Question

When does a Trellis pattern develop?

• A. When the river channel follows the slope of the terrain.
• B. When a river joined by its tributaries at approximately right angles.
• C. When a pattern develops on a strongly jointed rocky terrain.
• D. When streams flow in different directions from a central peak or dome like structure.

Answer 1

The correct option is B When a river joined by its tributaries at approximately right angles.

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• Trellis drainage pattern
  
• The geometry of a trellis drainage system is similar to that of a common garden trelliesused to grow vines.
  
• As the river flows along a strike valley, smaller tributaries feed into it from the steep slopes on the sides of mountains.
  
• These tributaries enter the main river at approximately 90 degree angle, causing a trellis-like appearance of the drainage system.
  
• Trellis drainage is characteristic of folded mountains, such as the Appalachian mountains in North America and in the north part of Trinidad.