Simulation Research On Huashan Lake Water Environment Based On MIKE21

As a landscape water body,Huashan Lake is not only an important ecological wetland in the planning of Huashan Area,but also an important flood detention area for urban flood control.Due to the lack of connection between Huashan Lake and natural water bodies,there is no complete water intake and drainage system,resulting in the overall fluidity of the water body Poor,strong closure,long exchange cycle.This paper chooses MIKE21 software to simulate the hydrodynamics and water quality of Huashan Lake,explore the water flow and water quality change rules of Huashan Lake,simulate and analyze the impact of reclaimed water on the water quality of Huashan Lake,and in high temperature weather,low temperature weather,adding flow devices and Changes in hydrodynamic force and water quality under the scheme of connecting the northern part of Huashan Lake,and accordingly put forward improvement measures for the Huashan Lake area.The hydrodynamic model of Huashan Lake and the water quality model of ECO Lab were respectively established,and the simulation results were verified and analyzed.By collecting basic data such as terrain,wind field,rainfall and evaporation in the research area of Huashan Lake,a complete hydrodynamic model was established,and parameters were calibrated and model verified.Finally,the water level and flow velocity of Huashan Lake were obtained.Changes in the hydrodynamic field.On the basis of the constructed hydrodynamic model,after inputting the original lake water quality data and boundary water quality data,calibrating the water quality parameters and verifying the model,the Huashan Lake water quality model was constructed.The simulation results showed that the actual measured values were basically consistent with the predicted values.The changes of 5 main water quality factors including COD,ammonia nitrogen,nitrate nitrogen,total nitrogen and total phosphorus were analyzed.The water quality model can more accurately simulate the change of Huashan Lake water quality within the allowable error range.Based on this simulation,we can analyze and predict the change trend of the water quality of Huashan Lake,which plays an important role in predicting the water environment governance in the Huashan Lake area.Based on the current water quality of Huashan Lake,considering the impact of seasonal changes on the water self-purification capacity of the Huashan Lake ecosystem,the water quality changes under high temperature in summer and low temperature in winter were designed and simulated,and the following conclusions were drawn: When the temperature is high in summer,the concentration of all pollutants is low,and the water quality is far higher than the Class III water standard of the surface water environmental quality standard.When the temperature is low in winter,the concentration of pollutants increases,and the concentration of total phosphorus tends to increase,but the water quality can basically meet the Class III water standard of the surface water environmental quality standard.Combining the hydrodynamic and water quality simulation results of the Huashan Lake area,starting from improving the hydrodynamic conditions of the water body,two solutions were proposed.Using the hydrodynamic and water quality models established above,the water flow conditions and the distribution and degradation of pollutants in Huashan Lake were explored.When artificial disturbance measures are added in the lake area,the hydrodynamic conditions of the lake are strengthened,the water quality conditions are also improved,and the concentration distribution in the entire lake area tends to be even.After connecting the water bodies in the northern area of Huashan Lake,the entire lake can form a complete water cycle,which accelerates the flow of water bodies and reduces the accumulation of pollutants.The pollutants in the east lake area are driven by the water flow to the west lake area,and the overall pollution Biodegradability is improved.