Geography – 4. Geographical skills and investigations | e-Consult

(a) Evidence of Coastal Erosion: The photograph clearly shows several features indicative of coastal erosion. These include:

• Cliffs: Steep, vertical rock faces formed by the undercutting action of waves.
• Retreating Coastline: The land has visibly moved back, indicating the sea is actively eroding the land.
• Pebble Beach: A beach composed of rounded pebbles, formed by the abrasion of rocks within the waves.

(b) Abrasion and Coastal Erosion: Abrasion is a process where waves carry sediment (sand, pebbles, shingle) and use this sediment as an abrasive tool to wear away the coastline. The sediment is hurled against the cliffs and rocks, gradually grinding them down. This process is particularly effective in areas with strong wave action and high sediment availability. Abrasion contributes to erosion by physically removing material from the coastline, leading to the formation of cliffs, caves, arches, and stacks.

(c) Coastal Protection Method: One method coastal communities might use to protect themselves from coastal erosion is the construction of a sea wall. A sea wall is a solid structure built parallel to the coastline to protect the land from wave attack. Sea walls are effective at preventing direct wave impact but can reflect wave energy back onto the beach, potentially exacerbating erosion in adjacent areas. Other methods include beach nourishment, groynes, and managed retreat.