Analysis on Sensitivity of Parameters in Numerical Simulation of Dissolved Gas Supersaturated in Spillway Discharges

摘要

High concentration of total dissolved gas (TDG) in the tailrace of high dam may induce gas bubbledisease to the fish for lethal effect. Thus, the distribution of the TDG concentration in the plungepool and immediately in the downstream of dam becomes critical. In order to proves to be effectiveand convenient, but the determination of the model parameter relies on field observed data and thecalibration of the parameter is time-consuming. In this paper, the predictive relationship of the parameter inthe TDG transport equation with a source term is developed. Observed field data from six spillways inChina were used to fit the source parameter that the predictive relationship needed. Theinclusion in the predictive relationship will allow for the estimation of the source parameter representingthe mass transfer between bubble/water interfaces and may give an insight into the mitigation of highTDG concentration downstream of spillways.