生态清淤施工过程对巢湖水质影响的模拟

Simulation of the Effect of Ecological Desilting on Water Quality in Chaohu Lake

本研究以巢湖生态清淤为例,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描述生态清淤施工悬浮物的运动形态和排泥场尾水的影响。结果表明:生态清淤施工悬浮物扩散会给清淤区域内及周边约660 m范围的水体水质造成一定的影响。排泥场尾水排放口下游悬浮物最高浓度约4.8 mg/L,TN浓度最大增量约为0.164 mg/L,TP浓度最大增量约为0.004 mg/L。总体来说,尾水排放的SS、TN、TP对湖区的影响范围不大,其影响程度有限。

This study takes the ecological dredging of the Chaohu Lake as an example.Based on the hydrodynamic model,a two-dimensional steady flow and suspended solids diffusion mathematical model is used to describe the movement pattern of suspended solids and the influence of tail water in the ecological dredging construction.The results show that the diffusion of suspended solids during the construction period of ecological dredging will have a certain influence on the water quality in the dredging area and around 660m.At the downstream of the tail water outlet,the maximum concentration of suspended solids is about 4.8mg/L,the maximum increment of TN is about 0.164mg/L,and the maximum increment of TP is about 0.004mg/L.In general,the influence of SS,TN and TP discharged from the tail water on Chaohu Lake is limited.