北运河下游段水质水量联合调度试验研究

Experimental study on joint regulation of water quality and quantity in the lower reaches of the North canal

选择北运河干流下游榆林庄闸至杨洼闸段开展试验研究,通过水质水量联合调度,摸索不同下泄流量与水体水质COD、 NH3-N、 TN、 TP之间的关系,结果表明:在流量基本稳定情况下,主要污染物TN、 TP、 NH3-N质量浓度变化较小,而COD质量浓度变化较大,但无明显规律;随着流量增加, TN质量浓度持续缓慢减小, COD、 TP和NH3-N在底泥未扰动时,其质量浓度具有降低趋势,但流量增大到扰动底泥时,污染物浓度随之增加。该试验初步结果将为北运河科学调控水量以改善水环境提供技术支撑。

Through the joint regulation of water quality and water quantity, the relationships between different discharges and water qualities(COD, NH3-N, TN and TP) were explored by selecting the lower reaches of main stream of North canal from Yulinzhuang gate to Yangwa gate. The results showed that the mass concentrations of TN, TP and NH3-N changed little, while the concentration of COD changed greatly under the condition of steady flow rate, but there was no obvious rule. With the increase of flow rate, the mass concentration of TN decreased continuously and slowly. The mass concentrations of COD, TP and NH3-N decreased when the sediment was undisturbed, but increased when the flux increased to disturbed sediment. The preliminary results of the test will provide a technical support for the scientific regulation of water volume in the North canal to improve its water environment.