南水北调中线工程渠首增调水对水质影响分析

Analysis on the influence of water transfer from the head of the Middle Route Project of South to North on water indicator

南水北调中线工程是世界上最大的引水工程之一,其渠首被誉为“天下第一渠首”。通过阐述南水北调中线工程渠首主要化学指标水环境质量状况,系统分析流量与水质之间响应关系。结果发现,渠首水环境质量处于较好水质状况,其中,高锰酸盐指数、叶绿素a以及藻密度3个指标呈现出较为明显的同源性,且由水质水量同步监测历史数据与增调水期间加密监测数据分析结果可知,流量的增加导致渠首高锰酸盐指数、叶绿素a以及藻密度浓度的上升。因此,建议在增调水期间持续关注3个指标浓度变化情况,必要时进行渠首底泥清淤作业,以保证供水区域用水安全与质量。研究结论对南水北调中线工程渠首调水实施方案具有一定的实践指导意义。

The Middle Route Project of South to north water diversion is one of the most magnificent water diversion projects in the world,and its canal head is known as“the first canal head in the world”.In this paper,the main chemical indicators of the head of the Middle Route Project of South to north water diversion are described,and the response relationship between flow and water quality is analyzed systematically.The results show that the head water quality is in a good level,among which the permanganate index,chlorophyll a and algae density show obvious homology,and are determined by the historical data of water quality and quantity monitoring,the results of intensive monitoring data analysis during the period of increasing water diversion show that the increase of flow leads to the increase of permanganate index,chlorophyll a and algae density concentration at the head of the canal.Therefore,it is suggested that attention should be paid to the concentration changes of the three indicators continuously during the period of increasing water diversion,and dredging operation should be carried out when necessary,so as to ensure the water safety and quality in the water supply area.The conclusion of this paper has a certain practical significance for the implementation scheme of Head work water transfer in the middle route of South to North Water Transfer Project.