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Analyse the data shown in Figure 5 - AQA - A-Level Geography - Question 3 - 2018 - Paper 1
Question 3
Analyse the data shown in Figure 5. Figure 5, on the insert, is an image of the coast in the vicinity of Chabahar Bay, Iran. The image focuses on the movement of se... show full transcript
Worked Solution & Example Answer:Analyse the data shown in Figure 5 - AQA - A-Level Geography - Question 3 - 2018 - Paper 1
Step 1
Understand the Influence of Longshore Drift
Answer
The coastline is influenced by longshore drift, which transports sediment primarily from east to west. Given that the dominant wave direction is from the north-north-west, this indicates that sediment is being moved along the shore due to this current.
Step 2
Analyze Sediment Movement and Areas
Answer
The sediment cell extends approximately 50–60 km along the coast. In areas where the current is more vigorous, sediment deposition is noted, particularly in regions designated as deposition areas, while others are marked as erosion zones. This clearly demonstrates the dynamic nature of sediment transfer.
Step 3
Observe Coastal Protection and Erosion
Answer
There are no coastal protection measures in place, resulting in significant erosion along the eastern side of the coast, particularly around the 70 m depth contour. This lack of protection leads to the suggestion that material being washed away significantly impacts shoreline stability.
Step 4
Assess River Sediment Contribution
Answer
It is evident that sediment is also supplied by rivers in the area, which influences both deposition and erosion processes. As rivers contribute material, they enhance sediment availability along the coast, affecting the overall dynamics of the region.
Step 5
Conclusion on Sediment Dynamics
Answer
The sediment dynamics in Chabahar Bay suggest that while there are zones of deposition, there are also significant losses of material, particularly due to the influence of longshore drift. Thus, understanding this sediment transport is crucial for managing coastal erosion and sedimentary processes.