Document Type : Research Paper
Authors
1 Young Researchers and Elite Club, Marvdasht Branch, Islamic Azad University, Marvdasht.
2 Assistant Prof., Water Science and Engineering Department, University of Jiroft.
3 Associate Prof., Soil Science Department, University of Shiraz.
Abstract
Soil moisture characteristics curve has a great importance in soil and water researches related to irrigation and drainage, soil conservation and solute transport. Since the direct measurement of this characteristic of the soil is time-consuming and expensive, the estimation of soil moisture curve points by using pedotransfer functions and reliable soil properties can save cost and time. The aim of the present study was assessment and comparison of Ostovari-Beigi (2013) and Ghanbarian-Millán (2010) pedotransfer functions, both of which were derived from the same database (UNSODA), for estimating 8 points of soil moisture curve. For this purpose, data of 119 soil samples of Europe (HYPRES database) were used. Results revealed that functions of Ostovari-Beigi (2013) have a good and similarity performance with the function of Ghanbarian-Millán (2010) at low suctions. At high suctions and near the permanent wilting point, Ostovari-Beigi (2013) functions, which used the fractal dimension of soil texture as an independent variable input, had a higher performance than Ghanbarian-Millán (2010) functions. Also, at some suctions, both Ostovari-Beigi (2013) and Ghanbarian-Millán (2010) functions did not have appropriate performances for estimation of the soil moisture. Generally, it can be concluded that the performance of Ostovari-Beigi (2013) functions (with one input parameter, the fractal dimension) in predicting the retention curve points is similar to, and sometimes better, than the functions of Ghanbarian-Milan (2010) (with a large number of input variables).
Keywords
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