“Hurricane force winds batter the UK. “ (bbc, 12 feb)
Why is this not a hurricane though?
HW
Bring in a news paper article on the causes of the flooding in Somerset
Find out 10 impacts of flooding in Somerset (Figures and place names)
Due in on monday
Middle and lower course of the river
By the end of the lesson you will;
1)Be able to describe the key changes that occur as you move down the river from source to mouth
2)Be able to explain how a range of features have been formed in the middle and lower course of the river
3)Have applied your new knowledge on an exam question
Changes in the river;
Task
1.Describe the main changes that occur as you move from the source to the mouth of the river
2.Add in as many key words as possible
Key wordsGradient Velocity Width Deposition Erosion Transportation
Middle and lower course of the river
By the end of the lesson you will;
1)Be able to describe the key changes that occur as you move down the river from source to mouth
2)Be able to explain how a range of features have been formed in the middle and lower course of the river
3)Have applied your new knowledge on an exam question
Different features;
Task
You are going to have one feature in the middle and lower course
You need to make notes as to how this feature is formed
You should;
1)Explain how the feature is formed?
2)Describe the key erosional methods occurring
3)Add in a diagram
4)Explain how the feature will change in the future
Key features
MeanderOxbow lake Delta Levee
Oxbow lake;
Gradually over time, erosion will make the neck of the meander come closer and closer
On the bend of the river, the water will flow the fastest
An oxbow lake will happen on a meander in the middle course of a rive
This will lead to the formation of a river beach
On the inside of the bend, the water will flow the slowest
This will lead to the formation of a river cliff
During a period of high energy, the river will take the shortest route, which is straight across the neck of the bend
Over time, there will be deposition, which will fill in the bend. It will become completely detached from the river
Over time, the water will be evaporated away from the ox bow lake and it will be dry.
This will cut the bend off, and the river will now flow in a straight line
An Oxbow lake is found in the middle and Lower course of the river. It is a depositional feature
Use the information to explain how it has been formed
Lower course; Delta
Some of these methods include traction, saltation and suspension
The river will also reach the mouth where it meets the sea
Over time, these will develop into little islands which emerge out of the water
This leads to any material being deposited in the river channel
The river will loose the energy to transport the sediment
This will lead to material being deposited in the river channel
When the river reaches the lower course, the gradient is much smaller and the ground is almost flat
This will mean that the water is not moving
They will be held down by vegetation, which will prevent them from being eroded
A* Detail; An example of a delta is the Mekong Delta in Vietnam
Lower course; Levees
Upper / Middle/ Lower?
Match up the following key features to the section of the river which they occur in.
Upper Middle Lower
Lower course;
Study the following picture
Describe the changes in the landscape you can see
Pupils should be able to describe relief and landscape from a map using terms such as ridge, plateau, scarp, floodplain) and adjectives such as broad, flat, steep, deeply cut, gently sloping) -
Middle and lower course of the river
By the end of the lesson you will;
1)Be able to describe the key changes that occur as you move down the river from source to mouth
2)Be able to explain how a range of features have been formed in the middle and lower course of the river
3)Have applied your new knowledge on an exam question
What have you learnt?
1. Describe the processes leading to the formation of a waterfall (5 marks)
Criteria Achieved
Erosional processes included
Key features included (cap rock, plunge pool, Gorge)
Examples of different rock type are included
Spelling and grammar is effective (less than 3 mistakes)
Middle and lower course of the river
By the end of the lesson you will;
1)Be able to describe the key changes that occur as you move down the river from source to mouth
2)Be able to explain how a range of features have been formed in the middle and lower course of the river
3)Have applied your new knowledge on an exam question
What have you learnt?