Author(s): Juping Huang, Wei Wang, Lele Wang, Ran Li, Jingjie Feng
Linked Author(s): Juping Huang
Keywords: Total dissolved gas, supersaturation, wind, dissipation coefficient
Abstract: Spillway discharges of hydroelectric projects may entrain a large amount of air into the plunge pool, which lead to supersaturation of total dissolved gas (TDG) and can cause lethal diseases for fish. Wind velocity is an important factor in the acceleration of the dissipation process of TDG. The quantitative relationship between the TDG dissipation process and wind velocity in flowing water has not been previously described. This paper performs a series of laboratory experiments in flowing water to investigate the effect of wind on the dissipation of supersaturated TDG. Moreover, this study numerically simulates TDG transport and dissipation to calibrate dissipation coefficients of supersaturated TDG using a two-dimensional k~? turbulence model. Based on the theoretical analysis, experimental data and simulated results, a quantitative relationship of the wind velocity and supersaturated TDG dissipation is established. The proposed correlation is a step forward in the research of dissipation process and can be used for prediction of TDG supersaturation downstream of high dams
Year: 2017