The 24th IAHR-APD Congress (24th IAHR-APD Congress)

As infrastructure for the development of hydropower resources, hydraulic projects have been constructed or are under construction all over the world Splashing is the main atomization source present during dissipation of energy from a nappe impinges upon a plunge pool. Deeper researcher understanding of splashing rainfall distribution characteristics may help to reduce the hazard of flood-discharge atomization. In this paper, a random splashing experiment is designed to investigate the effects of various hydraulic factors (unit discharge, impingement velocity, and water-cushion depth) on the spatial rainfall intensity distribution. The results demonstrate that the shape of the rainfall intensity contour is approximately elliptical in the horizontal plane. Maximum rainfall intensity was in the surrounding impingement region, and rainfall intensity decreased with an increase in the distance between the impingement centre point and measurement points. Splashing rainfall intensity increased with increases in impingement velocity and unit discharge, whereas the opposite was observed with an increase in plunge pool depth. The rainfall intensity decreases along the longitudinal direction and as the elevation increases and can be described by the gamma distribution. In the transverse direction, the rainfall intensity is large in the nappe impingement width range but is small on the two sides and can be described by the Gaussian distribution.