@article { author = {seyedjavad, minasadat and Naeeni, Seyedtaghi and Sanei, Mojtaba}, title = {Experimental Study of Discharge Coefficient and Flow Streamlines in a Trapezoidal Piano Key Side Weir}, journal = {Iranian Journal of Soil and Water Research}, volume = {50}, number = {9}, pages = {2261-2273}, year = {2020}, publisher = {University of Tehran}, issn = {2008-479X}, eissn = {2423-7833}, doi = {10.22059/ijswr.2019.278429.668154}, abstract = {The main application of spillway in rivers and dams reservoirs is control and diversion of flood and protection of their related structures. In this research, a laboratory study was performed to test 16 trapezoid piano key A type weir models with different pillars 10, 15 and 20 cm in a canal with 10 meters length, 0.6 m width and 0.6 m height. The proposed weirs were placed on the main canal wall with two arrangements. The results showed that the maximum overflow rate coefficient was corresponded to weirs with p=15cm in both arranments (1 and 2) and the dimentionless ratio of 0.4 0.2 0.4 and also to weir with dimentionless ratio of 0.5 H/P> 2/0 و همچنین در سرریز با نسبت بی‌بعد 5/0 < H/P و cm 20=p می‌باشند. درنهایت سرریز کلید پیانویی ذوزنقه‌ای با cm 15 p= و سرریز با cm 50 B= مناسب‌ترین رژیم جریان را از خود عبور می‌دهد.}, keywords_fa = {ضریب دبی عبوری سرریز کلید پیانوئی,سرریز جانبی,خطوط جریان}, url = {https://ijswr.ut.ac.ir/article_71192.html}, eprint = {https://ijswr.ut.ac.ir/article_71192_6bb027dcb0da339b875fbfa7f776f990.pdf} }