Suchergebnisse

Abstract. Levee-breach-induced flooding occurs occasionally but always
causes considerable losses. A serious flood event occurred due to the
collapse of a 15 m long levee section in Qianbujing Creek, Shanghai, China,
during Typhoon Fitow in October 2013. Heavy rainfall associated with the typhoon
intensified the flood severity (extent and depth). This study investigates
the flood evolution to understand the dynamic nature of flooding and the
compound effect using a well-established 2D hydro-inundation model
(FloodMap) to reconstruct this typical event. This model coupled urban
hydrological processes with flood inundation for high-resolution flood
modeling, which has been applied in a number of different environments, and
FloodMap is now the mainstream numerical simulation model used for flood
scenarios. Our simulation results provide a comprehensive view of the
spatial patterns of the flood evolution. The worst-hit areas are predicted
to be low-lying settlements and farmland. Temporal evaluations suggest that
the most critical time for flooding prevention is in the early
1–3 h after dike failure. In low-elevation areas,
temporary drainage measures and flood defenses are equally important. The
validation of the model demonstrates the reliability of the approach.