EVALUATION OF BEHAVIOR OF FLOATING LITTER DURING FLOODING WITH LEVEE BREACH BY USING INUNDATION ANALYSIS

抄録

 Because of recent severe flooding events, numerous embankments have been breached, resulting in large amounts of floating litter in residential areas. Understanding the behavior of floating litter during flood events is crucially important. For this study, we improved the comprehensive flood analysis model to reflect drainage from sluiceways and pumps. Moreover, we considered a detailed flood analysis until the floodwaters of the urban area were drained. Furthermore, a simulation of floating litter movement was performed using flood analysis results. Results show that more than half of the floating litter generated in the urban area during flooding remains in the residential area, but about one-fifth of the litter flows out through the breached site and flows into the river. The proportion of litter flowing out is higher in areas closer to the breach locations. Additionally, around 13% of the litter accumulates at drainage gates.