. Flashcards
What is a natural event?
An event caused by the earth without social impact
What is a natural hazard?
An natural event that has a social impact
5 examples of natural events
Volcanic eruptions/earthquakes/storms/tsunamis/floods
Factors affecting risk from natural hazards
- Poverty
- Urbanisation
- Farming
- Climate change
Why live at risk from tectonic hazards
- Fertile soils
- Tourism
- Poverty
- Resources
Reducing the risks of tectonic hazards
- Monitoring
- Planning
- Prediction
- Protection
Proof of climate change
- Shrinking glaciers and ice sheets
- Rising sea levels
- Seasonal changes
Natural causes of climate change
- Volcanic activity-Emits sulphur dioxide, a greenhouse gas
- Earths orbit-Earth tilts from 21* to 23*
- Sun heat output-when at maximum the sun is letting out most heat
Human causes of climate change
- Carbon dioxide emission, eg burning if fossil fuels
- Methane, eg livestock
- Nitrous oxides, eg car exhausts
Managing the impacts of climate change
- Carbon capture
- Planting trees
- Alternative energy sources
- International agreements
Reducing the effects of tropical storms
- Monitoring
- Protection
- Planning
Economic developments of rainforests
Gains
- Development of agriculture
- Tax for government
- Improved infrastructure
- Raw materials
- Hydroelectric power is cheap and renewable.
- Gold can be sold
Losses
- Water shortages
- Fires can burn out of control
- Rising temperatures can ruining farming
- Plants become extinct(medical benefits)
- Tourist number decreases
Opportunity and challenges in (Svalbard) Cold Environments
Opportunity
- Mineral extraction
- Energy supply
- Fishing
- Tourism
Challenges
- Extreme temperatures
- Construction
- Services
- Accessibility
Rivers
Uses
- Transport
- Hydroelectricity
- Tourism
- Agriculture
- Source
- Confluence
- Meander
- Tributary
- Drainage basin
- River bank
- River bed
- River channel
- Floodplain
- Bed load
- Watershed
- Mouth
- Where river starts
- Where two rivers join
- Large corner in river
- Where small river joins a big one
- Area of land drained by a river
- Land on either side of a river
- Base of river
- Where river flows
- Land alongside river
- Rocks transported by the river
- Edge of drainage basin
- Where river meets lake or sea
River erosion
- Solution- acidic river dissolves rocks like limestone
- Hydraulic action- force of flowing water on base of river
- Attrition- where particles brush off one another
- Abrasion- where stones hit the side and base of the river
Factors of river erosion
- Load
- Velocity of river
- Gradient
- Geology
- pH
River landforms
- Interlocking Spurs
- Waterfalls
- Flood plains
- Levees
- Meanders
- Check notes
Physical factors of flooding
- Precipitation
- Geology
- Steep slopes
Human factors of flooding
- Urbanisation
- Deforestation
- Agriculture
Preventing flooding-> hard engineering
- Embankments
- Dams
- Channel straightening
- Flood relief
Preventing flooding-> soft engineering
- Preparing
- Wetlands and flood storage area
- Floodplain zoning
- River restoration
Storm hydrograph
Notes
Glacial landscapes
- Corries
- Glacial trough
- Truncated Spurs
- Hanging valleys
- Ribbon lakes
- Erratics
- Drumlins
- Moraine
* see notes
Conflict in glaciated areas
- Quarrying
- Tourism
- Water storage