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GEOMORPHOLOGY (Key concepts (Base flow, Base level, Condensation,…
GEOMORPHOLOGY
Key concepts
Base flow
Base level
Condensation
Deposition
Drainage basin
Erosion
Evaporation
Fluvial hydrographs
Groundwater
Headward erosion
Infiltration/percolation
Interception
Perennial river/permanent river
Precipitation
Rejuvenation
River/channel flow
River discharge
River meander
River source
River mouth
Runoff/overland flow
Seasonal/periodic/non-perennial
river
Stream capture/piracy
Stream channel
Throughflow
Transpiration
Tributary
Watershed/Drainage divide
Water table
Catchment area and River Management
Importance of managing catchment areas
Impact of peope on drainage basins
Drainage systems in SA
Groundwater
Water table
Runoff and infiltration
River discharge
Flow hydrographs
time lag
Amount of vegetation
less vegetation
more runoff
more vegetation
less runoff
Steepnes of slope
Amount of rainfall
Nature of rainfall
define
Rivers
Types of rivers
Permanent
Periodic
Episodic
Stages of a river
Upper cource
Middle cource
Lower cource
Drainage basins
River systems
Drainage patterns
Dendritic pattern
Trellis pattern
Radial pattern
Drainage density
Low drainage density
high drainage density
Heavy rainfall
Steep slopes
very little vegetation
River profiles
#
Longitudinal profile
Cross profile
River capture and rejuvenation
Rejuvenation
river gets more energy
Graded profile
no kickpoints
smooth concave slope
Ungraded profile
one or more kickpoints
no longer a concave slope
river capture
one river robs another river of its water
headward erosion
infiltrates
porous rock
time for water to infiltrate
more vegetation
