Abstract
In this paper, the hydraulic characteristics of X-shape flaring gate pier and deflecting stilling basin united energy dissipater are analyzed experimentally on a physical model for large discharge, such as time average impact pressure, close-to-bed velocity in stilling basin and pressure fluctuations. The results show that for large discharge, the deflecting region is the main impact region and the max impact pressure decays with increased water discharge. The close-to-bed velocity decays fast in deflecting stilling basin along the flow direction and for discharge of 14143 m3/s and 17743 m3/s, the max root-mean-square of pressure fluctuation are 2.48 and 2.39 respectively. So the X-shape flaring gate pier and deflecting stilling basin united energy dissipater is a relatively good flood discharge structures combination, which provides strong references for the design of energy dissipater in hydraulic engineering.
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