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Full-Text Articles in Engineering
Effects Of Hysteresis With Air Entrapment On Water Flow In The Unsaturated Zone, Jagath J. Kaluarachchi, J. C. Parker
Effects Of Hysteresis With Air Entrapment On Water Flow In The Unsaturated Zone, Jagath J. Kaluarachchi, J. C. Parker
Civil and Environmental Engineering Faculty Publications
Effects of hysteresis with air entrapment on water content and head distributions, surface fluxes, and water balance components are investigated by finite element simulations of flow in one- and two-dimensional spatial domains. Results of one-dimensional analyses indicate that effects of hysteresis are markedly influenced by surface boundary conditions and to a lesser extent by initial conditions. Stipulation of flux-controlled boundary conditions results in minimal hysteretic effects, while potential-type boundary conditions produce substantial deviations between hysteretic and nonhysteretic simulations. The latter effects are attributable in large part to differences in surface conductivity associated with air entrapment. Predicted water content distributions for …
Finite Element Analysis Of Water Flow In Variably Saturated Soils, Jagath J. Kaluarachchi, J. C. Parker
Finite Element Analysis Of Water Flow In Variably Saturated Soils, Jagath J. Kaluarachchi, J. C. Parker
Civil and Environmental Engineering Faculty Publications
A two-dimensional Galerkin finite element model for water flow in variably saturated soil is presented. A fourth-order Runge-Kutta time integration method is employed which allows use of time steps at least 2 times greater than for a traditional finite difference approximation of time derivatives. For short total simulation times computer execution costs for the Runge-Kutta method are greater than for the finite difference approximation due to the start up cost of the Runge-Kutta method, but for longer simulation times the Runge-Kutta method requires considerably less computational effort even when automatic time-step adjustment is used with the finite difference procedure. A …