Characterization and simulation of ′Niebert′ typhoon rain and flood in Meixi River basin

The typhoon storm has the characteristics of high intensity and concentrated rainfall.It is easy to form local destructive flood disasters in the middle and small sized watersheds of coastal areas.The distributed hydrological model based on high resolution topographic and geomorphic data is an effective way to forecast flood in small and medium sized basins.The Meixi River Basin in Minqing County of Fujian Province was selected as out study region.The China Flash Flood Model (CNFF-HM),based on the high resolution DEM,soil data,and land use data,was used to build the distributed hydrological model of the Meixi Basin.Fifty six hydrological events were used to calibrate and validate the model.The flood caused by the 'Niebert' typhoon,which occurred on 9 July 2016,was simulated. The result showed the model performance was good with a less than 20% error for flood peak flow,and a Nash Sutcliffe efficiency coefficient (NSE) of 0-96.Thus the model can reflect the flood characteristics caused by short-term heavy rainfall in the basin,and provide reliable technical support for disaster prevention and reduction in the basin.

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