retentivity


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retentivity

[‚rē‚ten′tiv·əd·ē]
(electromagnetism)
The residual flux density corresponding to the saturation induction of a magnetic material.
References in periodicals archive ?
This study describes the effects of PAM on the saturated hydraulic conductivities and the soil water retentivity of a number of coarse-textured soils.
Water retentivity was determined using standard pressure plate apparatus.
Marion JM, Rolston DE, Kavvas ML, Biggar JW (1994) Evaluation of methods for determining soil-water retentivity and unsaturated hydraulic conductivity.
1) Solution method Finite difference Water flow description Richard's equation (mobile only) Macropore flow Not represented Runoff/erosion Not considered Solute transport Convection-dispersion equation Dispersion Required as input K-[Theta]-h Estimated from retentivity data relationship using Campbell's equation Plant growth Yes Evapotranspiration Calculated from pan data or from Linacre's equation Pesticide sorption Linear or Freundlich, 2-site possible (K.
Soil hydraulic properties (K-[Theta]-h relationship) were obtained by fitting the retentivity data for the first 4 layers of soil (0-40 cm) to Campbell's equation (Eqn 1) to obtain the values for constants a (air-entry value) and b (Campbell's exponent).
Using the water retentivity and hydraulic conductivity curves of Moore, which he extrapolated to low water contents, and the soil water diffusivity defined by Childs and Collis-George, he estimated the components of the soil water diffusivities in the liquid and vapor phases for isothermal conditions.