2.6. Modeling and Flux Calculation

Try these first

1. 1.

   What does D-NAPL stand for?

   Hint

   Think about the density comparison with water.

2. 2.

   Which is denser, D-NAPL or L-NAPL?

   Hint

   Visualize how each type behaves in water.

3. 3.

   What is a D-NAPL?

   • A type of solid
   • A dense liquid
   • A gas

   Hint

   Remember the density comparison.

4. 4.

   True or False: L-NAPL can be found below the water surface.

   • True
   • False

   Hint

   Think about the behavior of lighter substances in water.

5. 5.

   You have an area where D-NAPL was released into a river with a known flux. Calculate how long it would take for the concentration to stabilize at the sediment-water interface if the diffusion coefficient is given as X m²/s.

   Hint

   Consider using Fick's law for diffusion calculation.

6. 6.

   Analyze the historical sediment contamination in a city river, evaluating how changes in industrial practices over decades have reduced recent fluxes of contaminants.

   Hint

   Correlate industrial changes with sediment contamination patterns.