深海溢油输移扩散模型研究

在对深海中泄漏的油气混合物在海洋环境中的输运过程及行为变化的分析基础上,建立三维深海溢油输移扩散模型。该模型采用拉格朗日积分法模拟溢油在近区的水下浮射扩散过程,应用粒子追踪法模拟油滴在水下远区的对流扩散以及油膜在海面的漂移扩散过程,并考虑了油气分离输移、气体溶解、天然气水合物形成与分解等复杂行为对溢油运动轨迹的影响。应用该模型数值模拟了两个大型深海溢油现场试验,结果显示溢油在水下环境中的时空分布模拟结果与现场监测数据符合较好,表明该模型具有较高的准确性和实用性,能够为深海溢油的防治管理提供理论与技术支持。

A model for simulating the transport and behavior of oil and gas released from deepwater

Based on the analysis of the transport and behavior of oil and gas mixture released from deepwater oil spill accidents(e.g.,subsea oil well blowout,subsea oil pipeline leakage),a three-dimensional deepwater oil spill model(DOSM) was developed.The model uses the Lagrangian integral method to simulate the jet and plume of spilled oil in the near field,and uses the particle tracking method to simulate the advection and diffusion of oil droplets/slicks in the far field(i.e.,in the water column and on the water surface).The model can also simulate many important behaviors of oil and gas mixture that affect the movement of spilled oil,including the gas dissolution,gas hydrate formation and dissociation,possible gas separation from a bent plume,etc.The DOSM model was applied to simulate two large-scale deepwater oil spill field experiments conducted in Norway Sea,results show that the simulated temporal-spatial distributions of spilled oil in the water column are in good agreement with the field observed data,and this indicates that the model has good accuracy and applicability.Therefore the model can provide valuable theoretical and technical supports for deepwater oil spill prevention and response.