Rejuvenation

Rejuvenation

1. Rivers work depends on energy

   • The height the water has to fall downhill to reach sea level -potential energy
     • Mass of water im motion - kinetic energy
     • increases vertical erosion

2. Isostatic change

   • land rise
     • crustal movements

3. Eustatic change

   • sea level fall
     • growth of ice caps during glaciation

4. Landforms of rejuvenation

   • Incised meanders
     • When vertical erosion is slow, meander migrates into new flood plain
       • Asymmetrical valleys with steep cliffs on outside bend
   • Entrenched meanders
     • rapid vertical erosion
       • creating a winding gorge.
   • Knick points
     • sudden changes to in a rivers gradient. Series of sea level change, series of steps.
   • River terraces
     • River cuts into floodplain to reach new graded profile.
       • leaves old floodplaun as a terrace on valley side

5. when a river changes from being in equilibrium with its landscape to being dominated by erosion