Combined scenario flood risk analysis based on MikeFlood

During the flooding o f simulated rivers, the same2frequency rainsto rm combination scenario of the ma in str eam and tributary cannot r easo nably reflect the real o verflow situat ion. In view of this defect, considering the difference of actua l pr ecipi2 tat ion conditions bet ween the main stream and tributar y during the flo oding , w e est ablished a MikeFlood coupled hydro dy namic model based on floo ding scenario s of different fr equency combinatio ns of t he main str eam and tributar y. I n this paper, the typical hilly landform area, Xiushui, was taken as the research object. We simulated the 24 combinations in w hich the main stream and the main tributaries r espectively had 202, 502 and 1002year r ainstorms. We compar ed several scenario s w ith the ty pical st orm scenario s in which the ma in str eam and tribut aries had rainsto rms o f the same frequency. The compariso n results show ed t hat the selected combination scenarios pr esented much different distribution and size o f submer ged dept h than the t ypical scenarios. They can div ersely reflect the o verflow situation in the flood, pro viding

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