Research on Chemical Leakage Based on Three-dimensional Soluble Contaminant Diffusion Model

The leakage and diffusion of pollutants are important issues affecting waters. This paper studies the diffusion of soluble pollutants in water. Based on the three-dimensional hydrodynamic model, a three-dimensional soluble pollutant diffusion model was established and validated. The validation results show that the discrete form of the transport equation used in this model must maintain monotonic properties, and otherwise the model calculation cannot converge. Taking Tianjin Nangang as a representative river section, the cognitive experiment on methanol leakage was carried out to predict the variation characteristics of chemical leakage and diffusion over time in Nangang. The model can be used for chemical leakage and diffusion prediction simulations of other pollutants, and can be used for calculations in runoff and tidal waters.