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Tuesday, November 07, 2006
S4 Homework
Please post a comment to describe the change in velocity of the Winceby Beck from source to mouth. (for Thursday)
5 comments:
Anonymous
said...
The changes in velocity of the Winceby Beck is that at the sourse of the river it would have a slow velocity as the river would not be strong yet. As the river goes further downstream the velocity would increase because the river would have become larger therefore gaining power and speed. As the river becomes stronger it will be able to carry materials such as rocks and debris. When the river eventually reaches the mouth, it will be at its strongest and be meandering most at this part of its course as it is strongest here.
in the upper course there are waterfalls and hills so the river will flow faster. In the lower course, the river is also flowing downhill. In the middle coures, however, the river meanders a lot and the land the river flows over is quite flat, so it would flow more slowly.
It is very hard to come up with a simple rule about river velocity-it used to be assumed that rivers flow fastest in the upper course-becasue steep gradients=fast rivers and that they are much more sluggish in the lower course, because the gradient is much more gentle. In fact the average velocity of a river remains fairly constant; what does change are particular velocities, eg faster on the outer bend of a meander, slower on the inner bend. Rivers flow faster when there is less friction, eg boulders or pebbles, to overcome.
at the source of the river it would be slow but as it reached steeper slopes it would speed up and as other small rivers join it the amount of water will increase and so will the speed if. the river then starts to meander and appears to be slower but on the outside of the meander it is moving a lot faster than the inside so the water, on average is still flowing at the same speed
5 comments:
The changes in velocity of the Winceby Beck is that at the sourse of the river it would have a slow velocity as the river would not be strong yet. As the river goes further downstream the velocity would increase because the river would have become larger therefore gaining power and speed. As the river becomes stronger it will be able to carry materials such as rocks and debris. When the river eventually reaches the mouth, it will be at its strongest and be meandering most at this part of its course as it is strongest here.
can you suggest why the velocity of the river drops halfway down river, so that it is slower in the moddle course than the upper or lower course?
in the upper course there are waterfalls and hills so the river will flow faster. In the lower course, the river is also flowing downhill. In the middle coures, however, the river meanders a lot and the land the river flows over is quite flat, so it would flow more slowly.
It is very hard to come up with a simple rule about river velocity-it used to be assumed that rivers flow fastest in the upper course-becasue steep gradients=fast rivers and that they are much more sluggish in the lower course, because the gradient is much more gentle. In fact the average velocity of a river remains fairly constant; what does change are particular velocities, eg faster on the outer bend of a meander, slower on the inner bend. Rivers flow faster when there is less friction, eg boulders or pebbles, to overcome.
at the source of the river it would be slow but as it reached steeper slopes it would speed up and as other small rivers join it the amount of water will increase and so will the speed if. the river then starts to meander and appears to be slower but on the outside of the meander it is moving a lot faster than the inside so the water, on average is still flowing at the same speed
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