عنوان مقاله [English]
The quantity and quality of produced drainage on saline land that needs initial leaching; from starting Irrigation and drainage network up to before reaching balance conditions is constantly changing. The time to reach balance conditions in areas with shallow saline groundwater may take several years. In such cases, knowledge of the quantity and quality of produced drainage in order to manage and control is necessary. Therefore, in this study the performance of a drainage system in non-steady conditions using system dynamics approach is completely modeling and after validity of the model results with field data and verification of the quantity and quality of drainage, management actions that can be applied on such drainage, were modeled. With run of the above model for agro-industrial farms of sugarcane Amirkabir unit, in order to management of Saline drainage these lands, combination of existing solutions such as mixed with irrigation water, using in downstream and cultivation of salt tolerant plants as used simultaneously and Saline drainage rate allocated to each of these methods was determined. The results showed that Salinity of drain water reaches balance condition for first eight years of operation. And the salinity is reduced from 35 to 4.5 dS/m. However, halophytes can be planted and irrigated directly by saline drainage water, after 6 years. Drainage discharge to the river is reduced from 82.7 to 27.7 percent, during the ten years simulated. Finally the recipe for managing saline drainage of above unit lands was presented.