EESB18H3 Lecture : EESA05 - Environmental Hazards - Lec 10 (near-verbatim).docx
22 Jan 2013
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Remediation techniques to keep currents/waves back to prevent erosion. A small rise in sea level leads to a large migration of the barrier island; movement of sand deposits/mound closer to the shore where it"s more shallower. During the last deglaciation, sea levels rose about 130 m, and this rise was so rapid that most offshore sand bodies are still moving inland to compensate. Developed barrier islands are a hazard for this reason. Hog island is migrating inland, leading to the the loss of the town of broadwater. Waves increase in size with the following factors: wind velocity, length of time that the wind blows. Larger waves created by longer storms: fetch: the distance of water over which the wind blows, so, if you have higher wind velocity, longer storm and longer fetch will create mch larger wave. The wave is round/orbital; if on the wave, will bob up and move forward, go down and move back.
