A Differential Evolution (DE) is introduced to predict the parameters of the soil water retention curve (SWRC) and it is configured for reliability and efficiency with the Unsaturated Soil Hydraulic Property Database (UNSODA). The main investigated dataset is 235 samples from lab_drying_h-t table and the testing shows that the data resource is reliable and steady. Some specific statistical comp...

[1] Commonly, a soil’s relative permeability curve is predicted from its measured water retention curve by fitting equations that share parameters between the two curves (e.g., Brooks/Corey-Mualem and van Genuchten-Mualem). We present a new approach to predict relative permeability by direct application of measured soil water retention data without any fitting procedures. The new relative perme...

Saturated hydraulic conductivity Ksat is a fundamental characteristic in modeling flow and contaminant transport in soils and sediments. Therefore, many models have been developed to estimate Ksat from easily measureable parameters, such as textural properties, bulk density, etc. However, Ksat is not only affected by textural and structural characteristics, but also by sample dimensions e.g., i...

abstract in recent years, many researchers have attempted to estimate the soil hydraulic functions (e.g. soil moisture characteristics curve, and hydraulic conductivity function) using particle-size distribution (psd) curve. in these studies, an accurate mathematical representation of psd is required for fitting the observed data. so far, some mathematical models were developed with different l...

Based on the Tao and Kong (TK) model fractal of soil–water characteristic curve, a simplified relationship between saturated permeability coefficient air-entry value is established in this study: ks = k0ψa−2. It shown that soil determined by its maximum pore size. In order to facilitate mutual prediction saturation value, based data five types UNSODA database, comprehensive proportionality cons...

ABSTRACT: The physical and chemical characteristics of a soil determine its hydraulic properties, such as conductivity, infiltration, moisture. Due to the usefulness soil's moisture retention characteristic curve, several methodologies have been developed obtain it. Mathematical models for prediction this property constitute type that is economical very affordable. One most practical model Arya...

Particle size distribution (PSD) is a fundamental physical property of soils. Traditionally, the PSD curve was generated by hand from limited data of particle size analysis, which is subjective and may lead to significant uncertainty in the freehand PSD curve and graphically estimated cumulative particle percentages. To overcome these problems, a log-cubic method was proposed for the generation...

The application of machine learning (ML) methods has proven to be promising in dealing with a wide range geotechnical engineering problems recent years. ML have already been used for the prediction soil water retention curves (SWRC) and estimation air-entry values (AEV). However, reported works literature are generally based on limited data conventional, less accurate approaches AEV estimation....

Many soils and other porous media exhibit dual- or multi-porosity type features. In a previous study (Seki et al., 2022) we presented multimodal water retention closed-form hydraulic conductivity equations for such media. The objective of this is to show that the proposed are practically useful. Specifically, dual-BC (Brooks Corey)-CH (common head) (DBC), dual-VG (van Genuchten)-CH (DVC), KO (K...