Study On Sudden Water Pollution Simulation And Emergency Control Of The East Route Of South-to-North Water Transfer Project

Hongze lake is an important regulation and storage lake on the eastern route of the south-to-north water diversion and the largest plain reservoir in the middle and lower reaches of the Huaihe river.Because of its unique geographical location and engineering design,the hongze lake has become a comprehensive water shallow lakes,need both as multiple centralized at or above the county level of supply water source of drinking water and irrigation water,and the eastern route project of water diversion lake,also need to undertake including the Huaihe river,hong-he xu multiple streams of coming water and water.80%of its annual intake of 33 billion m3 comes from the main stream of the Huaihe river.However,water pollution accidents happen frequently in Huaihe river basin.When the main stream of Huaihe river carries a large amount of sewage into hongze lake,the ecology,water safety and engineering safety of hongze lake are affected to different degrees.Therefore,it is of great theoretical and practical significance to study the water movement and water quality changes after the main stream of Huaihe river carries pollutants into hongze lakeIn this paper,MIKE21 hydrodynamic and water quality coupling model is used to simulate and discuss the inflow and pollution of Huaihe river in different typical years.Model adopts 2007 lake measured depth contour vector files,each with the Xiao Liuxiang,Jin Suozhen flue station and indicates Gao Liangjian,Jiang Ba gage as fluctuation control the border of the measured values in the Huaihe river.Measured pollutant concentration distribution in the cross section of the Huaihe river bridge as the Huaihe river water quality control values.The changes of lake water level and concentrations of CODMn and ammonia nitrogen in 2016 were simulated.The measured values of the lake center hydrologic station and the water quality monitoring data provided by the annual management report are used as verification values.The results show that the simulation results are in good agreement with the measured values of the hydrologic station.This paper simulates the water movement and pollutant dispersion of the lake in July by calculating the water and water transfer conditions of the Huaihe River in different typical years,designing the concentration of different pollutants and the length of the lake.Under the four scenarios of Fengshui Year,the time of pollution at the outlet of Erhe Gate was 6d20.5h,6d20.5h,4d14.5h and 4d14.5h after the pollutants entered the lake,and the affected time was 4d3h and 8d16h respectively.8d8.5h and>17d;under the four scenarios of Pingshui Year,the water outlets of Scenario 1,Scenario 2 and Scenario 32 were not affected.The time when the water outlet of the Erhe Gate was affected was the time after the pollutants entered the lake.12d16h,the affected time is>17d.As of August 1,the outlet of the Erhe Gate is 8.3 mg/L,and the concentration is low.In dry years,the amount of water entering the lake is less than that in Pingshui Year,and the hydrodynamics are weaker.Therefore,this paper does not do simulation calculations.When the lake is subject to prolonged pollution,the pollution of the Erhe Gate lasts longer.When the lake is exposed to high-concentration pollution,the diffusion rate of pollutants is accelerated,and the time when the water outlet is affected by pollution is advanced,and the duration of pollution increases.At the same time,this paper combines the actual water conservancy project dispatching capacity,economic benefit and simulation results to reduce the concentration and duration of pollutants in the outlet of the Erhe Gate,and design the control plan for the most unfavorable scenario of the Fengshui Year,seeking optimal human control scheduling.Program.The results show that due to the small water transfer capacity of Jiangba Station,its scouring ability is poor,and it has no effect on the pollutant concentration at the outlet of Erhe Gate.By increasing the discharge flow of the Sanhe Gate,it is possible to effectively control the pollutants at the outlet of the Erhe Gate,so that the concentration of the pollution concentration is reduced and the duration of pollution is reduced.However,the concentration of pollutants at the Sanhe Gate will increase and the pollution time will be advanced.