Geosphere- Landscape Shaping Processes Flashcards
What is the principle of mass conservation
Mass cannot be created or destroyed
What is the equation to work out change in land surface elevation
Change in land surface elevation = amount of uplift or subsidence + balance between sediment supply and removal
Height change due to erosion =
Volume removed DIVIDED BY surface area
Equilibrium in the landscape can only be achieved when
Uplift = denudation
Is there equilibrium in Davis’ model
No. Rapid uplift in beginning (perturbation) then everything relaxes
What do diffusive processes explain the movement of
Sediment movement due to surface gradient. Not sensitive to water discharge
Eg landslides and soil creep
Advective processes explain the movement of
Sediment by water driven processes
River fan incision takes place when …
Sediment supply < river transport capacity
Arid regions are characterised by yearly precipitation amounts …
Between 50 and 250mm/year
Example of a geomorphological feature that is a result of glacial erosion
Eskers
How many channels does an anastomosing river have and are they stable
Multiple stable channels
As discharge increases in the river which sediment is most likely to erode first
Sand
What is shown on the x and y axis of the hjulstrom diagram
X axis is sediment diameter
Y axis velocity
Equation to work out total sediment flux
Frequency * magnitude
What do negative feedbacks do
Dampen initial disturbances
