Coastal erosion

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Description of erosional processes at the coast

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Coastal erosion

  1. 1. <ul><li>Corrasion </li></ul><ul><ul><li>Cobbles, pebbles and gravel carried by waves hurled against the coasts cut and break the rocks </li></ul></ul><ul><ul><li>Most aggressive mode of erosion </li></ul></ul><ul><li>Attrition </li></ul><ul><ul><li>Materials carried by waves knock against each other resulting in smaller, smoother and rounded pieces </li></ul></ul>EROSION: Recap!
  2. 2. <ul><li>Solution </li></ul><ul><ul><li>Soluble minerals in rocks dissolved and removed by seawater. </li></ul></ul><ul><ul><li>Calcium carbonate (limestone) reacts with carbonic acid to form soluble calcium hydrogencarbonate. </li></ul></ul><ul><li>Hydraulic Action </li></ul><ul><ul><li>Weight of waves smash against the coast weaken and loosen the rocks </li></ul></ul><ul><ul><li>Water surges into cracks, joints and faults compresses the air </li></ul></ul><ul><ul><li>Pressure builds up and widens cracks </li></ul></ul>EROSION: Recap!

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