半封闭海湾的水交换数值模拟研究

基于采用不规则三角网格和有限体积方法的FVCOM模式,建立半封闭海湾-湛江湾附近海域的三维潮汐潮流数值模型,通过验证,结果与观测数据符合良好,并在此模型基础上对湛江湾的水交换状况进行了数值模拟,将湛江湾划分成3个区域,针对各区域进行了水交换能力研究,研究结果表明:由于湛江湾内不同区域的地形和地理位置变化较大,使得湛江湾内不同区域交换能力相差较大,其中,靠近湛江湾出口处交换能力最强,特呈岛以北海域交换能力最弱,交换时间与物质的初始浓度无关,与投放时刻和外源强迫密切相关,在治理湛江湾环境时,应分区进行,注意选择污染物排放时间和位置。

Numerical study on the water exchange of a semi-closed bay

Based on an unstructured grid, finite-volume coastal ocean model (FVCOM) and a dispersion model, water exchange ability of three area in Zhanjiang Bay was calculated, the result shows that the area 1 has the highest water exchange ability and the area 3, especially in the northwest part, has the lowest one. The exchange ability of surfer water is better than mid-waterand bottom water, one. Water exchange half-life time is independent of the initial concentration, but dependent on the initial time. The best time and place for discharging the waste water should be chosen for different areas.