日照市河道清淤工程对其水文情势及水质影响的研究

Study on the Influence of River Dredging Project on Hydrological Regime and Water Quality in Rizhao City

以日照市付疃河河道清淤为例,在水动力模型的基础上,采用平面二维恒定流和悬浮物扩散数学模型来研究河道清淤施工悬浮物的运动形态和对河道水文情势的影响,利用水动力模型模拟对比清淤前后污染物削减变化。结果表明:河道清淤施工悬浮物扩散会给清淤区域内及下游约900 m范围的水体水质造成一定影响,清淤后,河道水位变化为0.4 m之间。总体来说,本次河道清淤施工悬浮物对河道影响较小,工程结束后对河床造成一定的变化,但变化幅度较小,总体上改善了原有河道的水动力条件和河床断面,对下游河道自净能力有正效应。

Take the dredging of Futuan River as an example.based on the hydrodynamic model,a two-dimensional constant flow and suspended solids diffusion mathematical model is used to describe the movement pattern of suspended solids and its impact on the hydrological regime of the river during dredging construction.The results show that the diffusion of suspended solids during river dredging construction will have a certain impact on the water quality in the dredging area and about 900m downstream.After dredging,the river water level changes between 0.4 m.In general,the water quality of Tuan River is limited after the dredging of the river course,causing certain changes to the riverbed,but the range of changes is small.In general,the hydrodynamic conditions of the original river course and the riverbed section are improved,which has a positive effect on the downstream.