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, which are caused by a longer fetch. (-5[1])Collisions between these (10[1])phenomena form their large and destructive “rogue” (10[1])type. (10[1])These phenomena recede perpendicularly before (-5[1])returning at an oblique angle when transporting sediment through longshore drift. For 10 points, shoaling involves a change (10[1])in what phenomena’s height, (10[1])which is measured from crest (10[1])to trough? ■END■ (10[4])