乐清湾北港区溢油轨迹的分形模拟

Fractal simulation of oil spill trajectory in the northern port area of the Yueqing Bay

在验证良好的区域二维潮流数学模型基础上,建立采用"油粒子"方法的溢油模型,包含油膜的拓展、漂移和扩散等过程。模型采用四阶龙格库塔法求解粒子的平流过程,采用分数布朗运动产生non-Fickian扩散来模拟油膜拓延。在此基础上,对乐清湾北港区溢油风险进行预测模拟,分析在潮流和风不同作用情况下油膜的漂移轨迹和对周围敏感区的影响。

Based on a well-verified two-dimensional mathematical tidal current model,this paper proposed an oil spill model using ＂oil particle＂ method,with the combined processes of spreading,advection and turbulent diffusion.The model used fourth-order Runge-Kutta method for solving the particle advection process,and the non-Fickian diffusion generated by a fractional Brownian motion algorithm was used to simulate the extension of oil slick.The algorithm was implemented to predict oil spill trajectories in the northern port area of the Yueqing Bay in different circumstances of tidal current and wind,and the impact of oil slick on the areas concerned was analyzed.