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Re-Cap of the Hydrological Cycle. Task 1: What are the main processes in the hydrological cycle? 2. How is a balance maintained within the hydrological cycle?. The River Course. The Upper Course. The River Channel:

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re cap of the hydrological cycle
Re-Cap of the Hydrological Cycle

Task 1:

  • What are the main processes in the hydrological cycle?

2. How is a balance maintained within the hydrological cycle?

the upper course
The Upper Course

The River Channel:

Discharge is low at this stage. The river is fed from throughflow and groundflow.

River energy is used for vertical erosion purposes – hydraulic action and corrosion

Velocity is quick

The load consists of pebbles, cobbles, stones, sands and gravel

The Surrounding Land:

V Shaped valley

Sides are steep

Physical weathering of the land – frost action – provides debris to be transported

the middle course
The Middle Course

The River Channel:

The channel is wider at this point

Discharge is higher

The load of the river consists of silts and clay sized particles, which are often deposited at this stage, transportation of coarse materials at this stage.

Due to the less steep land, lateral erosion occurs

Velocity is still rapid, as the smooth, deep river channel reduces friction.

The Surrounding Land;

Sides are not as steep as upper course

Lateral erosion broadens the valley floor creating a flood plain

the lower course
The Lower Course

The River Channel;

The channel is now very broad and deep

The rivers load is now only fine materials carried in suspension

Deposition dominates here

Erosion does however still occur

Velocity is slow

The Surrounding Land;

Due to erosion, the land is very flat at this stage

Large flood plain

Task 2:
  • Complete questions 2,3,5,6,8,9 and 10 of the worksheet.
  • Answer Question a – g on page 13 of the New Higher Geography textbook