay, Maine, Model Study of Beach Erosion

Robert R. Bottin

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