Specification Detail1.1d How are beaches, spits and barsformed?
Learning Objectives● Explain the impact on the coastline in terms of landforms and related issues, e.g. deposition in estuaries.● Describe the named landforms and explain their formation in terms of sequence and the processes involved.
BBC Bitesize Video● Deposition Landforms : Here
Hurst Castle – Satellite Shot. Can you explain what is happening here?
Landforms of deposition - Spits estuary headland direction of longshore drift 1) Larger shingle is deposited at a change of direction in the coastline due to less energy in the lee of a headland. 2) Sediment rises above water level. Larger material is thrown to the back in times of storm increasing the stability of the feature. 3) Smaller sand and shingle is moved along the new feature by longshore drift. The landform extends outwards but is vulnerable to wave attack. 4) Secondary wave action or refraction cause a hooked end. A series of these develop as the spit extends. 5) The spit is prevented from extending further by the river flash animation current preventing further deposition (in a bay it may continue forming a bar). A final curved end is formed but the spit Click Here constantly changes shape through erosion and deposition.