Lulworth Cove
Location & Background
Physical factors & Processes
Coastal Landforms
How and why landscapes change over time
World heritage sight
Stages of erosion on a concordant coastline
processes have been operating over the past 8000 years
joints and cracks in the rock
weaker Purbeck bed erodes faster than Portland limestone
wave refraction allows lateral erosion
attrition operates on sediment on beach making it smaller, smoother and rounder
sub aerial processes operating on the coastline include saltation, crystallisation and wetting & drying
Lulworth cove expands as he softer rock which the cove is made out of gets eroded away
biological and freeze thaw weathering are the dominant processes acting on the landscape
pounding, sub aerial, hydraulic action all occur at the cliffs base
the durdle door arch will probably at some point collapse as the rock weakens through weathering to then turn the edge of it into a stack then eventually after erosion a stump
Stair hole
Durdle Door
Lulworth cove
St Oswalds bay
Embryo cove: seas first breach of Portland limestone, thinner bedding in the Purbeck limestone so more weaknesses for the processes to attack
Processes: hydraulic action, attrition,abrasion,corrosion
processes utilise weaknesses in the rocks
Located in Dorset on the south coast
Evidence of erosion
Wealden slumping of clay
Chalk pebbles on the beach
purbeck blocks can be seen broken on the beach
What occurs when two coves join up
Sea trying to starighten coast again
Portland limestone blocks in water sign of erosion
Bay has been straightened
erosion of chalk leaves stack and stump
Caves due to faulting
Dry valleys
Wave energy gets dissipated on shingle beaches