Transcript Drainage Basins

All of you will create a
3D model of a drainage
basin
Most of you will know
the key terms linked to
drainage basins
Most of you will be
able to describe, using
an example, the effect
of adapting a drainage
basin
http://www.bbc.co.uk/learningzone/clips/watersheds-and-drainagebasins/3238.html
http://www.youtube.com/watch?v=sfEi8CoPVgc&safe=active
Drainage Basins
• Your book
• A template
• A stick of glue
• Scissors
• Pencil crayons- blue and brown
• A pen
Cut out the template.
Make sure you cut up the vertical line.
Using a brown crayon, shade around the
circumference of the circle.
Using a blue crayon, shade the left triangle,
draw some blue lines running from the top
of the triangle and branching out towards
the edge of the circle.
You will now need a pen. Number
the following features on your
template.
1
Watershed the area of high land
forming the edge of a river basin.
2
Source where a river begins.
3
Mouth where a river meets the sea.
4
Confluence the point at which two
rivers meet.
Tributary a small river or stream that
5
joins a larger river.
6 Channel this is where the river flows.
7 Drainage Basin this is the area of land
drained by a river and its tributaries.
Glue the remaining blank triangle.
Stick the glued triangle under the shaded
triangle, so it fits neatly.
Open your book to a double page. Glue the
triangle and the bottom sides of the
diagram. Stick this firmly across the cease of
the book. The tip of the triangle should
correspond to the cease.
It should look like this!
1
Watershed the area of high land
forming the edge of a river basin.
2
Source where a river begins.
Give your diagram the title
‘River Basin’.
3
Mouth where a river meets the
sea.
Write the numbers and
corresponding definitions into
your book.
4
Confluence the point at which
two rivers meet.
5
Tributary a small river or stream
that joins a larger river.
6
Channel this is where the river
flows.
7
Drainage Basin this is the area of
land drained by a river and its
tributaries.
Close your book!
Open your book!
Thames River Basin
12,935 square kilometres (4,994 square miles). 13 million
people live in the basin, 7 million of which live in London.
http://www.bbc.co.uk/learningzone/clips/watersheds-and-drainage-basins/3238.html
http://www.youtube.com/watch?v=sfEi8CoPVgc&safe=active
Drainage basin
1. What is the difference between a
drainage basin and a water shed?
2. How can people change a drainage
basin? (Some of these might be
similar to the changes you found
for the river system)
The Colorado River
The Colorado River, South West USA
LO: To describe how humans have adapted the drainage
basins of one of the world’s major rivers
Outcomes
All will be able to locate the Colorado
River and name its famous feature
Most will be to describe at least two
adaptations that have been made to
the Colorado River’s drainage basin
Some will be able to suggest problems
that the management of the Colorado
River has caused
1. Why is the Colorado
River so famous?
The Colorado River’s Drainage Basin
2. Where is the drainage basin of
the Colorado River? (which area
of the USA, which states etc.)
3. Which state is the source of the
Colorado River in?
4. How high (m asl) is the source of
the river?
5. What happens to the height of
the river as it travels to the sea?
6. Where is the mouth of the
Colorado River?
7. How many people depend on the
water from the Colorado?
Managing the Colorado River’s Drainage Basin
Anti flooding
Agriculture
http://www.youtube.com/watch?v=FIPV-H9iCPA&safe=active
Population Growth
Tourism
How have they managed the Colorado River?
8. The Colorado River drainage basin
(the area the river collects water
from) has a seasonal rainfall
pattern. What does seasonal
rainfall mean?
9. What have the government built to
store and transport water from
the Colorado?
Has the management of the Colorado River been a
success? Why? Explain your answer giving at least 3
points.
River Processes
LO: To describe the jobs that rivers do
All should be able to name
the processes that rivers
carry out
Most will be able to describe
the different types of erosion
and transportation
Some will be able to explain
why rivers carry out different
jobs at different stages
What is a drainage basin?
Mouth
Where the river
flows into the sea,
or sometimes a
lake.
Tributary
A river which joins a larger river.
Watershed
The boundary
dividing one
drainage basin
from another- a
ridge of high
land.
Confluence
The point at which two rivers join.
Catchment
The area from
which water drains
into a particular
drainage basin.
Source
The upland area
where the river
begins.
Processes =
things that
happen
There are 4 processes that take place in and
around rivers
1.
2.
3.
4.
Weathering
Erosion
Transportation
Deposition
Weathering
Weathering = breaking up of
rocks by weather, chemical
processes, plants and
animals
Biological – rocks are broken up by
expanding plant roots
Chemical – acid rain damage
Physical – freeze thaw. This takes
place in areas where the temperature
varies from above to below freezing.
The stress fractures and breaks up
rocks.
Erosion =
The wearing
away and
removal of
rocks by the
action of
water, wind
or ice
There are 4 types of erosion and you need to know them
all http://www.youtube.com/watch?v=LplQZUzbVWI
1. Abrasion (or corrasion)
2. Corrosion (or solution)
3. Hydraulic Action
4. Attrition
Transportation = the movement of sediment
along the river’s course
There are 4 types of transportation
1. Suspension
2. Solution
3. Saltation
4. Traction
The River Long Profile
The river profile describes how a river changes on its
journey from source to mouth.