One mechanism for the initiation of unstable flow in porous media is a condition of hydrophobicity of the porous media. Recent continuous and nondestructive measurements of water content distribution in a 2.0 m wide by 0.7 m deep trench of the Netherlands field soil containing a hydrophobic layer, reveals a complicated wetting pattern with fingered flow being quite prevalent. In this presentation we show our attempts to simulate the unstable flow pattern observed in the field using a numerical solution developed for modeling gravity driven fingered flow. The unstable flow simulation method employs a globally mass conservative finite element solution of the Richards equation applied to the soil trench. The overall unstable flow patterns of simulated saturation were similar to those of observed saturation. Statistical analysis show that the predicted saturation is close to observed saturation.
|Original language||English (US)|
|Journal||Paper - American Society of Agricultural Engineers|
|State||Published - Dec 1 1997|
|Event||Proceedings of the 1997 ASAE Annual International Meeting. Part 1 (of 3) - Minneapolis, MN, USA|
Duration: Aug 10 1997 → Aug 14 1997