基于EFDC模型的靖江河道多码头开发段溢油事故综合污染风险分析

Comprehensive pollution risk analysis of oil spill accidents in Jingjiang multi-wharf development section based on EFDC model

基于环境流体动力学模型EFDC模拟了长江靖江开发段6个码头溢油事故下油膜漂移路径,提出了溢油污染风险评估方法,计算了多码头溢油事故的污染风险指数分布及其对保护区的综合污染风险指数。结果表明:码头位置和周围流场影响油膜的漂移路径;急流区溢油事故产生的油膜峰值迁移速度快,影响距离长,而缓流区溢油事故产生的油膜聚集程度高,影响时间长;多码头溢油事故产生的污染风险主要分布在各油膜路径的叠加区域,在开发段中部至下游末端形成强等级污染风险带,综合污染风险指数约为1.6;风险带主要影响W1保护区,应在高风险区域提前采取应急防范措施。

Based on the environmental fluid dynamics code(EFDC)model,the oil film drift paths under the oil spill accidents at six wharfs in Jingjiang development section of the Yangtze River were simulated.A method for oil spill pollution risk assessment was developed,and the pollution risk index distributions of multi-wharf oil spill incidents and the comprehensive pollution risk index for the protected area were calculated.The results indicate that the location of the wharfs and the surrounding flow field significantly affect the drift paths of oil film.The oil film caused by oil spill accidents in a rapid flow area exhibits a fast peak migration speed and a large impact distance,while the oil film caused by spill accidents in a slow flow area demonstrates significant aggregation and a prolonged impact duration.Pollution risks induced by multi-wharf oil spill incidents are mainly distributed in overlapping areas of oil film paths,and a high pollution risk zone forms from the middle to the end of the downstream of the development section,with a comprehensive pollution risk index of approximately 1.6.The risk zone mainly affects the W1 protected area,and emergency prevention measures should be taken in advance in high risk areas.