Fluvioglacial Processes And Landforms


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Fluvioglacial Processes And Landforms

  1. 1. Fluvioglacial Processes and Landforms<br />
  2. 2. Meltwater streams<br />Warm based glaciers produce the most meltwater<br />Tunnel<br />Snout<br />Meltwater channel <br />
  3. 3. Fluvioglacial deposits come from glacial meltwater<br />Features formed by glacial deposition are different from those from fluvioglacial deposits.<br />Retreating glacier<br />Braided channels<br />Terminal moraine<br />Tunnel<br />
  4. 4. Fluvioglacial deposits come from glacial meltwater<br />Glacial deposits are unsorted whilst fluvioglacial deposits are sorted<br />Retreating glacier<br />Braided channels<br />Terminal moraine<br />Tunnel<br />
  5. 5. Features of fluvioglacial deposition<br />Terminal moraine<br />Kettle holes<br />Kame terrace<br />Kame<br />Esker<br />
  6. 6. Sorting effect of fluvioglacial deposition<br />Because of the effect that water has is similar to that of rivers the heaviest deposits are deposited first followed by the smaller and finer sand and finally clay.<br />Outwash plain<br />Gravel Sand Clay <br />
  7. 7. Kettle Holes<br />Blocks of ice that have broken off the glacier get surrounded and buried by glacial deposits<br />When the ice melts they leave holes in the outwash plain called kettle holes.<br />
  8. 8. Eskers<br />Eskers are long winding ridges of sand and gravel that run in the same direction as the glacier. <br />They’re deposited by meltwater streams flowing in tunnels under the ice.<br /> When the glacier retreats the stream dries up and the load remains as an esker.<br />
  9. 9. Kames<br />Kames are mounds of sand and gravel found on the valley floor.<br />Meltwater streams on top of glaciers collect in ice depressions and deposit layers of sediment.<br />When the ice melts the debris is deposited on the floor.<br />
  10. 10. Kame Terraces<br />Kame terraces are piles of deposits left agains the valley wall by meltwater streams that run between glaciers and the valley sides.<br />The look like lateral moraine but they are sorted into layers<br />Meltwater streams deposit the heaviest layers first, so they have gravel at the bottom and clay at the top.<br />
  11. 11. Proglacial lakes<br />Proglacial lakes can form in front of glaciers <br />Tunnel<br />Meltwater streams<br />Terminal moraine<br />Proglacial lake<br />Glacier<br />
  12. 12. How Proglacial lakes can form<br />Proglacial lakes can form in front of glaciers<br />This is usually when water from meltwater streams gets dammed by terminal moraine<br />As the meltwater flows into the proglacial lake they slow down and deposit their load on the ice<br />These deposits are dumped on the valley floor when the glacier retreats and the lake disappears and form delta kames <br />