Large scale depositional features
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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
Large Scale Depositional Features

  • Sand Spits

  • Bay mouth bars

  • Barrier Islands

  • Sea Islands

  • Tombolos

  • Lagoons

  • Inlets

  • Deltas


Barrier island migration
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.


Coasts formed by biological activity
Coasts formed by Biological Activity

Coral Reefs (Atolls, fringing reefs, barrier reefs)

Mangroves



Mangroves
Mangroves

Trees that grow in

Salt water.

Mostly in tropical areas like

Florida, Central America,

And parts of Australia.


Estuaries
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.


Human interference
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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