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21 Cards in this Set

  • Front
  • Back
What are the two types of coasts?
Erosional and
Depositional
Erosional coasts

-found where
-old/new
-Tectonically
-sediment
-features
New
Tectonically active
Rough Rock sediment
Volcanic activity by Equakes
Depositional coasts

-found where
-old/new
-Tectonically
-sediment
-features
East coast of U.S
Older
not active (@ equilibrium)
sediment not rocky
Which type of coast is shaped by the ocean, which is shaped by the land?
Depositional; erosional
In what direction does a longshore current travel?
parallel across the beach
Movement of sediment on the beach.
Swash- washes water and sediment ashore

Backwash- washes out to see

This zigzag adds up to a net longshore current
Barrier Islands probably formed when
coastal dunes were submerged during sea level rise.
How are estuaries formed?
Form where rising sea level drowns old river valleys
Most longshore drift will be toward
the South in the Northern hemisphere (because most waves come from the North).
Features of a beach
Berm-Flat accumulation of sediment on beach above high tide line
Beach Scarp-A vertical face, cut by wave action-marks high tide
Longshore Trough-Below the low tide mark, Scoured by currents
Longshore Bar-Submarine sand ridge, parallels shore, Made from sand removed from the beach
Summer beaches vs. winter beaches. What causes the difference?
Summer beach- less energetic waves and so sand moves up on land (wider and steeper beaches)

Winter beaches- more energy and sand is moved off the beach to sand bars.
What are ripcurrents?
The quick current taking water back out to the ocean after it washed up on shore from several locations.
How do you know where there may be a ripcurrent?
Flater waves, depression on the beach and murky water
How do you get out of one?
swim parallel to the beach until you hit the water coming to shore that is supplying the water for the current.
The sea level is expected to rise by at least
30 cm by 2025
The sea level is expected to rise by at least
30 cm by 2025
The sea level is expected to rise by at least
30 cm by 2025
Sea level is expected to rise by
30 cm by 2025
what is a groin?
Extend from the beach into the water
Designed to interrupt longshore drift
Sand accumulates on the up current side
what is a jettie?
Designed to prevent longshore drift from blocking harbor entrances
Similar to groins
Deposition upcurrent
what are breakwaters?
these are the ones put paralell to the beach