Formation of spits, tombolos and bars

1. Formation of Spits, Tombolos and Bars By: Syazwani Ismail

2. Spit is a long narrow ridges of sand and shingle which is projected into the sea from coastline What is spit? http://worldlywise.pbworks.com/w/page/15409212/Unit%201%20Section%20A%20-%20How%20physical%20processes%20have%20created%20coastal%20landforms

3. Longshore drift transports material along the coastline Spits formed in shallow and sheltered water when there is a change in the direction of the coastline Deposition occurs resulting in the accumulation of sand and shingle The material initially deposited is the largest material, dropped due to the reduction in energy Spit formation

4. Finer material is then deposited, helping to build up the rest of the spit As spit grow outwards, a change in wind direction may result in a change in the direction of the spit forming a curved end ( recurved laterals) If growing across a river estuary, the length of the spit will be restricted A salt marsh may form in the sheltered, low energy zone behind the spit.

5. http://geobytesgcse.blogspot.com/2007/08/coastal-deposition-landforms-features.html

6. a ridge of sand and shingle joining the mainland to an island What is Tombolos ? http://80.59.24.98/Joomla/index.php/geog-historia/prof-d-marcelino-urresti/88-tema-1o-relieve-costero

7. Tombolo's are created through the process of longshore drift A tombolo is formed where the spit continues to grow until it reaches an island, forming a link with the mainland, just like bridges Tombolos formation

8. http://geobytesgcse.blogspot.com/2007/08/coastal-deposition-landforms-features.html

9. a ridge of sand and shingle which has joined two headlands, cutting off a bay What is Bar? http://www.3plains.com/uploads/image/wallpapers/ocean-wallpaper-2.jpg

10. ( a) a spit grows the whole way across a bay (b ) a sandbank devlops offshore, parallel to the shore, and is moved towards the coastline by the waves and wind until it joins the mainland  Behind the bar, a lagoon is created, where water has been trapped and the lagoon may gradually be infilled as a salt marsh Over time the lagoon will become infilled by deposition Bar formation

11. http://geobytesgcse.blogspot.com/2007/08/coastal-deposition-landforms-features.html

12. Features Spits Tombolos Bars What is it? a ridge of sand and shingle projecting from the mainland into the sea a ridge of sand and shingle joining the mainland to an island a ridge of sand and shingle which has joined two headlands, cutting off a bay How does it form? when there is a break in the coastline and drop in energy, long-shore drift deposited the material and build up spit formed when spit continue to grow outwards connecting the mainland to the offshore island just like bridges ( a)form when a spit grows the whole way across a bay (b) a sandbank develops offshore, parallel to the shore until it joins the mainland  Example Hurst Castle Spit Isle of Portland Slapton Sands   S ummary