. Design of riprap revetments for protection against wave attack. Shore protection; Water waves. FIND: The height to which the riprap must extend above the design water level to prevent being exceeded by the runup. SOLUTION: It is necessary to compute ds/H^ to determine which figure to use in Stoa (1979). Since there is no clearly defined toe for this structure, a water depth of one-half the deepwater wavelength will be used (this is the depth where the waves first "feel" the bottom) dc = = - 0-5 x x ()2 = meters ( feet) therefore, dg Ho '
. Design of riprap revetments for protection against wave attack. Shore protection; Water waves. FIND: The height to which the riprap must extend above the design water level to prevent being exceeded by the runup. SOLUTION: It is necessary to compute ds/H^ to determine which figure to use in Stoa (1979). Since there is no clearly defined toe for this structure, a water depth of one-half the deepwater wavelength will be used (this is the depth where the waves first "feel" the bottom) dc = = - 0-5 x x ()2 = meters ( feet) therefore, dg Ho ' which leads to using Figure 4 (Fig. B-3 in Stoa, 1979). To use Figure 4, the wave steepness parameter is required, so gT2 x (): = 3 4 56789 10 Structure slope (cot 8) Figure 4. Relative runup for riprap slopes; ds/HQ = ; Hq/Kj- - Use this figure also for dsE0 > (from Stoa, 1979). 17. 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, distributor
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