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Using Figure 2a, Figure 2b and your own knowledge, assess the potential impact of changing vegetation cover upon the runoff in this area - AQA - A-Level Geography - Question 1 - 2019 - Paper 1
Question 1
Using Figure 2a, Figure 2b and your own knowledge, assess the potential impact of changing vegetation cover upon the runoff in this area. Figures 2a and 2b are in t... show full transcript
Worked Solution & Example Answer:Using Figure 2a, Figure 2b and your own knowledge, assess the potential impact of changing vegetation cover upon the runoff in this area - AQA - A-Level Geography - Question 1 - 2019 - Paper 1
Step 1
Changes in the Water Cycle
Answer
Vegetation cover plays a crucial role in the water cycle by influencing factors such as infiltration, evapotranspiration, and runoff. The maps in Figure 2a demonstrate the transformation of vegetation in the Taguibo Watershed from 1976 to 2001, revealing shifts from forest and grassland to bare soil and built-up areas. This likely leads to increased surface runoff due to less vegetation to absorb rainfall and slower infiltration rates.
Step 2
Impact on Runoff Volume
Answer
Figure 2b highlights varying runoff volumes for different years and vegetation states. The data suggests that without sufficient vegetation, runoff volumes can be significantly higher, as seen in the 2007 storm scenario. The potential for excessive runoff can lead to soil erosion and sedimentation in nearby water bodies, exacerbating the area's ecological instability.
Step 3
Potential Rehabilitation Effects
Answer
The maps also show areas designated for rehabilitation. Reintroducing natural vegetation can potentially mitigate the effects of increased runoff by restoring natural absorption and slowing the water flow. Such efforts would likely lead to improvements in water quality and ecosystem health over time, demonstrating the importance of sustainable land management practices.