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SPITS, BARS AND TOMBOLOS
Spits, Bars and Tombolos
by Millie and Liv
Spits
1. Longshore drift moves material along the coastline.
2. A spit forms when the material is deposited.
3. Over time, the spit grows and develops a hook if wind direction changes further out.
4. Waves cannot get past a spit, which creates a sheltered area where silt is deposited and mud flats or salt marshes form.
HOw are they formed
HOw are they formed
- Spits can be created by deposition, it is a extended stretch of beach which can lead into the sea, and it is then joined to the mainland at one end.
- They can be formed where the preavailing wind blows at an angle to the coast line which ends up as longshore drift.
- For example SPURN HEAD is on the Holderness coast
- spits gradually happen over time, and people build on them as there extended land as you can see in the picture.
Facts
Facts
- Spits form over years
- They form a sharp bend
- Strong winds can curve the end of the spit
- You can build buildings on them
- Longshore drif transports sand and shingle
- The sheltered are behind the spit is protected from waves
Examples
Examples
Examples
Examples
Dungeness Spit, Washington.
Spurn Head Spit
Bars
Bars
Longshore drift is the cause of a spit forming at the mouth of a river. Where a spit grows across a bay, a bar is formed. Where water flows in behind this, a lagoon is formed.
Examples of bars
This is Cies Islands, Spain
This is Humboldt Bay
TOMBOLOS
A Tombolo is a spit connecting an island to the mainland.
TOMBOLOS
How are the formed
How are they formed
How are they formed
Tombolos are formed by wave refraction and diffraction. As waves near an island, they are slowed by the shallow water surrounding it. ... Eventually, when enough sediment has built up, the beach shoreline, known as a spit, will connect with an island and form a tombolo.
Examples
Examples
Examples
Examples
Chesil Beach, which connects the Isle of Portland to the mainland of the Dorset coast.
Near Hong Kong