Coasts 3. How do coastal landforms evolve over time as climate changes?
- Created by: DanBish
- Created on: 04-05-22 13:32
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- How do coastal landforms evolve over time as climate changes?
- Emergent
coastal landscapes
form as sea level
falls
- Falls in Sea Level
- Eustatic - Sea level falls as less water
- Isostatic - Sea level falls as land rises
- Climate changes
- Mount Pinatubo erupted in 1991, emitting so much sulfur dioxide that Earth's climate cooled by 1.3degrees from 1991 to 1994
- Landforms
- Raised beaches are wave-cut platforms, that have been leftover after the sea level has fallen
- A warming climate could see sea level rise again and the emergent landforms subject to marine erosion once more.
- Rock terraces are where a sea cliff, and raised beach, meet
- A warming climate could see sea level rise again and the emergent landforms subject to marine erosion once more.
- Abandoned cliffs are the cliffs that did lead to the sea level, but are now raised due to the sea level falling
- Raised beaches are wave-cut platforms, that have been leftover after the sea level has fallen
- Falls in Sea Level
- Submergent
coastal landscapes
form as sea level
rises.
- Rises in Sea Level
- Eustatic - Sea level rises as more water
- Isostatic - Sea level rises as land sinks down
- Flandrian Transgression
- Last glacial period is known as the Würm Glaciation. Warming over last 25,000 years called Flandrian Transgression
- Sea level was ~120m lower
- Landforms
- Rias are river valleys flooded by rise in sea level. Typically have gently sloping sides, and an irregular winding course.
- Kingsbridge Estuary, Devon, UK - This ria is 4 miles in length and 0.3 miles in width, at widest point
- Increased global warming + further rises in sea level likely to increase water depth in rias, extending inundated area inland
- Kingsbridge Estuary, Devon, UK - This ria is 4 miles in length and 0.3 miles in width, at widest point
- Fjords are glacial u-shaped valleys flooded by rise in sea level. They're much deeper and narrower than rias, and can extend back inland for a hundred miles or more.
- Milford Sound, South Island, NZ - This fjord is 10.5 miles long, and 1.25 miles in width at it's widest point
- Increased global warming + further rises in sea level likely to increase water depth in fjords, increasing denudation of valley sides.
- Milford Sound, South Island, NZ - This fjord is 10.5 miles long, and 1.25 miles in width at it's widest point
- Shingle Beaches are beaches built up of sediment from the Würm glacial period, which was pushed onshore by wave action
- Chesil Beach, Portland, UK - This shingle beach contains ~100million tonnes of shingle
- Shingle beaches likely to be damaged by erosion due to increased warming of the climate. This is because sea level will rise further, there will be increase in storm frequency, increasing magnitude of marine erosion.
- Chesil Beach, Portland, UK - This shingle beach contains ~100million tonnes of shingle
- Rias are river valleys flooded by rise in sea level. Typically have gently sloping sides, and an irregular winding course.
- Rises in Sea Level
- Emergent
coastal landscapes
form as sea level
falls
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