Early stochastic studies focused on steady-state, gravity-dominated unsaturated flow in unbounded domains In this study, on the basis of the van Genuchten–Mualem constitu(e.g., Yeh et al., 1985a,b; Russo, 1993, 1995a,b; Yang et tive relationship, we develop a general nonstationary stochastic model for transient, variably saturated flow in randomly heterogeneous meal., 1996; Zhang et al., 1998; ...

Undisturbed peatlands are effective carbon sinks and provide a variety of ecosystem services. However, anthropogenic disturbances, especially land drainage, strongly alter peat soil properties jeopardize the benefits peatlands. The effects disturbances should therefore be assessed predicted. To support accurate modeling, this study determined physical hydraulic intact disturbed samples collecte...

Loess is very widely distributed, and the unsaturated hydraulic conductivity of loess related to many engineering issues. To determine remoulded more conveniently at a lower cost, filter paper test soil column seepage were carried out. The results indicate that in one-dimensional process, increases with increase volumetric water content, as time continues, from top depth 40 cm gradually becomes...

En publicaciones previas se presentó un modelo numérico con capacidad para estudiar patrones de filtración bajo condiciones riego por goteo. Las pruebas realizadas concluyeron que el es robusto y eficiente independencia las características del suelo. Paralelamente, analítico simplificado contorno asumibles en goteo superficial, describe la evolución bulbo tiempo función caudal aplicado, base a ...

Accurate inversion of soil hydraulic parameters based on the van Genuchten–Mualem model has received much attention in science research. Herein, a hybrid algorithm method using particle swarm optimization and vector-evaluated genetic was used to invert θs, α, n, Ks, with objective functions infiltration rate, cumulative infiltration, water content. Then, numerical experiments were conducted fou...

When calculating of the moisture transport in concrete such geotechnical structures as a pile or diaphragm wall, contact with soil is forming special boundary conditions. If full saturated state, then Darcy’s law should be used to solve problem, condition for which water pressure. Otherwise, Bažant- Najjar model used, relative humidity environment at certain temperature. The temperature unique ...