Geography

Write a short notes on the following:
a. Rectangular and trellis drainage patterns.
b. Parallel and annular drainage patterns.
c. Radial and centripetal drainage patterns.
d. Dendrite and annular drainage patterns.


SOLUTION

The rectangular pattern shows some degree of re­semblance to trellised drainage pattern as tributary streams in both the patterns join their master streams almost at the right angle but the confluence angle in the trellised pattern is guided by the strikes and dip angle of the rock beds while it is determined by the lines of weaknesses (e.g. faults and fractures and joints) of the rocks in the rectangular pattern.

Parallel drainage pattern comprises numerous rivers which are parallel to each other and follow the regional slope. This pattern is more frequently devel­oped on uniformly sloping and dipping rock beds such as cuestas or newly emerged coastal plains.

Annular pattern, also known as ‘circular pat­tern’ is formed when the tributaries of the master consequent streams are developed in the form of a circle.

Radial drainage pattern, also known as centrifu­gal pattern, is formed by the streams which diverge from a central higher point in all directions.

Centripetal or inland drainage pattern  is opposite to the radial drainage pattern because it is characterized by the streams which converge at a point which is generally a depression or a basin.

The dendritic pattern on the ground is such that the network of tributaries of various orders and magnitudes of the trunk or master stream resemble the branches and roots and rootlets of a tree.

Annular pattern, also known as ‘circular pat­tern’ is formed when the tributaries of the master consequent streams are developed in the form of a circle.

 

 

 

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