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Want to stay connected with the latest deals? Email address. Zip Code. Enter your address to view what's available near you Why do we ask for your address? Street address. ZIP code. Call: Call: Glossary of internet terms. Though the river capture is a natural process, but it does not take place in all circumstances rather it requires certain necessary conditions. A particular river of a locality having deeper valley, more volume of water, steeper channel gradient and hence higher velocity and kinetic energy and flowing over less resistant and softer rocks than the other river of that region resorts to more powerful headward erosion than the latter, and thus may usurp the water and upper reaches of the weaker river.
It is apparent from the above discussion that the process of river capture is effected by erosion of different sorts viz. Headward and lateral erosion is the most powerful geomorphological process of river capture.
The capture of the course of a particular river by the other river through the intersection of meanders occurs mostly during late maturity and senile stage old stage. Most of the river captures occur due to headward erosion. The nature and intensity of headward erosion of any stream largely depends on the potential energy height of the divide and the steepness of the side slope of the water divide.
Generally, the side slopes of the divide are unequal. Consequently, the erosive power of the former becomes much more than the latter.
The powerful stream pushes the water divide backward towards the side of gentle slope through active headward erosion. Since the valley floor of the stream of the steeper side of the divide is lower than the valley floor of the stream of the gentler side of the divide and hence the former captures the headwater of the latter.
The process of river capture may be explained with the help of an example. Consequent streams originate on the slopes of any uplifted landmass. The most active and the longest consequent is called the master consequent. It is, thus, apparent that A stream is more active than B stream. A few subsequent or lateral consequent streams emerge from the ridge fig.
For example, C and D are the tributaries of streams A and B respectively. These two tributaries take their sources on both the slopes of the same ridge. The valley of C would be also deeper than the valley of D stream because the valley of the master stream of C A is deeper than the valley of the receiving stream of D B. Thus, the headward erosion by C stream would be more active and vigorous than the headward erosion by D stream. The water divide is gradually pushed back towards the source of the stream D because of more active headward erosion by C stream.
Bjornstad, Bruce N. Sandpoint, ID: Keokee, Alt, David D. Missoula, MT: Mountain Pub. Hess, Darrel, and Tom L. McKnight, Darrel Hess.
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