Development of parallelizable flood inundation models for large scale analysis

摘要: Flood disasters are a major cause of fatalities and economic losses, several studies indicate that global flood risk is currently increasing. In order to reduce mitigate the impact river disasters, current trend integrate existing structural defences with non measures. This calls for wider application advanced hydraulic models hazard mapping, engineering design, forecasting systems. Within this framework, two different large scale analysis events have been developed. The models, named CA2D IFD-GGA, adopt an integrated approach based on diffusive shallow water equations simplified finite volume scheme. also designed massive code parallelization, which has key importance in reducing run times high-detail applications. The were first applied numerical cases, test reliability accuracy model versions. Then, most effective versions real scenarios. The IFD-GGA showed serious problems prevented further applications. On contrary, proved be fast robust, able reproduce 1D 2D flow processes terms depth velocity. applications results was good adequate analysis. Where complex occurred local errors observed, due approximations. However, they did not compromise correct representation overall processes. In conclusion, CA can valuable tool simulation wide range event types, including lowland flash events.