Coastal transport and deposition
Lesson Summary: Coastal Transport and Deposition
This lesson focuses on how material moves along the coastline and how it is eventually deposited to form coastal features. It builds on prior knowledge of coastal processes such as erosion, transportation, and deposition, and emphasises how these processes work together as part of a coastal system.
Students begin with a starter activity to review key terminology (e.g. erosion, attrition, hydraulic action) and consider factors that influence erosion rates, such as rock type, wave energy, and human activity.
The main part of the lesson introduces coastal transportation, explaining how sediment is moved by waves, tides, and currents. Students learn the four types of transportation:
Traction
Saltation
Suspension
Solution
A key focus is longshore drift, including:
How waves approach the beach at an angle
The role of swash and backwash
How sediment is moved along the coast
The impact of longshore drift on beach formation and the use of groynes
Students complete diagram-based tasks to reinforce understanding of these processes.
The lesson then explores deposition, explaining:
When and why material is deposited (low-energy environments)
How beaches form when swash is stronger than backwash
Landforms created by deposition, such as sand dunes, spits, and salt marshes
Finally, students apply their knowledge through field sketching and written tasks, including identifying the direction of longshore drift and summarising how deposition occurs.


