Torabi Farsani, N., Ghahraman, B., Kashkuli, H., Hoseini, S. (2007). Measurement of Unsaturated Soil Hydraulic Conductivity and Comparison With Four Estimation Models. , 20(2), 283-294. doi: 10.22092/ijsr.2007.127216
N. Torabi Farsani; B. Ghahraman; H. A. Kashkuli; S. M. Hoseini. "Measurement of Unsaturated Soil Hydraulic Conductivity and Comparison With Four Estimation Models". , 20, 2, 2007, 283-294. doi: 10.22092/ijsr.2007.127216
Torabi Farsani, N., Ghahraman, B., Kashkuli, H., Hoseini, S. (2007). 'Measurement of Unsaturated Soil Hydraulic Conductivity and Comparison With Four Estimation Models', , 20(2), pp. 283-294. doi: 10.22092/ijsr.2007.127216
Torabi Farsani, N., Ghahraman, B., Kashkuli, H., Hoseini, S. Measurement of Unsaturated Soil Hydraulic Conductivity and Comparison With Four Estimation Models. , 2007; 20(2): 283-294. doi: 10.22092/ijsr.2007.127216

Measurement of Unsaturated Soil Hydraulic Conductivity and Comparison With Four Estimation Models

پژوهش های خاک
Volume 20, Issue 2, February 2007, Pages 283-294    PDF (363.86 K)
Document Type: Research Paper
DOI: 10.22092/ijsr.2007.127216
Authors
N. Torabi Farsani1; B. Ghahraman2; H. A. Kashkuli3; S. M. Hoseini* 4
1Former Graduate Student of Irrigation and Drainage, College of Agriculture, Ferdowsi University of Mashhad, Mashhad
2Associate Professor of Irrigation, College Agriculture, Ferdowsi University of Mashhad, Mashhad
3Professor of Irrigation, College Agriculture, Shahid Chamran University, Ahwaz
4Associate Professor, Civil Engineering Department, College of Engineering, Ferdowsi University of Mashhad, Mashhad
Abstract
Knowing soil hydraulic properties and their applications in soil water flow models play an important role on solving many water management issues. Unsaturated soil hydraulic conductivity (Ku), probably is considered the most important parameter in this category. Currently, there are numerous models for estimating Ku. In this study, Ku was measured for three sites with different soil textures using instantaneous profile (internal drainage) method of Hillel et al. (1972) for a 45-day period. Then, the performances of four Ku predicting models 1) Rawls and Brakensik (1989), 2) Vereeken et al. (1990), 3) Wosten (1997), and 4) Wosten et al. (1999) were investigated. Soil moisture was measured for 10 cm layers by using a calibrated TDR. A final depth of 60, 60, and 30 cm was adopted for the three sites under study. Corresponding suction for each moisture value was estimated through relevant soil moisture retention curve (SMRC) which was determined in the laboratory using undisturbed samples by sand table and pressure plate apparatus. A statistical test was conducted between measured and predicted values. The results showed that due to high sensitivity of Ku to saturated hydraulic conductivity (Ks), two models of Wosten (1997) and Rawls and Brakensik (1989) performed better than others when Ks is estimated by the same models.
Keywords
Internal drainage; Unsaturated flow; Prediction models of K; Performances of K models; Pedotransfer functions
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