A two-dimensional hydrodynamic model that couples hydrology and water quality processes was developed to simulate the concentrations of PAH in water phase and sedimentation rates of PAHs in marine environment. The kinetic processes of the model included atmospheric exchange, transportation, deposition, etc. Taking Liaodong Bay as an example, the pollution level, spatial distribution of PAHs in sediments were analyzed and the transport, transformation and sedimentation processes of PAHs were simulated. The results show that PAHs concentrations in sediments are at a “moderate risk” level, and the distribution has a conspicuous spatial variation. According to the results of simulation, the PAHs in sediments are easily accumulated with weak hydrodynamic conditions. Thus, hydrodynamic is one of the important factors affecting the spatial distribution characteristics of PAHs in the sediments. The PAHs numerical calculation model established in this paper and its evaluation results have important research value for PAHs pollution prevention and control.

开发了耦合水文和水质过程的二维流体动力学模型，以模拟水相中 PAH 的浓度和海洋环境中 PAH 的沉降速率。该模型的动力学过程包括大气交换、迁移、沉积等。以辽东湾为例，分析了沉积物中PAHs的污染水平、空间分布，模拟了PAHs的迁移、转化和沉积过程。结果表明，沉积物中PAHs浓度处于“中等风险”水平，分布具有明显的空间变异性。模拟结果表明，沉积物中的多环芳烃在水动力条件较弱的情况下易富集。因此，水动力是影响沉积物中多环芳烃空间分布特征的重要因素之一。本文建立的PAHs数值计算模型及其评价结果对PAHs污染防治具有重要的研究价值。