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Numerical Simulation of Flood Inundation and Sedimentation Considering the Effects of Paddy Fields

Author(s): Kenji Kawaike, Masakazu Hashimoto, Hajime Nakagawa

Linked Author(s): Kenji Kawaike

Keywords: Flood inundation, sedimentation, paddy field, ridge, irrigation channel

Abstract: We numerically simulated the Kinu River flood inundation at Joso City in 2015. In the inundated areas, sedimentation in the paddy fields and their irrigation channels was a serious problem. In our simulation, we tried to reproduce the flood inundation flow and its attendant sedimentation in the study area. In order to consider the ridges and irrigation channels of the paddy fields, models of the vertical walls and one-dimensional network of the channels were incorporated in the two-dimensional inundation flow model. The maximum water level in the simulation agreed well with the measured value, and approximately 50 cm thick sedimentation deposits were observed on the overland and irrigation channels around the overflow and dike breach points, which might have caused severe damage to rice crops in the paddy fields and the drainage function of the irrigation channel


Year: 2017

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