Abstract
ABSTRACTThe torrential flooding and debris flow disasters associated with global climate change pose not only serious threat to individual lives and property, but also impact economic development. Accurately simulating flood scenarios can help to reduce the losses caused by torrential flooding and debris flow by making early warning, evacuation planning, and risk analysis possible. In this study, HEC-RAS software and HEC-GeoRAS module were employed in GIS (geographic information system) to simulate the flood overtopping in the Mengzong Gully of Batang River in flood scenarios occurring once in 20, 50, and 100 years, respectively. The simulated floods provided valuable information including scope and depth of submersion via 2D visualization.
Highlights
Among the many types of natural disasters, torrential flooding is relatively common and has farreaching impact on human society even in developed countries possessing high-tech disaster response capability (Ye et al 1999)
We developed the proposed torrential flood and debris-flow model by integrating GIS with the HEC’s River Analysis System (HEC-RAS) river hydraulic model and HEC-GeoRAS model
(1) Mengzong Gully, Yushu County, Qinghai province was used as an example to conduct HECRAS simulations of different flood discharges with HEC-GeoRAS
Summary
Among the many types of natural disasters, torrential flooding is relatively common and has farreaching impact on human society even in developed countries possessing high-tech disaster response capability (Ye et al 1999). Apart from the necessary, basic construction (e.g. levees) implemented to minimize flood damage, it is imperative to create and maintain a national system to provide both risk assessment and early warning for flood disasters to mitigate their potential damage. Within these systems, accurately simulating overtopping in potential submerged areas is key component (Xiu et al 2011). Map-to-Map methodology has proven successful at predicting flood severity at the local basin scale, but until now has not been applied to any high elevation area nor regional scale model. We attempted to create a floodplain output that will enable researchers to efficiently and accurately model rainfall-runoff relations, and hope our results contribute to Yushu residents’ ability to respond quickly to flooding events
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