潮汐河道首尾闸控方式对其水环境的影响研究——以北界河为例

Study on the Effect of Sluice Regulation on the Water Environment of Tidal River: Based on the Case Study of Beijie River

北界河首尾与胶州湾相连,河道两端均受潮汐影响。为有效调控河道内的水动力,河道两端均规划建设闸门,这必将导致潮汐河道水体交换方式发生较大调整。为分析首尾闸门调度方式对北界河内水动力环境的影响,本文建立了二维水动力的对流、扩散数值模型,并对生态治理工程的两种工况下的流场和主要污染物浓度场分布进行了精细数值模拟。计算结果分析表明,通过合理利用潮汐涨落的差值,可以增强潮汐河道内水体与外海的水动力交换,充分提高水体纳污能力,以利于河道内生态环境的改善和达标景观水质的有效维持。

The both ends of Beijie river are connected with Jiaozhou Bay and affected by tides.In order to effectively control the hydrodynamics in the river,both ends of the river are planned to construct sluices,which will inevitably lead to a significant adjustment of the exchange of water in the tidal river.In order to analyze the influence of the two ends’sluices scheduling methods on the hydrodynamic environment of the Beijie river,a two-dimensional numerical hydrodynamic model coupled with convection-diffusion was set up,and applied the model to calculate the flow field and concentration field under the two cases condition after the implementation of the ecological treatment project.The analysis of the calculation results shows that through the rational use of the differences in tidal fluctuations,the hydrodynamic exchange between the water body and the open sea can be enhanced,and the water pollution-bearing capacity can be fully utilized to facilitate the improvement of the ecological environment and the effective maintenance of standard water quality in the river.