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Sediment Deposition and River Structures

Sediment Deposition and River Structures. Deposition of Large Materials. Once rivers reach lower gradients, their erosional power decreases and their ability to carry sediment downstream also decreases. With low flows, rivers deposit larger material, forming cobble banks and gravel bars.

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Sediment Deposition and River Structures

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  1. Sediment Deposition and River Structures FREEING THE ELWHA

  2. Deposition of Large Materials Once rivers reach lower gradients, their erosional power decreases and their ability to carry sediment downstream also decreases. With low flows, rivers deposit larger material, forming cobble banks and gravel bars. FREEING THE ELWHA

  3. Deposition or pebbles and sand As the gradient decreases further, the sediment that is deposited gets smaller. The banks and deeper pools often have layers of sand. FREEING THE ELWHA

  4. Rivers in Flat Areas Meander Once gradients are flattened, only sand and silt can be transported and the river begins to meander. FREEING THE ELWHA

  5. The Flood Plain When Dry The floodplain is the area available to be occupied by the river as it meanders. It can also be filled completely during floods. FREEING THE ELWHA

  6. The Floodplain FREEING THE ELWHA

  7. Effects of Meandering Rivers FREEING THE ELWHA

  8. Levees Floodplain Levee Levee When sediment accumulates on the side of a river, it can form a barrier that keeps the river within its channel. They tend to build up during flood events. FREEING THE ELWHA

  9. Braided Stream FREEING THE ELWHA

  10. Oxbow Lakes FREEING THE ELWHA

  11. This project was made possible in part by a grant from Washington’s National Park Fund. FREEING THE ELWHA

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