Coastal Erosion and
Deposition
• Coastal
Erosion: Coastal erosion is the
wearing away of land and the removal of beach
or dune sediments by wave action, tidal currents,
wave currents, drainage or high winds
Coastal Deposition: Coastal deposition is the
laying down of material on the coast by the sea. It
occurs when waves lose energy or when large
inputs of sediment are made into the coastal
system
One Year of Coastal Erosion/Cliff
Collapse
•
https://www.youtube.com/watch?v=ChEHQUMEkXw&playnext=1&list=PLE
5A4DFAFD2FCBC5E
•
https://www.youtube.com/watch?v=ITv6gSUmTjc
Erosional and depositional landforms of coastal areas
are the result of the action of ocean waves.
Erosional Landforms
Sea Cliffs
Wave-cut Notches
Caves
Sea stacks
Sea arches
Depositional landforms
Beaches
Barrier Spit
Baymouth Bar
Lagoon
Tombolo
Cliff
A tall, steep
rock face,
formed by
the
undercutting
action of the
sea.
Wave Cut
Notch
A rock recess
at the foot of a
sea cliff where
the energy
of waves is
concentrated
Cave
Caves form in
more erosive
sediment when
the rock does
not
fully collapse in
a deeplynotched
environment
Arch
A sea arch is a
natural opening
eroded out of a
cliff face by
marine
processes.
Stack
a pillar like
mass of rock
detached by
wave action
from a cliff-lined
shore and
surrounded by
water.
Depositional Landforms
• Littoral
Drift: the drifting of
sediments, especially marine
sediments, in patterns parallel to the
contours of a beach, due to the action
of waves and currents.
Barrier Spit
•A
barrier of sand created by
littoral drift joined at one of its
ends to the mainland.
Baymouth Bar
• If
the spit grows to completely block
an embayment, it is called a bay
barrier or baymouth bar.
Lagoon
•A
lagoon is a body of water behind
the barrier.
A tombolo occurs when sediment deposits connect the
shoreline with an offshore sea stack or island