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本文利用水力学二维非恒定流计算分析了渭河下游洪水风险性，并划分了洪水风险区。洪水风险模拟系统反映了洪水演进过程、洪水淹没深度、洪水流速以及洪水流向。经应用效果良好。
This paper calculates and analyzes the flood risk in the lower Weihe River by using two-dimensional unsteady flow of hydraulics and divides the flood risk area. The flood risk simulation system reflects the evolution of the flood, the depth of flooding, the velocity of the flood and the direction of the flood. The application effect is good.