The power distribution of these phenomena is plotted on the Pierson–Moskowitz spectrum. Averaging the largest third of a sample of these phenomena is used to calculate a “significant” measure of their size denoted H-sub-s. The tangent of alpha over the square root of the relative size of these phenomena equals the Iribarren number. Groins dissipate high-energy types of these phenomena, (10[2]-5[1])which (10[2])are (10[1])caused by (10[1])a longer fetch. (10[1])Collisions between these phenomena (10[1])form their large and destructive “rogue” type. (10[1])These phenomena recede perpendicularly before returning at an oblique angle when transporting sediment through longshore drift. For 10 points, shoaling involves a change in what phenomena’s height, which is measured from crest to trough? (10[1])■END■