DERIVATION OF PEDO TRANSFER FUNCTIONS FOR PARAMETRIC ESTIMATION OF RETENTION CURVE

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KHODAVERDILOU H.; HOMAEI M.

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Journal: JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH Year:2002 | Volume:3 | Issue:10 Page(s): 35-46

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Information Journal Paper

Title

DERIVATION OF PEDO TRANSFER FUNCTIONS FOR PARAMETRIC ESTIMATION OF RETENTION CURVE

Author(s)

KHODAVERDILOU H. | HOMAEI M. | Issue Writer Certificate

Keywords

LOAMY SOILQ4

PEDO-TRANSFER FUNCTIONSQ4

RETENTION CURVEQ4

VAN GENUCHTEN PARAMETERSQ4

Abstract

Soil water RETENTION CURVE is needed for many applications in characterizing the unsaturated subsurface flow. Direct measurement of this curve, due to its high non-linearity, is time consuming and costly. In recent years, many attempts have been made to indirectly predict the RETENTION CURVE from readily/easily obtainable soil parameters. The so-called Pedo Transfer Functions (PTF) have been proven to be a valuable indirect tool to estimate the soil moisture characteristics with reasonable accuracy. The objective of this study was to derive PTFs to predict the parameters of the closed form equation of Van Genuchten (dependent variables) from particle size distribution, calcium carbonate, geometric mean diameter, geometric standard deviation and soil bulk density. Consequently, twenty seven LOAMY SOIL samples with different particle size distributions and calcium carbonate contents (independent variables) were used to establish the PTFs at tensions of 0, 10,33, 100, 300, 500 and 1500 kpa. The undisturbed samples were delivered to the laboratory to determine the particle size distribution, equivalent calcium carbonate and the RETENTION CURVE. These were obtained using hydrometery, calcimetery and pressure membrane methods, respectively. The bulk densities with paraffin method were determined in the field. The least square optimizer program RETC was used to obtain the VAN GENUCHTEN PARAMETERS. The best combination of independent variables for prediction of the dependent variables was selected by best subset regression command. The regression equations were obtained, using multiple linear regression method. The results indicated that the water retention at the range of interest could be predicted reasonably well with the derived PTFs. Comparison of RETENTION CURVEs with those measured and estimated provided a significant correlation (p=0.001). The point estimation of water retention at filed capacity and permanent wilting point provided an excellent correlation with measured values. These observations suggest the use of PTFs in calcareous soils when the equivalent calcium carbonate inserted as an input parameter in these functions.

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APA: Copy

KHODAVERDILOU, H., & HOMAEI, M.. (2002). DERIVATION OF PEDO TRANSFER FUNCTIONS FOR PARAMETRIC ESTIMATION OF RETENTION CURVE. JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH, 3(10), 35-46. SID. https://sid.ir/paper/28260/en

Vancouver: Copy

KHODAVERDILOU H., HOMAEI M.. DERIVATION OF PEDO TRANSFER FUNCTIONS FOR PARAMETRIC ESTIMATION OF RETENTION CURVE. JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH[Internet]. 2002;3(10):35-46. Available from: https://sid.ir/paper/28260/en

IEEE: Copy

H. KHODAVERDILOU, and M. HOMAEI, “DERIVATION OF PEDO TRANSFER FUNCTIONS FOR PARAMETRIC ESTIMATION OF RETENTION CURVE,” JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH, vol. 3, no. 10, pp. 35–46, 2002, [Online]. Available: https://sid.ir/paper/28260/en

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