前山河水力排污冲淤联合调度试验及效果分析

Collaborative Experiment of Qianshanhe River on Draining Pollution Water and Removing Silt by Utilizing Water Power and Experiment Effect Analysis

以排污冲淤为目的,改变原有水利工程设施的常规调度方式,通过水利工程设施的联合调度,大量引入西江磨刀门水道丰富和干净的水源,加大前山河河道内水流流速和流量,对河道进行排污冲淤,达到改善河道水质的目的。试验结果表明,试验排污效果好,水质得到明显改善;经过大流量冲刷,河床主槽加深,但在下游水闸关闭后,水流携带的泥沙在下游沉积,出口附近河床反而出现淤积;河道底质的变化与与河床的冲淤有很大关联,试验后,河道上游底泥受到冲刷,底质明显改善,下游出口段发生淤积,底质指标恶化。试验具有冲污效果好、见效快、投资省、运行成本低等优点。

The paper designs a diversion dilution experiment, trying to seek a simple way to diversion dilution and removing silt in a tideway of river. For the purpose of draining pollution water and removing silt, changing normal regulation of hydraulic structures to a collaborative means, the experiment was performed to diversion abundant clean water from Modaomen waterway in the Xijiang river to increase flow velocity and discharge in the Qianshanhe River to drain pollution water and remove silt in the River so as to improve the water quality of the rivers. The experiment results in good effect of draining pollution water and definitely water quality improvement. The main trough of riverbed was deepened by large discharge of the river while silted near the river mouth because the sand brought by current deposited near the mouth after closing the water gate. The variation of the silt quality relates much to silt, after experiment the silt quality was improved upriver where silt was removed and worsened in the deposited river mouth. This experiment proves to be quick effective and low-cost with good resuits.