2:30 PM - 2:45 PM
[AHW34-15] Numerical Simulations of Vertical Water Redistribution in Sand using COMSOL and HYDRUS Software
Keywords: Water redistribution, Richards' equation, Tensiometers, Numerical Simulation
In this work, we used both 1D and 2D models using Richards equation to simulate this vertical redistribution process. Both COMSOL and HYDRUS-1D were used to solve 1D model, while COMSOL was employed to solve 2D model. In 1D simulations, equilibrium time is found to increase linearly during free drainage process, as the length of the column increases. It is 1.4 d for the length of 50 cm, which is employed in experiments. In 2D simulations, water saturation profiles are non-uniform along the width of the domain at earlier time steps, while become almost uniform when it reaches equilibrium. By comparison, the average saturation distribution along the column in 2D simulations considering different values of width is exactly the same as the one in 1D simulations. The simulated results are to be compared with experimental results.