Study and Application of Different Water Quality Assessment Methods in the Section of Eastern Route of South-to-North Water Diversion Project
Taking 12 water quality monitoring sections of the eastern route of the South-to-North Water Diversion Project as the research object,according to the monitoring results of 9 indexes such as dissolved oxygen,permanganate index,ammonia nitrogen,total phosphorus,heavy metals(copper,zinc,lead and cadmium)and fecal coliform group,four water quality evaluation methods such as single factor evaluation method,Nemero index method,comprehensive water quality identification index method and fuzzy comprehensive matrix evaluation method are used to evaluate and analyze the water quality of 12 sections.The results show that the water quality of 12 sections is good.The water quality of Laoshan Township section(Lake and reservoir)is identified as class V using the single factor evaluation method,and the main exceeding factor is total phosphorus.The water quality of other sections was evaluated as Class Ⅲ or Class Ⅱ using either of the four methods.Compared with the other three methods,the single-factor evaluation method is simple to calculate,and the water quality category obtained is the worst overall due to its strict assessment standard.In the specific application practice,a more appropriate evaluation method should be adopted according to the evaluation purpose and section function,so as to provide a more objective basis for the environmental management of the South-to-North Water Diversion.
Surface waterSouth-to-North Water Transfer ProjectWater quality evaluationEvaluation methods
NETL
NSTL
万方数据
