三峡工程库区巫山段干支流水质变化分析研究

文章采用巫山县环境监测站2002年到2008年监测资料，对三峡工程蓄水后库区巫山段水质进行了评价与分析。结果表明：蓄水后三峡库区长江干流巫山段总体水质良好；未受到重金属、石油类和挥发性酚类物质污染；总氮和总磷指标偏高；水体处于中营养状态水平。蓄水后一级支流总磷、总氮指标升高，水质类别上升，水质有恶化的趋势；水流变缓，气候条件和营养盐浓度适宜，在一级支流回水敏感区的部分河段爆发了“水华”，富营养化的潜在风险升高。在营养水平和气候条件相当的情况下，支流回水区常爆发“水华”而干流未出现“水华”现象，说明水动力条件是发生水体富营养化的主要诱发因子。

Analysis on Water Quality Variation of the Mainstream and Tributaries in Wushan Section, Three Gorges Reservoir Region

In this paper,an analysis was conducted for the water quality condition in the Wushan section in the Three Gorges Reservoir Region using monitoring data from 2002-2008.Results indicate that water quality in the mainstream is satisfactory in general,and is not polluted by heavy metals,petroleum pollutants and Volatile phenols.TN and TP have a higher concentration.Water quality condition in tributaries becomes deterioration during impoundment.Algae blooms appear in some areas under available hydrodynamic,clim...