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Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2003 , Volume 17 , Number 1; Page(s) 58 To 67.
 
Paper: 

ESTIMATION OF SOIL WATER RETENTION CURVE IN UNSATURATED ZONE BY INVERSE SOLUTION

 
 
Author(s):  NAGHAVI H., AFYUNI M., HAJABBASI M.A., ABEDI K G.
 
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Abstract: 
Determining water retention curve (WRC) is time consuming and expensive. Other soil parameters, like particle size distribution, organic carbon, bulk density and soil moisture in particular matric potentials can be used to estimate WRC. The objective of this study was to compare the abilities of van Genuchten and Brooks-Corey and two regression models (power and exponential) in WRC prediction with the coefficient of van Genuchten and Brooks-Corey estimated by using inverse solution method. A sandy loam and a clay loam soil incorporated with 60 Mgh^-1 cow manure were used. Three months after manure application, WRC was determined at 18 matric potentials (from 10 to 1500 kPa). The experimental data were used for van Genuchten and Brooks-Corey coefficients estimation using inverse solution (by RETC computer program), and also for the determination of the regressions coefficients. Two data set sizes were used in all models: I) water content at exactly 30 and 1500 kPa (2p), and II) water content at 18 water potential ranging from 10-1500 kPa(18p). Sum of square of deviations (SSD) and R, between measured and predicted water contents were compared for all the models just mentioned. Using 2p data set, regression equations (particularly exponential equation) and van Genuchten models produced similar results and were more accurate than Brooks-Corey model, especially for the SL soil. But when 18p data set was used, van Genuchten and Brooks-Corey models predicted WRC better than the regression models, especially for the CL soil.
 
Keyword(s): WATER RETENTION CURVE, INVERSE SOLUTION, VAN GENUCHTENM BROOKS AND COREY
 
References: 
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