AQA GCSE Geography revision notes for rivers. These notes helped me exceed a grade 9 in my geography gcse last summer. As well as being well presented, they are detailed and contain all of the required knowledge to enable success in your geography gcse! - The case study included is the Banbury fl...
smaller river, main channel
joins
Mouth : end river + sea octon or lake
of ,
Confluence where I rives
:
point join
Channel : main part of river
Watershed edgeof rive basin
:
of land by river
River basin :
An area drained a and itstributaries
shows how gradient changes
↓
The Gingprose I
I Valley ↑
-
channel
j
short prosite
-
I
a
water
shows what the cross-section
of river looks the
Path of river is called a course
"Steep uppercourse /Steep)---
*
Gently sloping middle course /medium) --- cross
profile can be
changed by
Flatish lower course
(gentle) vertical
-
↳
+
lateral erosion !
Form channels
valleys
+
Erode landscape transport
,
eroded material +
deposited ~deepens vally/channel
u
So-high
tarbalance
shape of valley changes depending on erosion/deposition -S ertical LP particles erode downwards on bed
lupper course
downwards
erosish
widens
valley /channel during
So formation of meanders
m
I
Lateral
Ener e n e rg
Hydraulic action : force of water
hitting riverbed
↳
has a
bigger effect when the water is moving
faste in a
larger quanting
Abrasion eroded rocks
:
picked up by river scrape against channel ,
wearing it
away
Attrition
:
stones carried Menod
by river
against lachother
making them smalle and more rounded
Solution water dissolves roch
:
river
x chalh limestone
,
Transportation I movement
of eroded material)
material carried
by rivers a load
=
Traction Boulders
~solution ~Suspension
:
+
pebbles pushed along riverbed by water
forc
-
m e e
:.
Saltation Pebble :
sized particles are
pushed along rivebed
by water
fore
~Saltation
Suspension : Small particles (day and silt) carried by water ↳: i
Saluble materials dissolve get carried Straction
:
Solution water and
along
in
ofwaterfalls
amount of eroded material
increases ( ~water is shallower ↑volume
reaches mouth
~rirew
Deposition =
river drops eroded material
greater load greater velocity needed to carry
,
"Whenvelocitydropslangerboulders get deposited
is see
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