水库排沙期间下泄水流水质与含沙量的相关关系

针对多泥沙水库实行人为排沙时含沙量的短时急剧变化可能对生态环境带来负面影响这一问题,以日本宇奈月水库和中国小浪底水库为研究对象,通过分析这2座水库排沙过程中含沙量与反映营养盐、耗氧污染物的水质指标之间的相关关系,得出了含沙量与各水质指标相关性良好的结论,并揭示了水库排沙期间含沙量对部分水质指标影响的拐点效应,可供我国今后制定兼顾排沙效率和生态环境保护的调水调沙方案提供参考。

Correlation between water quality and sediment concentration of releasing flows during sediment flushing of reservoirs

With regard to the negative impact of rapid change of sediment concentration in reservoirs on the eco-environment induced by artificial sediment flushing,the reservoirs in two famous rivers with much sediment concentration in China and Japan were selected as the case studies.The correlation between the sediment concentration and the water quality indices reflecting nutrition salt and oxygen-consuming pollutant for the two reservoirs during sediment flushing was analyzed.A conclusion is drawn that the relation between the sediment concentration and the water quality indices is satisfactory.The inflexion point effects of the sediment concentration on part of water quality indices during the sediment flushing of the reservoirs are revealed.It can provide references for the preparation of sediment flushing schemes considering the efficiency of sediment flushing and the protection of eco-environment.