Field studies of solute fate and transport in streams and rivers often involve an experimental release of solutes at an upstream boundary for a finite period of time. A review of several standard references on surface-water quality modeling indicates that the analytical solution to the constant-parameter advection-dispersion equation for this type of boundary condition has been generally overlooked. Here an exact analytical solution that considers a continuous load of finite duration is compared to an approximate analytical solution presented elsewhere. Results indicate that the exact analytical solution should be used for verification of numerical solutions and other solute transport problems wherein a high level of accuracy is required.

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Beginning of document
Introduction
Analytical Solutions

• Continuous Source of Infinite Duration
  
• Continuous Source of Duration
  

Results/Conclusions
Acknowledgments
Appendix I. References
Appendix II. Notation

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