Author(s): Hao Yuan; Qian Sun; Xidong Zhou; Chunxiu Pu; Tingting Guo
Linked Author(s):
Keywords: Flood-discharge atomization; Rainfall distribution; Splashing test; Nappe flow; Plunge pool
Abstract: 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 center point and measurement points. The rainfall intensity decreases along the longitudinal direction, 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. In addition, the rainfall intensity decreases overall as the elevation increases. Relationships between the maximum rainfall intensity and hydraulic factors are analyzed. The impingement velocity is the main hydraulic factor that affects maximum rainfall intensity.
Year: 2024