象山港污染物漂移扩散规律研究

基于非结构网格有限体积法海岸和海洋模型(FVCOM)建立水动力数值模型,模型计算结果与实测结果吻合良好,较好地模拟了象山港海区水动力环境特点。在此基础上,建立了污染物输运模型,对象山港港内主要陆源入海污染源污染物输运扩散进行模拟和分析,总结了污染物输移扩散规律,即象山港顶部开敞海域,余流场相对较弱,潮流是污染物输移扩散的主动力,污染物扩散稀释能力强,污染物浓度低;中段过水区,受余环流和潮流的共同作用,污染物浓度稍高,低潮时水质较差;底部区域闭塞,进口处存在明显的涡旋对,污染物扩散稀释效率差,污染物浓度最高。

Numerical simulation of pollutant transport in Xiangshan bay

In this paper,a hydrodynamic model was built based on FVCOM.And the calculated results were in agreement with the measured data.Then a contaminant transport model was made,and the diffuse process of contaminants from major land-based outlets was simulated and discussed in Xiangshan harbor.Furthermore,the drift-diffusion rules of pollutant were given.The results show that the pollutant is at a low level in the wide area at Xiangshan bay＇ s entrance,where the residual current is relatively weaker,however the tidal current is the active force of pollutant transport,and pollutant density can be thinned at a high rate of speed.Due to joint effect of residual current and tidal current,the pollutant levels become a little higher,which are quite lower at a low tide in the middle of the bay.And the region at the bottom of Xiangshan harbor is close,and there obviously is a couple of eddies at the entrance of Tie port,where the tidal exchange is weak and the pollutant level is the highest.