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 (10[1])types of these phenomena, which are caused by a longer fetch. Collisions between these phenomena form their large and destructive “rogue” type. These (10[1])phenomena recede (-5[1])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■