, 3
(c) The Hjulström curve graph shows the relationship between the grain size of a sediment and the
flow velocity required for erosion, transportation and deposition.
1000
Erosion
100
Flow
velocity 10
(cm s–1)
Transport Deposition
1
0.1
0.001 0.01 0.1 1 10 100 1000
Grain size (mm)
(i) State the minimum flow velocity required to erode a grain size of 1 mm.
Minimum flow velocity = ...................... Unit = ...................... [1]
(ii) State the maximum grain size that would be deposited if the flow velocity slowed to 2 cm s–1.
Maximum grain size = ...................... Unit = ...................... [1]
(iii) Explain why both axes of the Hjulström curve graph use logarithmic scales.
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