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Gilbert vs Davis (Gilbert (negative feedbacks occur after disturbances…
Gilbert vs Davis
Gilbert
functional approach w/mechanics
negative feedbacks occur after disturbances
process effects can runaway
dynamic equilibrium
considers event magnitude i.e. response to high mag
what happened before = less important
steady state equibrium with time
open system
Davis
more gradual, progressive change
change from one state to another and so on
evolutionary /historical
importance of history - what happened before
decay into flat landscape before rejuvenation
long timescales
closed system
Gilbert
mutual adjustment between present forms and processes
functional approach
negative feedbacks
equilibrium form restored after disturbance
by high magnitude - low frequency event
Davis
progressive change in landscape through time
evolutionary approach
dynamic
equilibrium
over hundreds kyr
high magnitude low frequency events
episodes severe erosion lower channel floor / gradient
over Myr
mountains elevation erodes down
channel bed elevation decreases
rate of elevation lowering declines as bed approaches base level
channel gradient so low erosion wanes