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The Sea (Geography) (Waves (processes of coastal erosion (hydraulic action…

- - - - water force erodes
    - - loose material picked up and erodes when thrown back
    - - dissolving of rocks
    - - rocks hitting each other smooth and shrink, eventually form sand
    - - air trapped against rocks by wave, wave moves away, air released quickly, repeatedly until rock shatters
- - - - source of food, coastal regions people rely on fishing for income
      - fishing provides jobs on trawlers
      - Kiillybegs Donegal, Coastal Community
    - - heavy raw materials transported by cargo ships
      - ferries from Rosslare, Cork and Dublin transport to England and France, contributes to tourism
    - - sea and beaches provide recreational activities, surfing, kayaking, sunbathing
      - coastal towns benefit from tourists attracted to area
  - - - break incoming waves, have curved tops to push waves back
      - can be damaged in storms and need repair
      - Salthill Galway and Strandhill Sligo
    - - large boulders base of cliff / dunes,wave breaks, hits armour and loses energy, reduces erosion
      - protect coastline at Tramore Waterford
    - - wooden concrete structures built right angle to coast
      - extend into sea from land, trap sediments, longshore drift, to stop erosion of sand
      - negative impact however, sand trapped in one place no deposition later on, waves erode more
    - - Gabions wire cages of small stones, placed in front of beaches / dunes to break power of waves
      - Lahinch Clare
- - - - waves approach land at an angle matching prevailing wind, swash moves load up the shore and deposits, waves break angle load moves along
    - - backwash carries material back down shore, follows slope of beach, straight line, repeated over and over, movement in a zigzag