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 andoperation of the gates for large span culverts or tunnels. however, the piers, if designedimproperly, will bring about water-wing to strike the top and the side walls, and henceaect the operation of hydraulic structures. this present study deals with the waterwingcaused by the obstruction of the pier placed in front of a ood drainage culvert.based on the dimension analysis, the inuencing factors of water-wing were analyzed, thehydraulic characteristics were experimentally investigated, and nally a kind of new pierswas 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.