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

Document Type : Original Article



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.



    1 . علیزاده،امین، طراحی و برنامه ریزی سیستم های زهکشی کشاورزی، انتشارات دانشگاه فردوسی مشهد

    1. Bower, C.A., Ogata, O. and Tucker, J.M., 1969. Rootzone salt profiles and alfalfa growth as influenced by irrigation water salinity and leaching
    2. fraction. Agronomy Journal. Vol 61(5): 783-850.
    3. Butters, G.L., Jury, W.A. 1989. Field scale transport of Bromide in an unsaturated soil. 2:      Dispersion modeling. Water Resour. Res. 25: 1583-1589. 
    4. Butters, G.L., Jury, W.A., and Ernest, F.F. 1989. Field scale Transport of Bromide in an
    5. unsaturated soil. I: Experimental methodology and results. Water Resour. Res. 25: 1575-1581
    6. Droogers, P., H.R. Salemi and A. Mamanpoush. 2000. Exploring basin scale salinity problems using   Handbook no. 60, US Government Printing Office, Washington D.C
    7. Hanson. B.R., Grattan, S.R. and fulton, A., 1999. Agricultural salinity and drainage. California Univ. Davis,California.


    1. Van Schilf gaarde, J., Bernstein, L. Rhoades, J.D.and Rawlins, S.L., 1974. Irrigation management of salt control. J. Irrig. And Drainage Div., Proc. Amer. Soc. Civil Eng. (In press).
    2. Hoffman, G.J., and M. van Genuchten. 1983. Soil Properties and efficient water use: water                  management for control. In: H.M. Taylor et al., 1983, Limitations to efficient water use in cr
    3. Katterer, T., Schmied, B., Abbaspour, K.C., and Schulin, R. 2001. Single- and dual-porosity
    4. modeling of multiple tracer transport through soil columns: effect of initial moisture and
    5. mode of application. Europ. J. Soil Sci. 52: 25-36


    1. Jaynes, D.B., Logsdon, S.D., and Horton, R. 1995. Field method for measuring of Katterer, T., Schmied, B., Abbaspour, K.C., and Schulin, R. 2001. Single- and dual-porosity
    2. Mobile/immobile water content and solute transfer rate coefficient. Soil Sci. Soc. Am. J. 59: 352-356 mode of application. Europ. J. Soil Sci. 52: 25-36.
    3. Modeling of multiple tracer transport through soil columns: effect of initial moisture and production, ASA-CSSA-SSSA
    4. Simplified water accounting model: the example of Zayandeh Rud basin, Iran. Research Report 5, IWMI.
    5. Simunek, J., R. Kodesova, M. M. Grib and M.Th. van Genuhten, 1999. Estimating hysteresis in the soil water retention function from cone permeameter experiments. Water Resour. Res., 35(5):1329-1345
    6. Simunek, J. Van Genuchten, M.T and Senja, M 2006، The HYDRUS2-D Software Package for Simulating Tow-and Three   Dimensional Movement of Water, PC Progress, Prague, Czech Republi  
    7. US Salinity Laboratory Staff. 1954. Diagnosis and Improvement of saline and alkali soils. Agric.