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Effect of mixed Na/Ca solutions on hydraulic properties of unsaturated soils
Year:
1977
Authors :
Russo, David
;
.
Volume :
Co-Authors:

DAVID Russo
ESHEL BRESLER

Facilitators :
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0
To page:
0
(
Total pages:
1
)
Abstract:

The effects of mixed Na-Ca solutions on soil water diffusivity and unsaturated hydraulic conductivity were tested for a loamy soil from Gilat, Israel. Soil water diffusivity functions, D(ff), were determined by the horizontal infiltration method. Unsaturated hydraulic conductivity functions, K(ff), were determined both directly (by vertical infiltration for suction heads of 0-50 cm H2O) and indirectly (from diffusivity functions and soil water retention curves). Prior to determinations, soil samples were equilibrated with solutions containing a given concentration and composition of Ca and Na. The results show that D(ff) and K(0) are independent of solution concentrations in a Ca-saturated system. In mixed Na-Ca systems, hydraulic conductivity and soil water diffusivity functions are highly dependent on the composition and concentration of the soil solution, in addition to their dependence on soil water content, 0. For any given 0, both K(0) and D(0) decrease as either soil solution concentration decreases or the sodium fraction in the soil solution increases. The negative effect of a combination of high Na-to-Ca ratio and low soil solution concentration on K(ff) is directly related to the degree of water saturation of the soil. Low values of 0 can compensate for the negative effects of high Na-toCa ratio and low solution concentration.

Note:
Related Files :
soil-water retentivity
Soil solution concentration
soil water diffusivity
Unsaturated hydraulic conductivity
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Publication Type:
article
;
.
Language:
English
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ID:
55902
Last updated date:
02/03/2022 17:27
Creation date:
15/08/2021 16:04
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Scientific Publication
Effect of mixed Na/Ca solutions on hydraulic properties of unsaturated soils

DAVID Russo
ESHEL BRESLER

Effect of mixed Na/Ca solutions on hydraulic properties of unsaturated soils

The effects of mixed Na-Ca solutions on soil water diffusivity and unsaturated hydraulic conductivity were tested for a loamy soil from Gilat, Israel. Soil water diffusivity functions, D(ff), were determined by the horizontal infiltration method. Unsaturated hydraulic conductivity functions, K(ff), were determined both directly (by vertical infiltration for suction heads of 0-50 cm H2O) and indirectly (from diffusivity functions and soil water retention curves). Prior to determinations, soil samples were equilibrated with solutions containing a given concentration and composition of Ca and Na. The results show that D(ff) and K(0) are independent of solution concentrations in a Ca-saturated system. In mixed Na-Ca systems, hydraulic conductivity and soil water diffusivity functions are highly dependent on the composition and concentration of the soil solution, in addition to their dependence on soil water content, 0. For any given 0, both K(0) and D(0) decrease as either soil solution concentration decreases or the sodium fraction in the soil solution increases. The negative effect of a combination of high Na-to-Ca ratio and low soil solution concentration on K(ff) is directly related to the degree of water saturation of the soil. Low values of 0 can compensate for the negative effects of high Na-toCa ratio and low solution concentration.

Scientific Publication
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