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river processes and landforms (types of erosion (corrosion (river…
river processes and landforms
the work carried out by river
erosion
material is worn away and
removed from its channel
river become deeper or wider
deposition
the largest material is deposited first
the lightest material is deposited last
happens when
there is a decrease in gradient
there is discharge
the river meets the sea or a lake
the river flows more slowly
on the inside of bends
loan
material being transported
process of transportation carries downstream
sand
silt
pebbles
mud
boulders
types of erosion
corrosion
river dissolves some types of rock
abrasion
eroded rocks rub against the channel against
the cliff wearing it away
hydraulic action
water breaks rock particles away from river channel
attrition
eroded rocks picked up by the river smash
into each other
vertical
a river cuts down into its bed
lateral
the sides of the bed are eroded away
headward
it causes the river valley to grow very slowly upstream
general transportation processes
suspension
small particles are carried along by the water
traction
large particles are pushed along the bottom of the river bed by the force of the water
solution
soluble materials dissolve in water and
are carried along
saltation
pebble sized particles are bounced along
the river bed by the force of the water
river
parts
tributaries
they are rivers that feeds into another rivers
riverbank
the land next to the river
channel
meandering
braided
straight
it's the course of the river. Its shape depends how much water has been flowing in it for how long
delta
it is the ending of a river. This finish in a lake or in a sea
river source
the beginning of a river. It can be huge.
Some come from the ground,other are marshy areas
fed by mountain snow
confluence
the point where two river join
drainage basin
the area of a land a river gets its water from. It is defined by the watershed
watershed
an imaginary line marking out the drainage basin
course
lower
delta
the channel is forced to split up and is gets blocked if the sea
doesn't wash away the material. Eventually the material builds up
so much that low lying areas that are called delta
flood plain
when a river flows in it, the water slows down and deposits the eroded material. Meanders mgrate across the flood plain making it wider. The deposition helps to build up the flood plain
levees
are natural embankments. During a flood eroded
material is deposited. Overtime deposited material builds up creating a leevs
middle
meanders
erosion takes place on the river bend forming a cliff. The current is slower because the channel is shallower. So eroded material is deposited on the inside forming a slip-off slope
ox-bow lake
erosion causes the outsidee bends to become closer and the river breaks through
upper
waterfall
created when the river flows in an area where there are hard rock following by soft rock. Soft rocks erode creating a steep. As the water goes over the step it eroded more and more of the softer rock. A steep drop is created,which is called waterfall
interlocking spurs
the river eroded vertically downwards creating V-shaped valley
flooding
managment
man-made levees
flood warnings
channel straightening
preparation
dams and reservoirs
flood plain zoning
causes
physical
geology
relief
snow melt
human
urbanisation
deforestation