A Presentation of an Experimental Model for Unsaturated Hydraulic Conductivity under Affection of Physical Properties of Soil: A Case-by-Case Study of Baghin Plain in Kerman, Iran

The unsaturated hydraulic conductivity of soil is one of the most principal parameters in the study of water movement in the soil. As the field methods are hard and expensive, they are not desirable among the measurement methods. The principal of Laboratory styles is conducting experiment on the sample of soil from the case region. The aim of this research is to carry out the experiment and required calculation for estimating the most suitable relationship between the unsaturated hydraulic conductivity of soil and soil physical properties in the Baghin region of Kerman. The study also aims to determine the soil general condition with measuring their pH, electrical conductivity, the ratio of existing lime and gypsum in the soil. The next step was to estimate the unsaturated hydraulic conductivityof soil (K ) by discharging equations in the unit of area, u Darcy's law and RETC software and different models of that. By using neural network, SPSS and Curve Expert software and Excel the various models were fitted to the results of the Laboratory .The results showed that the power model from the SPSS software among the different models which were fitted to the results of research, had the maximum coefficient of determination and significant correlation coefficient (r) in the one percent level and the minimum amount of RMSE. Accordingly, this was presented as the best model.