Study on the Critical Surface Rainfall of Flash Floods at the South Foot of Daqingshan in Hohhot Based on F1oodArea Model
Taking the gully watershed at the south foot of Daqing Mountain in the north of Hohhot city as the study area,and based on the hourly precipitation data of national meteorological stations and regional meteorological stations in the basin,digital elevation model DEM data,and land use data,the flood dynamic inundation simulation and effect test were carried out for two rainstorm periods on July 12th,1998 and August 1st,2020,by using the FloodArea model.The results showed that the simulation results of the F1oodArea hydrodynamic model were in good agreement with the actual situation for the torrential rain process on July 12th,1998.The flood inundation with depth of 9 gullies in the basin had the best correlation with the accumulated 9-hour sliding surface rainfall,and the regression relationship equation between areal rainfall and submerged depth was constructed.Based on the three risk levels of hidden danger points,the critical rainfall at different levels were finally determined,taking the Hongshankou gully as an example,69.9 mm(grade 1),39.3 mm(grade 2),17.2 mm(grade 3),respectively.For the rainstorm process on August 1st,2020,the model simulation results were basically consistent with the torrential flood process,which also proved the applicability of the linear regression models,laying a foundation for the further establishment of the city's torrential flood disaster forecast service in the future.
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