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Rivers

Rivers . 11.1 – 11.2. Zones in rivers. From Miller’s Living in the Environment. Youthful rivers. http:// levyc.victorschools.org/Science%20Materials/Unit%204%20Web%20Files/Three_Stages_of_River_Development-geoteach.pdf Narrow V shaped Velocity is fast Current is strong Steep sides

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Rivers

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  1. Rivers 11.1 – 11.2

  2. Zones in rivers From Miller’s Living in the Environment

  3. Youthful rivers • http://levyc.victorschools.org/Science%20Materials/Unit%204%20Web%20Files/Three_Stages_of_River_Development-geoteach.pdf • Narrow • V shaped • Velocity is fast • Current is strong • Steep sides • No floodplain • Erosion occurs at bottom • Moves boulders – sand – fine sediments

  4. Young rivers • NC mountain river http://ykonline.yksd.com/distanceedcourses/Courses/EarthScience/lessons/FourthQuarter/Chapter12/12-2.html http://www.nc-flyfishing.com/wnc-trout-streams

  5. Mature rivers • http://levyc.victorschools.org/Science%20Materials/Unit%204%20Web%20Files/Three_Stages_of_River_Development-geoteach.pdf • U shaped • Narrow floodplain • Medium velocity • Moves medium – small sediments • Erosion occurs at edges

  6. Mature rivers flyfishingspirit.com http://www.localyte.com/attraction/58618--Bheri-RiverFishing-Trip--Nepal--Gandaki--Pokhra

  7. Old age rivers • http://levyc.victorschools.org/Science%20Materials/Unit%204%20Web%20Files/Three_Stages_of_River_Development-geoteach.pdf • Broad U shape • Wide floodplain • Slow moving • Moves fine sediments • Erosion occurs at edges

  8. Old age rivers • Yukon River, Alaska ak.water.usgs.gov

  9. Deposition • The rocks, soil and sediments that are eroded by the steam or river are deposited downstream. • In water • On land

  10. Deposition in water • Delta • Formed when a river empties into a lake or the ocean. • Fan-shaped deposit • Mississippi delta • Gulfsci.usgs.gov

  11. Deposition in water • Placer deposits • Heavy minerals deposited in stream or river • Gold deposits • http://nevada-outback-gems.com/basic_prospecting/dredge_tony.jpg

  12. Deposition on land • Floodplains • Areas along a river that receives sediment when river overflows its banks http://www.google.com/imgres?imgurl=http://www.kidsgeo.com/images/flood-plain.jpg&imgrefurl=http://www.kidsgeo.com/geology-for-kids/0080-floodplains.php&usg=__Tr-Kn3FKtUfHboeCHkBYNZ_Fhsg=&h=334&w=400&sz=40&hl=en&start=1&zoom=1&tbnid=_dQJsiBEMjfnFM:&tbnh=104&tbnw=124&ei=BiwbTuzdHYnegQes4ews&prev=/search%3Fq%3Dfloodplain%2Bimages%26um%3D1%26hl%3Den%26biw%3D1138%26bih%3D535%26tbm%3Disch&um=1&itbs=1&biw=1138&bih=535

  13. Deposition on land • Alluvial fans • Fan shaped deposits form on dry land

  14. Homework • Read pages 308 - 319

  15. Output • Write out & illustrate the following vocab words: • Gradient • Discharge • Load • Bed load • Flood plain • Suspended load • Deposition • Delta • Alluvial fan

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