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, (10[2]-5[1])which (10[2])are (10[1])caused by (10[2])a longer fetch. (10[1]-5[1])Collisions between these (10[1])phenomena (10[1]-5[1])form their large and destructive “rogue” (10[2])type. (10[7])These (10[1])phenomena (10[3])recede (10[3]-5[1])perpendicularly (10[1]-5[1])before (-5[1])returning at an (10[1])oblique (10[1])angle (10[1])when transporting (-5[1])sediment through longshore drift. (10[1]-5[2])For 10 points, (-5[1])shoaling (10[1]-5[1])involves a change (10[3])in what phenomena’s height, (10[1])which is (10[2])measured from crest (10[1])to trough? (10[5])■END■ (10[16]0[2])