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INVERSE MODELLING OF DESORPTION TESTS TO ESTABLISH THE HYDRAULIC CONDUCTIVITY OF UNSATURATED QUEBEC GRANITIC SAND
Session: Soil Mechanics III / Mécanique des sols III
M.J. Siahdashti, Laval University (Canada)
Jean Côté, Laval University (Canada)
The Multistep outflow method (MSO) has been widely used to determine the hydraulic conductivity functions of unsaturated soils. Accurate determination of these parameters is important to predict the subsurface flow and water transport in soils. Inverse modeling methods can be used to estimate the hydraulic conductivity of unsaturated soils. These methods can be applied to the existing expressions of flow of water in unsaturated soils to fit the experimental data. In this study, inverse modeling combined with the multistep outflow data was used to estimate the unsaturated hydraulic conductivity of three reconstituted samples of the Québec Valcartier granitic sand. These tests were performed in laboratory under controlled initial and boundary conditions. During each test, soil matric suctions were measured at the bottom and within the soil sample using the transducers and microtensiometers. The commonly used models of van Genuchten (1980) and Mualem (1976) were used in this study.
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