Which of the following statements is/are correct? 1. Himalayan rivers have their origin in the snow-covered areas, hence are dry in winter season. 2. Rivers of the Peninsular Plateau have reached maturity. 3. Himalayan rivers depict all the three stages of normal cycle of erosion. Select the correct answer using the code given below.
2 and 3 only
Analyzing Statements on Indian Rivers: Himalayan and Peninsular Systems
Let's carefully examine each statement regarding the characteristics of Himalayan rivers and rivers of the Peninsular Plateau.
Statement 1: Himalayan rivers and Winter Flow
The statement claims that Himalayan rivers, originating in snow-covered areas, are dry in the winter season. This is incorrect.
- Himalayan rivers are primarily fed by two sources: melting snow/glaciers and rainfall (monsoon).
- While snowmelt contributes significantly in summer, rainfall is a major source during the monsoon season.
- Even in winter, although snowmelt is minimal, some flow is maintained by the base flow from underground water storage and limited snowmelt at lower altitudes. More importantly, they are not typically 'dry' but have reduced flow compared to summer/monsoon. Their perennial nature (flowing throughout the year) is a key characteristic distinguishing them from many seasonal rivers.
Therefore, Statement 1 is false because Himalayan rivers are perennial and do not become dry in winter.
Statement 2: Peninsular Rivers and Maturity Stage
The statement says that rivers of the Peninsular Plateau have reached maturity. This is generally true for most Peninsular rivers.
- Peninsular rivers are much older than the Himalayan rivers in terms of their geological formation and evolution.
- They flow through a stable, old plateau region with a relatively gentle gradient (except for some sections near the Western Ghats).
- Over geological time, these rivers have eroded their valleys laterally, resulting in wide, shallow valleys.
- Characteristics like gentle slopes, wider valleys, meandering courses (in the lower reaches), and the absence of deep gorges or significant waterfalls (except at plateau edges) indicate a mature stage in the cycle of erosion.
Therefore, Statement 2 is correct as Peninsular rivers are predominantly in the mature stage of their erosional cycle.
Statement 3: Himalayan Rivers and Erosion Stages
The statement suggests that Himalayan rivers depict all three stages of the normal cycle of erosion. This is also true.
- The normal cycle of erosion includes the Youth, Mature, and Old stages.
- Himalayan rivers, being relatively young and flowing through a geologically active and rising mountain region, exhibit characteristics of all stages along their lengthy course:
- Youth Stage: In the upper mountainous courses, they flow rapidly down steep gradients, forming deep gorges (like the Indus, Brahmaputra, and Ganga), V-shaped valleys, rapids, and waterfalls. This represents the youthful stage characterized by vertical erosion.
- Mature Stage: As they descend into the plains, the gradient decreases. The rivers start eroding laterally, developing meanders, and floodplains begin to form. This represents the mature stage where lateral erosion becomes significant.
- Old Stage: In their lower courses before joining the sea, the gradient is very gentle. The rivers develop large meanders, oxbow lakes, distributaries, and build extensive deltas (like the Ganga-Brahmaputra delta). This represents the old stage dominated by deposition.
Therefore, Statement 3 is correct as Himalayan rivers show features of youth, mature, and old stages from their source to their mouth.
Conclusion on Indian River Characteristics
Based on the analysis:
- Statement 1: Incorrect
- Statement 2: Correct
- Statement 3: Correct
The correct statements are 2 and 3.
| Feature | Himalayan Rivers | Peninsular Rivers |
|---|---|---|
| Origin | Snow-covered mountains, glaciers | Peninsular Plateau (hills/plateau) |
| Flow Nature | Perennial (snowmelt + rain) | Seasonal (rain-fed) |
| Valley Shape | Deep gorges, V-shaped valleys (youth) | Wide, shallow valleys (mature/old) |
| Erosion Stage | Exhibit Youth, Mature, Old stages | Mostly Mature stage |
| Course Length | Longer | Shorter |
| Delta Formation | Large deltas (e.g., Ganga-Brahmaputra) | Smaller deltas or estuaries |
Revision Table: Comparing River Systems
Let's quickly review the key differences between the two major river systems based on the statements analyzed.
| Statement | Correctness | Reason |
|---|---|---|
| 1. Himalayan rivers are dry in winter. | Incorrect | They are perennial, fed by snowmelt and rain, maintaining flow in winter. |
| 2. Peninsular rivers have reached maturity. | Correct | They are older, flow through a stable plateau, and have wide, shallow valleys characteristic of maturity. |
| 3. Himalayan rivers depict all three erosion stages. | Correct | Their long course from steep mountains to flat plains shows youth, mature, and old stage features. |
Additional Information: Cycle of Erosion and River Stages
The concept of the cycle of erosion was primarily developed by W.M. Davis. It describes the evolution of landforms sculpted by rivers over geological time. The three main stages are:
- Youth Stage: Characterized by vigorous downcutting (vertical erosion). Features include steep gradients, V-shaped valleys, gorges, rapids, and waterfalls. Rivers are actively deepening their beds.
- Mature Stage: Vertical erosion slows down, and lateral erosion becomes dominant. The valley widens, the gradient decreases, and the river begins to meander. Floodplains start to develop.
- Old Stage: Erosion is minimal. Deposition is the main process. The landscape becomes almost flat (peneplain). Rivers have broad, shallow channels, extensive meanders, oxbow lakes, and form deltas at their mouth. The river's primary role is transporting sediment rather than eroding land.
Understanding these stages helps explain the differing characteristics observed in different river systems like the young, dynamic Himalayan rivers and the older, more stable Peninsular rivers.
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