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The river valley becomes flat in its lower course due to the levels of erosion occurring in the river itself. In the upper course, the river's energy is used for vertical erosion(downward erosion) in order to get to sea level. That's why you see steep V-shaped valleys or Gorges being formed. However, in the lower course when the river is at sea level, a lot of this erosion becomes lateral(horizontal) which is why you see rivers becoming a lot wider in the lower course. Therefore, because the river is no longer eroding downwards there's no longer a difference in height between it and its valley, so the river valley becomes flat.
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Where can you find wide river valleys?
In the lower course of a river. At this point the river has enough energy to erode away the sides of the valley (interlocking spurs) resulting in a "u" shaped valley (instead of "v" shaped as is typical with the upper course of a river.
Work of river at different stages?
UPPER COURSE: -v shapped valley -gorge -waterfall MIDDLE COURSE: -wider v shapped valley LOWER COURSE: -rapids -plunge pool
Describe the cross profile of a river's lower course?
As a river continues its journey towards the sea, the valley cross section continues to become wider and flatter with an extensive floodplain either side of the channel. The river erodes laterally and deposition also becomes important. By the time it reaches the lower course the river is wider and deeper and may contain a large amount of suspended sediment.
Where does the river flow quitely in the upper course of the river or the lower course of the river?
A river usually flows quickly in the upper course, as it is at a higher elevation - mountains streams, waterfalls, etc. In the lower course, it will slow down as the lower elevation means the slope is more horizontal. It is here that the river may start to meander across the valley floor, forming bends, oxbow lakes, and a flood plain.
Where are pebbles in a river upper middle or lower course of a river?
the pebbles will be in the lower course of a riverthe pebbles will be in the lower course of a river
Why does the upper course of a river valley have a different cross profile from the lower course?
It is very steep at the top and narrow but. At the bottom it isn't steep.
Does the genesee river follow a straight course or does it meander from valley wall to valley wall?
the genesee river follows a meandering course...take a look what the river looks like on google image.
Who was the frenchman who explored the lower Mississippi river valley river?
la salle
Stages of a river?
middle course, upper course, lower course...
What is in the upper course of the river severn?
v shaped valley
Whats the lower course of the river tees?
The mouth of the River Tees is at the North Sea. The lower course of the River Tees goes through Redcar near Middlesbrough.
The name yangzi is given to the lower course of the ----river?
Yangzi River.
