Sharif University of Technology Scientia Iranica 1026-3098 20 5 2013 10 01 Experimental Study on Water-wing characteristics induced by piers in Flood Drainage Culverts Experimental Study on Water-wing characteristics induced by piers in Flood Drainage Culverts 1320 1326 1509 EN Chen Sheng College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, P.R. China Zhang Jian College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, P.R. China Hu Ming College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, P.R. China Arash Hazrati College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, P.R. China Journal Article 2013 07 24 Setting piers is an effective way to overcome the limits of manufacture and operation of the gates for large span culverts or tunnels. However, the piers, if designed improperly, will bring about water-wing to strike the top and the side walls, and hence affect the operation of hydraulic structures. This present study deals with the water-wing caused by the obstruction of the pier placed in front of a flood drainage culvert. Based on the dimension analysis, the influencing factors of water-wing were analyzed, the hydraulic characteristics were experimentally investigated, and finally a kind of new piers was proposed. The results showed that, it is the initial height of piers that is the key factor, as well as the radius and inclination angle of piers, approached flow velocity and depth. https://scientiairanica.sharif.edu/article_1509_1cd3882394520876dc88d1472aa2a93f.pdf