نوع مقاله : مقاله پژوهشی
1 استادیار گروه مهندسی آب، دانشکدة کشاورزی، دانشگاه ارومیه، ارومیه، ایران
2 دانشجوی دکتری آبیاری و زهکشی، گروه مهندسی آب، دانشکدة کشاورزی، دانشگاه ارومیه
3 استاد مؤسسة تحقیقات فنی و مهندسی کشاورزی، کرج، ایران
عنوان مقاله [English]
Low irrigation application efficiency is the major problem confronted with in surface irrigation systems due to weak management and poor designs. The purpose followed in the present study was an improvement of border irrigation performance as based upon four variables of: inflow rate cut off time, slope as well as border length. To this end, 8 series of open-end downstream field experiment8al borders were considered. Calibration of infiltration parameters regarding borders were conducted as based on multilevel optimization method. The results indicated that the multilevel optimization method, for prediction of infiltration parameters in border irrigation, was an acceptable one. According to the multilevel optimization method, the mean relative error for the volume of run-off prediction was determined as 0.5% and the average Root Mean Square Error for advance and recession times predicted about 3.1 and 3.2 minutes, respectively. The performance of borders was optimized using application efficiency and distribution uniformity performance contours of the WinSRFR. Based on flow variables (inflow rate and cut off time), the average application efficiency could be promoted for about 12 % (with adequacy equal to 100%) for the 8 series of the field experiments as compared with the current situation. Results finally indicated that with a consideration of the geometric variables (slope and border length), and as well the flow rates as decision variables, the average application efficiency could be promoted by about 13.35 % as compared with an evaluation of the prevalent situation.