Read the text below and answer the questions that follow - NSC Marine Sciences - Question 3 - 2023 - Paper 1
Question 3
Read the text below and answer the questions that follow.
DUNE REHABILITATION AT TABLE VIEW BEACH TO START IN JULY
The city plans to rehabilitate the dune system al... show full transcript
Worked Solution & Example Answer:Read the text below and answer the questions that follow - NSC Marine Sciences - Question 3 - 2023 - Paper 1
Step 1
TWO conditions that promote dune formation.
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Answer
Abundance of sediment: A significant amount of sediment is crucial for dune formation, providing the necessary material for dunes to build up.
Onshore wind: Winds that blow from the ocean towards the shore are essential, as they drive the sand inland and help form dunes.
Step 2
According to the article, emphasis is placed on stabilising the sand.
(a) Describe TWO types of natural wind-blown sand movement that can be experienced.
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Surface creep: This describes the movement of sand along the ground when particles are pushed by wind at lower velocities.
Saltation: This is the process where sand particles are lifted into the air for short distances before being brought back down by gravity.
Step 3
Why is it considered necessary to stabilise the wind-blown sediment?
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Stabilising the wind-blown sediment is essential to protect the beach and adjacent infrastructure from erosion and to enhance the natural formation of the dunes.
If the sand is left unstable, it could lead to further degradation, which would negatively impact both the ecosystem and human activities along the shore.
Step 4
What engineering approach is being applied in the article?
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The article discusses the application of soft engineering approaches, particularly through the reinstatement of the dune profile using bulldozing equipment.
Step 5
Provide evidence from the text to support your answer.
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The text states, 'A combination of heavy machinery, bulldozers, excavators and dump trucks will be used to reinstate and profile the dunes,' indicating the soft engineering approach taken.
Step 6
Is the proposal by the deputy mayor good or poor?
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The proposal can be considered good. It aims to restore the dune system, which plays an essential role in protecting the coastal infrastructure from erosion and flooding.
