Classifying coasts 2B.1 b
- Created by: Em29
- Created on: 27-09-21 15:48
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- CLASSIFYING A COASTAL LANDSCAPE:
- Long Term Criteria:
- GEOLOGY:
- Geology-all the characteristic of land, including lithology (rocky type) and structure (arrangement of rock units)
- Geology is used to classify coasts as rocky, sandy or estuarine or concordant/ discordant
- SEA LEVEL CHANGE:
- sea level change can be used to classify coasts as emergent or submergent
- this can be caused by tectonic processes or climate change
- TECTONIC PROCESSES:
- they can lift sections of land up, causing local sea level to fall
- or make sections of land subside causing local sea level to rise
- they can lift sections of land up, causing local sea level to fall
- CLIMATE CHANGE:
- climate change cause sea levels to rise and fall in a 100,000 yr cycle due to the change in the Earth's orbit shape
- sea levels fall for 90,000 yrs during glacial period as ice sheets expand and rise for 10,000 yrs during interglacials
- climate change cause sea levels to rise and fall in a 100,000 yr cycle due to the change in the Earth's orbit shape
- TECTONIC PROCESSES:
- GEOLOGY:
- Short Term Criteria:
- ENERGY INPUTS:
- Coasts receive energy inputs from waves (main input), tides ,currents. Rivers and atmospheric processes, and tectonics.
- It can be used to classify coasts as high energy / low energy.
- Coasts receive energy inputs from waves (main input), tides ,currents. Rivers and atmospheric processes, and tectonics.
- SEDIMENT INPUTS:
- Coasts receive sediment inputs from waves and wind (vary constantly with weather), tides), currents, mass movement and tectonic processes.
- Sediment is added to a coastline through deposition and removed by erosion.
- Where erosion > deposition there is a net loss of sediment and the coastline retreats -- an eroding coastline.
- Where deposition > erosion there is a net gain of sediment and the coastline advances -- an outbuilding coastline.
- Coasts receive sediment inputs from waves and wind (vary constantly with weather), tides), currents, mass movement and tectonic processes.
- ENERGY INPUTS:
- Long Term Criteria:
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