浙江金塘港海域溢油扩散数值模拟研究

Study on oil spill modeling of Jintang harbor in Zhoushan sea

本文针对浙江舟山澳洲活牛进境加工项目可能的溢油事故,预测分析溢油油膜的扩散漂移对周边海域的影响。首先采用MIKE21 HD模块建立了舟山海域二维潮位模型,在利用实测水文数据对模型验证的基础上,通过MIKE OS模块模拟溢油油膜的扩展、输移和风化过程,计算了在航道和靠泊平台发生溢油时不同工况下油膜的扩散输移过程。对比分析计算结果表明:油膜的扩散输移与油品泄漏地点、溢油发生时刻、流场特征以及风速风向相关;静风时,油膜运动由涨、落潮流主导,随水流流动扩散输移,24 h最大扫海面积为195.74 km^(2);夏季主导风向SE向风条件下,向杭州湾开敞水域输移,不受岸线和岛屿的阻挡,扩散范围更广,24 h最大扫海面积为209.71 km^(2);不利风向NW向风条件下,油膜在金塘岛南侧岸线和周边岛屿沿岸堆积,24 h最大扫海面积为131.99 km^(2)。

This paper predicts and analyzes the impact of spilled oil slick on the surrounding sea area base on the possible oil spill accident of the Australian live cows processing program in Zhoushan,Zhejiang.A two-dimensional tidal current model of Zhoushan sea area is established using MIKE21 HD module and verified by the measured hydrological data.On this basis,MIKE OS module is used to simulate the spreading,transfer,and weathering processes of the oil slick.Such processes are calculated under different conditions for the oil spill that happened in the channel and the berthing platform.The results show that spreading and transfer of oil slick are related to leakage locations,spill time,current field,wind speed and wind direction.Under the condition of no wind,the movement of oil slick is dominated by flood and ebb,with a maximum sweeping area of 195.74 km^(2) within 24 hours.Under the condition of prevailing wind direction of SE in summer,oil slick transfers to the open waters of Hangzhou bay.Its spreading range is wider because it is not blocked by coastlines and islands.The maximum sweeping area reaches 209.71 km^(2) within 24 hours.Under the other condition with unfavorable wind direction of NW,the oil slick piles up along the coastline of the south of Jintang island and surrounding islands with a maximum sweeping area of 131.99 km^(2) within 24 hours.