Slides in this set

Slide 1

Preview of page 1

River processes and features…read more

Slide 2

Preview of page 2

River Basins
Rivers begin in upland areas and flow downhill where they
become wider and deeper until they enter the sea. The
source is where a river begins and the mouth is where a
river ends (meets the sea). Along a rivers journey to the
sea other smaller rivers called tributaries may join the
main river at a confluence. Rivers and their tributaries
obtain their water from the land surrounding them, this
area drained by a river is known as the drainage basin.
Any change made to part of the rivers drainage basin may
affect the natural flow of the river. The boundary of this
drainage basin is called the watershed which is usually a
ridge of high land and is the boundary between two
drainage basins. A river estuary is part of a river which is
tidal.…read more

Slide 3

Preview of page 3

Slide 4

Preview of page 4

Hydrological cycle
A drainage basin is part of the hydrological cycle
(water cycle)
in which water is recycled between the sea, air and
land. The water cycle is a closed system as no water
is ever lost or gained.…read more

Slide 5

Preview of page 5

Course of a river
The water in a river flows within a channel (unless
the river floods and spills out onto the surrounding
land). The closer we get to the mouth of the river
the wider and deeper the shape of the channel.
A river also flows within a valley, the size and shape
of the valley also changes the closer we get to the
mouth of the river. The valley changes from a V-
shaped valley to a flat, broader U-shaped valley.…read more

Slide 6

Preview of page 6

Many of these changes are due to the changes in the rivers energy
throughout the course of the river. In the uplands, near the rivers
source, the river is high above its base level, this means that the
part of the river that is nearer the source has more energy, the
main processes at work in the upper course of the river is erosional
as the river is trying to reach its base level. The river mainly erodes
in a vertical direction (downwards) which helps to create a V-
shaped valley.
As the river moves downstream it uses a lot of energy to transport
the eroded material ­ or load- surplus energy is now used to erode
sideways (lateral erosion) because the river is now closer to its
base level, meaning the valley is shaped wider and flatter.
The changes along the course of the river allow it to be broken
down into 3 sections- the upper course- middle course ­ lower
course. (Upper being near the source, lower being near the
mouth).…read more

Slide 7

Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Slide 10

Preview of page 10
Preview of page 10


No comments have yet been made

Similar Geography resources:

See all Geography resources »