To assess the potential risk of eutrophication in a landscape lake supplied by stormwater,this study focused on Tianjin Culture Park where two typical landscape lake systems,the stormwater collection system (stormwater passed through sedimentation manholes,storage modules,and vertical-flow constructed wetland)and the circulation and purification system (the lake water is pumped out into the wetland and back into the lake again),were analyzed,and the nutrients characteristics of the lake were determined.This research describes nutrients monitoring of the landscape lake from March to October 2015,with an analysis of the temporal characteristics and different forms of nitrogen and phosphorus for the lake,combined with natural and human factors extracted.The results indicated that from March to October 2015,the average concentrations of TN and TP in the lake were (1.551 ± 0.491) mg · L-1 and (0.058 ± 0.029) mg · L-1,respectively,and DTN and DTP accounted for 71.7％ and 50％.When the system was operating stably,the concentrations of TN and TP were between 1.0 to 1.3 mg · L-1 and 0.029 to 0.05 mg · L-1,respectively.Dissolved nitrogen was the main form of nitrogen,whereas particulate phosphorus was the main form of phosphorus,in the lake.During rainfall,some pollutants in the runoff washed into the lake,which resulted in an increased concentration of dissolved phosphorus.The wetland operating status was the main factor affecting TN and DTN concentrations,whereas TP and DTP concentrations were influenced mainly by rainfall.The risk of eutrophication in this urban lake is low,except during rainfall when dissolved phosphorus is a big risk factor for eutrophication.
stormwaterlandscape lakenitrogen and phosphoruswetlandeutrophication risk
国家科技期刊平台
NSTL
万方数据
维普
