Analysis of Flood Risk in Temporary Flood Storage and Detention area of Feilaixia Reservoir Area

This paper takes Felaixia Reservoir as the research object.In order to study the impact of different flood types and frequencies on inundation of temporary storage and detention area,one dimensional,two dimensional and hydraulics coupling models were constructed. The model parameters were calibrated by using two annual floods of“62·8”and“82·5”,and the measured data of two historical floods in July2006 and June 2008 were used to verify the model.After calibration and verification,a total of eight different working conditions were designed based on two typical floods of“62·8”and“82·5”,which were 300,200,100,50 years in recurrence interval. The highest water level of typical sections along the river,inundated area of flood storage and detention area and the arrival time of the flood peak were counted. The population and housing survey data on DOM and DEM superimposed graph were used to analyze the submergence risk of four temporary and detention areas.The results show that the temporary flood storage and detention area will suffer different degrees of inundation,when the Feilaixia reservoir is defending against a flood in more than 50 years.Therefore,it is urgent to strengthen engineering and non-engineering measures to reduce flood disaster risk.