港口建设对水动力和水环境的综合影响

Comprehensive impact of port construction on hydrodynamic force and water environment

港口建设会造成一定的海洋环境影响,使得周边海域的水动力条件发生改变,对水环境质量也会产生影响。采用平面二维数值模型MIKE21FM,预测了港口建设后对水动力环境的影响。通过添加平面二维非恒定的对流-扩散模块,进行悬浮物扩散预测。废水排放预测采用物质输运方程,通过差分数值模拟方法模拟典型污染物浓度场,分析了废水排放对水质的影响。在围堰的掩护作用下,港区内涨落潮流速均有较大幅度的降低,各港池内的流速均在0.25 m/s以下。围填海疏浚影响主要集中于疏浚作业点周围300 m范围内,且废水排放各类污染物的最大扩散范围控制在400 m以内。结论可为港口区域规划、设计、建设提供参考和依据。

Port construction will cause a certain impact on the marine environment,which will change the hydrodynamic conditions of the surrounding waters,and also have an impact on the water environment. The plane two-dimensional numerical model MIKE21 FM is used to predict the impact of port construction on the hydrodynamic environment. By adding a two-dimensional unsteady convection diffusion module, the prediction of suspended solids diffusion is carried out. The material transport equation is used to predict the wastewater discharge,and the concentration field of typical pollutants is simulated by the difference numerical simulation method to analyze the impact of wastewater discharge on water quality. Under the cover of cofferdams, the fluctuating tidal current velocity in the port area is greatly reduced,and the velocity in each port basin is less than 0. 25 m/s. The influence of reclamation dredging is mainly concentrated in the range of 300 m around the dredging operation point,and the maximum diffusion range of various pollutants discharged by waste water is controlled within 400 m. The conclusion can provide reference and basis for the planning,design and construction of port area.