. Design of riprap revetments for protection against wave attack. Shore protection; Water waves. I 2 3 4 6 8 10 20 30 40 60 80100 Structure Slope (Cot 9) Figure 7. Relative runup for smooth slopes on a 1 on 10 bottom; 2,/L > ; ds/H£ = (from Stoa, 1978). Hs + (Hs/L0)1/2 cot 6 + ()() and the maximum runup is •5> - (M(fe) = = Rs (1. () = ()()() = meters ( feet). Computations shown above were performed for the other slopes and are tabu- lated in Table 6. Table 6 also shows some additional data (, th
. Design of riprap revetments for protection against wave attack. Shore protection; Water waves. I 2 3 4 6 8 10 20 30 40 60 80100 Structure Slope (Cot 9) Figure 7. Relative runup for smooth slopes on a 1 on 10 bottom; 2,/L > ; ds/H£ = (from Stoa, 1978). Hs + (Hs/L0)1/2 cot 6 + ()() and the maximum runup is •5> - (M(fe) = = Rs (1. () = ()()() = meters ( feet). Computations shown above were performed for the other slopes and are tabu- lated in Table 6. Table 6 also shows some additional data (, the length of the revetment) to provide information for comparing the advantages of the various slopes. The length of the revetment is the slant length distance from the toe to the top of the riprap as determined by the chosen value of RmaxJ , length of revetment = (ds + Rmax) (1 + cot2 G)1/2. Table 6 shows that the 1 on slope has the shortest length and re- quires the smallest quantity of armor per meter. The length for each slope was calculated using Rmax as estimated by the method of this report. The weight of stone per meter is the product of rmin, the slope length, the unit weight, and minus the porosity. The unit weight is 2,644 kilograms' per cubic meter and the porosity is assumed to be Since the 1 on slope needs the least armor stone per meter it may have the lowest first costs; however, in some locations it might be cheaper to purchase smaller stone for a flatter slope. Problems with the 1 on slope include the 27. 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; Coastal Engineering Research Center (U. S. ). Fort Belvoir, Va. : U. S. Army, Corps of Engineers, Coastal Engineering Research Center ; Springfield, Va. : National Technical Information Service, distr
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