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 a... 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
State TWO conditions that promote dune formation.
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Answer
Abundance of sediment: A sufficient supply of sand is crucial for forming dunes.
Onshore wind: Winds blowing towards the shore help transport sand from the beach to dune areas.
Step 2
Describe TWO types of natural wind-blown sand movement that can be experienced.
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Surface creep: This occurs when sand grains move along the surface, rolling or sliding due to the force of the wind.
Saltation: A process where smaller sand particles are lifted from the ground into the air for short distances, before they fall back down due to gravity.
Step 3
Why is it considered necessary to stabilise the wind-blown sediment?
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Stabilising wind-blown sediment is necessary to:
Prevent soil erosion and loss of sand which can lead to infrastructure damage.
Establish a healthy ecosystem that supports vegetation, which further protects the dunes.
Improve the effectiveness of dunes in trapping sand and preventing it from being blown onto roads.
Ensure that the newly reformed dunes maintain their structure and support local wildlife.
Step 4
What engineering approach is being applied in the article?
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The approach being applied is soft engineering, specifically through the use of sand stabilisation techniques, such as wind nets and vegetation.
Step 5
Provide evidence from the text to support your answer.
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The text mentions that sand will be stabilised with wind nets and that dune-specific plants will be used to reinforce the dune structure, illustrating the soft engineering approach.
Step 6
Is the proposal by the deputy mayor good or poor? Explain your answer.
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The proposal by the deputy mayor can be considered good because it aims to restore and protect the dune system which is crucial for coastal protection. It includes measures to prevent erosion and maintain the health of the ecosystem, which will ultimately support the local community and wildlife.
