Home
Flashcards
Preview
O Lecture 10/12/10
Home
Get App
Take Quiz
Create
When is the tidal range the greatest?
New/full moon
When is the tidal range the least?
quarter moons
What is it called when tidal range the greatest?
Spring Tide
What is it called when tidal range the least?
Neap tide
Why are there unequal tides?
because of the angle between the Sun, Moon, and Earth
What is another complicating factor of tides?
eliptical path of earth
What percent of people live within easy access of the coast?
80 %
What percent of the global population lives within 100 km of the coast
40%
coastlines
dynamic and interactive
change with time
product of their environment
inputs
depositional processes
outputs
erosional processes
What causes depositional and erosional processes?
wind
waves
Drivers
wave/wind conditions
slope and sources material
beach
entire active are of the coast that experiences changes due to breaking waves
coast
extends inland as far as coastal features can be found
coastline - definition
marks boundary between shore and the coast
offshore
deep enough waves don't hit bottom
nearshore
never exposed - not even at low tide
foreshore
intertidal or littoral zone
backshore
above high tide line - only covered in water in really big storms
berm
dry, gentle sloping region at the foot of coastal cliffs or dunes
beach face
wet, gentle sloping region from berm to shoreline
composition of beaches
locally available material
could be coarse or fine
Beach Material Charactersitics
slope of beach helps determine material of beach
eg
: boulders from local cliff, significant biological material at tropical beaches
beaches typically dominated by...
either erosion or deposition
erosional beach characteristics
well developed cliffs
Pacific
depositional beach characteristics
sand deposits, off shore barrier islands - Atlantic
How can material on the beach move?
perpendicular or parallel
Perpendicular movement
in or out
Parallel movement
upcoast or downcoast
How is upcoast and downcoast determined?
by the dominant flow in that region
What are the two types of waves that perpendicular movement can have?
Swash
Backwash
Swash
moves up
backwash
net movement of water out - normally wave breaks on top of it
In light wave activity in perpendicular movement which wave dominates?
swash
Where do sediments move in light wave activity and perpendicular movement?
to the shore
How does the beach look that is formed by light wave activity and perpendicular movement?
wider beach
What is a beach light wave activity with perpendicular movement called?
fair weather beach/summertime beach
What type of wave movement dominates on a heavy wave beach with perpendicular movement?
backwash
Where do sediments move in heavy wave activity and perpendicular movement?
away from shore
How does the beach look that is formed by heavy wave activity and perpendicular movement?
narrower beach
sand bars form
What is a beach with heavy wave activity and perpendicular movement called?
stormy weather/wintertime beach
Author
green29dive5
ID
43038
Card Set
O Lecture 10/12/10
Description
Recap Tides, Coastal Features
Updated
2010-10-18T16:27:28Z
Show Answers
Home
Flashcards
Preview