There are many sophisticated parametric models for estimating the size, cost, and schedule of software projects. In general, the predictive accuracy of these models is no better than within 25 percent of actual cost or schedule, about one half of the time (Thibodeau, 1981; IIT Research Institute, 1988). Several authors assert that a model's predictive accuracy can be improved by calibrating (ad...

In this paper we consider one-dimensional capillary redistribution of two immiscible and incompressible fluids in a porous medium with a single discontinuity. We study a special time-dependent solution, a similarity solution, which is found when the initial saturation is discontinuous at the same point as the permeability and porosity, and is constant elsewhere. The similarity solution can be u...

Efforts to find solutions that can be used for verification of numerical techniques for solving the Richards equation have generated a wealth of approximate and exact analytical solutions. Coefficients of this equation involve two highly non-linear functions related to the soil water potential, the unsaturated hydraulic conductivity, and the soil water content. The known exact solutions for rea...

Hydrological modeling of the unsaturated soil zone fluxes allows the transfer processes simulation through the hydrological active soil zone. The pedotransfer functions (FTP) are useful tools in the modeling process. They contain analytical functions derived through statistic optimization process using a large amount of soil information data. This paper aims to analyze the level of reliability ...

In this article, the modeling of infiltration--induced landslides, in unsaturated soils using radial basis function (RBF) method, is presented. A novel approach based on RBF method proposed to deal with nonlinear hydrological process zone. The first adopted for curve fitting build representation soil water characteristic (SWCC) that corresponds best estimate relationship between volumetric cont...

Unsaturated hydraulic conductivity (K) is a measurement of soil water-retaining ability in unsaturated soil. The properties are necessary to predict the movement water current study aims create an alternative experimental device estimate theKusing moisturesensors. set up was designed and fabricated order measure volumetric content using GS3 (Campbell) sensors at different heights. data obtained...

Hydrophobic-coated sand causes a reduction in infiltration, making it suitable for hydrophobic capillary barriers. Borosilicate glass waste was crushed into synthetic 180 µm average, and fatty acids (PFA) were extracted from palm oil sludge. The coated with PFA using mixing (POS-M) solvent-assisted (POS-S) methods stearic-acid-coated (SA) as standard at concentrations varying 1 to 16 g/kg. Cont...

Abstract Tailing dams and waste dumps formed by the accumulation of mine wastes are usually at long-term unsaturated state under evaporation consolidated drainage conditions. Soil-water retention relation is one key constitutive relations to analyze seepage processes in tailing dumps. In this study, typical coarse- fine-grained tailings from a metallurgical were chosen study soil-water characte...

Bentonite buffer materials are important components of engineered barrier systems for the disposal high-level radioactive waste produced during nuclear power generation. The design temperature material is < 100 °C, and increasing can reduce required area. This characteristic necessitates evaluation thermal–hydraulic–mechanical properties at temperatures above °C to increase its target temperatu...