Development and application of two-dimensional unsteady flood routing model

The trend of two-dimensional flood routing modelling research is briefly analyzed.Based on the 20 m DEM data and observed discharge of Yanqi River,the flood-inundation under the designed flood frequency of the downstream channel is simulated herein with the two-dimensional unsteady flood-routing model.Furthermore,the simulated result is validated with Nash-Sutcliffe coefficient,and then,the simulated area,flood depth and land-inundation are analyzed as well.The result shows that the result is reliable with the error of the simulated flood depth of about 0.235 m,and the Nash-Sutcliffe coefficient of 0.78.The model can not only be applied to draw the flood risk map,but can also provide a strong technical support for the flooded area management,flood disaster assessment etc.