river exe Flashcards
Where is the source and mouth of the river exe?
Source: Exmoore ( 524m above sea level)
Mouth: Exmouth
How long is the river Exe?
82km long
What type of geology dominates the river Exe basin?
impermeable sandstone, which leads to high surface runoff
How does the impermeable bedrock of the River Exe affect its water cycle?
The impermeable bedrock reduces percolation, increasing surface runoff and contributing to a flashy river regime.
What is the average annual rainfall in the river exe basin?
around 1300mm, higher rainfall in the winter months
What is the role of the Wimbleball Reservoir in the River Exe basin?
regulates river flow, reduces flood risk, and ensures water availability during dry periods.
What is the Exmoor Mires Project, and how does it impact the water cycle?
The Exmoor Mires Project restores peat bogs, increasing water retention, reducing surface runoff, and lowering flood risk.
How does the Exmoor Mires Project contribute to the carbon cycle?
restores peat bogs, which act as carbon sinks by sequestering carbon and preventing CO₂ emissions from decomposed peat.
Why are peatlands important for carbon storage in the River Exe basin?
store carbon in the form of peat. When drained, they release CO₂, but restoration can reverse this, helping sequester carbon.
What are the main human impacts on the water cycle in the River Exe basin?
Key human impacts include the Wimbleball Reservoir, flood management, and land use changes (e.g., agriculture and peatland restoration).
How does agriculture in the lower River Exe catchment affect the water and carbon cycles?
Agriculture can increase surface runoff and carbon release through soil disturbance, but modern practices aim to reduce these impacts.
How does the River Exe’s geology affect its hydrograph?
The impermeable sandstone increases surface runoff, contributing to a flashy hydrograph with quick responses to rainfall.
What does the hydrograph of the River Exe look like?
The River Exe has a flashy hydrograph, with rapid increases in discharge following rainfall due to high surface runoff
What is the role of flood management in the River Exe basin?
Flood management strategies, including reservoirs and restored wetlands, help regulate river flow and reduce flood risk.
How might climate change affect the River Exe?
Climate change could increase rainfall extremes, leading to more floods, while also increasing drought risks in summer, requiring more water regulation.
