Quantification of Surfactant-induced Unsaturated Flow in the Vadose Zone

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Library & Archives Canada, 2008 - 281 pages
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To describe the migration of surfactants in the vadose zone, it is essential to establish a description of the flow regime as well as transport model. Richards' equation is a mathematical model, which is often used to describe flow in the vadose zone. The fourth section of the thesis presents a conservative mixed formulation for the solution of the Richards equation of unsaturated flow by the finite element method. In this formulation the discharge velocity (volumetric flux) and pressure head are the primary field variables. Solution techniques for various boundary conditions including prescribed constant pressure head and constant flux are also presented in this section. The ability of the formulation to handle variably saturated domain and material heterogeneity is also established.

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