The Long Profile of a River Flashcards

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Why is the cross profile of a river valley narrow and steep sided in the upper course?
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It becomes narrow and steep-sided in the upper course due to vertical erosion.

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Why is the cross profile of a river valley narrow and steep sided in the upper course?
In the middle course of the river valley floor becomes wider why is this?
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The increase in lateral (sideways) erosion.

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In the middle course of the river valley floor becomes wider why is this?
What is the long profile of the river?
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The long profile shows the gradient of the river from its source to mouth.

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What is the long profile of the river?
Why does the river channel become wider and deeper with distance downstream?
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The river channel becomes deeper due to the increase in discharge and wider due to lateral erosion.

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Why does the river channel become wider and deeper with distance downstream?
Why do discharge and velocity increase downstream?
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Discharge increases downstream because of additional water from tributaries. Velocity increases due to the additional water from tributaries and less water is in contact with the bed and banks so there is less friction.

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Why do discharge and velocity increase downstream?




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