Geo Lab: Coastal Landscapes
tectonic activity
cooling lava can form land
beach nourishment
dumping new sand onto eroding beaches to restore them
wave cut bench
flat, wave-eroded surface
sea arch
arch formed by wave erosion when caves on opposite sides of a headland unite
seawall
barrier constructed to prevent waves from reaching the area behind the wall
sea stack
column of rock remaining after collapse of a sea arch
tidal range
difference in levels of ocean water at high tide & low tide
longshore drift
e movement of water and sediment down a beach caused by waves coming in to shore at an angle
headlands
eroded faster b/c they receive more wave energy from refraction
Wave-cut notch
hollow eroded by the impact of waves at foot of a cliff
emergent shoreline
land rises as sea level drops
submergent shoreline
land subsides as sea level rises
jetties
pair of structures extending into ocean at entrance to a harbor or river that are built for purpose of protection against storm waves & sediment deposition
Submergent Shoreline features
prominent bays, irregular coastlines, lagoons, islands, & marshes
weather & climate
responsible for continental glacial ice expansion & melting
shoreline materials
rocky, sandy, coral reef, mangrove forest, salt marsh, & seawall
emergent shoreline features
straight & bounded by steep cliff
erosional coasts
visible by wave erosion which move molecules in circular path
breaker zone
wave base intersect seafloor = waves lose symmetry
shoreline formation factors
weather, climate, tectonic activity, tidal range, & shoreline materials
longshore drift direction
where sediment is trapped behind jetty = on left of jetty if coming from left
