三峡库区河段水质同步观测与联合评价

Synchronous observation and evaluation for the water quality in Three Gorges reach

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.

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 four chief sections during the flood and low water representative observation phases. The results show that the water quality during the flood phase is worse than the one during the low water phase. It was concluded that lots of sediment will deposit in the reservoir and the twice pollution will be caused since the water level will be raised and the flow velocity will descend after the sluice of Three Gorges project. It is suggest that the preserve measures must be researched and applied.