流量和含沙量对水质参数影响分析

Influence of water discharge and sediment concentration on water quality

为了研究近年来黄河下游水环境容量萎缩的内在机理 ,本文用流量级频率分析的方法 ,对 1982～ 1984年黄河下游花园口、泺口水文站实测水质分析成果表中的耗氧量、溶解氧及其相应流量进行了分析 ,得到在平滩流量下黄河下游河道对污染物输运能力最强 ,而且此时其水环境容量也最大的结论 .随着花园口、泺口水文站平滩流量由 195 8年的 80 0 0m3 s和 92 0 0m3 s降至 1999年的 40 0 0m3 s和 30 0 0m3 s ,黄河下游水环境容量萎缩是必然的 .本文又通过统计分析得知含沙量对黄河下游水质监测数据中的耗氧量及溶解氧量影响不大 .

The concept of effective contaminant-transport discharge based on frequency analysis method is established.The measurements of oxygen demand,dissolved oxygen and corresponding water discharge in downstream section of Yellow River show that the most effective discharge for contamination transport is bankfull discharge and environmental capacity will be maximum at this discharge.It is found that water environmental capacity will be reduced if the bankfull discharge becomes smaller.The statistics also shows no obvious relationship between sediment concentration and oxygen demand/dissolved oxygen is found.