Coastal Hazards
.pdf
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School
College of Charleston *
*We aren’t endorsed by this school
Course
103L
Subject
Geology
Date
Dec 6, 2023
Type
Pages
4
Uploaded by UltraEnergy6947
1
•
You will need:
o
Internet
o
Laboratory Manual for Introductory Geology,
Chapter 17 Shorelines
o
The PowerPoint slides presentation on OAKS
Environmental Geology 103L
Name
COASTAL PROCESSES
PART 1: How Coasts Form
A.
Materials from which coasts are made:
Watch this video and answer the following questions:
https://www.youtube.com/watch?v=pxmHHoTPSKI
1.
Which mineral comprises the sand on most beaches?
2.
Where does sand come from?
3.
How is the sediment that becomes sand transported to the coast?
4.
Why are most beaches made of sand and not large pebbles? (Hint: think energy of transportation!)
5.
Why are silt and clay deposited offshore and not on the beach?
6.
When rock is weathered and becomes sediment it is called (Circle one):
EROSION
or
DEPOSITION
7.
When that sediment settles out (ex. on the beach) it is called (Circle one):
EROSION
or
DEPOSITION
8.
Are ALL beaches made of the mineral Quartz?
9.
If not, what are some examples of where sand on other beaches comes from?
10.
.
Below, identify which image belongs to which sediment type: SAND, SILT/CLAY, or PEBBLES:
a. _____
_
b. ____
_
c. ______
2
Below, name where you think each type of sediment from the above pictures would be deposited: RIVER, BEACH, or
DEEP OCEAN. Then indicate WHY it would settle there, by picking the energy level where it is deposited:
11.
.
IMAGE a from #10.
a.
WHERE would it settle out (pick one)?
RIVER
BEACH DEEP OCEAN
b.
WHY (pick one)? HIGH ENERGY
MEDIUM ENERGY LOW ENERGY
12.
.
IMAGE b from #10.
a.
WHERE would it
settle out (pick one)?
RIVER
BEACH DEEP OCEAN
b.
WHY (pick one)? HIGH ENERGY
MEDIUM ENERGY LOW ENERGY
13.
.
IMAGE c from #10.
a.
WHERE would it settle out (pick one)?
RIVER
BEACH DEEP OCEAN
b.
WHY (pick one)? HIGH ENERGY
MEDIUM ENERGY LOW ENERGY
B.
What determines the shape and features of a coast?
15.
See
LAB CHAPTER 17 SHORELINES
Section 17.2 on pg.432-433
of your manual. What force dominates shoreline
erosion?
16.
What controls this force?
17.
What other factors can have a profound effect on shorelines?
18.
See
Fig.17.1 on pg.433
of your manual. Which shoreline do you think was formed by glaciers during the last ice age?
19.
See
Section 17.3.1 on pg. 444
of your manual. How do waves form?
Watch this video and answer the following questions:
https://www.youtube.com/watch?v=U9EhVa4MmEs
20.
Do waves approach the shoreline parallel to the beach?
21.
How does the wave angle of approach move sand along a beach?
22.
What is longshore drift?
23.
See
Section 17. 2.5 on page pg. 437
of your manual. Answer the following:
a.
What causes long-terms sea-levelchanges?
b.
What is a submergent shoreline?
c.
What are some features of a submergent shoreline?
d.
What is an emergent shoreline?
e.
What are some features of an emergent shoreline?
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