Flood Risk Map Compilation Of The Flood Protection Area Of Left Bank Of Taizi River

Has the characteristics of high frequency and wide distribution in the flood disaster in China,has always been a disease in our very vitals of economic and social development.Because the flood control ability of our country can not meet the need of severe flood control situation at present,it is very helpful to draw up flood risk map and apply it to flood risk management practice,which is very helpful to improve the flood defense ability and reduce the loss caused by the flood.The compilation of flood risk map is an important foundation for the new idea of water treatment,the establishment of flood risk management system,and the management of flood risk,and also one of the country's forward-looking and strategic information infrastructure work.In this paper,based on the flood risk compilation project in Liaoning Province,the left bank flood protection area of the Taizi River in the key areas of Liaoning province is the research object.Through the collection,arrangement and analysis of the basic data,the thinking and the selection of the analysis methods of the risk map in the key areas of Liaoning province are determined,and the idea of the model construction is drawn up.In the course of the evolution of river flood,one dimensional unsteady flow model is used in river course calculation,and two dimensional model is used outside the river.The one-dimensional model is coupled with the two-dimensional model,and the diffusion process of the flood to the embankment outside the flood time is accurately simulated.The rationality of the generalization of the flood computation model is verified by determining the calculation parameters through the actual flood recurrence calculation.At the same time,a disaster statistics and loss assessment model has been established,and the flood impact of each program has been calculated and calculated.The analysis results show that:(1)the average duration of the 100 year ulceration flow is generally long,and there is usually a period of platform period.The main reason is that the standard of the super standard collapse of 100 years is the highest water level of 50 years,that is,the water level in the River is not the highest,because the flood peak has not yet arrived.When in the peak,high flow flood continued outflow from the breach.(2)the maximum flow rate of the tributary super standard outburst is similar to that of the main flow.At the same time,the downstream outburst of the tributary is affected by the main stream flood because of the tributary flood before the main flow.When the water level of the main flow exceeds the height of the outsole,the flood water is poured back to the location of the outburst,and the flood will spread to the protected area again.(3)the upper and lower reaches of the Taizi River show a tendency to increase from theupper reaches of the upper reaches of the village to the South taikou village,but the head water head difference is obvious.The maximum water head difference of the upper reaches of the village is about 1m,and the maximum water head of the downstream village of the South taikou village is up to 6m.By drawing flood risk map,we choose a reasonable route to avoid danger and provide effective data for flood prevention.