福州市雨洪模拟

Numerical simulation of rainstorm flood in Fuzhou City

为把握城市洪涝风险的演变趋向,建立了可用于模拟福州城区雨洪产消过程的水力学模型。模型中平面水流的特性按二维非恒定流求解,小尺度河道水流的特性则按一维非恒定流求解。应用近年来重创福州的2次台风暴雨洪水的实测资料对模型进行调试和验证,结果表明模型具有良好的计算精度。模型可提供福州市洪水风险分析所需的洪水峰现时间、淹没范围、淹没水深、淹没历时等时空分布信息,为开展城市洪涝风险分析与评估、科学制定防汛应急预案、合理调度防洪工程体系提供先进有效的技术手段。

A hydraulic model for simulating the urban flood routing in Fuzhou City was established in order to know the evolution trend of the urban flood risk.The urban overland flows were treated as the two-dimensional unsteady ones,and the urban channel flows was regarded as the one-dimensional unsteady ones in the model.The model was calibrated and validated by means of the observed data of two sets of typhoon floods seriously hitting Fuzhou City in recent years.The results show that the proposed model has good accuracy.It can provide spatial and temporal information during the flooding including time to flood peak,extent of the inundated areas,water depth and inundation time for the urban risk analysis in Fuzhou City.It can also provide technical support for the urban flood risk analysis and assessment,emergency plan-making for flood prevention,dispatch of projects and facilities for flood control.