Journal ArticleDOI
Developing joint probability distributions of soil water retention characteristics
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In this paper, a method is presented for developing probability density functions for parameters of soil moisture relationships of capillary head [h(θ)] and hydraulic conductivity [K(α), which are required for the assessment of water flow and solute transport in unsaturated media.Abstract:
A method is presented for developing probability density functions for parameters of soil moisture relationships of capillary head [h(θ)] and hydraulic conductivity [K(θ)]. These soil moisture parameters are required for the assessment of water flow and solute transport in unsaturated media. The method employs a statistical multiple regression equation proposed in the literature for estimating [h(θ)] or [K(θ)] relationships using the soil saturated water content and the percentages of sand and clay. In the absence of known statistical distributions for either [h(θ)] or [K(θ)] relationships, the method facilitates modeling by providing variability estimates that can be used to examine the uncertainty associated with water flow or solute transport in unsaturated media.read more
Citations
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Journal ArticleDOI
rosetta: a computer program for estimating soil hydraulic parameters with hierarchical pedotransfer functions
TL;DR: In this paper, the authors describe a computer program, rosetta, which implements five hierarchical pedotransfer functions (PTFs) for the estimation of water retention, and the saturated and unsaturated hydraulic conductivity.
The RETC code for quantifying the hydraulic functions of unsaturated soils
TL;DR: The RETC computer code as mentioned in this paper uses the parametric models of Brooks-Corey and van Genuchten to represent the soil water retention curve, and the theoretical pore-size distribution models of Mualem and Burdine to predict the unsaturated hydraulic conductivity function from observed water retention data.
Journal ArticleDOI
Soil physical quality: Part I. Theory, effects of soil texture, density, and organic matter, and effects on root growth
TL;DR: In this paper, a soil physical parameter, S, is defined, which is equal to the slope of the soil water retention curve at its inflection point and is used as an index of soil physical quality that enables different soils and the effects of different management treatments and conditions to be compared directly.
Journal ArticleDOI
Using groundwater levels to estimate recharge
Richard W. Healy,Peter G. Cook +1 more
TL;DR: A review of methods that are based on groundwater-level data is presented in this article, where the theory underlying the methods is explained and examples from the literature are used to illustrate applications of the different methods.
Journal ArticleDOI
Development and Applications of the HYDRUS and STANMOD Software Packages and Related Codes
TL;DR: A review of the history of development, main processes involved, and selected applications of HYDRUS and related models and software packages developed collaboratively by several groups in the United States, the Czech Republic, Israel, Belgium, and the Netherlands can be found in this paper.
References
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Journal ArticleDOI
A closed-form equation for predicting the hydraulic conductivity of unsaturated soils
van Genuchten,M. Th. +1 more
TL;DR: Van Genuchten et al. as mentioned in this paper proposed a closed-form analytical expression for predicting the hydraulic conductivity of unsaturated soils based on the Mualem theory, which can be used to predict the unsaturated hydraulic flow and mass transport in unsaturated zone.
Journal ArticleDOI
Estimation of Soil Water Properties
TL;DR: In this article, a comprehensive search of the literature and data sources for hydraulic conductivity and related soil-water data was made in 1978 and data for 1,323 soils with about 5,350 horizons from 32 states were assembled.
Journal ArticleDOI
A simple method for determining unsaturated conductivity from moisture retention data
TL;DR: In this article, the unsaturated hydraulic conductivity function for soil can be calculated directly from a moisture retention function and a single measurement of hydraulic conductivities at some water content, and agreement of k calculated using this procedure with experimentally determined conductivities for five soil samples was found to be at least as good as with other calculation procedures.
Book
Introduction to soil physics
TL;DR: In this article, the task of Soil Physics is addressed and the basic relationships of soil physics are discussed, including texture, particle size distribution, specific surface, and specific surface properties.