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Wave refraction near the coast causes wave crests to

  • A.increase their period as they approach the shore
  • B.travel faster in shallower water than in deeper water
  • C.turn so as to become more nearly parallel to the depth contours
  • D.turn so as to become perpendicular to the depth contours instead

Answer: C

The part of a crest in shallower water travels more slowly and the crest swings round. This is why waves arrive nearly shore parallel even when generated far offshore. Refraction is the reason the drift angle is usually small.

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