2011年9月渭河流域受强降雨的影响,魏家堡至华县区间形成了3次较大的洪水过程,其中华县站出现了自1981年以来的最大洪峰。文章分析了渭河“2011·09”典型洪水的来源、水沙特性、河道冲淤变化和洪水演进的规律,为今后做好渭河下游洪水预报、防汛决策和指导洪水测报提供依据。 In September 2011, due to the heavy rainfall in the Weihe River basin, three large flood processes were formed in the Weijiapu-Huaxian section, of which Huaxian Station had the largest flood peak since 1981. The article analyzes the source, water and sediment characteristics, the change of river scouring and silting, and the evolution of flood in the Weihe River from “2011 · 09”, so as to provide basis for flood forecasting, flood control decision-making and guiding flood forecasting in the lower Weihe River in the future.