桃林口水库下游山区洪水演进模拟和洪灾损失评估

Flood Routing Simulation and Flood Loss Assessment for Mountainous Area in the Downstream of Taolinkou Reservoir

以二维非恒定流控制方程为理论基础,采用有限体积法,建立了洪水演进数学模型。将改进的水量平衡模式应用于山区洪水演进计算,以解决单元虚假流动的问题;同时在考虑山区地形对洪水演进的影响条件下,以桃林口水库泄洪过程作为模型边界条件,对下游山区的淹没范围、淹没水深和流场进行了模拟;并结合青龙河两岸洪痕点实测值对模型进行了验证,模拟结果与实际情况基本吻合;最后以洪水演进为基础,对洪灾经济损失和生命损失进行了估算。该研究成果可为评价区域防洪影响提供必要的研究思路和方法。

In this article,a mathematical model of flood routing is established by finite volume method based on two-dimensional unsteady flow equations. An improved water balance model is applied to the flood routing calculation to solve the problem of false flow in the unit of mountainous area. According to the boundary condition determined by the flood process of Taolinkou reservoir,the submerged area,submerged depth and flow fields in thedownstream mountainous area are calculated in consideration of the influence of mountainous terrain on flood routing. Furthermore,the values of flood marks on the riverbank were adopted for model validation,and the simulation results are overall consistent with historical observed data. On the basis of flood routing simulation,the economic and life losses caused by flood disaster are estimated. The research result provides necessary ideas and methods for impact assessment of regional flood control.