Influence of Unsaturated Soil Properties Uncertainty on Moisture Flow Modeling |
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| Authors: | Email author" target="_blank">H?B?DyeEmail author S?L?Houston B?D?Welfert |
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| Institution: | (1) Tao Engineering, Mesa, AZ, USA;(2) School of Sustainability and the Built Environment, Arizona State University, Tempe, AZ, USA;(3) Deptartment of Mathematics and Statistics, Arizona State University, Tempe, AZ, USA |
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| Abstract: | The quality of a numerical modeling solution of moisture flow through unsaturated soil, in part, depends on properly described
unsaturated soil properties. The variability of the Soil Water Characteristic Curve, SWCC, is attributed to hysteresis and
reproducibility of measurement. Because the unsaturated conductivity function is rarely directly measured, the variability
of the unsaturated soil hydraulic conductivity function is attributed to the uncertainty associated with the estimation of
this parameter with currently available fitting functions, and hence a range of reasonable variation was considered. One-dimensional
modeling of expansive soil under dry initial conditions (suction of 1,500 kPa) was performed; both potential evaporation and
infiltration boundary conditions were considered. It was found that small variations in the unsaturated soil hydraulic conductivity
function result in significantly different modeling outputs, as expected, while substential variation in SWCC alone (assuming
the same unsaturated soil hydraulic conductivity for all SWCCs) produced almost identical soil response in terms of soil suction
when the slope of the SWCC is similiar. Thus, proper characterization of the slope of the SWCC is important to proper suction
profile determination. |
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