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Calculation Of Soil Water Diffusivity Using A Model For Soil Moisture Profile Under Different Salinity Conditions | ||
| Journal of Engineering | ||
| Article 1, Volume 16, Issue 1, 2010, Pages 0-0 | ||
| Authors | ||
| Taghreed F. Younan; Mahdi I. Aoda | ||
| Abstract | ||
| A closed formed model modified from that of van Genuchten (1980) was used to fit the data of soil moisture profile ( θ vs. λ ) from which the slope dλ/dθ can be evaluated and then the soil water diffusivity [D(θ)] can be calculated. Diffusivity was calculated for three soil textures under different salinity conditions. The results showed that the model fitted the data very well with 1% confidence level (R2 > 0.93). D(θ) increased sharply with soil moisture for all soils but its values were lower when the texture got finer. At a certain sodium adsorption ratio (SAR), D(θ) increase with the increase of salt concentration (C) of the water infiltrating. Increasing SAR of water caused a decrease in D(θ) at any level of C. Same trends were obtained for the values of weighted mean diffusivity(D) . | ||
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