Hazards resulting from Mass Movements Flashcards
What are the different types of mass movement?
Creep (solidification) Flows Slides Rotational slump rock falls
how can you classify mass movement?
speed and water present
what are the most important factors determining mass movement?
Gravity
Slope angle
Pore pressure
cohesion of material
how can human activity increase mass movement risk?
- Excavations
- Loading by building, water and waste heaps
- Removal of vegetation
- Traffic vibrations
how can human activity decrease the mass movement hazard risk?
- Grouting
- Netting
- Pinning
- Shotcrete
- Gabions
- Afforestation
- Drainage
- Regrading
what is the difference between solifluction and normal creep`?
Solifuction is when the ground freezes and expands while creep is just when the ground becomes saturated with water and expands
how much does the ground expand by in solifuction?
9%
what are the ways in which you can monitor mass movements?
Strainmeter
Tiltmeter
GPS
Laser surveys
how can you determine how much water the slope can hold?
By comparing movements using GPS with rainfall
What is acceptance in terms of perception of risk?
That the environment is in control and nature cannot be changed
what is dominance in terms of perception of risk?
The idea that humans can provide ‘technological fixes’ and control the environment by engineering and tech.
What is adaptation in terms of perception of risk?
People perceive that they can adopt their environments to prevent hazards
Give an example of acceptance of mass movement
The withdrawal of protection from some areas of the coast line in the UK
Give an example of dominance of mass movement
People in California were so confident that they could lubricate faults with oil that they built a large hospital on the San Andreas Fault
