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Understanding Coastal Hazards and Erosion Management Strategies

janine avatar
janine
19 diapositives · 335 Views · Aug 20, 2014

This semester, we focus on coastal hazards beyond just weather events, particularly coastal erosion and its implications. Key readings include essential pages that discuss the science behind how erosion occurs, the impact of hurricanes, and potential management strategies. Students will collaborate in groups to discuss and analyze a provided article on coastal erosion, exploring important scientific questions. Key topics include climate change effects, the role of wave energy, and mitigating erosion threats. Prepare for exams and finalize group projects addressing these urgent issues.

#understanding coastal hazards and erosion management strategies #understanding coastal hazards and erosion management strategies ppt #powerpoint #presentation
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  1. The rest of the semester • Today: coastal hazards (apart from weather) • F/M/W: stay tuned one moment • Friday 27th: 4th exam, review Weds. 25th 5 PM, here • M/W/F April 30/May 1/May 3: final group project on coastal hazards • W May 9, 10 - 12, final exam Please turn on your clicker

  2. Please click your first choice for next week • Climate change • Wildfires • Impacts and extinctions • Rivers and floods

  3. Please click your second choice for next week • Climate change • Wildfires • Impacts and extinctions

  4. TODAY: coastal hazards • READ • p. 226 - 232 (sure, read those pages again) • p. 243 - 246 (up to hurricanes) • p. 249 - 254 (“ “ “ ) • p. 260 - 261 (“Adjustment to coastal erosion”) • Be able to answer the Q’s on the handout

  5. In your group for ~10 minutes … • Read the article about coastal erosion • Anoint* a reporter, who will be prepared to discuss • what the article is about • what science the article explains well enough • what science the article infers you know something about/what terms are not explained well • what questions you have after reading the article *to install somebody officially or ceremonially in a position or office

  6. What is the article about? • Erosion of coastlines • Predictions over next 60 years • How to manage coastal erosion • Hazards and costs of damage

  7. What science is explained well enough? • How erosion occurs • How hurricanes affect erosion • How much erosion due to storms

  8. What science should you apparently know already/what terms aren’t explained? • What’s erosion? • Increased hurricane, but not why? • Sea level rising, but not why -- global warming? • What’s a hurricane

  9. Any other questions you have • How will erosion affect buildings -- ground or building itself • How to implement ideas to reduce threat of erosion? • What ideas are in circulation already? • What IS global warming? • Why spend so much money to move a lighthouse? Why not build another one?

  10. What is going on in coastal erosion? Why are 86,000 structures threatened along coastlines? • Wave energy: “the energy expended on a 400-km length of coastline with a height of 1 m is approximately equivalent to the energy produced by a nuclear power plant” • Whatever the height of the wave is (in meters), the energy is proportional to that amount squared

  11. Waves breaking on shore

  12. Wave refraction: waves break parallel to shore

  13. www.coastalchange.ucsd.edu/images/refraction2.jpg www.soton.ac.uk/ ~imw/harry.htm

  14. Longshore drift

  15. March, 1975 March, 2006 Jan., 1983 www.geol.ucsb.edu/faculty/sylvester/UCSBbeaches.html

  16. Jetties/groins/ breakwaters/ seawall to enhance beach development or protect harbors geology.uprm.edu/Morelock/GEOLOCN_/ coast/north/dorpho.jpg

  17. Jetties/groins/breakwaters/seawalls to enhance beach development

  18. Jetties/groins/breakwaters/seawalls to enhance beach development oceanica.cofc.edu/.../ guide/process3.htm

  19. In your group of 3-4 people, three things to do… • Draw picture A of a shoreline with longshore drift (doesn’t matter which direction) • You want to build a hotel on the beach, but you really don’t think there’s enough sand -- draw picture B of a likely resolution to that problem (including where your hotel will be) • Draw a picture C of the hotel on the next property “down-drift” and write a sentence about how the owner of that property might react