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Fluvial Systems Alluvial Fan, Meandering River, Braided River

Fluvial Systems Alluvial Fan, Meandering River, Braided River. Amy Asanuma Zack St.Clair. Alluvial Fan. Poorly Sorted Sediments with abundant gravel sized detritus Boulders – Sands Cone Shaped with network of branching distributary channels that cross the fan.

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Fluvial Systems Alluvial Fan, Meandering River, Braided River

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  1. Fluvial SystemsAlluvial Fan, Meandering River, Braided River Amy Asanuma Zack St.Clair

  2. Alluvial Fan • Poorly Sorted Sediments with abundant gravel sized detritus • Boulders – Sands • Cone Shaped with network of branching distributary channels that cross the fan Wrangell-St. Elias National Park, Alaska

  3. Sedimentary Processes • Debris-flow Deposits • Mud Flows • Landslides • Sheet flood • Incised-channel flow

  4. Sedimentary Structures • Cross beds • Steep gradient ~5-10 degrees • Building on top of itself • Coarsen Upwards

  5. Braided River • Poor sorting – better than alluvial fans • Gravels – Sands • Steep Channel Gradient Resurrection River, Kenai Peninsula, Alaska

  6. Sedimentary Structures • Trough/Tabular Cross beds • Laminations • Sedimentary Load > Water • Fining Upwards and Repeats • Erodible Banks

  7. Meandering River • Sediment Load < Water • Gravels – Muds • Moderate Sorting Owens River, CA

  8. Sedimentary Structures • Shallow Gradient • Fining Upwards • Ripples • Cross Beds • Bioturbidation Oblique Dunes in a Meandering River System, Muddy Creek, Wyoming

  9. Fossils

  10. Stratigraphic Section

  11. Fluvial System Example in History • Alluvial Fan-Important in Precambrian and early Paleozoic time before land plants could provide vegetation cover to inhibit erosion

  12. Present Day Fluvial System • Alluvial Fan-common in areas of high relief, at the base of a mountain range, abundant supply of sediment needed

  13. Present Day Braided River • Extensive braided river systems are found in Alaska, Canada, New Zealand's South Island, and the Himalayas, which all contain young, rapidly eroding mountains

  14. Works Cited • Boggs Jr, Sam. Princiles of Sedimentology and Stratigraphy. Fifth Edition. New Jersey: Pearson Prentice Hall, 2011. 211-220. Print.

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