Shared Flashcard Set

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shorelines
N/A
17
Geology
Undergraduate 3
12/07/2010

Additional Geology Flashcards

 


 

Cards

Term
jetty
Definition
rock walls used to protect harbor from sand deposition/storm waves
Term
groins
Definition
protect beaches that are losing sand from longshore drift
Term
breakwater
Definition
absorbs the force of large, breaking waves and provide quiet water nearshore
Term
consequences of breakwaters/jetties
Definition

  • breakwaters=allowed sand to build-up behind the breakwater and it threatened to fill in the anchorage
  • jetty=build two, and sand builds up against one jetty, and the beach next to it has barely any sand

 

Term
wave refraction
Definition
wave slows down, and changes direction or bends the waves
Term
long shore currents
Definition
water pushes both up the beach, toward land and along the beach parallel to the shore
Term
marine terrace
Definition
a broad gentle sloping platform that may be exposed at low tide, if the shore has a lot of tidal action
Term
long shore transport
Definition

erodes sand from the sea bottom and keeps them suspended.....and creates

  • spits
  • baymouth bars
  • tombolos

Term
spit
Definition
fingerlike ridge of sediment that extends out into open water
Term
baymouth bar
Definition
ridge of sediment that cuts a bay off from the ocean, and is formed by sediment migrating across what was earlier an open bay
Term
tombolo
Definition
bar of sediment connecting a former island to the mainland
Term
barrier island
Definition
ridges of sand that parallel the shoreline and extend above sea level, formed from sand eroded by waves from deeper water offshore, or they may be  elongated sand spits formed by longshore drift
Term

stacks

 

Definition
are erosional remnants of headlands left behind as the coast retreats inland. Rocky islands off retreating coasts
Term
arches
Definition
are bridges of rock left above openings eroded in headlands or stacks by waves. It is eroded in spots where the rock is weaker than normal, or with fractures
Term
wave-cut 
Definition
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