Study On Application Of River Regulation Scheme In Mountainous Area Based On MIKE21FM

In recent years,with the development of economy and the aggravation of extreme climate,the flood control awareness of residents near the river is weak,and the frequency of flood disasters in medium and small rivers is increasing.In the treatment of small and medium-sized rivers,it is necessary not only to meet the needs of flood control safety,but also to give full play to the river function,ensure the river health and protect the river ecological species diversity,abandon the traditional single channel treatment mode of "channelization,hardening and bleaching",and adopt the river flood control treatment scheme according to local conditions.At present,the research on river flood control planning mainly focuses on large rivers with rich hydrological data and topographic data and their related water related projects,while the research on small river basins in mountainous areas with lack of data and increasingly prominent flood control problems is less.River flood numerical simulation is an important technical method for river flood control management and early warning.At present,the river flood process simulation is mainly based on the hydrodynamic method of Saint Venant equation.This paper studies the hydrological process and hydrodynamic process mechanism of river flood,calculates the flood routing process of river by numerical simulation method,understands the flow situation of existing river by simulation results,and analyzes the flood control capacity of existing river,so as to predict the scope of flood disaster,so as to achieve the purpose of prevention.In this paper,Jiankou river is selected as the research object.Based on Reynolds average stress equation,mike21 fm hydrodynamic mathematical model is constructed to simulate and calculate the river flood routing process.By analyzing the river flood simulation results before treatment,the current flow capacity and flood control and waterlogging compliance of the river are understood,and the treatment planning and flood control impact are studied,Ensure the feasibility of flood control scheme.The main contents of the study are as follows1.The design flood hydrograph of the area without hydrological data is calculated,and sms11.2 is applied to divide the difference value and optimize the mesh of the riverway area coastline and terrain elevation XYZ data file.The irregular triangular mesh mesh terrain file is made,and the roughness,time step,initial condition,dry wet dynamic boundary and other related parameters are selected combined with the relevant data to construct Mike21 FM HD model is used to simulate flood routing.2.The traditional flood routing method is used to calculate the flood routing process,and HEC-RAS is used to simulate the river water conservancy,and the results are compared with the simulation results to analyze the rationality of the simulation results and verify the feasibility of mike21 fm flood simulation.3.Analysis of flood routing simulation results.Analyze the flood routing results of the original terrain River,draw the river inundation analysis map and count the inundation situation of the river.4.Flood control scheme planning.This paper analyzes the inundation situation of the river with a return period of 20 years,formulates a reasonable River flood control scheme,carries out flood numerical simulation analysis on the flood control scheme,compares the project investment between the flood control scheme and the traditional scheme,and puts forward a new method based on Mike21,which integrates the observation of river current problems,the exploration of flood routing,the design of flood control scheme,and the simulation verification of scheme design The new method is applied to the flood control project of flood routing river.5.Visualization of flood routing simulation results.Mike animator plus is used to display the flood routing in three dimensions and realize the dynamic visualization of flood routing.