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The factor which is not primarily responsible for meander in an alluvial river, is
- a)variation of discharge
- b)excess silt load
- c)deficient silt load
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The factor which is not primarily responsible for meander in an alluvi...
The widely accepted theory behind meandering is based upon the extra turbulence generated by the excess of river sediment during floods. During floods, the river carries tremendous amount of silt charge. When the silt charge is in excess of the quantity required for stability, the river starts building up its slope by depositing the silt on its bed. This accretion is the primary process, which leads to meandering.
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The factor which is not primarily responsible for meander in an alluvi...
Explanation:
Meander in an alluvial river is primarily responsible for the variation of discharge and excess silt load. However, deficient silt load is not responsible for meander. Let's discuss these factors in detail.
Variation of Discharge: The flow of water in a river is not constant throughout the year. It varies with the season, rainfall, and other factors. When the discharge of water increases, it erodes the outer bank of the river, which results in a shift of the river's course towards the opposite bank. This shifting of the river's course is known as meander.
Excess Silt Load: The river carries a considerable amount of sediment or silt. When the discharge of water decreases, the sediment accumulates on the river bed, which results in the formation of a point bar or a sandbar. This sandbar causes the river to bend towards the opposite bank, resulting in a meander.
Deficient Silt Load: When the river has a deficient silt load, it does not have enough sediment to deposit on the river bed. Therefore, the river's course does not shift towards the opposite bank, resulting in a straight channel. Hence, deficient silt load is not responsible for meander in an alluvial river.
Conclusion:
Meander in an alluvial river is primarily responsible for the variation of discharge and excess silt load. A deficient silt load is not responsible for meander.
Meander in an alluvial river is primarily responsible for the variation of discharge and excess silt load. However, deficient silt load is not responsible for meander. Let's discuss these factors in detail.
Variation of Discharge: The flow of water in a river is not constant throughout the year. It varies with the season, rainfall, and other factors. When the discharge of water increases, it erodes the outer bank of the river, which results in a shift of the river's course towards the opposite bank. This shifting of the river's course is known as meander.
Excess Silt Load: The river carries a considerable amount of sediment or silt. When the discharge of water decreases, the sediment accumulates on the river bed, which results in the formation of a point bar or a sandbar. This sandbar causes the river to bend towards the opposite bank, resulting in a meander.
Deficient Silt Load: When the river has a deficient silt load, it does not have enough sediment to deposit on the river bed. Therefore, the river's course does not shift towards the opposite bank, resulting in a straight channel. Hence, deficient silt load is not responsible for meander in an alluvial river.
Conclusion:
Meander in an alluvial river is primarily responsible for the variation of discharge and excess silt load. A deficient silt load is not responsible for meander.
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