5. Advection and Its Influence

Try these first

1. 1.

   What is advection?

   Hint

   Think about how materials move with the water current.

2. 2.

   Define bioturbation.

   Hint

   Consider what happens when organisms like worms burrow in the soil.

3. 3.

   What is the primary function of advection in aquatic environments?

   • To mix sediments
   • To carry materials by water flow
   • To promote chemical reactions

   Hint

   Think about how rivers carry sediment downstream.

4. 4.

   True or False: Resuspension increases water clarity.

   • True
   • False

   Hint

   What happens when sediments are stirred up in water?

5. 5.

   Given a sediment layer with known bulk density, calculate the impact of bioturbation by organisms on diffusion rates. Assume a 15% increase in pore space due to bioturbation.

   Hint

   Use the relationship between pore space and effective diffusivity.

6. 6.

   Examine a scenario where methane is produced in an anaerobic sediment environment. Calculate how this gas might influence chemical transport through advection.

   Hint

   Sketch a diagram of gas movement and consider how it impacts nearby chemicals.