深海环境中溢油输移扩散的初步数值模拟

摘要

通过对溢油在深海环境中的输移过程及行为特点的分析,初步建立基于拉格朗日积分法的深海溢油模型.该模型除了能够模拟油气混合物在真实深海环境中的共同输移与分离输移扩散过程,还考虑了石油溶解、气体溶解、天然气水合物形成与分解等行为变化对溢油运动轨迹的影响.应用该模型初步数值模拟了一次实际深海溢油试验,结果表明溢油在水下的空间分布模拟结果与现场监测数据符合较好.%Based on the analysis of the behaviors of oil and gas spilled in deepwater environment, a deepwater oil spill model was developed based on the Lagrangian integral method. The model can simulate the transport and diffusion processes of oil and gas mixture in deepwater environment, including the oil and gas co-transport, gas separation from a bent oil/gas plume, etc. The behaviors of oil dissolution, gas dissolution, formation and decomposition of gas hydrate in deepwater environment and their effects on the movements of spilled oil were also taken into account in the model. The model was used to simulate an actual deepwater oil spill experiment in the North Sea, and the results showed that the simulated spatial distributions of spilled oil in water column were in good agreement with the field observed data.