基于GNOME的长江口锚地溢油模拟

基于GNOME溢油模型模拟长江口外锚地发生溢油时的漂移轨迹与扩散情况,先利用FVCOM建立潮流场,并选用主导风作为常风场,一起输入GNOME溢油模型,以中质原油为油种,模拟了100 t溢油量下、一个潮周期内涨急、涨憩、落急、落憩4个时段发生溢油后4 d中的溢油轨迹和最终分布,通过计算1 d的溢油扩散面积及距离来讨论风向与流场共同作用下对油膜漂移扩散的影响。结果表明:无风情形下溢油向西南方向扩散;西北风情形下的溢油均呈螺旋状向南扩散;东南风情形下的溢油除涨急时向北漂移外,其余均在杭州湾近上海海域振荡,部分吸附于上海岸线;1 d中西北风情形下的油膜质心漂移距离大于东南风下,溢油扩散面积上则相反。

Simulation of oil spill in anchorage out of Yangtze River Estuary based on GNOME

Based on Gnome model , the trajectory and diffusion of oil released from anchorage out of Yangtze River Estuary were simulated. Tidal current filed modeled by FVCOM and dominant wind were used to drive GNOME model. The 40t medium crude was chosen to simulate the oil slick drifting track and diffusion area at flood fast tide, transition from flood slack to ebb tide, ebb fast tide and transition from ebb slack to flood tide within 4 d and the final distribution was given. The results show: oil slick drifts spirally toward southwest in 4 d under no wind; oil slick drifts spirally toward south in 4 d under northwest wind; oil slick drifts spirally in Hangzhou Bay(some stuck to the shore of Shanghai) under southeast wind ,specially, oil slick drifts northward when oil spill happened at flood fast tide; the drift distance under northwest wind is farther than under southeast wind while the diffusion area under northwest wind is smaller than under southeast wind.