Research On Dandong City Flood Control Risk Analysis Based On Hydraulic Model

Flood is one of the natural disasters which occur in our country frequently,which has great harm to people's lives and property,and restricts the development of social economy.With the development of economic and the expansion of urban,especially along the Yangtze River and the construction of cities to speed up the process of urbanization,after the formation of the river dike dam break flood caused inundation loss and influence scope is also increasing.So it is very necessary to take measures of flood control and disaster reduction to resist flood and reduce flood losses.As an important means of flood management,flood risk management can not be separated from the accurate calculation of flood routing process.Based on the mathematical model of flood routing in river flood of simulation and analysis provide a reliable scientific basis for drawing flood risk map,it is the basic work of flood risk management,has a strong theoretical and practical significance.The flood routing calculation method of hydrology and hydraulics law.With the popularization of computer technology,hydraulic method obtained rapid development,the advantages are obvious.In this paper,the numerical simulation of flood routing is carried out by using the hydraulics method.The main research contents of this paper are:With development of the Danish Hydraulic Institute DHI Mike series software,according to research in the area of the river cross-section data,surface elevation data,land use data established MIKE11 one-dimensional model of river,Mike21 2D urban surface runoff model,Mike flood a two-dimensional coupled model and rivers of different frequency of design flood water process line and measured flood water surface profile data of model construction of rate parameters calibration and validation to prove the rationality of the model.Breach are selected according to the "best possible","the worst" principle,respectively with different frequency of design flood composition different flood calculation scheme,the flood analysis model is established to simulate the scheme.For flood simulation schemes under different conditions of flood inundation area,water depth,the breach flow elements of the extraction process,the rationality of the analysis.The simulation results can provide a scientific basis for the relevant government departments to take measures to provide scientific basis for flood control and disaster reduction.The rationality of the results shows that the simulation results can provide a scientific basis for the government departments to take measures to provide scientific basis for flood control and disaster reduction.