Search results for "Soil Water Retention Curve"

showing 6 items of 6 documents

Testing the shape-similarity hypothesis between partide-size distribution and water retention for sicilian soils

2012

Application of the Arya and Paris (AP) model to estimate the soil water retention curve requires a detailed description of the particlesize distribution (PSD) but limited experimental PSD data are generally determined by the conventional sieve-hydrometer (SH) method. Detailed PSDs can be obtained by fitting a continuous model to SH data or performing measurements by the laser diffraction (LD) method. The AP model was applied to 40 Sicilian soils for which the PSD was measured by both the SH and LD methods. The scale factor was set equal to 1.38 (procedure AP1) or estimated by a logistical model with parameters gathered from literature (procedure AP2). For both SH and LD data, procedure AP2 …

Arya and Paris modelSoil water retention curveLaser diffraction methodSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliParticle size distribution
researchProduct

Discussion of “Soil Water Retention Characteristics of Vertisols and Pedotransfer Functions Based on Nearest Neighbor and Neural Networks Approaches …

2013

HYDRAULIC PROPERTIESArtificial neural networkPREDICTIONSWRCSoil scienceSoil Water Retention Curve Soil Shrinkage Characteristic CurveVertisolHYDRAULIC PROPERTIES; SHRINKAGE; PREDICTION; SWRC; ANNAgricultural and Biological Sciences (miscellaneous)k-nearest neighbors algorithmPedotransfer functionSoil waterSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliSHRINKAGEANNWater Science and TechnologyCivil and Structural EngineeringMathematics
researchProduct

Analyzing the role of soil water retention curve in slope stability for differently structured soils

2016

 We analyzed the mechanical and hydrological effects of soil water retention curve (SWRC) models on the slope stability analyses of soils with unimodal and bimodal behavior.  We used three different SWRC models, two bimodal models (Ross&Smettem and Dexter) vs. the traditional van Genuchten model, to evaluate the Factor of Safety (FS) of a simple designed hillslope, based on the Bishop approach for unsaturated soils. Two formulations for term were also considered.  Results indicate that in cases of clayey soils, changes in FS obtained with different SWRC models especially at soil moisture values within the residual zone. In sandy soils the choice of formulations can be more important…

Settore ICAR/02 - Costruzioni Idrauliche E Marittime E IdrologiaSoil Water Retention Curve Slope Stability Factor of Safety
researchProduct

A simplified approach to estimate water retention for Sicilian soils by the Arya-Paris model

2014

Application of the Arya and Paris (AP) model to estimate the soil water retention curve requires a detailed description of the particle-size distribution (PSD) because the scale factor a, relating the pore length of an ideal soil to that of the natural one, depends on the particle size distribution parameters. For a dataset of 140 Sicilian soils that were grouped in five texture groups, the logistic and linear models were applied to evaluate a, and the water retention values predicted by the AP model were compared with the measured ones. Using the parameters proposed by Arya et al. (1999), the two models yielded similar unsystematic root mean error of estimate (RMSEu). Therefore, their pote…

Soil water retention curve Particle size distribution Arya-Paris modelMean squared errorCalibration (statistics)Water retention curveSoil waterStatisticsLinear modelSoil ScienceSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliLogistic regressionScale parameterWater contentMathematics
researchProduct

Testing the shape-similarity hypothesis between particle-size distribution and water retention for Sicilian soils

2012

Application of the Arya and Paris (AP) model to estimate the soil water retention curve requires a detailed description of the particlesize distribution (PSD) but limited experimental PSD data are generally determined by the conventional sieve-hydrometer (SH) method. Detailed PSDs can be obtained by fitting a continuous model to SH data or performing measurements by the laser diffraction (LD) method. The AP model was applied to 40 Sicilian soils for which the PSD was measured by both the SH and LD methods. The scale factor was set equal to 1.38 (procedure AP1) or estimated by a logistical model with parameters gathered from literature (procedure AP2). For both SH and LD data, procedure AP2 …

lcsh:AgricultureMechanical Engineeringlcsh:SSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliBioengineeringArya and Paris model laser diffraction method particle size distribution soil water retention curve.lcsh:Agriculture (General)lcsh:S1-972Arya and Paris model laser diffraction method particle size distribution soil water retention curveIndustrial and Manufacturing Engineering
researchProduct

Artificial Neural Networks for Predicting the Water Retention Curve of Sicilian Agricultural Soils

2018

Modeling soil-water regime and solute transport in the vadose zone is strategic for estimating agricultural productivity and optimizing irrigation water management. Direct measurements of soil hydraulic properties, i.e., the water retention curve and the hydraulic conductivity function, are often expensive and time-consuming, and represent a major obstacle to the application of simulation models. As a result, there is a great interest in developing pedotransfer functions (PTFs) that predict the soil hydraulic properties from more easily measured and/or routinely surveyed soil data, such as particle size distribution, bulk density (&rho

lcsh:Hydraulic engineeringneural networkSoil textureWater retention curvesoil water retention curve0208 environmental biotechnologyGeography Planning and DevelopmentSoil science02 engineering and technologyAquatic ScienceSiltBiochemistryAkaike criterion; Neural network; Soil water retention curve; Van Genuchten function; Biochemistry; Geography Planning and Development; Aquatic Science; Water Science and Technologyvan Genuchten functionlcsh:Water supply for domestic and industrial purposesHydraulic conductivityPedotransfer functionlcsh:TC1-978Settore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliWater Science and TechnologyPlanning and Developmentlcsh:TD201-500GeographySoil organic matter04 agricultural and veterinary sciences020801 environmental engineeringAkaike criterionSoil water040103 agronomy & agriculture0401 agriculture forestry and fisheriesEnvironmental scienceAkaike information criterionWater
researchProduct