Simulation Study On Total Amount And Control Of Pollutants In A River Channel Based On Mike Model

With the rapid development of social economy,water resources are being exploited and utilized wantonly,and the water ecological environment of rivers is deteriorating step by step,which leads to the water pollution problem becoming more and more prominent,the carrying capacity of water body is gradually weakened,and the water environment problem has become the bottleneck of regional economic development.Since 2018,the water quality of a river Trailer city in Hubei Province has not reached the standard for a long time.In the rectification plan of the river by the relevant environmental protection department of Hubei Province,it is clearly proposed that the water environment quality of the river should be improved.At present,the research focus of environmental research institutions at home and abroad is shifting to solve water environmental problems and control water pollution.Through the study of a river environment in Hubei Province,this paper reveals the impact of water environment problems on the sustainable development of the river basin,which is helpful to explore the sustainable development of the river basin.In this paper,through collecting the monitoring data of the monitoring points of the main trunk road and tributaries of the study river,the topographic and hydrological data of the river,the status of pollution sources in the basin,the distribution of sewage outlets and sewage enterprises,described the hydrological situation of the study river section,analyzed and evaluated the current water quality,and selected COD_Mn,ammonia nitrogen and total phosphorus as the pollution factors of the study river section.According to the collected data,combined with MIKE11 model,each component file of MIKE11 model（including boundary file,river network file,time series file,section file,HD module and ad module parameter file,etc.）is established,and the established component files are put into the simulation file,so as to establish the hydrodynamic water quality coupling model,and verify the MIKE11 model in the study river through the calibration parameters The applicability of the paragraph.The parameters usually calibrated include river bed roughness（Manning coefficient）and attenuation coefficient of pollution factor.After calibration,when the river bed roughness is 0.22,the discharge and water level simulated by MIKE11 are very close to the measured discharge and water level;when the attenuation coefficient of COD_Mn,ammonia nitrogen and total phosphorus in the study river reach are 0.071/d,0.052/d and0.048/d,the variation process line of pollution factor concentration simulated by MIKE 11model and the measured pollution factor concentration change The fitting of chemical process curve is good.In this paper,the MIKE11 model is used to calculate the water environmental capacity of the study river section,and the water environmental capacity is calculated to reduce the pollution load.According to the general survey of pollution in the study basin,the pollution sources are classified and the total amount of various pollution factors discharged into the study river section is calculated.Combined with the actual situation of the research basin,the relevant treatment measures are proposed for all kinds of pollution sources,so that the water quality of Tuoshi section is stable above the class III surface water standard.In addition,according to the situation that the water quality of Tuoshi section in the basin is not up to the standard,the ecological water supplement measures are put forward,and the water quality after water replenishment is simulated by Mike 11 model,the feasibility of ecological water supplement is verified,and the ecological water supplement amount is calculated.