Swash And Backwash

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Swash And Backwash

  1. 1. Learning Objectives <ul><li>To be able to understand the difference between destructive and constructive waves. </li></ul>
  2. 2. Why are waves generally larger in the south west than in the south east? Wave energy depends on the fetch , the strength of the wind and the length of time over which the wind has blown. fetch = the distance over which the wind has blown The longer the fetch the stronger the wave.
  3. 3. wavelength The bottom of the wave touches the sand, slows down and the top of the wave topples over. This causes the wave to break. So what happens when a wave hits the beach?
  4. 4. Types of Waves <ul><li>There are 2 types of waves: </li></ul><ul><li>destructive & constructive </li></ul><ul><li>The link below shows you these: </li></ul><ul><li>http://www.curriculumbits.com/prodimages/details/geography/geo0003.html </li></ul>
  5. 5. <ul><li>Backwash is stronger that their swash so they remove material from the beach. </li></ul><ul><li>They are frequent in number – between 10-15 a minute </li></ul><ul><li>They are tall so have more power when they break scouring away at beach material. </li></ul><ul><li>They create a steep narrow beach. </li></ul>
  6. 6. <ul><li>Their swash is stronger than their backwash causing them to deposit material on the beach. </li></ul><ul><li>They are less frequent – 6-9 a minute </li></ul><ul><li>Long but not high waves so they roll onto the beach so do not erode. </li></ul><ul><li>Create a wide gently sloping beach. </li></ul>

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