河道疏浚工程对污染物颗粒运移影响模拟

Simulation of the Influence of River Dredging Project on the Migration of Pollutant Particles

疏浚工程是中小型流域污染治理效率较为理想的一种方式,然而当前的技术手段很难对疏浚工程后区域水环境污染程度和河流流态等指标进行预测,为工程评价带来不便。因此,本文研究了一种二维流体力学有限元模型和拉格朗日粒子模块,建立了垂直平均水动力模型,探讨了两种河道疏浚方案(DS1和DS2)对污染物运移影响和河流流态的影响效果。结果表明:在没有河流流入和风的情况下,将排水口设置到主要疏浚河道中,能够明显缩小污染物的运移;工程实施后对离河流出口最近的A5节点影响最大,最大疏浚前后区域水深变化剧烈,加深了近6m,且流速明显减小。该研究成果可为相关工程提供参考。

Dredging project is the construction with ideal pollution control efficiency at present.However,the current technical means are difficult to predict the indicators such as regional water environmental pollution degree and river flow pattern after dredging project,which brings inconvenience to the project evaluation.Therefore,a two-dimensional finite element model of fluid dynamics and a Lagrangian particle module are studied in this paper,and a vertical mean hydrodynamic model is established to investigate the effects of two river dredging schemes(DS1 and DS2)on pollutant migration and river flow patterns.The results show that when there is no river inflow and wind,placing the drainage outlet in the main dredged river can significantly reduce the migration of pollutants.After the implementation of the project,it has the greatest impact on the A5 node which is closest to the outlet of the river.Before and after the maximum dredging,the water depth in the area changes dramatically,deepening by nearly 6m,and the velocity decreases obviously.The research results can provide reference for related projects.