Chapter 2 Solute Transport in Soil

1. Introduction

1.1. Classification of solutes, pollutants and subsurface pollution

1.2. Some basic definitions

1.3. Groundwater flow

2. Simplified description of processes in reactive transport

2.1. General

2.2. Advection

2.3. Diffusion

2.4. Dispersion

2.5. Adsorption/desorption

2.6. Decay

2.7. Full simplified mass balance equation

3. Some effects in the numerical solution of the transport equation

3.1. General

3.2. Numerical dispersion

3.3. Oscillations in the solution

3.4. Stability of the explicit solution

4. Initial and boundary conditions

5. Non-linear, non-equilibrium processes

5.1. General

5.2. Advection and dispersion

5.3. Adsorption/desorption

5.4. Chemical reactions

5.5. Biodegradation

5.6. Non Aqueous Phase Liquids (NAPL)

6. Density dependent flow and transport

6.1. General

6.2. Basic equations

6.3. Simplified equations

7. Transport in heterogeneous media

7.1. General considerations

7.2. Moment theory

7.3. The lognormal pdf

7.4. Approaches to model transport in heterogeneous media

7.5. Parallel stream tube model

7.6. Multidimensional stochastic modelling

8. Conclusion

Appendix A: Stability analysis of explicit finite difference transport equation

Author details

References