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Paper Information

Journal:   JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)   2011 , Volume 18 , Number 1; Page(s) 199 To 213.
 
Paper: 

ESTIMATION OF SOIL-MOISTURE CHARACTERISTIC CURVE USING SOME METHODS FOR CALCULATING SCALING PARAMETER

 
 
Author(s):  FOOLADMAND H.R.*
 
* DEPT. OF IRRIGATION AND DRAINAGE, ISLAMIC AZAD UNIVERSITY, MARVDASHT BRANCH
 
Abstract: 

The relationship between soil moisture and soil suction is called soil moisture characteristic curve, and its measurement is time-consuming and expensive. Arya et al., (1999) have derived a model for estimating soil-moisture characteristic curve based on soil particle size distribution curve and bulk density, which contains scaling parameter  a. There are three methods for determining a which contain constant a, linear and logistic methods with available coefficients for some soil textures. In this study, 20 soil samples were selected from Fars province and three equations with exponential, logarithmic and power trend (Alfa-1 to Alfa-3) were derived for estimating a based on soil moisture content, and another equation with linear method (Alfa-4) was obtained. Then by using another 5 soil data sets in Fars and Boushehr provinces, the measured soil-moisture characteristic curves by combination of hanging column and pressure plate, were compared with estimated soil-moisture characteristic curve through eight different methods. These methods were: logistic, linear, Khoshnood Yazdi and Ghahraman (2004), Rezaei et al. (2005), and Alfa-1 to Alfa-4. The results indicated that the Alfa-4 method was appropraite for clay and silty clay loam textures, and the logistic method was appropriate for silty clay, loam and sandy loam textures.

 
Keyword(s): SOIL- MOISTURE CHARACTERISTIC CURVE, SCALING PARAMETER, LOGISTIC METHOD, LINEAR METHOD
 
References: 
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