大亚湾倾倒区海洋动力对疏浚物扩散的影响分析

本文利用对大亚湾海洋倾倒区在9个月倾倒期间的跟踪监测数据统计、分析其在接纳疏浚物倾倒期间悬浮物浓度的特征以及变化特点；通过相关系数的计算，分析海洋动力（波浪、海流）对疏浚物扩散的影响．结果显示：海区海洋动力较强，疏浚物扩散快速，因此，大量倾倒时，倾倒区悬浮物浓度并不大幅度上升；海域的波高与倾倒区悬浮物浓度存在显著正相关，即波浪是影响倾倒区浓度的主要因素；海流是疏浚物扩散的主要因子，其作用导致监测海区很少出现高悬浮物浓度．自然状态下，海水的运动状态和悬浮物浓度也在不断变化之中，因此，如何确定海域的悬浮物本底浓度是一个值得进一步探讨的问题．

Influence of ocean dynamic on the diffusion of dredged matter in Daya Bay dumping ground

With date of the suspended solid levels from Daya Bay marine dumping ground during monitoring,the characteristics of the suspended solids and the variations appeared in the activity of dumping are analyzed.In addition,by calculating correlation coefficient,the influence of the ocean dynamic(wave and current) on the diffusion of dredged matter is analyzed.It is concluded that the ocean dynamic in the survey area is strong and the dumping dredged matter diffuses quickly,and so,when a great quantity of dredged matter dumps,the suspended solids level in the dumping ground does not rise significantly;Wave height in the sea is closely related to suspended solids level,which means that wave has major influence on suspended solids level;Sea current is the main factor diffusing the dredged matter,there for,high suspended solids level never exists in the survey area.The sea condition changes forever,so how to identify the background level of the suspended solids may be a problem for further investigation.