Large Scale Depositional Features
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Transcript of Large Scale Depositional Features
Large Scale Depositional Features
Sand Spits Bay mouth bars Barrier Islands Sea Islands Tombolos Lagoons Inlets Deltas
Barrier Island MigrationBarrier Island: Formed from sedimentAccumulating on submerged rises parallelTo shoreline.
Also formed from drowned former coastlinesAnd are remnants of old dunes.
Migration: When sea level rises, sand is erodedOn 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 canMove seaward.
Right now, sea level is rising.
Coral Reefs (Atolls, fringing reefs, barrier reefs)
Mangroves
Coasts formed by Biological Activity
Atolls and Reefs
Mangroves
Trees that grow in Salt water.
Mostly in tropical areas likeFlorida, 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.
Estuaries
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.
Human Interference