Effect of different Rosetta Predictive Model on Soil Hydraulic Properties Estimation Using HYDRUS-2D and Effect of Land use changing on their

Soil hydraulic conductivity and water retention curves are the most important factors that effect on water flow in soil. The aim of this study is investigation the effect of land use changing on soil hydraulic properties. Tension disk infiltrometer was used for measurement of in situ soil hydraulic properties. Infiltration experiments were conducted at 3 land uses (including range، Horticulture and Agriculture lands) in 5 tensions (including 0، 3، 6، 10، 18 cm H2O) and 3 replications for each land uses. Horticulture and Agriculture land use have been created of rang land use changing. Hydraulic conductivity and water retention curves were simulated by inverse method using Hydrus 2D software and 3 model of Rosetta، then compaired with observation data. Results showed، SSC+BD is the best model to predicting hydraulic conductivity curve in all 3 land use. Simulation of water retention curve showed، for all 3 models of Rosetta (including Textural class، SSC and SSC+BD)، GMER parameter was less than 1، for therefore، inverse method underestimated the water content. Statistical parameters amount showed، in range land-use textural class model، in horticulture land use SSC model and in agriculture land use SSC+BD model are the best models for simulation retention curve. RMSE and MAE amounts for mentioned land uses and models are 0. 055، 0. 048 (range land use)، 0. 046، 0. 03 (horticulture land use) and 0. 05، 0. 041 (agriculture land use) respectively.