渤海原油码头溢油漂移扩散的数值模拟

应用三维河口海岸海洋数值模式,加入油膜漂移扩散模块,研究渤海东海岸、仙人岛以北营口市以南的30万t级原油码头溢油事故发生后油膜面积、厚度的变化和漂移轨迹.计算结果表明,在静风情况下,落潮期间油膜随落潮流向西南方向漂移,面积扩大,厚度减小,港区未受油污的影响;涨潮期间油膜受北导堤的阻挡,部分油污留在港区.油膜轨迹随落潮流和涨潮流来回振荡,因扩散作用,在往复漂移过程中厚度变小,面积增大.风速风向的变化对油膜漂移轨迹和港区污染程度影响十分明显.

Numerical Simulation of the Drift and Diffusion of Oil Film at the Crude Oil Wharf in the Bohai Sea(Chinese)

Using a 3-D estuarine coastal and ocean numerical model with an oil film drift and diffusion module, the area, thickness and trajectory of the oil film was studied after an oil spill accident happened at the 300 thousand ton crude oil wharf in the Bohai Sea. The results show that in the case of no wind the oil film moves southwestward along with the tidal current, its area increases and thickness decreases, and the port is not polluted during ebb tide; a part of the oil film is blocked by the northern jetty, and stays in the port during flood tide. The oil film trajectory oscillates back and forth with the ebb and flood current, and its thickness decreases and area increases during the drift process with oscillation due to the diffusion. The change of wind speed and direction has a significantly influence on the oil film trajectory and pollution extent in the port.