摘要
Abstract
The deterioration of urban water quality caused by the outfall discharge of pumping stations into rivers has become a key focus of water environment governance in cities,especially in moderate to light rain.To analyze the impact of existing pumping stations on river water quality during outfall discharge,a numerical model was used to analyze the deterioration and recovery process of river water quality under light rain(P=0.15a,0.25,0.5a,la).A resilience analysis method was used to construct a water quality resilience index to quantify the impact process of outfall discharge,providing a basis for formulating river water quality improvement strategies.The results showed that:1)under moderate to light rain,the water quality of the river was deteriorated by 1.49～2.11 times as high as that of Class V water after outfall discharge to the river,and the farthest impact range within one day was about 2.5 km;2)relying on the self-purification ability of the river,the recovery period of deteriorated water was less than 40 days,and the impact of outfall discharge was significant in terms of sustainability;and 3)when the hydrodynamic force of the river was accelerated,the recovery period of deteriorated water could be accelerated to 12 hours.The water quality resilience analysis method is a systematic and quantitative approach that provides new ideas for comprehensive evaluation on the effectiveness of measures such as source control and interception,end of pipe treatment,and smooth flow of running water.关键词
泵站放江/城市河道/耦合模拟/功能函数/水质弹性Key words
Outfall discharge of pump station/urban waterway/coupling simulation/functional function/water quality resilience分类
环境科学
