SIMULATION AND ESTIMATION OF DRAINAGE WATER FROM UNDERGROUND DRAINS, RUNOFF AND ROOT WATER UPTAKE IN CULTIVATING WHEAT ON FIELD-SCALE USING THE HYDRUS-1D MODELArash Tafteh, Naser Davatgar and Niazali Ebrahimipak
Considering the environmental problems caused by drainage water from drains, correct management of drainage water produced in growing field crops is of great significance. Therefore, use of models that are capable of reliably performing this simulation is f interest. The HYDRUS-1D model was designed to simulate one-dimensional water movement in porous media. It is able to receive information about the depth and manner of soil stratification, physical and chemical properties of each separate layer of soil, type of plant, initial soil moisture, amount of precipitation and irrigation water, type of root distribution, growing season, the quantity of applied fertilizer at any given time and the desired concentration in irrigation water. In this research, the information from cultivating wheat in the Kosar Pilot was evaluated in three experimental fields under different irrigation management systems. Results indicated this model simulated the existing conditions with acceptable accuracy and that it could be used to study various management scenarios and evaluate methods of water management in fields.
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