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拉萨河城区中段防洪工程于2002—2006年分步实施,工程建成后,拉萨河城区段防洪标准从10 a一遇提高到100 a一遇。设计中通过采用北京市水利规划设计研究院自主开发的一维天然河道水面曲线计算程序进行水面线计算,弥补了二维水力学物理模型的不足,对拉萨河城区段流态及水面线等进行了研究,为工程设计提供了较为准确的水面线数据,并与物理模型相结合,二者取长补短,对太阳岛和仙足岛现状和规划工况下不同堤线等多方案进行比选,优化分析并论证了工程设计方案。
The flood control project in the middle section of Lhasa River City was implemented step by step in 2002-2006. After the completion of the project, the flood control standard in the Lhasa River section increased from 10 a to 100 a. In the design, waterline calculation is made by using the one-dimensional natural river surface curve calculation program independently developed by Beijing Water Resources Planning and Design Institute to make up for the shortage of the physical model of two-dimensional hydraulics, The research provides relatively accurate waterline data for engineering design and is combined with the physical model. Both of them complement and complement each other for the current situation of Sun Island and Xianzu Island and different embankments under planning conditions and optimize Analysis and demonstration of the project design.