摘要
为分析长江溢油事故中溢油输移扩散特征,在二维潮流模型的基础上,采用油粒子模型理论,建立适合溢油事故模拟的二维数值模型。针对水平扩散方式模拟油膜自身扩展存在的响应速度慢、溢油量未获响应的不足,提出了修正方案。在假定工况下,将模型应用于长江镇江—扬州段溢油事故模拟分析,结果表明模型能较好反映溢油在流场、风场、自身风化以及复杂地形条件影响下的平面迁移特征及溢油自身厚度变化特征,能合理预测溢油迁移对研究区中敏感对象的持续影响。研究方法可为长江溢油事故的应急处置及长江水环境保护提供有力的技术支持。
A 2 D numerical model of oil spill accident involving oil particle was built on the basis of 2 D tidal current model to investigate the spilled oil diffusion in the Yangtze River. Modifications were made to address the slow response of oil film expansion in horizontal diffusion mode and the insufficient response of oil spill. The model was applied to the simulation of oil spill accident in the reach between Zhenjiang and Yangzhou of the Yangtze River under assumed working conditions. Results demonstrated that the model could well reflect the characteristics of horizontal oil diffusion and the variation of oil spill thickness under the influences of flow field, wind field, self-weathering and complex terrain conditions. It could also accurately predict the persistent impact of oil spill diffusion on sensitive objects in the river channel. The research method offers powerful technical support for emergency treatment of oil spill accidents and water environment protection in the Yangtze River.
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