Transport and deposition

• Longshore drift 


  The movement of sediment along the coast
• tides 


  Changes in the water level cause by the gravitational Pull of the moon. In the uk we have two high and low tides a day.
• tidal range 


  the difference in height between high and low tides
• High tidal range 


  Will lead to strong tidal currents.

  strong near estuaries

  key in transporting sediment
• four processes of transport 


  suspension

  solution

  saltation

  traction
• suspension 


  fine particles of silt hanging in the water
• solution 


  minerals dissolved in water
• saltation 


  stones and pebbles bounce along the channel and hit each other
• traction


  this is when rocks and boulders are rolled along the riverbed by the force of water
• Sediment cells


  They act as systems which inputs (sources), processes (transfers or flows) and outputs.
• Sediment budget 


  The amount of sediment available within a cell
• what happens if sediment budgets fail

  it can cause erosion
• what happens if sediment budget increases

  negative feedback occurs, thus deposits sediment
• what is the sediment budget also knows as?

  dynamic equilibrium
• what is a beach

  the accumulation of material deposited between high and low tidal limits.
• what are the 3 zones in a beach

  Backshore

  Foreshore

  Offshore
• Where is coarse material found 


  In backshore and foreshore zones as littoral deposits
• where is finer material found 


  in the offshore zone as neuritis deposits
• what is above HWM (high water mark)


  coarse material pushed up the beach by spring tides

  It flings materials well above normal tidal waves level.