| The Shenyang-Fushun section of the Hun River flows through the two major industrial cities of Shenyang and Fushun.With the continuous development of urbanization,the river system of the Shenyang-Fushun section of the Hun River gradually changes from a natural river to an inland river.With the increase of population and water consumption and sewage volume,the water quality in the mainstream of Shenyang-Fushun section of the Hun River is not optimistic.Some tributary water systems passing through the city have turned into sewage ditches.Especially in the dry season,the water quality is even worsened.In recent years,with the state's attention to the problem of river pollution,it is required that the river water quality be up to the deadline.Therefore,in view of the current situation of water quality in Shenyang-Fushun Section of Hun River Basin,it is urgent to carry out the technique of rapid improvement of river water quality,and the joint regulation and control of water quality and quantity is one of the quick and effective measures for achieving river water quality compliance.In this paper,aiming at the status of water pollution in rivers,a water quality and water quantity coupling model suitable for the Shenyang-Fushun River section of Hun River Basin was established.Based on this,a series of water quality and water regulation schemes were put forward and an optimal regulation scheme was determined.The main contents and conclusions of this paper are as follows:(1)On the basis of full investigation of Shenyang-Fushun Section of Hun River Basin,hydrological and water quality data were collected,collated and analyzed.Based on the one-dimensional Saint Venant equations,a one-dimensional hydrodynamic model with unsteady flow was established.Preissmann four-point eccentric implicit difference method was used to discretize and solve the equations.Based on the one-dimensional convection-diffusion equation,a one-dimensional water quality model of unsteady flow considering only COD and NH3-N degradation was established,and the model was discretized and solved by implicit difference method.Based on the established model of hydrodynamics and water quality,taking the water quality improvement degree as the minimum and the water demand as the objective function,taking the water balance,section water level and water supplement as the constraint conditions,the water quality of water in the Shenyang-Fushun Section of Hun River Basin Coupling model.(2)The daily flow rate and water level of sections of Fushun 2 and Shenyang 3 stations in 2013,2014 and 2015 in the "Liaohe River Basin hydrological data(Hun River and Taizi River water system)" were calibrated and verified by using the model.The measured water quality data of the five sections of Xiaboguan Barrage,Dongling Bridge,Wangjiawan Rubber Dam and Changqing Bridge in 2014,2015 and 2016 were used to calibrate and verify the water quality model.The results show that the absolute error between simulated value and measured value of cross-section water level is under 10 cm,relative error between simulated value and measured value of cross-section flow is below 5%,and the simulated values of COD and NH3-N concentration The relative error between the measured values below 10%.According to the simulation requirements of section flow,water level and pollutant concentration in the prediction standard of hydrological information GB22482-2008,there is a certain error between the simulated value and the measured value of the model,but it is within the allowable error range.(3)Taking into consideration of the status quo of discharge and current situation of the management of Dahuofang Reservoir,the water quality and water quantity coupled model was established to simulate the water quantity control based on the status quo of Dahuofang Reservoir,and the water regulation based on the sewage outfall And intercepted sewage outfall at the same time tributary water quality standards based on water regulation to the above three kinds of water regulation and control as a starting point to develop a series of water quality and water regulation program.The results showed that the joint regulation of water quality and water quality had a significant effect on the improvement of water quality,and the optimal control measures were as follows:cut off the sewage outfall and make the tributary water quality indicators meet the Grade V surface water requirements;at this time,The discharging flow of the reservoir is 20m3/s per day on average from October 1 to October 10,15 m3/s on average from October 11 to December 10,and 20m3 per day on average from December 11 to December 31/s;From January 1 to April 10,the average daily discharge of water is 15m3/s;from April 11 to April 30,the average daily discharge of water is 50m3/s. |
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