Today I found two really interesting education websites for classrooms. The first website shows examples of wave erosion against a sea stack. The series of images shows the demise of Jump-off Joe, a sea stack at Nye Beach, near Newport, Oregon. Sea stacks begin as part of a headland or sea cliff. Relentless pounding by waves erodes the softer, weaker parts of the rock first, leaving harder, more resistant rock behind. It took over 100 years to erode this sea stack to sand.
The second interesting teaching site is a flash animation demonstration wave refraction against headlands. The reason why you find lots of erosion and cliffs along headlands is because the waves are refracted inwards concentrating the wave pressure on that particular area. I guess that also explains why you tend to get much rougher water near headlands. Makes sense.
Headland ErosionTuesday, 26 December 2006
Published in: Boring Site News
David Johnston has been introducing people to the sport of sea kayaking for the past 15 years. He is a senior instructor trainer with Paddle Canada and teaches for several paddling schools in Ontario, Canada. Full Bio.