Abstract: The effect of the construction of Three Gorges project on the water quality in the reservoir have and will have attracted widely many experts’ interests from abroad and inland. It is important to carry on the observation and evaluation for the water quality in Three Gorges Reach. The changes of the water flows and quality along the Yangtze River in the reservoir during two representative observation phases were introduced. And the gray relation model was used to evaluate the water quality of fou...

Key words: Three Gorges reach, water quality evaluation, the gray relation model, synchronous observation

摘要： 三峡大坝蓄水后对库区水质的影响一直是国内外广泛关注的问题，对三峡库区河段的水质监测与评价分析 无疑是十分重要的。笔者介绍了三峡库区河段水流水质在两次同步观测时段的沿程变化情况，并利用灰关联分析 方法对4个重点断面的洪水期和枯水期的水质进行评价分析，结论认为洪水期的水质偏差。认为在三峡大坝蓄水 后，由于水位抬高，流速减少，大量泥沙淤积在库区内，将可能引起二次污染，应及早研究防范措施。

关键词: 三峡库区, 水质评价, 灰关联分析, 同步观测