Nourmahnad, N., Tabatabaei, S., Nouri Emamzade, M., dashtaki, G., Hoshmand, A. (2014). Determination of Water Retention Curve and van Genuchten Equation's Parameters in Hydrophilic and Heat-induced Hydrophobic Soils. , 27(4), 573-582. doi: 10.22092/ijsr.2014.126303
N. Nourmahnad; S. H. Tabatabaei; M. R. Nouri Emamzade; gorbani dashtaki; A. R. Hoshmand. "Determination of Water Retention Curve and van Genuchten Equation's Parameters in Hydrophilic and Heat-induced Hydrophobic Soils". , 27, 4, 2014, 573-582. doi: 10.22092/ijsr.2014.126303
Nourmahnad, N., Tabatabaei, S., Nouri Emamzade, M., dashtaki, G., Hoshmand, A. (2014). 'Determination of Water Retention Curve and van Genuchten Equation's Parameters in Hydrophilic and Heat-induced Hydrophobic Soils', , 27(4), pp. 573-582. doi: 10.22092/ijsr.2014.126303
Nourmahnad, N., Tabatabaei, S., Nouri Emamzade, M., dashtaki, G., Hoshmand, A. Determination of Water Retention Curve and van Genuchten Equation's Parameters in Hydrophilic and Heat-induced Hydrophobic Soils. , 2014; 27(4): 573-582. doi: 10.22092/ijsr.2014.126303

Determination of Water Retention Curve and van Genuchten Equation's Parameters in Hydrophilic and Heat-induced Hydrophobic Soils

پژوهش های خاک
Volume 27, Issue 4, March 2013, Pages 573-582    PDF (497.8 K)
Document Type: Research Paper
DOI: 10.22092/ijsr.2014.126303
Authors
N. Nourmahnad* 1; S. H. Tabatabaei2; M. R. Nouri Emamzade3; gorbani dashtaki4; A. R. Hoshmand5
1Ph.D. Student, Department of Water Engineering, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran
2Associate Professor, Department of Water Engineering, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran
3Assistant Professor, Department of Water Engineering, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran
4Assistant Professor, Department of Soil Science, Faculty of Agriculture, Shahrekord University, Shahrekord
5Assistant Professor, Faculty of Water Engineering, University of Shahid Chamran, Ahvaz, Iran
Abstract
Heating affects soil physical and chemical properties and sometimes causes soil water repellency. In order to investigate heating effect on water retention curve, an organic soil was heated in a muffle furnace preheated at 100 (T100), 200 (T200), 300 (T300), 400 (T400) and 500 °C (T500). Hence, the soil was exposed to five heating treatments in three replications, in a completely randomized design. Water repellency was determined by using water drop penetration time method and aqueous ethanol method. Water retention curve of the treatments was determined by means of sand box and pressure plate. The van Genuchten equation's parameters were obtained by minimizing mean square procedure and using RETC software. Then, heating effects were determined using SAS8 and LSD model. Some properties of water retention curve in heated and unheated soils were measured. The results showed that the original soil had low water repellency, while, at 300 °C, strong water repellency appeared, but disappeared by increasing the temperature. Van Genuchten equation's parameters changed by increasing temperature and water repellency. The hydrophobic soils had low saturation water content compared to the other treatments with similar texture. T500 had the least saturation water content, probably because higher temperature decreased organic matter and increased sand and ash content. The value of α in hydrophobic soil was lower than other treatments with the same texture, but the “n” parameter in hydrophobic soils was higher than that in T100 and T200 treatments. Since this parameter is lower in heavy soils than light soils, it was low in T400 and T500 with sandy loam texture compared with the other treatments with loam texture. Water content at field capacity and wilting point diminished by increasing temperature.
Keywords
Heating; Pressure plate; van Genuchten equation; Water repellency
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