Transcript TODAY`S ANNOUNCEMENTS - NAU jan.ucc.nau.edu web server

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.
2.
3.
4.
Climate change
Wildfires
Impacts and extinctions
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
March, 2006
Jan., 1983
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