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Large Scale Depositional Features

Large Scale Depositional Features. Sand Spits Bay mouth bars Barrier Islands Sea Islands Tombolos Lagoons Inlets Deltas. Barrier Island Migration. Barrier Island: Formed from sediment Accumulating on submerged rises parallel To shoreline. Also formed from drowned former coastlines

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Large Scale Depositional Features

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  1. Large Scale Depositional Features • Sand Spits • Bay mouth bars • Barrier Islands • Sea Islands • Tombolos • Lagoons • Inlets • Deltas

  2. Barrier Island Migration Barrier Island: Formed from sediment Accumulating on submerged rises parallel To shoreline. Also formed from drowned former coastlines And are remnants of old dunes. Migration: When sea level rises, sand is eroded On ocean-side and deposited on lagoon side. This causes barrier islands to move landward. When sea level falls, sand can be deposited Seaward and migration stalls or the island can Move seaward. Right now, sea level is rising.

  3. Coasts formed by Biological Activity Coral Reefs (Atolls, fringing reefs, barrier reefs) Mangroves

  4. Atolls and Reefs

  5. Mangroves Trees that grow in Salt water. Mostly in tropical areas like Florida, Central America, And parts of Australia.

  6. Estuaries A body of water partially surrounded by land where fresh water from rivers mixes with salt water. Brackish water: mixture of salt and fresh water (8-25 PPT on average). Chesapeake Bay is an estuary. We will learn more about Estuaries when we look at marine communities.

  7. Human Interference Breakwaters: Wall build parallel to shoreline to build up beach behind it. Groins/Jetties: Rock walls or other material placed at right angles to the shoreline to build up beach by stopping longshore transport. Seawalls: Built parallel to shoreline to protect property from wave erosion. Importing Sand: Dredged from the seabed, the sand is then deposited on the eroding beach.

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