Study On Flood Risk Analysis Model Optimization And Parameter Adaptability Of Flood Protected Zone

The intensification of soil and water loss and the acceleration of urbanization have posed great pressure to our new era of flood control and mitigation,therefore,the combination of non-engineering measures and engineering measures to change the flood management model,doing a good job on the flood control area of flood control risk management will be the inevitable requirement of flood prevention and mitigation.How to establish a high-accuracy and high-efficiency flood risk analysis model to simulate the flood elements in the region will be our future pursuit of goals and problems to be solved.Based on this,the flood risk analysis model is optimized and the parameter adaptability is studied according to the project of flood risk map of Zhangweixinhe River right bank flood control protected area.The main contents and conclusions are as follows:(1)Based on the analysis of two-dimensional hydrodynamic model theory,the model is optimized by taking the following optimized measures: concentrating grid in the key research area;generalizing linear objects and bridges reasonablely;Using satellite remote sensing to make the segmentation of Roughness;Optimizing the wet and dry boundary;Considering the actual soil infiltration loss.It can achieve the greatest unity for model refinement and high-efficiency.(2)Respectively,from the grid scale,roughness setting and linear features of three aspects of its adaptability,and then construct the multi-group plan to compare and analyze the simulation results: The grid scale affects the reliability of the model to a great extent.The reasonable grid scale can guarantee the model precision and take the model efficiency into consideration;the influence of roughness on the flood velocity is the largest,the second is on submerged depth and the least is flow regime.The rational subarea roughness can accurately and effectively simulate the flood evolution process.Through analyzing and comparing the influence of different height(0.2m?0.3m?0.4m?0.5m?0.6m)linear features on flood risk factors: flooding the larger magnitude of the case(P=2%?1%),the linear features above 0.5m above the ground have obvious influence on the flood evolution,and the water blocking effect must be taken into account in the model construction;flood level of the smaller cases(P=5%?10%),the water blocking effect of 0.4m above the ground should be taken into account.(3)Based on the flood risk model optimization and parameter adaptability analysis,a two-dimensional hydrodynamic model of the right bank embankment in Zhangweixin River was established.It can simulate the risk factors such as submerged depth,flood velocity and flow regime in the protected area.And through a comprehensive analysis of these factors,the flood protection area flood risk zoning,it can provide effective protection for the flood control decision-making departments to formulate corresponding policies and people's lives and property security.