First five spatial eigenfuntions of beach profiles at four study sites. (a) Narrabeen
Beach; (b) Milford-on-Sea beach; (c) Hasaki coast; and (d) Joetsu-Ogata coast. Primary
axis corresponds to SEOF2 to SEOF5. Secondary axis corresponds to SEOF1. Dark black
line resembles mean profile. Black line SEOF2, red line SEOF3, blue line SEOF4 and green
line SEOF5.