中文摘要：

为研究水库建成运行引起的水文情势变化对库区水质的影响,为工程的环境影响评价、环境保护对策措施的拟定等提供科学依据,采用湖库完全混合衰减模型对拟建的桐梓水库库区COD、BOD5浓度进行预测,并采用Dillon模型进行库区富营养化趋势预测。经计算,预测水平年库区枯水期COD、BOD5浓度分别为2.85、2.23mg/L,平水期分别为2.22、1.62mg/L,TP、TN浓度预测值分别为0.06、1.01mg/L。采用综合营养状态指数法分析得到水库将处于轻度富营养状态。为此,针对性提出了基于库区水质保护的水环境保护措施建议。

英文摘要：

In order to study the influence of changes of flow regime caused by the building and running of the reservoir on the reservoir water quality,a scientific basis for environmental impact assessment of the project is provided,the environmental protection countermeasures are prepared and so in,this paper the concentration of COD,BOD is forecast in the proposed Tongzi reservoir area is predicted by using the lake or reservoir completely mixed attenuation model,and Dillon model is used in.the eutrophication trend of the reservoir area.The calculation shows that the concentration of COD and BOD5 is 2.85mg/L and 2.23mg/L in low-flow period,2.22mg/L and 1.62mg/L in mean-flow period in 2020.However,the concentration of TP,TN is 0.06mg/L,1.01mg/L.By analyzing the data with the aggregative nutritional status index method,we know the reservoir is in the mild eutrophic.To this end,the paper proposes water environment protection measures based on the reservoir water quality protection.