Coastal Landforms.

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Presentation transcript:

Coastal Landforms

Landforms created by erosion

Landforms of erosion

Wave-cut platform

Cliffs and wave-cut platform

Caves, arches, stacks and stumps

Caves, arches, stacks and stamps

When caves are formed on both sides of a headland, their back join and an arch is formed.

The sea continues to erode the bottom of the arch The sea continues to erode the bottom of the arch. Weathering also take place on the bare rock faces. As the sea undercuts the bottom of the arch, a wave-cut notch will form.

The arch will collapse, in time, as it is pulled down by the pressure of its own weight and gravity. This leaves behind a column of rock not attached to the headland, called a stack.

Continued wave erosion and weathering will lead to the formation of a stump that is only visible at low tide.

Homework Draw annotated diagrams to explain the formation of landforms of erosion Title before each diagram (in dark pencil) Annotations around the diagrams. Not below!

Movement of sediment along the coast

Longshore drift

Impacts of longshore drift

What is an estuary?

What is dredging? to remove material from the bottom of the sea or a river.

Landforms of deposition (constructive waves)

Beaches

Sandy beach

Durdle Door : a shingle beach separated by the famous “door” Dorset UK

Seaside resorts often build groynes to keep beaches in place and to reduce the effects of longshore drift

On the land side, silt and alluvium are deposited and salt marshes form.

Bars

Slapton Ley Bar in Devon

Example in Cyprus: Larnaca Salt lake is a lagoon with the bar on the East