平潭竹屿湾水交换能力和溢油风险数值模拟

应用非结构网格有限体积海洋模型对平潭竹屿湾水交换能力和溢油扩散开展了数值模拟。水交换能力计算表明,竹屿湾大部分水域水体半交换时间小于1.0 d,平均滞留时间约3.0 d左右,水体冲洗时间为15.0 d,水交换能力较强。48 h溢油扩散计算结果表明,油粒子扫海范围及运动路径与油粒子的释放时刻及风的作用紧密相关。静风条件下,溢油运动主要受当地潮流影响,呈南-北往复运动。不利风作用下,竹屿水道的溢油可以扩散至平潭坛南湾、平潭草屿岛、塘屿岛及高山湾等海域,最远可到南日岛西北海域。

Numerical simulation of water exchange and oil spill risk in Zhuyu Bay, Pingtan

An unstructured mesh finite volume oceanic model is used to simulate the water exchange capacity and oil spill in Zhuyu Bay of Pingtan. The results show that the half life time of most waters in Zhuyu Bay is less than 1 day. The average residence time is about 3 days and the water body flushing time is about 15 days. It shows that the water exchange capacity in the bay is strong. The spatial distributions of particle trajectories affer oil spill over 48 h show that the oil particle sweeping range and trajectories are closely related to the oil release time and the action of wind. Under calm wind conditions, the oil spill route is mainly affected by local tidal currents showing a south north reciprocating motion. Under the adverse wind conditions, the oil particles can spread to Tannan Bay, Caoyu Island, Tangyu Island and Gaoshan Bay of Pingtan and as far as to the northwest of Nanri Island.