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19 Cards in this Set
- Front
- Back
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Why do people live near the coast? |
Population centers, aesthetics |
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Western US Coastline |
Active margins, plate tectonic activity, dramatic coastlines with cliffs and steep drop offs. |
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Eastern US Coastline |
Passive margins, no plate tectonic activity, extensive beaches, shallow drop offs. |
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Beaches |
Sedimentary deposit at water/land interface. |
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Waves, winds, and streams. |
Forces of erosion and deposition.
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Waves |
Movement of wind across the ocean surface, water molecules grows smaller with depth, wave "breaks" as water shallows and orbits feel the bottom. |
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Wave erosion |
Mechanical from pounding of breakers. Milling/abrasion: material propelled by waves. Chemical from dissolution of rock. |
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Bulging of the water at Earth's surface due to: |
Earth's rotational velocity, gravitational pull of moon, gravitational pull of sun. |
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Spring tides |
Gravitational pull of sun and moon in unison |
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Neap tides |
Gravitational pull of sun and moon perpendicular |
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Long term effects on sea water level |
Glaciation (transfer of water between ocean and ice), tectonics, groundwater extraction and oil extraction. |
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Evidence of sea level change |
Wave cut platforms on rocky shores. Drowned valleys and fjords. |
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Longshore current and littoral drift |
Component of water and sediment movement is along the beach. |
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Groins |
Human effort to stabilize beach at certain location, mitigate effect of longshore drift, modification of natural profile. |
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Deposition |
Occurs where water locally slows down.
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Erosion |
Occurs where sediment load capacity locally increases. |
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Beach restoration efforts |
Many failures from natural erosion and improper choice of mineralogy for replacement sand. |
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Cliff erosion |
Removal of sediment at/under waterline is undercutting and swift erosion. |
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Wave refraction |
Focuses energy on headlands/protrusions tendency to flatten out coastal profile. |
