Interlocking spurs. Image credit geography.org.uk

Interlocking spurs. Image credit geography.org.uk

ZIMSEC O Level Geography Notes: Interlocking spurs and steep-sided valleys

  • Interlocking spurs are a result of water taking the easiest path down the slope and tending ot go round resistant rock resulting in a winding course.
  • The bends become more pronounced with time because water flows faster at the bends and erodes the sides leading to the projections/spurs to interlock.
  • The undercut concave banks stand up as river cliffs while the opposite convex develop into a slip off slope as there is very little erosion.
Interlocking spurs. Image credit slideshare.net

Interlocking spurs. Image credit slideshare.net

  • Interlocking spurs occur mainly in the upper course section of streams and rivers as rivers have little energy to erode.

Steep sided valleys

A narrow steep-sided valley.

A narrow steep-sided valley.

  • Since water flows in small amounts and in predominantly steep areas in the upper course section vertical erosion is more dominant than lateral erosion.
  • This also facilitated by the load which the river carries because it cannot reach the upper levels of the valley walls once they have been formed so much of corrasion processes are limited to the lower sections of the river and this tends to deepen the channel.
  • The result are V-shaped steep sided valleys.

To learn more about landforms resulting from river action go to this page.

To access more topics go to the Geography Notes page.

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