HEC-RAS软件在珠江三角洲河道溃堤洪水模拟中的应用

摘要

The River Delta one-dimensional unsteady flow model is constructed by using HEC-RAS software , and the model with Lateral Structure Breach is used to simulate Luogewei levee break process in Foshan City , around Huyong parking lot.The model simulation can get the discharge process of breach ,the water level of the river and the water level with different breach width and the repair time.The results show that the breach width is an important factor to influence the design water level.When the breach width reaches a certain value ,the design water level will tend to be stable.The levee break model based on HEC-RAS can simulate the levee break process combining with the local emergency flood fighting ,and it can provide a reliable technical sup-port for the design of parking lot located in the Zhu River Delta dike.%运用HEC-RAS软件构建珠江三角洲一维河网非稳定流水动力模型，利用该模型与侧向水工结构溃坝模块（Lateral Structure Breach），进行湖涌停车场所在佛山市罗格围的溃堤模拟计算。得到不同溃口宽度、溃口修复时间等条件下溃口处的流量过程、外江水位过程、围内水位过程。实例结果表明，溃口宽度是影响围内设计水位的重要因素，当溃口宽度达某一值时，围内设计水位将趋于稳定。基于HEC-RAS的溃堤模型可与当地防汛抢险相结合进行溃堤影响分析，可为珠江三角洲堤围内停车场设计提供可靠的技术支持，供借鉴。