DERIVATION OF THE RETENTION CURVE PARAMETERS USING PEDOTRANSFER FUNCTIONS

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GHORBANI DASHTAKI SH.; HOMAEI M.

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Journal: JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH Year:2002 | Volume:3 | Issue:12 Page(s): 1-16

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Title

DERIVATION OF THE RETENTION CURVE PARAMETERS USING PEDOTRANSFER FUNCTIONS

Author(s)

GHORBANI DASHTAKI SH. | HOMAEI M. | Issue Writer Certificate

Keywords

PEDOTRANSFER FUNCTIONSQ4

RETENTION CURVEQ4

HYDRAULIC PROPERTIESQ4

UNSATURATED SOILQ4

VAN GENUCHTEN-MUALEM EQUATIONQ4

Abstract

Parametric description of the soil water RETENTION CURVE is crucial for many applications and mode ling water movement and solute transport in the unsaturated zone. Due to high spatial and temporal variability of this hydraulic characteristic, its direct measurement requires a large numbers of samples. The direct measurements, in the other hand, is rather time consuming and costly. Thus, the indirect methods such as PEDOTRANSFER FUNCTIONS (PTFs), as an alternative, are increasingly employed for practical and modeling purposes. The objective of this study was to derive and verify some PEDOTRANSFER FUNCTIONS based on the geometric soil particle size variables to estimate the van Genuchten parameters. Consequently, the geometric mean and geometric standard deviation of particle diameters as input parameters were used to describe the pore-size distribution in PTFs. Therefore, 34 soil samples were randomly collected from Karaj area. The particle-size distributions and in situ bulk densities were determined with the hydrometery and core methods, respectively. The soil water RETENTION CURVEs for the entire range of interest were obtained using the pressure plate apparatus. The so-called easily obtainable variables were separated into two groups: (i) particle size distribution and bulk density, (ii) bulk density, geometric mean diameter and the geometric standard deviation of soil particle diameters. The parametric PTFs of these two group variables were developed, using the stepwise regression method. The derived PEDOTRANSFER FUNCTIONS were also verified and compared with some other collected data. The results indicated that the second group of variables can better predict the van Genuchten parameters. The coefficient of determination of 94 and 69 percents were obtained for the saturation and a, respectively.

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APA: Copy

GHORBANI DASHTAKI, SH., & HOMAEI, M.. (2002). DERIVATION OF THE RETENTION CURVE PARAMETERS USING PEDOTRANSFER FUNCTIONS. JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH, 3(12), 1-16. SID. https://sid.ir/paper/28038/en

Vancouver: Copy

GHORBANI DASHTAKI SH., HOMAEI M.. DERIVATION OF THE RETENTION CURVE PARAMETERS USING PEDOTRANSFER FUNCTIONS. JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH[Internet]. 2002;3(12):1-16. Available from: https://sid.ir/paper/28038/en

IEEE: Copy

SH. GHORBANI DASHTAKI, and M. HOMAEI, “DERIVATION OF THE RETENTION CURVE PARAMETERS USING PEDOTRANSFER FUNCTIONS,” JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH, vol. 3, no. 12, pp. 1–16, 2002, [Online]. Available: https://sid.ir/paper/28038/en

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