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Unit 1 - Lanscapes of the UK
River Landforms
Middle Course
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Cards (4)
Meander
- a bend in a river
Meanders:
Water moves
fastest
on the outside so the banks are
eroded
through
hydraulic action
and
abrasion
or weakened by
biological
weathering
Process continues making river more
sinuous
River bank is
undercut
through
erosion
creating a
river cliff
Water moves
slowest
on the inside so
deposition
occurs forming a
slip off slope
Ox-bow lake:
Meanders neck is
narrowed
as it becomes more
sinuous
River is
closer
together due to
erosion
(
hydraulic
action
and
abrasion
)
Water takes the
quickest
route in
floods
/
high discharge
so flows across neck
Straight
river course forms
cutting
off old
meander
Material is
deposited
to stop
water flow
and over time it
drys out
- turns into
marshland
In the middle course, there is a
smaller
load that's less
angular
and the river is
deeper
and
wider
due to
lateral erosion.