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Title: Stability of rubble-mound breakwaters : hydraulic model investigation
Authors: United States. Bureau of Yards and Docks
U.S. Army Engineer Waterways Experiment Station
Keywords: Breakwaters
Rubble-mound breakwaters
Hydraulic structures
Coastal structures
Wave action
Hydraulic models
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Description: Technical Memorandum
Summary: The investigation reported herein was undertaken originally to determine whether the breakwater proposed for construction at Roosevelt Roads, Puerto Rico, would be adequate to withstand the attack of the largest waves occurring at the breakwater site. Shortly after the model investigation was undertaken the Roosevelt Roads breakwater project became of less importance from a military standpoint, and it was decided to discontinue further tests on the original problem. Because of the lack of knowledge concerning the phenomena of waves attacking rubble mounds, the Bureau of Yards and Docks decided to broaden the scope of the investigation to include a study of problems of a general nature. The investigation was conducted in a 5-ft-by-18-ft-by-119-ft concrete flume. Models with linear scales of 1:30, 1:45 and 1:60 were used. First, it was determined that model-prototype transference equations based upon the Froudian relationships were applicable to all important motion occurrences affecting the stability of rubble-mound breakwaters. Then data were obtained on: the stability of component breakwater materials during various stages of construction; the accuracy of the Iribarren and Epstein-Tyrrell formulas for design of rubble breakwaters; coefficients of reflection of waves from rubble breakwaters; and the effect of angle of incidence of wave attack on the stability of rubble breakwaters. The most important findings of the investigation concerned the use of Iribarren's formula for design of rubble breakwaters. The coefficient in Iribarren's formula was found to vary appreciably with slope of the seaside face. The Iribarren formula is believed sufficiently accurate for design of rubble breakwaters if used in conjunction with coefficients such as those developed during the model tests.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Memorandum

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