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Information Journal Paper

Title

DEVELOPING A MODEL FOR ESTIMATING UNSATURATED SOIL HYDRAULIC CONDUCTIVITY AND ITS SENSITIVITY TO PORE CONNECTIVITY FACTOR

Pages

  51-63

Abstract

 Unsaturated soil hydraulic conductivity is an important soil hydraulic property that is widely used in the studies of water and solute transport in soils. However, its direct measurement is time consuming and expensive. In order to study pore connectivity factor (l) in the BURDINE-BROOKS-COREY MODEL (BBC), 59 soil samples from the GRIZZLY database were used in a sensitity avalysis to determine sensitive parameters of this model. To study pore connectivity factor, its different values e.g., 3, 2, 1, 0.5, 0, -0.5, -1 and results of sensitivity analysis showed that BBC model was more sensitive to the saturated water content and pore size distribution index than to pore connectivity factor and saturated hydraulic conductivity. The statistical parameters, e.g., sum of absolute error (SAE), root mean square error (RMSE), Akaike’s information criterion (AIC) and concordance correlation coefficient (rc) calculated in the estimation of unsaturated hydraulic conductivity indicated that the BBC model error with l=2 is was less than the other values. The results also showed that pore connectivity factor was linearly correlated with the power of BBC model with goodness of fit R2=0.96. Based on this approach, pore connectivity factor was removed from BBC model and a new empirical equation was developed to estimate unsaturated hydraulic conductivity. This model was verified using 33 samples of the UNSODA database. The results showed that the developed empirical equation estimated unsaturated hydraulic conductivity better than BBC model, in which pore connectivity factor was assumed to be equal to 2.

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    APA: Copy

    GHANBARIAN ALAVIJEH, B., & ABBASI, F.. (2010). DEVELOPING A MODEL FOR ESTIMATING UNSATURATED SOIL HYDRAULIC CONDUCTIVITY AND ITS SENSITIVITY TO PORE CONNECTIVITY FACTOR. IRANIAN JOURNAL OF WATER RESEARCH IN AGRICULTURE (FORMERLY SOIL AND WATER SCIENCES), 24(1), 51-63. SID. https://sid.ir/paper/196658/en

    Vancouver: Copy

    GHANBARIAN ALAVIJEH B., ABBASI F.. DEVELOPING A MODEL FOR ESTIMATING UNSATURATED SOIL HYDRAULIC CONDUCTIVITY AND ITS SENSITIVITY TO PORE CONNECTIVITY FACTOR. IRANIAN JOURNAL OF WATER RESEARCH IN AGRICULTURE (FORMERLY SOIL AND WATER SCIENCES)[Internet]. 2010;24(1):51-63. Available from: https://sid.ir/paper/196658/en

    IEEE: Copy

    B. GHANBARIAN ALAVIJEH, and F. ABBASI, “DEVELOPING A MODEL FOR ESTIMATING UNSATURATED SOIL HYDRAULIC CONDUCTIVITY AND ITS SENSITIVITY TO PORE CONNECTIVITY FACTOR,” IRANIAN JOURNAL OF WATER RESEARCH IN AGRICULTURE (FORMERLY SOIL AND WATER SCIENCES), vol. 24, no. 1, pp. 51–63, 2010, [Online]. Available: https://sid.ir/paper/196658/en

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