the rest of the semester today: coastal hazards (apart from weather) f/m/w: stay tuned one moment...
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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
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Please click your first choice for next week
1. Climate change
2. Wildfires
3. Impacts and extinctions
4. Rivers and floods
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Please click your second choice for next week
1. Climate change
2. Wildfires
3. Impacts and extinctions
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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
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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
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What is the article about?
• Erosion of coastlines
• Predictions over next 60 years
• How to manage coastal erosion
• Hazards and costs of damage
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What science is explained well enough?
• How erosion occurs
• How hurricanes affect erosion
• How much erosion due to storms
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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
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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?
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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
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Waves breaking on shore
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Wave refraction: waves break parallel to shore
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www.coastalchange.ucsd.edu/images/refraction2.jpg
www.soton.ac.uk/ ~imw/harry.htm
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Longshore drift
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March, 1975
Jan., 1983
March, 2006
www.geol.ucsb.edu/faculty/sylvester/UCSBbeaches.html
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Jetties/groins/ breakwaters/
seawall to enhance beach development or protect harbors
geology.uprm.edu/Morelock/GEOLOCN_/coast/north/dorpho.jpg
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Jetties/groins/breakwaters/seawalls to enhance beach development
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Jetties/groins/breakwaters/seawalls to enhance beach development
oceanica.cofc.edu/.../ guide/process3.htm
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In your group of 3-4 people, three things to do…
A. Draw picture A of a shoreline with longshore drift (doesn’t matter which direction)
B. 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)
C. 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