The simulation of salts movement in soil using HYDRUS-2D Model

The accumulation and movement of salts in the soil and its modeling have been considered significantly in recent years. In this article، the simulation of movement of salts in soil using HYDRUS-2D Model for various leaching times has been performed and profiles of advancing salt movement on the dry and wet basins has been drawn and also the effect of initial moisture has been investigated. This model has a strong ability for simulation. Results of the above model show that the leaching repetition causes a quick movement of salts to bottom of the root zone. this movement had more speed on the dry basin in comparison with the wet. The applied conclusion of this article is that if the soil is dry before the irrigation; salts would be influenced by prefrential flows by Joint gaps resulting from contraction and expansion and therefore will smoothly transported. After a week of leaching، results show a faster salts movement on the dry basin causing by capillary forces and therefore the accumulation on the topsoil.