Experimental study on water-wing characteristics induced by piers in ood drainage culverts

Setting piers is an eective 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 aect the operation of hydraulic structures. This present study deals with the waterwing caused by the obstruction of the pier placed in front of a ood drainage culvert. Based on the dimension analysis, the in uencing factors of water-wing were analyzed, the hydraulic characteristics were experimentally investigated, and nally 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 ow velocity and depth.