三峡水库试验性蓄水期间水环境质量监测分析

为了分析三峡水库蓄水后的水体质量变化情况，选取水库干流全程和主要支流典型断面进行了水质监测。水库蓄水期间水质分析的结果表明：库区干流水质较好且总体稳定，但支流水质总体较差，支流回水区各断面水质以Ⅳ类为主，主要超标因子为总磷，与蓄水前相比，支流水质明显下降，大部分处于中营养或富营养状况，部分支流回水区的局部河段发生了水华。水质分析结果为针对性地制定三峡水库水环境保护措施奠定了基础。

Analysis of water environment quality during trial impoundment of Three Gorges Reservoir

In order to analyze the water environment quality of the Three Gorges Reservoir during its trial impoundment,water quality monitoring had been conducted at the selected typical cross-sections along the main stem and main tributaries.The results show that the water quality of the main stem in the reservoir area is generally in a good and stable state,but the water quality of tributaries is generally poorer;the water quality of each cross-section in the backwater zones of tributaries is generally classified as IV and the main over-standard pollutant factor is TP;compared with that before impoundment,the water quality of tributaries is obviously deteriorated and most water bodies are in mesotrophication or eutrophication and algal bloom appears in the local reaches in backwater zones of tributaries.The water quality analysis results provide a basis for making targeted water environmental protection measures of Three Gorges Reservoir.