1.1. Other Mechanisms of Chemical Release From Sediments – Part 1

Try these first

1. 1.

   What is diffusion?

   Hint

   Think about how a drop of food coloring spreads in water.

2. 2.

   Why are boundary conditions important?

   Hint

   Consider how you set boundaries in any investigation.

3. 3.

   What is the primary mechanism of contaminant transport discussed in this section?

   • Convection
   • Diffusion
   • Absorption

   Hint

   Remember processes that involve movement from one area to another.

4. 4.

   True or False: Boundary conditions only apply to sediment.

   • True
   • False

   Hint

   Think about modelling in various contexts.

5. 5.

   Calculate how contamination levels change over time in a sediment-water interface given a diffusion rate of 0.1 cm/s over a period of 10 hours.

   Hint

   Analyze how time and rate affect concentration profile.

6. 6.

   Discuss the potential long-term impacts of resuspension on a river ecosystem during flood events.

   Hint

   Consider both immediate and ecological effects over time.