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Paper Information

Journal:   JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH   Fall 2003 , Volume 4 , Number 16; Page(s) 1 To 12.
 
Paper: 

DEVIATION OF PEDO-TRANSFER FUNCTIONS TO ESTIMATE SATURATED HYDRAULIC CONDUCTIVITY

 
 
Author(s):  NAVABIAN M., LIAGHAT A.M., HOMAEI M.
 
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Abstract: 
Determination of saturated hydraulic conductivity Ks is needed for many studies in water movement and solute transport in the soil. Although some advances are made for direct measurements of ks, they are usually time consuming and costly. Some attempts have been made to indirectly predict the saturated hydraulic conductivity from the easily/readily obtainable parameters. The so-called pedo-transfer functions (PTF) proved to be a valuable tool to predict the Ks from the available soil data. The objective of this study was to derive some PTFs for different soil textures, requiring minimum input parameters. Consequently, 45 soil samples were taken and their Ks were directly measured, using the Geulph permeameter. The multilinear regression method was used to develop the pedo-transfer functions. The measurements were consisted of bulk density, particle density, field capacity, effective porosity (θe), particle size distributions, effective particle diameters, geometric mean diameter (dg) and geometric standard deviation of soil particles (δg). The normality and multi-colinearity of the parameters were tested by Minitab package. Three PTF functions were then derived, using different input parameters. The results indicated that accuracy of the derived PTFs can well predict (R2=0.73) the Ks from θe, dg and δg.
 
Keyword(s): PEDO-TRANSFER FUNCTIONS, SATURATED HYDRAULIC CONDUCTIVITY, SOLI HYDRAULIC CONDUCTIVITY.
 
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