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21 Cards in this Set
- Front
- Back
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What are the two types of coasts?
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Erosional and
Depositional |
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Erosional coasts
-found where -old/new -Tectonically -sediment -features |
New
Tectonically active Rough Rock sediment Volcanic activity by Equakes |
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Depositional coasts
-found where -old/new -Tectonically -sediment -features |
East coast of U.S
Older not active (@ equilibrium) sediment not rocky |
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Which type of coast is shaped by the ocean, which is shaped by the land?
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Depositional; erosional
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In what direction does a longshore current travel?
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parallel across the beach
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Movement of sediment on the beach.
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Swash- washes water and sediment ashore
Backwash- washes out to see This zigzag adds up to a net longshore current |
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Barrier Islands probably formed when
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coastal dunes were submerged during sea level rise.
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How are estuaries formed?
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Form where rising sea level drowns old river valleys
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Most longshore drift will be toward
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the South in the Northern hemisphere (because most waves come from the North).
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Features of a beach
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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 |
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Summer beaches vs. winter beaches. What causes the difference?
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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. |
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What are ripcurrents?
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The quick current taking water back out to the ocean after it washed up on shore from several locations.
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How do you know where there may be a ripcurrent?
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Flater waves, depression on the beach and murky water
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How do you get out of one?
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swim parallel to the beach until you hit the water coming to shore that is supplying the water for the current.
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The sea level is expected to rise by at least
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30 cm by 2025
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The sea level is expected to rise by at least
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30 cm by 2025
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The sea level is expected to rise by at least
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30 cm by 2025
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Sea level is expected to rise by
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30 cm by 2025
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what is a groin?
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Extend from the beach into the water
Designed to interrupt longshore drift Sand accumulates on the up current side |
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what is a jettie?
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Designed to prevent longshore drift from blocking harbor entrances
Similar to groins Deposition upcurrent |
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what are breakwaters?
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these are the ones put paralell to the beach
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