Drainage Patterns Variations in bedrock composition influence the drainage pattern of a landscape. This is because some rocks are more resistant to weathering.

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Presentation transcript:

Drainage Patterns Variations in bedrock composition influence the drainage pattern of a landscape. This is because some rocks are more resistant to weathering and erosion than others. We can categorize stream drainage patterns into 4 main types... Diagram from: http://wps.prenhall.com/wps/media/tmp/labeling/2130130_dyn.jpg

Dendritic Drainage Pattern Similar to the branches of a tree. Form in regions where there is a relatively uniform resistance of bedrock to weathering. Overhead view: Cross-section:

Radial Drainage Drainage from a central point of higher elevation, such as the top of a volcano or mountain. The pattern extends outward from the highest elevation. The Adirondack Mountains display this type of drainage. Overhead view: Cross-section:

Trellised Drainage Tributaries are at nearly 90° angles to the stream. Overhead view: I took picture flying to Colorado Cross-section: Over Colorado (DiLallo)

Annular Drainage Appears ring-shaped as they form near circular bedrock structures that have been eroded. Overhead view: Cross-section: