The Hjulstrom curve shows the relationship between flow velocity and sediment transport, with larger particles being deposited first as velocity decreases due to losing the energy needed to transport heavier sediment, while higher velocities are required to both erode and transport larger particles due to their weight and the cohesion of smaller particles.

1. AS GEOGRAPHY
HYDROLOGY
4 QUESTIONS
REVISION
HJULSTROM
CURVE

2. DEFINITION
Hjustrom Curve is a graph showing the relationship between flow
velocity and sediment transport.

3. QUESTION 1
Describe the relationship between deposition and particle size.

4. ANSWER
As velocity decreases, particles of decreasing size are deposited, eg. the
largest particles are deposited first as a river loses velocity.

5. QUESTION 2
Explain this relationship.

6. ANSWER
As velocity decreases, the river loses energy and is unable to transport
the larger/heavier sediment, which is deposited.

7. QUESTION 3
Describe the relationship between erosion and particle size.

8. ANSWER
The larger the particle the higher the velocity needed to erode it.
Very small particles require high levels of velocity to be eroded.

9. QUESTION 4
Explain this relationship.

10. ANSWER
Large particles are heavy and require high levels of energy/velocity to be
picked up.
Very small particles require high velocities as they are compacted,
cohesive and ellectrically bonded.