Simulation Study On The Flow Rate Of River Cross Section Based On Flood Calculation Method

Flow is the most basic hydrological characteristic value of river,Which can reflect the law of river water change,and then serve the national economy and social stability.In recent years,with the rapid development of the development and utilization of water resources and water conservancy project construction,the change law of river flow and test conditions change,brought hydrological work a lot of influence,hydrologic test data,in order to complete the hydrologic work burden,reduce the hydrological station in the cross section of the test is very necessary to simulate the process flow.The realization of this process can check the data of the flow and reorganization of hydrologic station,and provide reference for similar hydrological stations.Therefore,this study has important practical significance.In this paper,the reach from Yaojiashan to ZhanBei as the research object.On the basis of analyzing and studying the method of flood calculation at home and abroad,the flow evolution model of the river section was established by using the method of Muskingum and MIKE 11 HD,respectively.The models are used to simulate the flow process of the test section of the lower reaches of the hydrologic station.The main research results are as follows:(1)Flow routing model based on Muskingum methodAccording to the daily average discharge data downstream of the YaoJiashan hydropower station and the daily average flow process of the test section of the zhanbei hydrological station,applying the grey correlation analysis method to obtain the traffic time as the corresponding day on the basis of the principle of water equation,at the same time,the optimal value are determined by the improved Muskingum method.Finally,the Muskingum model is established.The model is validated and applied respectively,and the flow process calculated by the model is compared with the measured flow rate.The analysis results show that the flow calculation model in the validation period and the simulation period is consistent well,simulation results of the prediction accuracy in grade B and above,which verify the reliability and feasibility of the model.At the same time,the simulation results are compared with the simulation results of the function relationship.The results show that the simulation results of the model are more accurate and more reliable than the traditional correlation,and can be applied to practical work prediction.(2)One dimensional hydrodynamic model based on MIKE 11 HD modelIn the same section,using the HD module of MIKE 11 software,MIKE Zero,ArcGIS and other tools to organize data,MIKE 11 HD is established.Through calculation and analysis to determine the main parameters affected the accuracy of the model-channel roughness value of n.Using the constructed MIKE 11 HD model to simulate the daily average flow rate and time flow rate time series flow process respectively,and compare with the measured flowrate.The results show that the calculation of the five values of the parameters are verified to meet the standard requirements,as the basic data for establishing MIKE 11 HD model of simulation model is reliable and reasonable,model simulation results are good.(3)Comparison and analysis of two modelsThrough the analysis of the Muskingum model and the MIKE 11 HD model comparison in simulation effect and applicability of the model,the results show that the two kinds of flow routing model can be applied to the study of the river,and the Muskingum model and MIKE11 HD model in the same time series flow process simulation accuracy is slightly lower than the latter.In addition,the MIKE11 HD model can also simulate the time flow process of non-equal time interval,which is more widely applicable than the former.However,MIKE 11 HD model has certain limitations in the application and promotion of areas lacking river cross-section shape data.