Causes of water pollution from Guishui River to Guanting Reservoir and assessment of loads reduction measures
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Abstract:
The pollution prevention measures are developed based on the causal analysis to improve the water quality of the Winter Olympic Games,to ensure the inflow water quality into Guanting Reservoir (GTR),and to meet the water functional criterion.The water quality of rivers,lakes,and reservoirs is managed delicately. A 2dimensional model MIKE21 coupling with a "nutrients + vegetation" Ecolab module is used to compute the water quality in the downstream of Guishui River (GSR) from Dongdaqiao station to GTR,as well as the tribute of Sanli River (SLR).The pollution load of the main water quality factors on the water quality is analyzed,the phased measures are put forward,and the effect is evaluated. [JP2]The water quality responses by pollution sources,selfpurification ability,wetland vegetation effects,and flow rates change in flood and dry season are the main factors affecting the inflow of GTR.The monitoring data and simulation results in flood and dry periods show that the contribution rate of GSR inflow is large,and ammonia nitrogen,total phosphorus,and total nitrogen contribution rates from GSR inflow to GTR are 18.32%[KG-*5]–[KG-*6]45.76%,9.31%[KG-*5]–[KG-*6]31.17%,and 29.34%[KG-*5]–[KG-*6]67.56%,respectively.The reduction rates of ammonia nitrogen,total phosphorus,and total nitrogen are 44.85%[KG-*5]–[KG-*6]61.29%,51.40%[KG-*5]–[KG-*6]77.92%,and 8.40%[KG-*5]–[KG-*6]23.06%,respectively,in flood season including wetland vegetation action and dry season.Considering the serious water quality problems in the wet season,the construction of riparian wetland and the implementation of sewage interception measures are integrated.The simulation results show that dissolved oxygen,ammonia nitrogen,total phosphorus,and total nitrogen of Guishui River entering Guanting Reservoir are 7.23 mg/L,0.27 mg/L,0.03 mg/L,and 0.62 mg/L,respectively, which reach the class III water quality standard of surface water environment.The dissolved oxygen concentration increases by 2.99%,and the ammonia nitrogen,total phosphorus and total nitrogen concentrations decrease by 19.41%,31.31% and 24.94%,respectively.[JP] The key measures to improve the inflow water quality of GTR and keep good statutes stable are based on comprehensive management of river basin to ensure good water quality at control sections and shutting down the sewage inlet in urban river sections.Meanwhile,rehabilitation of riparian wetlands is helpful to water quality improvement.
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