江西抚河2010年唱凯堤溃堤洪水模拟反演分析

本文在中国水利水电科学研究院洪涝仿真模型（IWHR-FRAS）的基础上，针对溃堤洪水利用基于共轭离散单元的有限体积法求解考虑了水流惯性项和摩阻项的完全圣维南方程组，并建立江西抚河2010年唱凯堤溃堤洪水的模拟演算模型，进行了溃堤及洪水发展过程的模拟反演。结合溃堤后现场考察的实测资料，对反演结果进行了分析，结果表明：所建立的唱凯堤溃堤洪水模拟模型可以较好地模拟反演溃堤、修复及排水等因素影响下洪水的发展变化过程；计算的溃口流量过程与堤内外的水位变化过程相一致；溃堤后唱凯堤内的水量变化过程比较合理，与实际情况也相吻合；计算的洪痕处水深与现场观测到的洪痕水深值比较接近。模型基本能够模拟反演人工修复等因素影响下溃堤洪水的演进变化过程，可为溃堤发生后的防洪、抢险、救灾等工作的开展提供重要的技术参考。

Simulation and analysis of dam-break flood for Changkai dyke in Fuhe river of Jiangxi province

On the basis of flood and waterlogging simulation model (IWHR-FRAS) developed by China Institute of Water Resources and Hydropower Research, the full Saint-Venant Equations considering friction item and flow inertia item was solved by using the finite volume method based on Conjugate Discrete Mesh for dam-break flood. A flood simulation model of Changkai dyke that breached in 2010 is established,considering the development process of the flood for dam-break. The simulation results were analyzed on the basis of investigation data of Changkai dam-break. The results are:(1) the model established in this paper can be used to simulate the flood development process of the dam-break in consideration of the factors of dam-break,repairing and draining etc.;(2) the flow hydrograph of dam-break is consistent with the water level hydrographs inside and outside the dyke;(3) the water volume hydrograph of the Changkai dyke protection area calculated by the model is reasonable and consistent with the real situation;(4) Water depth simulated by the model is closed to the value observed in the flood marking position. It is concluded that the model established in this paper could be applied to provide an important technical reference for the jobs of flood control,emergency rescue and disaster relief,etc. after the dam-break.