ندا شیخ رضازاده نیکو - دانشجوی دکتری علوم مهندسی آب، سازه های آبی دانشگاه فردوسی مشهد، مشهد، ایران
محمد جواد منعم - دانشیار گروه مهندسی سازه های آبی دانشگاه تربیت مدرس، تهران، ایران
خداداد صفوی - کارشناس ارشد مهندسی عمران آب موسسه تحقیقات آب تهران، تهران، ایران

Pivot weirs are used in irrigation networks in order to regulate water surface elevation and flow measurements. Few studies have been reported on head-discharge relation of mentioned structure under submerged flow condition. In this study, one equation based on energy and critical depth equations is proposed to determine discharge equation. To determine the coefficients of these equations, measured data in an experimental model on the three pivot weirs with different three side contractions compiled with the USBR (United States Bureau of Reclamation) experimental data of data, the discharge coefficient was estimated for and submerged flow condition‎. Comparisons of experimental results with presented relation indicatest‎he range of error for the proposed equation was less than ±۲۰%‎, where the submergence factor was between ۰.۲ and ۰.۹‎, which in comparison to Brater and King’ relation with ±۴۰% error has a good accuracy.

آنالیز ابعادی, اندازه گیری دبی جریان, ضریب دبی مدل آزمایشگاهی, معادله تحلیلی