. Dolos design procedure based on Crescent City prototype data. Breakwaters; Structural analysis (Engineering); Hydraulic models; Hydraulic structures. present random boundary conditions and highly varying drag profiles (Fig- ure 3). Finally, the CAUs are generally unreinforced and because of their deep sections and irregular shape, the stress-strain behavior of the concrete is difficult to predict. Therefore, the design methods for any one CAU shape must be unlike any other coastal or land-based Figure 3. 42-ton dolosse at Crescent City, CA CAU design unlike any other 15. Until recen
. Dolos design procedure based on Crescent City prototype data. Breakwaters; Structural analysis (Engineering); Hydraulic models; Hydraulic structures. present random boundary conditions and highly varying drag profiles (Fig- ure 3). Finally, the CAUs are generally unreinforced and because of their deep sections and irregular shape, the stress-strain behavior of the concrete is difficult to predict. Therefore, the design methods for any one CAU shape must be unlike any other coastal or land-based Figure 3. 42-ton dolosse at Crescent City, CA CAU design unlike any other 15. Until recently, no general CAU structural engineering design tools were available. CAU design has been limited to determining the hydrodynamic stability using empirical formulae like the formulae developed by Hudson (1958) and more recently by van der Meer and Pilarczyk (1987). The hydro- dynamic stability design formulae generally assume that the critical design condition occurs when several armor units are displaced from their equilibrium positions, exposing the underlayer to direct wave action. The hydrodyna- mically stable weight determined from an empirical formula is typically verified in a physical model. 16. In a conventional hydrodynamic stability model study, the strength of the armor units is not scaled. The units are made of grout or polyester materials, which produce model strengths several orders of magnitude greater than scale. Thus, traditional design methods assume that the armor units will remain structurally intact. But experience has shown that a breakwater might 11. 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 Melby, Jeffrey A; United States. Army. Corps of Engineers; Coastal Engineering Research Center (U. S. ); U. S. Army Engineer Waterways Experiment Station. [Vicksburg, Miss. : U. S. Army En
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