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Three Features of a River

Three Features of a River. By Wilby , Gazza And The Cravenator . Next. Three Features of a River. Meanders – By Luke Wilby Ox-Bow Lakes – By Gareth Cotton Waterfalls – By Robert Craven. Back. Meanders. Back. Next. What is a Meander?.

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Three Features of a River

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  1. Three Features of a River By Wilby, Gazza And The Cravenator Next

  2. Three Features of a River • Meanders – By Luke Wilby • Ox-Bow Lakes – By Gareth Cotton • Waterfalls – By Robert Craven Back

  3. Meanders Back Next

  4. What is a Meander? • A meander is a well developed bend in a river. They are formed by the river eroding the outside of the bend and depositing sediment on the inside. As time goes on the bend becomes more and more defined. Next Back

  5. How Meanders are Formed • http://www.cleo.net.uk/resources/displayframe.php?src=309/consultants_resources%2F_files%2Fmeander4.swf • Step-By-Step Next Back

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  14. Oxbow Lakes An ox-bow lake is a type of lake which is formed when a wide meander from a stream or a river is cut off to form a lake. They are called oxbow lakes due to the distinctive curved shape that results from this process. Back Next Slide >

  15. Complete Animation (external link) • Step-By-Step Analysis Next Slide >

  16. When a river reaches the floodplains, which are common in the lower course of a river, the channel begins to meander widely. This results in deposition occurring on the convex bank (river beach) due to the low velocity of the water at this point. In contrast, lateral erosion and undercutting occurs on the concave bank (river cliff) where the river water is traveling at high speed. Next Slide >

  17. Continued erosion and deposition occurring at meander < Previous Slide Next Slide >

  18. Continuous erosion on the concave bank (river cliff) and continued deposition of the convex bank (river beach) of a meandering river, causes the formation of a pronounced meander with two concave banks getting closer. < Previous Slide Next Slide >

  19. The narrow neck of land between the two neighbouring concave banks is finally cut through, either by lateral erosion of the two concave banks or by the strong currents of a flood. < Previous Slide Next Slide >

  20. Following the collapse of the river cliffs, thus adjoining the two previous segregated parts of the river, a new straighter river channel is created and an abandoned meander loop, called a cut-off, is formed. Deposition continues until an ox-bow loop is formed which is disconnected from the main channel. < Previous Slide Next Slide >

  21. Usually deposition, plant matter and the gradual collapse of the banks will fill up the ox-bow which may only be seen in times of flooding. < Previous Slide Next Slide >

  22. Quiz • What is the feature called, which is the concave bank, where the water flows at the highest velocity? River Beach River Cliff Cut-Off Meander

  23. Our Survey Says… < Try Again

  24. Correct Next Question >>

  25. Our Survey Says… < Try Again

  26. Our Survey Says… < Try Again

  27. Quiz 2. When an oxbow lake is formed, is the main channel more curved or more straighter than what it was before the ox-bow lake’s formation? Straighter Curved

  28. Correct Next Question >>

  29. Our Survey Says… < Try Again

  30. Quiz 3. In what course do ox-bow lakes occur? Upper Middle Lower

  31. Our Survey Says… < Try Again

  32. Our Survey Says… < Try Again

  33. Correct Next >>

  34. The End • This quiz was designed with people of average intelligence in mind. Back To Category Menu >>

  35. Waterfalls By Robert Craven Next Back

  36. What are waterfalls? A waterfall is a steep descent of the water of a river. Famous waterfalls include Angel Falls (right) and Victoria Falls (above). Next

  37. How are waterfalls formed? • Click on the picture Next

  38. It’s quiz time!!! • Your first question: Which of the following is a famous waterfall: • Elizabeth Falls answer • Victoria Falls answer • Henry Falls answer • Water Falls answer

  39. Incredibly and extremely… CORRECT!!! Next question

  40. Incredibly and extremely… WRONG!!!

  41. Ok clever clogs, question 2 • What does a waterfall create as it continues to wear away softer rock: • Rapids answer • Another waterfall answer • A plunge pool answer • An oxbow lake answer

  42. Incredibly and extremely… CORRECT!!! Next question

  43. Incredibly and extremely… WRONG!!!

  44. You made it this far, time for the final question… • What is left when a waterfall retreats up a stream: • A lake answer • A gorge answer • An oxbow lake answer • A big gaping hole answer

  45. Incredibly and extremely… CORRECT!!! Well done! Back to the menu for you

  46. Incredibly and extremely… WRONG!!!

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