Rivers and river valleys
What is the long profile of a river?
Internet GeographyForget the hint, go with your head!
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The long profile shows the gradient of a river as it journeys from source to mouth.
The long profile of a river is a way of displaying the channel slope (gradient) of a river along its entire length. True or False?
Internet GeographyIt's one of two possible answers ;-)
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The long profile of a river is a way of displaying the channel slope (gradient) of a river along its entire length.
A river tries to achieve a smooth curve to reach its base level at sea; this is called a cross section. True or False?
Internet GeographyIt's one of two possible answers ;-)
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A river tries to achieve a smooth curve to reach its base level at sea; this is called a graded long profile.
Which section of the long profile is concave?
Internet Geography
Correct!
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The middle course of the long profile of a river is concave.
Where does the long profile start?
Internet GeographyThe photo above is not a clue!
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The long profile of a river starts at its source.
Which stage of the long profile is shown in the image above?
Internet GeographyLook at those interlocking spurs!
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Which stage of the long profile is being described below? Transportation mainly involves large boulders being moved by traction.
Internet Geography
Correct!
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Transportation in the upper stage main involves large boulders being moved by traction.
The velocity of water in a river is greater in the upper stage than the lower stage of the long profile of a river. True or false?
Internet GeographyVelocity is affected by the proportion of water in contact with the bed and the banks.
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The velocity of a river increases downstream because a lower proportion of water comes into contact with the bed and the banks reducing friction.
Which part of the long profile has the deepest channel?
It's not the middle course!
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The lower course of the river has the deepest channel. This is because the volume of water is the greatest.
At which stage of the river does lateral erosion take over from vertical erosion as the predominant type of erosion?
Internet GeographyIt's not in the upper course.
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Lateral erosion takes over from vertical erosion as the predominant type of erosion in the middle course.
