Syllabus PointDefine (AO1) stream discharge. Examine (AO3) its relationship to stream flow and channel shape.
Key TerminologyDefine the terms below using your 'IB Geography. Course Book' by Cooke and Nagle, the command term posters in the classroom and the links below.
Useful Links
Activity One - WatchWatch the following clip and answer the following questions:
Activity Two - DrawBelow is a digram which represents Hjulstrom's theory. Hjulstrom's theory illustrates how fast the water needs to be to carry a certain size of sediment. If the velocity of the river falls then heavier material will be deposited. If the velocity increases then more sediment can be transported and the greater chance that erosion will take place. For us in Switzerland we have seen the impact that snow melt has on the velocity of our rivers and the large boulders the rivers can then carry.
Activity Three - Turbulent and Laminar FlowLook at the two diagrams below.
Diagram 1
Diagram 2
Activity Four - Channel ShapeThe shape of the river will effect its efficiency. The efficiency of the river is measured by calculating its hydraulic radius.
Hydraulic radius - This is the ratio between the length of the wetted perimeter and the cross section of the river.
Activity Five - The Bradshaw ModelThe Bradshaw Model illustrates the changing characteristics of a river through its three courses; upper, middle and lower. You will be using this model to help justify your hypotheses for the Internal Assessment.
Exam Style QuestionExplain the relationship between stream flow and channel shape. (6 marks) |