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

Please click your first choice for next week

1. Climate change

2. Wildfires

3. Impacts and extinctions

4. Rivers and floods

Please click your second choice for next week

1. Climate change

2. Wildfires

3. Impacts and extinctions

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

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

What is the article about?

• Erosion of coastlines

• Predictions over next 60 years

• How to manage coastal erosion

• Hazards and costs of damage

What science is explained well enough?

• How erosion occurs

• How hurricanes affect erosion

• How much erosion due to storms

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

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?

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

Waves breaking on shore

Wave refraction: waves break parallel to shore

www.coastalchange.ucsd.edu/images/refraction2.jpg

www.soton.ac.uk/ ~imw/harry.htm

Longshore drift

March, 1975

Jan., 1983

March, 2006

www.geol.ucsb.edu/faculty/sylvester/UCSBbeaches.html

Jetties/groins/ breakwaters/

seawall to enhance beach development or protect harbors

geology.uprm.edu/Morelock/GEOLOCN_/coast/north/dorpho.jpg

Jetties/groins/breakwaters/seawalls to enhance beach development

Jetties/groins/breakwaters/seawalls to enhance beach development

oceanica.cofc.edu/.../ guide/process3.htm

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