hydraulic conductivity

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hy·drau·lic con·duc·tiv·i·ty

ease of pressure filtration of a liquid through a membrane; specifically, Kf = η(Q/A) (δx/δP), where Kf = hydraulic conductivity, η = viscosity of the liquid being filtered, Q/A = volume of liquid filtered per unit time and unit area, and δx/δP = reciprocal of the pressure gradient through the membrane; solute concentrations should be identical on both sides of the membrane. Also applied more loosely to measurements on a total membrane of unknown area and thickness with unmeasured fluid viscosity (K = Q/δP).

References in periodicals archive ?

The hydrostatic root hydraulic conductivity ([k.sub.root]) was determined by measuring the steady state flow at four pressures (0.1; 0.2; 0.3; and 0.4 MPa).

Gas exchange, root hydraulic conductivity, water use efficiency and the growth of Toona ciliata clones and seedlings/Trocas gasosas, condutividade hidraulica das raizes, eficiencia do uso da agua e crescimento de mudas clonais e seminiferas de Toona ciliata

Penetration resistance (PR) for 0.1--0.2 m and 0.2--0.3 m depth, gravimetric moisture (GM) for all depths, TP for 0.1--0.2 m and 0.2--0.3 m depth, and hydraulic conductivity (K0) all had moderate variability.

Spatial variability of soil physical-hydric attributes under bovine trampling in agreste of Pernambuco State, Brazil

For this purpose, some experiments are conducted to study the behavior of the hydraulic conductivity of a sand-clay mixture.

On the influence of the spatial distribution of fine content in the hydraulic conductivity of sand-clay mixtures/Sobre la influencia de la distribucion espacial del contenido de finos en la conductividad hidraulica de mezclas areno-arcillosas

macro-pores and hydraulic conductivity) using physical amendments for facilitating salt leaching and thus creating a better condition for establishing salt-tolerant plants (halophytes), which can be used as fodder for livestock.

The effect of soil physical amendments on reclamation of a saline-sodic soil: simulation of salt leaching using HYDRUS-1D

Effect of conservation agriculture on water holding capacity (WHC), hydraulic conductivity (Kfs) and matric flux potential (Im) of soil in 0-15 cm depth under rice-wheat cropping.

IMPACT OF CONSERVATION AGRICULTURE ON SOIL PHYSICAL PROPERTIES IN RICE-WHEAT SYSTEM OF EASTERN INDO-GANGETIC PLAINS

In this study, the hydraulic conductivity tests were performed after drying and wetting of samples to a range of matric suctions between 1 and 60 kPa.

Experimental Investigation of Unsaturated Silt-Sand Soil Permeability

Hydraulic conductivity of compacted kaolin-sand specimens under high hydraulic gradients.

Evaluation of the effects of the hydraulic gradient variation on the permeability of a compacted soil/Avaliacao dos efeitos da variacao do gradiente hidraulico na permeabilidade de um solo compactado

where [K.sub.s] is the saturated hydraulic conductivity. [K.sub.r] (h) is the relative hydraulic conductivity and it is a function of the pressure head which makes the Richards equation highly nonlinear.

NUMERICAL MODELING OF UNSATURATED LAYERED SOIL FOR RAINFALL-INDUCED SHALLOW LANDSLIDES

Because of the physical characteristics of this soil, it could be said that the flow is applied in piston flow and the other hypotheses suggested by Green-Ampt, so the decrease in the quality of performance from the models is attributed to the use of an altered sample of soil, which could not be the most advisable way to estimate the hydraulic conductivity at saturation in the laboratory for soils with high contents of organic matter, and to the use of equations and a database that also do not contemplate soils with high contents of organic matter.

EVALUACION DE LA ECUACION DE INFILTRACION DE GREEN Y AMPT EN ALGUNOS SUELOS AGRICOLAS DE MEXICO, USANDO INFORMACION DEL USDA Y UN METODO MODIFICADO DE BROOKS Y COREY

Benson and Boutwell [18] investigated compaction conditions and scale dependent hydraulic conductivity of compacted clay liners.

The Compressibility and Swell of Mixtures for Sand-Clay Liners

Cline, "Effect of soil properties on unsaturated hydraulic conductivity pore- interaction factors," Soil Science Society of America Journal, vol.

Segmental Modification of the Mualem Model by Remolded Loess

All of the studies cited indicated that the negative impacts of K and Mg on the saturated soil hydraulic conductivity place them between the extremes of Na as the worst soil dispersant and calcium (Ca) as the best soil flocculant: Na > K > Mg > Ca.