3.1. Boundary Conditions and Mass Conservation

Try these first

1. 1.

   What does the steady-state assumption imply about pollutant concentrations?

   Hint

   Think about what it means for something to be steady.

2. 2.

   Define mass conservation in your own words.

   Hint

   Consider the importance of mass balance.

3. 3.

   What is a steady-state assumption in pollution modeling?

   • a) Concentrations change constantly
   • b) Concentrations remain constant over time
   • c) Concentrations can't be modeled

   Hint

   Think about what 'steady' means in physics.

4. 4.

   True or False: Boundary conditions do not impact pollutant dispersion.

   • True
   • False

   Hint

   Consider the shape and limits of the model.

5. 5.

   Given a steady pollutant emission from a source, derive the concentration equation in a fully developed Gaussian plume.

   Hint

   Start with the basic mass flow relationships in a steady system.

6. 6.

   Evaluate how varying the wind speed affects the dispersion of pollutants in a modeled environment.

   Hint

   Think about how wind carries and diffuses the emissions.