Modeling of a compound flood induced by the levee breach at Qianbujing Creek, Shanghai, during Typhoon Fitow

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 October 2013. Heavy rainfall associated with typhoon intensified severity (extent and depth). This study investigates evolution understand dynamic nature compound effect using well-established 2D hydro-inundation model (FloodMap) reconstruct this typical event. coupled urban hydrological processes inundation for high-resolution modeling, which has been applied number different environments, FloodMap is now mainstream numerical simulation used scenarios. Our results provide comprehensive view spatial patterns evolution. The worst-hit areas are predicted be low-lying settlements farmland. Temporal evaluations suggest that most critical time prevention early 1–3 h after dike failure. In low-elevation areas, temporary drainage measures defenses equally important. validation demonstrates reliability approach.