. Characteristics of reef breakwaters. Breakwaters; Ocean waves; Water waves. SPECTRAL STABILITY NUMBER Ns« Figure 10. Reef breakwater response slope versus the spectral stability number for stability subsets 1, 3, 5, 7, and 9 since the natural angle of repose for gravel is about 45 deg, giving C = for a triangular reef cross section with side slopes of IV on 1H. Equation 7 can be compared to the observed data in Figure 10. It is surprising that the response slope of the reef, stone size and density, and severity of wave attack can all be linked with a relation as simple as that in Equatio
. Characteristics of reef breakwaters. Breakwaters; Ocean waves; Water waves. SPECTRAL STABILITY NUMBER Ns« Figure 10. Reef breakwater response slope versus the spectral stability number for stability subsets 1, 3, 5, 7, and 9 since the natural angle of repose for gravel is about 45 deg, giving C = for a triangular reef cross section with side slopes of IV on 1H. Equation 7 can be compared to the observed data in Figure 10. It is surprising that the response slope of the reef, stone size and density, and severity of wave attack can all be linked with a relation as simple as that in Equation 7. It is difficult to add secondary stability variables to an equation like Equa- tion 7 and improve the ability to predict the response slope over Equation 7 very much. At the same time it is clear from Figure 9 that secondary stabil- ity factors have some influence on reef stability. After trial and error the following equation was developed which includes one secondary stability vari- able and does a better job of predicting the response slope of the reef: C = —7y = exp N* + h' (8) where the relative "as built" crest height of the reef h'/d was added to an c s equation like Equation 7 to improve the predictive ability. Equation 8 23. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ahrens, John P; United States. Army. Corps of Engineers; U. S. Army Engineer Waterways Experiment Station; Coastal Engineering Research Center (U. S. ). [Vicksburg, Miss. : U. S. Army Engineer Waterways Experiment Station ; Springfield, Va. : available from National Technical Information Service]
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