Research On Flood Risk Analysis Based On One-dimensional And Two-dimensional Hydraulic Coupling Calculation Model

As is known to all, flood is one of the frequent natural disasters in China。Alongwith the economics of cities and flood storages rapid development，The flooddisasters loss increases day by day。Especially some cities，built along the rivers，when encounter river levee break, dyke break flood will bring enormous loss tohuman life and property. Establish mathematical model of river dyke break and dykebreak flood flooding evolution, and have flood risk analysis evaluation can evaluatethe project of flood control、Forecast flood inundation loss，also can provide thereliable digital basis for drawing the flood risk map.The main works in the paper can be summarized as following:(1) Flood riskanalysis calculation is the core and foundation of flood risk map compilation. Mainlyresearch on the risk of river dyke break flood. Establish channel and gradient dykebreaches coupled hydraulic model, According to the dyke breaches in flow levelhydraulic parameters, verified the model can better simulate the real inrushaccident.(2) Based on finite volume method without structure grid，establishtwo-dimensional mathematical model of flood evolution. According to the dykebreaches in flow water level, calculate the flood in the lower evolution situation. Inthe Model, according to various terrain conditions, such as railway、 embankment、highways and other buildings，The division of channel will be divided into differenttypes and corresponding different theory to calculate， corresponding to differentcode in the program。Through the numerical examples validate the model can simulatecomplicated engineering practical problems。(3)Caculate different frequency floodmet by Yongding River. Through the establishment of the Yongding River leftembankment flood evolution mathematical model, Simulate the situation of floodevolution in Beijing. According to the calculation results, evaluate the risk of flood.Then analysis the risk degree of disaster areas and whether population displacement isat the time.(4) State flood risk map drawing method、 drawing requirements、drawing steps and other related matters. Combine with the Yongding River flood riskanalysis results. Select the largest submerged depth as the research index, draw theYongding River left embankment flood risk map. The model established in this article can simulate the barrier bursts in the actualproject. The simulation can approximate the outburst process in reality, and thecalculation accuracy can meet the engineering requirements. The flood risk map ofYongding River drawn in this article, can provide a scientific basis for the correctdecisions, the analysis of the disaster and the disaster prevention and mitigation of theflood control department, and have greater practical significance.