question for class10 Discribe with suitable sketcher any two depositional land forms of river
Answers
Answer:
- As a river goes around a bend, most of the water is pushed towards the outside. This causes increased speed due to less friction and therefore increased erosion (through hydraulic action and abrasion).
- The lateral erosion on the outside bend causes undercutting of the river bank to form a river cliff.
- There is less water on the inside bend of a meander so friction causes the water to slow down, lose energy and deposit the material the river is carrying, creating a gentle slope.
- The build-up of deposited sediment is known as a slip-off slope (or sometimes river beach).
Explanation:
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Answer:
Upper Course / Stage of Youth (Erosion dominates):
It starts from the source of the river in hilly or mountainous areas.
The river flows down the steep slope and, as a result, its velocity and eroding power are at their maximum.
Streams are few, with poor integration.
As the river flows down with high velocity, vertical erosion or downward cutting will be high which results in the formation of V-Shaped Valleys.
Waterfalls, rapids, and gorges exist where the local hard rock bodies are exposed.
Middle Course/ Stage of Maturity (Transportation dominates):
In this stage, vertical erosion slowly starts to replace with lateral erosion or erosion from both sides of the channel.
Thus, the river channel causes the gradual disappearance of its V-shaped valley (not completely).
Streams are plenty at this stage with good integration.
Wider flood plains start to visible in this course and the volume of water increases with the confluence of many tributaries.
The work of river predominantly becomes transportation of the eroded materials from the upper course (little deposition too).
Landforms like alluvial fans, piedmont alluvial plains, meanders etc. can be seen at this stage.
Lower Course/ Stage of Old (Deposition dominates):
The river starts to flow through a broad, level plain with heavy debris brought down from upper and middle courses.
Vertical erosion has almost stopped and lateral erosion still goes on.
The work of the river is mainly deposition, building up its bed and forming an extensive flood plain.
Landforms like braided channels, floodplains, levees, meanders, oxbow lakes, deltas etc. can be seen at this stage.
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