大丰港匡围工程对潮流泥沙影响的模拟研究

Simulate the Impact of Reclamation Project on Tidal Current and Sediment in the Dafeng Port

建立了大丰港临近海域平面二维潮流泥沙数值模型,模拟计算了研究区域大小潮特征时刻的水沙空间分布特征。模型利用实测数据进行验证,计算结果与实测潮位、流速、流向及含沙量数据吻合良好。在模型验证良好的基础上,模拟围垦工程建设前后周围流场和悬沙场的变化。研究发现:围垦工程使得工程向海一侧流速减小。对于悬沙浓度,涨急时刻工程北部含沙量减小,落急时刻工程向海测含沙量增大。

A two-dimension flow and sediment numerical model is established nearby the Dafeng Port. The model is applied to stimulate the spatial distribution of flow and sediment during the maximum flood and maximum ebb tide. The simulation results are accordant well with measured water level, current speed, current direction and suspended sediment concentration. Furthermore, changes of flow and sediment field are detected by the model before and after the construction of reclamation project. It finds that current speed decreases at the seaward of the project. Suspended sediment concentration decreases in the north of project area during the maximum flood tide, while it increases at the seaward of the project during the maximum ebb tide.