EVALUATING SATURATED HYDRAULIC CONDUCTIVITY OF A SOIL IN LABORATORY INVESTIGATIONSAN EMPIRICAL MODEL
作者:
R. ARINGHIERI,
M. CAPURRO,
期刊:
Soil Science
(OVID Available online 1994)
卷期:
Volume 157,
issue 2
页码: 77-83
ISSN:0038-075X
年代: 1994
出版商: OVID
数据来源: OVID
摘要:
In this work, we investigated the change in the hydraulic conductivity of a sandyloam soil as a function of SAR and electrolyte concentration of the percolating solutions. High sodium adsorption ratios and low electrolyte concentrations caused a progressive reduction in the percolating rate, resulting in a non-linear relationship between effluent volume and time. In all these cases (nonsteady-state drainage) Darey's Law, which characterizes steady or stationary flow processes, does not apply. The relationships between effluent volume and time were then analyzed to find an empirical equation for predicting drainage from soil columns under saturated conditions. Characteristic parameters of the proposed model are the saturated hydraulic conductivity at timet= 0 (Ksat) and a rate constant that takes into account the progressive reduction in the initial hydraulic conductivity of the flow process. Validation of the model was found by applying it to montmorillonite-sand systems.
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