نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار دانشگاه آزاد اسلامی کرمان
2 کارشناس ارشد آبیاری و زهکشی دانشگاه آزاد اسلامی کرمان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Unsaturated hydraulic conductivity is one of the basic properties of soil that governs the water movement in the field. As application of any of the various available methods in the field deemed impracticable due to its difficulty of implication and high costs, we resorted to a laboratory method and modeling to develop a method, which may be easily used in determining this important parameter. Saturated hydraulic conductivity was determined by the falling head method. Hydrometry method was used for grain size distribution; pH, EC, and contents of mineral carbonate and gypsum were also determined using the approved methods. Unsaturated hydraulic conductivity (Ku) was estimated using the discharge equation in a unit area, the Darcy's law, neural network, and the RETC, SPSS, Curve Expert, and Excel software. It was observed that the Power subroutine of the SPSS, with the maximum coefficient of determination and the highest correlation coefficient, and the minimum RMSE presents the best model.
کلیدواژهها [English]
Harvey, D.J. and Yeh, J., 1990, Effective
Unsaturated Hydraulic Conductivity of
Layered Sands, Water Resources
Research, Vol 26, No6, 1271-1279.
the determination of unsaturated hydraulic
conductivity from soil moisture profiles
and water retention curves, Soil Science,
156, 386-395.
Romberger, J.S. and Papendick, R.I.,
1986, Estimating generalized soil- water
characteristics from texture, Soil Science
Society American Journal, 50, 1031-1036.
form equation for predicting the hydraulic
conductivity of unsaturated Soil Science
Society American Journal, 44, 892-898.
Hennings, V. and Muller, U. and
Wessolek, G. and Plagge, R. 2001,
Evaluation of pedotransfer functions for
unsaturateal soil hydraulic conductivity
using an independent data set, Geoderma,
102, 275-297.
and Rawls, W.J., 2001, Pedotransfer
functions: bridging the gap between
available basic soil data and missing soil
hydraulic characteristics, Journal of
Hydrology, 251, 123-150.
1994, New models for unsaturated soil
hydraulic properties, Soil Science, 163,
425-435.
G.R. and Miyazaki, T., 2001, Predicting
unsaturated hydraulic conductivity of soil
based on some basic soil properties, Soil
& Tillage Research, 59, 143-154.
)
