Measurement and Modeling of Unsaturated Hydraulic Conductivity

Determination of unsaturated hydraulic conductivity by internal drainage assuming a uniform soil water profile

تخمین منحنی مشخصه رطوبتی و هدایت هیدرولیکی غیراشباع خاک در تراکم‌های

Hydraulic conductivity is an important parameter in the design of geotechnical structures such as earth dam, floor construction, retaining walls and environmental structures. In unsaturated soils, hydraulic conductivity is a function of moisture content and soil water suction i.e. soil moisture characteristic curve. In this study, the values of unsaturated hydraulic conductivity in two soil typ...

ارزیابی هدایت هیدرولیکی نقطه عطف منحنی مشخصه رطوبتی به عنوان مرجع در برخی مدل‌های هدایت هیدرولیکی غیراشباع خاک

Direct measurement of soil unsaturated hydraulic conductivity (K(h) or K(θ)) is difficult and time-consuming, and often in many applied models, predicting hydraulic conductivity is carried out according to measurements of soil retention curve and saturated hydraulic conductivity (Ks). However, using KS as a matching point in many procedures may result in over-estimation of unsaturated hydraulic...

Selection of Intermodal Conductivity Averaging Scheme for Unsaturated Flow in Homogeneous Media

The nonlinear solvers in numerical solution of water flow in variably saturated soils are prone to convergence difficulties. Many aspects can give rise to such difficulties, like very dry initial conditions, a steep pressure gradient and great variation of hydraulic conductivity occur across the wetting front during the infiltration of water.  So, the averaging method applied to compute hydraul...

Effective Unsaturated Hydraulic Conductivity

Steady-state and transient one-dimensional unsaturated flow in vertically stratified porous media are examined. Saturated hydraulic conductivity and the alpha parameter of the exponential hydraulic conductivity function were assumed to vary from soil layer to soil layer. The use of effective unsaturated hydraulic conductivity to compute matric potential in the soil profile is demonstrated. Resu...