Rivers, Floods and Management: Valley Profiles

Valley Long Profiles
1. High in the mountains there is a steep gradient. This results in the river tumbling over rapids and waterfalls.
2. On reaching the lowlands, the gradient becomes gentler.
4. Graded Profile: Smooth concave long profile of a river that has achieved a state of equilibrium with its environment.
5. Changes in sea level may affect the long profile.
Valley Cross Profiles
1. The cross profile of a valley also changes with distance downstream.
2. Close to its source, a river usually flows through a narrow, steep-sided valley.
3. With increasing distance downstream, the valley becomes wider and less steep.
4. The river also tends to increase in size - both in width and depth - because it is carrying more water and more energy.

Resumo de Recurso

	Criado por Andrew_Ellinas mais de 12 anos atrás