Hydraulic Properties of a Porous Medium: Measurement and Empirical Representation

Gillham, Robert W.; Klute, A.; Heermann, Dale F.

doi:10.2136/sssaj1976.03615995004000020008x

Cited by 95 publications

(45 citation statements)

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“…7, so that sometimes hysteresis may be neglected. Similar water contenthydraulic conductivity relationships for adsorption and desorption were observed by Topp and Mifler (1966), Topp (1969), and Gillham et al (1976). Water transport As water flow processes in soil are shown to be influenced by hysteresis, it appears desirable to include both adsorption and desorption functions of hydraulic conductivity in water transport models, so that water flux can be calculated in agreement with the respective flow process.…”

Section: Resultssupporting

confidence: 62%

“…While most authors have repeatedly shown that the Q-h and the K-h functions show hysteresis, only some results revealed hysteresis in the K-8 functions (Staple, 1966; Poulovussilis and Tzimus, 1975). Mostly, the K-O relationship has shown to be without noticeable hysteresis ( Nielsen and Big-gar, 1961;Topp, 1969;Gillham et al, 1976). However, so far only disturbed soil columns (usually sand or sandy loam) and columns packed with artificial soil-like materials have been studied.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory equipment and calculation procedure to rapidly determine hysteresis of some soil hydrophysical properties under nonsteady flow conditions

Sobczuk

Plagge

Walczak

et al. 1992

J Plant Nutrition & Soil

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Laboratory equipment was developd to meapure nonsteady w a r potential and water content profiles in soil columns. with a high resolution in time and space. Moisture content was monitored using TDR-minipmbes and water potential was measuRd with microtensiometen. Gradients were applied by controlling h e water potential at the bottom of the soil column during adsorplion and deswption with rhe aid of a ceramic plate. Rw descrikd experimental setup was designed specifically to determine effects of hysteresis on he water contenf/water potential and water poientiaVhydraulic conductivity relationships in undisturbed soilIn addition, an algorithm to prccess Ute dam and to calculate he above mentioned relationships is presented. The algorithm includes the smoothing of dam w i t h Bezier functions b e f m h e calculation of the moisture retention curves and the conductivity functions. Results obtained hom an albic E-horizon of a silty Luvisol are presented exemplarily to demonstrate the applicability of the PlDposed method in studying hysteresis effecls.samples.

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Section: Resultssupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Laboratory equipment and calculation procedure to rapidly determine hysteresis of some soil hydrophysical properties under nonsteady flow conditions

Sobczuk

Plagge

Walczak

et al. 1992

J Plant Nutrition & Soil

View full text Add to dashboard Cite

show abstract

“…Computational experiments were carried out using this program and experimental data on sandy soil Dune sand [2]. The first experiment consisted in tuning (identifying the parameters) of all models from data on the main branch of desiccation and the main branch of moistening of the soil under investigation.…”

Section: Resultsmentioning

confidence: 99%

“…Literature data on the water-retention capacity of light granulometric composition soil Dune sand are used in the paper [2].…”

Section: Methodsmentioning

confidence: 99%

Five models of hysteretic water-retention capacity and their comparison for sandy soil

et al. 2018

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Abstract.A description of five mathematical models of the water-retention capacity of soil is given, taking into account the hysteresis phenomena. A computational experiment was carried out with these models using data on sandy soil. The experiment consisted of: (i) tuning of the models (parameter identification) by the method of dot-approximation of experimental data on the main drying and wetting branches of the hysteresis loop using an optimizing algorithm; (ii) the predictive calculation of the scanning branches of the hysteresis loop; (iii) a comparison of the errors in tuning results and the predictive calculation using the Williams-Kloot criteria. The commensurate and sufficiently low errors in the adjustment of the models have been achieved. The differences in the calculation of the scanning hysteresis branches are revealed. The practical significance of the mathematical models presented is to ensure the calculation of precision irrigation rates. The application of such rates in irrigation farming will help to prevent excess moisture from flowing beyond the root layer of the soil under the influence of gravity and, thus, to minimize the losses (unproductive consumption) of irrigation water, fertilizers, meliorants and plant protection products, and also reduce the risk of groundwater contamination with agrochemicals and eutrophication of water bodies.

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“…17 (McKim et al, 1976). Since the tensiometer/transducer system has a millivolt output, it is well suited for automatic (including satellite relay) recording systems (McKim et al, 1975;Elzeftawy and Mansell, 1975;Gillham et al, 1976).…”

Section: Tensiometric Techniquesmentioning

confidence: 99%

Survey of methods for soil moisture determination

Schmugge¹,

Jackson²,

Mckim³

1980

Water Resources Research

358

141

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With increased interest in soil moisture information for applice.tions in stch disciplines as hydrology, meteorology and agriculture, an overview is needed of both existing and proposed methods for soil moisture determination. This paper discusses the methods of in-situ soil moisture determination including gravimetric, nuclear, and electromagnetic techniques; remote sensing approaches that use the reflected solar, thermal infrared, and microwave portions of the electromagnetic spectrum; and soil physics models that track the behaviour of water in the soil in response to meteorological inputs (precipitation) and demands (evapotranspiration). The capacities of use approaches to satisfy various user needs for soil moisture information varies from application to application, but a conceptual scheme for merging these approaches into integrated systems to provide soil moisture information is proposed that has the potential for meeting various application requirements.

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Hydraulic Properties of a Porous Medium: Measurement and Empirical Representation

Cited by 95 publications

References 0 publications

Laboratory equipment and calculation procedure to rapidly determine hysteresis of some soil hydrophysical properties under nonsteady flow conditions

Laboratory equipment and calculation procedure to rapidly determine hysteresis of some soil hydrophysical properties under nonsteady flow conditions

Five models of hysteretic water-retention capacity and their comparison for sandy soil

Survey of methods for soil moisture determination

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