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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Barrier Island: Formed from sediment
Accumulating on submerged rises parallel
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
Right now, sea level is rising.
Coral Reefs (Atolls, fringing reefs, barrier reefs)
Trees that grow in
Mostly in tropical areas like
Florida, Central America,
And parts of Australia.
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.
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.