感潮河网溢油归宿的数值模拟研究

Numerical simulation of fate of oil spill in tidal river-network

基于拉格朗日油粒子模型、溢油风化模型以及三维水动力、泥沙和吸附质模型构建了溢油双层数学模型.模型不仅能够模拟油膜的运动轨迹、岸边吸附与冲刷、油品性质变化过程,而且通过耦合泥沙吸附及沉积动力学过程,能够更加客观地模拟溢油从水体向底泥环境的迁移过程,更全面地反映溢油在环境中的归宿.此外,本文以假设溢油事故为背景,模拟和分析了洪、枯季节条件下珠江广州段溢油事故对河网陆地边界、河网水质及底泥环境的影响.

We developeda double - layer oil spill model based upon Lagrangian particle tracking, oil spill emulsion and 3D hydrodynamic, sediment transport and adsorption models. The model can simulate movement of oil slicks, land adhesion and re - suspension, and oil property changes. Coupled with suspended sediment adsorption / deposition processes, it can also simulate the transport of oil from water column into sediment bed so as to calculate the complete fate of oil spills more comprehensively. Based on hypothetic oil spill accidents, two spill scenarios under dry and flood seasons in Guangzhou section of the Pearl River were simulated to evaluate the influence of an accident upon river shorelines, water quality and sediment bed.