闽江下游河道排污口设置的水质响应分析

Analysis on the response of sewage outfalls to the water quality of lower reaches of Minjiang River

建立了闽江下游河道一维动态水质模型,探讨了北港不同排污口设置方案对南、北港分汊河道水质的影响.结果表明,北港排污不仅影响排污口附近及北港河道的水质,还影响到南港河道;两个排污口组合设置下的水质好于单个污染源设置情况;污染物浓度过程呈现周期性的变化,排污口河段以上断面,涨潮时污染物浓度增高,落潮时污染物浓度降低,排污口河段以下断面的则相反.

One-dimensional dynamic water quality model in down stream of Minjiang River is developed. The influence of different setting schemes of sewage ouffalls on the water quality of North and South Channel is studied using the verified model. The result indicates that pollutant from North Channel affect not only the water quality of itself but also that of South Channel. Water quality is better when setting two sewage outfalls together than a single one and it varies periodically. In the reach upwards the sewage ouffalls the pollutant concentration increases during the flood tide and decreases during the ebb tide. However, it behaviors oppositely in reaches downwards the sewage outfalls.