05. Erosional Coastal Landforms

Watch this video on a collapsed cliff.

· Where is this place in the video?

· What is happening in the video?

· Who are affected by the incident in the video?

· What are the impacts?

· What are the possible solutions to the incident?

Watch the cliff collapse in the video as well as note the erosional features such as headland, cliff, sea arch, stack and stump (esp from 0.20).

How does erosion of coastal areas with rocks of different resistance result in an indented coast with the headland and bay?

What are the 4 erosional processes?

http://www.coolgeography.co.uk/GCSE/AQA/Coastal%20Zone/Landforms/Erosion%20Landforms.htm

How is a wave-cut platform and cliff formed?

· The cliff is produced by the action of waves undercutting the less resistant rock.

· Hydraulic action and abrasion may erode a crack on the rock surface

· Eventually, the crack may be enlarged to produce a notch which may be further deepened inwards to produce a sea cave.

· Further undercutting by the waves will eventually cause the roof of the sea cave to collapse.

· The more resistant rock will form the overhanging cliff which will eventually collapse.

· As the erosional process continues, the cliff may retreat further inland and over time, a gently-sloping shore platform is formed at the base of the cliff.

Video which I took at Qijing island near Kaohsiung, Taiwan, in 2016.

Look at how strong the waves are. Recall how it leads to the formation of the cliff and stumps.

Photo taken by Yuri, one of my former students, of the 12 Apostle in Australia.

Photo taken by Wilson Tan of the 12 Apostle in Australia in 2019.

Due to continuous wave erosion and weathering, some of the stacks are reduced to stumps. Can you identify the cliff, stacks and stumps? The position of the coast affect wave energy. Why is wave energy high at the headland?

Photo taken by my colleague, Ayla, in Greece. Look at how the headland protrudes out into the sea. Coastal erosion caused both sides of the headland to be eroded forming a sea arch. Will the top of the sea arch collapse due to erosion and weathering?

This sea arch looks like a heart from the side and is known as the heart of Santorini.

360 view of an sea arch

https://kuula.co/share/7YfxH?fs=1&vr=1&iosfs=1&zoom=1&thumbs=1&chromeless=1&logo=1&logosize=120

Tanjong Rimau in Sentosa