sediment modelling

• Turbidity - the clarity of a fluid depending on the volume of suspended particles 
• Hjulstrom curve shows clay and silt isn't deposited at slow speeds - turbidity. 

  • Deposition requires them to clump together 
  • Naturally repel each other so aren't deposited 
  • Clay and silts are found at estuaries and deltas 
  • Salt causes flocculation 
• Observations made in flume tanks and rivers to show velocity changes. 

  • Increases make bedforms - ripple marks 
  • Low velocities result in flat beds