Author(s): Masakazu Hashimoto, Kenji Kawaike, Yuji Hasegawa, Tomonori Deguchi, Shammi Haque, Arpan Paul, Mashfiqus Salehin, Hajime Nakagawa
Linked Author(s): Masakazu Hashimoto
Keywords: Un-gauged basin, riverbed aggradations, flash flood, flooding analysis, runoff analysis
Abstract: This study focuses on the effect of riverbed aggradations on the scale of flood inundation. Using a distributed runoff model of one-dimensional riverbed variation calculations and a two-dimensional flood inundation models, a flooding analysis for a flash flood in an un-gauged basin are performed. Due to the limitations of the available datasets, we first performed riverbed variation calculations by using daily discharge and water level data that were collected during April�Sept 2000. Next, we performed a runoff analysis by using 3-hourly satellite rainfall data that were observed during April�May 2006. Finally, riverbed data and discharge data are considered in the flash flood inundation analysis. The results show that after the riverbed aggradations was considered, the flood area becomes 2 times larger than that for the case where riverbed aggradations was not considered. Thus, we recommend considering riverbed aggradations in flash flood risk assessments
Year: 2017