Research On Changhe River Water Environment Simulation And Pollution Control Based On MIKE11

In recent years,the worsening trend of water pollution in China has not been fundamentally reversed,and the situation of river water environment governance is still very severe,which severely restricts the healthy development of society and economy and affects the normal production and life of human beings.In view of this,this article takes the typical rivers in the Chao lake Basin as an example.Based on environmental statistics and a series of water environment numerical simulation methods,the river channels under different hydrological conditions are reproduced.The evolution process of hydrodynamic water quality reveals the water environment response and pollution mechanism between river water bodies and land areas,and proposes management strategies for"enhancement capacity and emission reduction"of water environment based on water environment capacity,which provides science for river water environment issues s solution.The main work and conclusions of this thesis are as follows:?1?Through field investigation and literature review,the main problems of current water environment and domestic water environment governance process were sorted out.The existing water environment research methods,research trends,and surface water environment simulation research status were analyzed,and the physical geography,socioeconomics of the Changhe River Basin were combined.The surface water functional area and the water environment management requirements of the Chaohu Lake water system have determined the water quality standard requirements for the Changhe River Basin.The status of pollution sources and water quality conditions have been investigated and analyzed,and the main problems existing in the regional water environment have been identified.?2?Combined with the existing water environment simulation and calculation theory,based on the MIKE11 computing platform,a water environment simulation technology system integrating non-point sources in the land area and the water environment of the river was planned,and the hydrometeorology,land use,watershed and river terrain of the Changhe River Basin,and Pollution source survey data,a long-river hydrological,hydrodynamic and water quality coupled water environment model was constructed;it was verified that the simulated values and measured values of river water volume and water quality achieved a good fitting effect,and the simulated values of river flow and measured values were relatively average The error RE is 8.38%,the Ens coefficient is 0.91,and the simulation efficiency is excellent.The correlation coefficient between the simulated value of NH3-N and the measured value is 0.95,and the correlation coefficient between the simulated value of TP and the measured value is 0.98.The simulated value is higher than the measured value.The comprehensive degree shows that this water environment model has strong applicability.?3?Based on the above-mentioned water environment system model,the daily rainfall data in the past 60 years were selected.Three types of industrial processes,which are typical high water years?P=25%?,flat water years?P=50%?,and dry levels?P=75%?,were used in the Changhe River Basin.In this paper,the pollution load and spatiotemporal distribution of pollutants in the river basin at typical levels are simulated and analyzed,and the hydrodynamic water quality evolution process of the river under different hydrological conditions is reproduced.Water environment pollution mechanism.The results show that the typical NH₃-N river pollution load in river basins at typical high,flat and dry levels is 88.23t,42.81t,and 35.45t,and the TP river pollution load is 7.53t,3.65t,and 3.24t.September)The leading factor of river water environmental pollution is non-point source.The non-flood season?10?February?the main factor of river water environmental pollution is point source.Rainfall runoff is the main driver of nitrogen and phosphorus load loss.During the year,the load showed approximately the same trend as rainfall.?4?Taking the upper limit value of the corresponding environmental quality standard category of the water environment function zone as the target value of water quality,determine the water quality monitoring section of the area,and calculate the most disadvantageous water environment in combination with the typical river annual pollutant discharge and water quality solution.Horizontal year-typical dry year?P=75%?Water environmental capacity in flood and non-flood seasons.Calculations show that the water environmental capacities of NH₃-N and TP in typical dry seasons?March to September?are 3.36t/a and 1.20t/a,respectively.The environmental capacity is relatively small,respectively 0.83t/a and 0.31t/a.In general,the water environment capacity of the rivers in the Changhe River Basin is relatively small.With the acceleration of socio-economic development and urbanization,the Changhe River Basin is bound to face the pressure to accept pollution and increase capacity.Therefore,this work considers the current sewage discharge pattern,Pollution source controllability,technical feasibility,and other factors have been proposed for water environment capacity reduction and emission reduction strategies such as long-range pollution reduction and emission reduction,optimal allocation of water resources,and water ecological environment restoration.